/* ============================================
   Weave Lab - 智能体验与服务工程实验室
   Global Stylesheet
   极简黑白高级风格
   ============================================ */

/* ---------- CSS Variables (Dark Theme) ---------- */
:root {
  --color-black: #000000;
  --color-white: #ffffff;
  --color-dark: #0a0a0a;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;

  --bg-primary: #0a0812;
  --bg-secondary: #12101c;
  --text-primary: #f5f5f5;
  --text-secondary: #a3a3a3;
  --text-tertiary: #737373;
  --border-color: #252235;
  --card-bg: #161324;
  --card-border: #252235;
  --nav-bg: rgba(10, 8, 18, 0.92);
  --nav-text: #f5f5f5;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  --max-width: 1440px;
  --max-width-narrow: 1200px;
  --nav-height: 80px;
  --section-padding: 120px 0;
  --section-padding-mobile: 80px 0;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

/* Dark theme for homepage - now same as root */
body.theme-dark {
  --bg-primary: #0a0812;
  --bg-secondary: #12101c;
  --text-primary: #f5f5f5;
  --text-secondary: #a3a3a3;
  --border-color: #252235;
  --card-bg: #161324;
  --card-border: #252235;
  --nav-bg: rgba(10, 8, 18, 0.92);
  --nav-text: #f5f5f5;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

/* ---------- Light Theme ---------- */
body.theme-light {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --text-primary: #000000;
  --text-secondary: #525252;
  --border-color: #e5e5e5;
  --card-bg: #ffffff;
  --card-border: #e5e5e5;
  --nav-bg: rgba(255, 255, 255, 0.92);
  --nav-text: #000000;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-weight: 400;
  transition: background-color var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
  position: relative;
}

/* Dark mode ambient glow - 深色模式全局紫蓝色柔光（与导师3D卡片风格一致） */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 1;
  transition: opacity var(--transition-slow);
  background:
    radial-gradient(circle at 15% 20%, rgba(79, 107, 255, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 85% 70%, rgba(155, 92, 255, 0.18) 0%, transparent 50%),
    radial-gradient(circle at 50% 100%, rgba(126, 107, 242, 0.12) 0%, transparent 55%);
  filter: blur(70px);
}
body.theme-light::before {
  opacity: 0;
}

body.theme-light::before {
  opacity: 0;
}

/* Make sure all content sits above the glow */
body > * {
  position: relative;
  z-index: 1;
}

/* 深色模式下各区块背景透明，让全局柔光透出来
   注意：只在深色模式（默认）下透明，亮色模式下保持白底 */
body:not(.theme-light) .section,
body:not(.theme-light) .detail-section,
body:not(.theme-light) .about-research-section,
body:not(.theme-light) .cooperation-section,
body:not(.theme-light) .contact-section,
body:not(.theme-light) .mentor-content-section,
body:not(.theme-light) .mentor-gallery-section,
body:not(.theme-light) .research-pills-section,
body:not(.theme-light) .research-cta-section,
body:not(.theme-light) .mentors-preview-section,
body:not(.theme-light) .mentor-thumbs-section,
body:not(.theme-light) .marquee-section,
body:not(.theme-light) .cta-section,
body:not(.theme-light) .student-3d-section,
body:not(.theme-light) .about-v2,
body:not(.theme-light) .research-item-v2,
body:not(.theme-light) .footer-v2,
body:not(.theme-light) .horizontal-scroll-section,
body:not(.theme-light) .m3-section {
  background: transparent !important;
}

/* 深色模式下页脚也透明 */
body:not(.theme-light) footer {
  background: transparent !important;
}

/* 亮色模式下m3-section恢复白底黑字 */
body.theme-light .m3-section {
  background: #ffffff !important;
  color: #000000 !important;
}

body.theme-light .m3-section .m3-info-name,
body.theme-light .m3-section .m3-info-title,
body.theme-light .m3-section .m3-sec-header .section-title,
body.theme-light .m3-section .m3-counter,
body.theme-light .m3-section .m3-back {
  color: #000000 !important;
}

body.theme-light .m3-section .m3-info-label,
body.theme-light .m3-section .m3-info-key,
body.theme-light .m3-section .m3-info-val,
body.theme-light .m3-section .m3-sec-header .section-label,
body.theme-light .m3-section .m3-counter,
body.theme-light .m3-section .m3-scroll-hint {
  color: rgba(0, 0, 0, 0.55) !important;
}

body.theme-light .m3-section .m3-card {
  background: #ffffff !important;
  border-color: rgba(0, 0, 0, 0.1) !important;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1) !important;
}

body.theme-light .m3-section .m3-dot {
  background: rgba(0, 0, 0, 0.2) !important;
}

body.theme-light .m3-section .m3-dot.active {
  background: #000000 !important;
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.3) !important;
}

body.theme-light .m3-section .m3-arrow {
  border-color: rgba(0, 0, 0, 0.18) !important;
  color: rgba(0, 0, 0, 0.6) !important;
}

body.theme-light .m3-section .m3-glow {
  display: none !important;
}

/* 亮色模式下学生3D区恢复白底 */
body.theme-light .student-3d-section {
  background: #ffffff !important;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

a:hover {
  opacity: 0.7;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* ---------- Theme Toggle Button ---------- */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
  background: transparent;
  color: var(--text-primary);
  flex-shrink: 0;
  position: relative;
}

.theme-toggle:hover {
  border-color: var(--text-primary);
}

.theme-toggle-icon {
  display: block;
  width: 18px;
  height: 18px;
  position: relative;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  /* Dark mode: show crescent moon */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z'/%3E%3C/svg%3E");
}

/* Light mode: show full sun */
body.theme-light .theme-toggle-icon {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='5'/%3E%3Cline x1='12' y1='1' x2='12' y2='3'/%3E%3Cline x1='12' y1='21' x2='12' y2='23'/%3E%3Cline x1='4.22' y1='4.22' x2='5.64' y2='5.64'/%3E%3Cline x1='18.36' y1='18.36' x2='19.78' y2='19.78'/%3E%3Cline x1='1' y1='12' x2='3' y2='12'/%3E%3Cline x1='21' y1='12' x2='23' y2='12'/%3E%3Cline x1='4.22' y1='19.78' x2='5.64' y2='18.36'/%3E%3Cline x1='18.36' y1='5.64' x2='19.78' y2='4.22'/%3E%3C/svg%3E");
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
}

h3 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

.text-large {
  font-size: 1.25rem;
  line-height: 1.7;
}

.text-medium {
  font-size: 1rem;
  line-height: 1.6;
}

.text-small {
  font-size: 0.875rem;
  line-height: 1.5;
}

.text-caption {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

.text-secondary {
  color: var(--text-secondary);
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
}

.container-narrow {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 40px;
}

.section {
  padding: var(--section-padding);
}

.section-header {
  margin-bottom: 80px;
  text-align: left;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-weight: 500;
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid var(--text-primary);
  background: transparent;
  color: var(--text-primary);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.btn:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  opacity: 1;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: var(--text-secondary);
  border-color: var(--text-secondary);
}

.btn-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--text-primary);
  background: var(--text-primary);
  color: var(--bg-primary);
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all var(--transition-normal);
  transform: translateY(0);
}

.navbar.hidden-nav {
  transform: translateY(-100%);
  opacity: 0;
  border-bottom: 1px solid transparent;
}

.navbar.navbar-hide {
  transform: translateY(-100%);
  opacity: 0;
  border-bottom: 1px solid transparent;
  transition: transform 0.45s cubic-bezier(0.65, 0, 0.35, 1), opacity 0.35s ease;
}

.navbar.navbar-show {
  transform: translateY(0);
  opacity: 1;
  border-bottom: 1px solid var(--border-color);
  transition: transform 0.55s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.4s ease 0.05s;
  animation: navbarDropIn 0.55s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes navbarDropIn {
  0% {
    transform: translateY(-100%);
    opacity: 0;
    box-shadow: none;
  }
  60% {
    opacity: 1;
  }
  100% {
    transform: translateY(0);
    opacity: 1;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  }
}

.navbar.scrolled {
  height: 70px;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-logo-mark {
  width: 36px;
  height: 36px;
  border: 2px solid var(--nav-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
}

.nav-logo-img {
  height: 32px;
  width: auto;
  max-width: 280px;
  display: block;
  object-fit: contain;
}

.nav-logo-mark-img {
  height: 28px;
  width: auto;
  display: block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 20px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--nav-text);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.nav-link:hover {
  opacity: 0.7;
}

.nav-link.active {
  font-weight: 600;
  position: relative;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: linear-gradient(90deg, #4f6bff, #9b5cff);
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(79, 107, 255, 0.5);
}

.nav-link:hover::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: var(--text-primary);
  opacity: 0.4;
  border-radius: 2px;
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 200px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  padding: 8px 0;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dropdown-item {
  display: block;
  padding: 12px 24px;
  font-size: 0.875rem;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.dropdown-item:hover {
  background: var(--bg-secondary);
  opacity: 1;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  cursor: pointer;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--nav-text);
  transition: all var(--transition-fast);
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-content {
  text-align: center;
  z-index: 10;
  padding: 40px;
}

.hero-label {
  display: inline-block;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-weight: 500;
  margin-bottom: 32px;
  color: var(--text-secondary);
}

.hero-title {
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-title .line {
  display: block;
  overflow: hidden;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.5rem);
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 48px;
  font-weight: 300;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  animation: bounce 2s infinite;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: var(--text-secondary);
  position: relative;
  overflow: hidden;
}

.hero-scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--text-primary);
  animation: scrollLine 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

@keyframes scrollLine {
  0% { top: -100%; }
  100% { top: 100%; }
}

/* Hero dynamic background placeholder */
.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.hero-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(128, 128, 128, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(128, 128, 128, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ---------- About Intro Section ---------- */
.about-intro {
  padding: var(--section-padding);
  background: var(--bg-primary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-text-block {
  position: sticky;
  top: 120px;
}

.about-text-block .section-label {
  margin-bottom: 24px;
}

.about-text-block h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  margin-bottom: 32px;
  line-height: 1.3;
}

.about-placeholder {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
  border: 1px dashed var(--border-color);
  padding: 32px;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.research-areas {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--border-color);
  border: 1px solid var(--border-color);
}

.research-card {
  background: var(--bg-primary);
  padding: 40px 32px;
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.research-card:hover {
  background: var(--bg-secondary);
  transform: translateY(-2px);
}

.research-number {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.research-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  font-weight: 600;
}

.research-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.research-card-placeholder {
  border: 1px dashed var(--border-color);
  min-height: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* ---------- Horizontal Scroll Section ---------- */
.horizontal-scroll-section {
  padding: var(--section-padding);
  background: var(--bg-primary);
}

.scroll-container-wrapper {
  position: relative;
  margin: 0 -40px;
  padding: 0 40px;
}

.scroll-container {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding: 20px 0 40px;
  cursor: grab;
}

.scroll-container:active {
  cursor: grabbing;
}

.scroll-container::-webkit-scrollbar {
  height: 4px;
}

.scroll-container::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

.scroll-container::-webkit-scrollbar-thumb {
  background: var(--text-secondary);
  border-radius: 2px;
}

.scroll-card {
  flex-shrink: 0;
  width: 360px;
  scroll-snap-align: start;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  transition: all var(--transition-normal);
  cursor: pointer;
  overflow: hidden;
}

.scroll-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.scroll-card-image {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--card-border);
  position: relative;
  overflow: hidden;
}

.scroll-card-content {
  padding: 24px;
}

.scroll-card-tag {
  display: inline-block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 12px;
  padding: 4px 10px;
  border: 1px solid var(--border-color);
}

.scroll-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.scroll-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.scroll-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.scroll-controls {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  justify-content: center;
}

.scroll-btn {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.scroll-btn:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

/* ---------- Mentor Card (Horizontal) ---------- */
.mentor-card {
  display: flex;
  flex-shrink: 0;
  width: 560px;
  scroll-snap-align: start;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  transition: all var(--transition-normal);
  cursor: pointer;
  overflow: hidden;
}

.mentor-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.mentor-card-image {
  width: 240px;
  flex-shrink: 0;
  background: var(--bg-secondary);
  position: relative;
}

.mentor-card-image::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  border: 2px dashed var(--border-color);
  border-radius: 50%;
}

.mentor-card-content {
  padding: 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.mentor-card-role {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.mentor-card-name {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.mentor-card-title {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.mentor-card-bio {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
  flex: 1;
}

.mentor-card-link {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ---------- Student Card Grid ---------- */
.student-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.student-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  transition: all var(--transition-normal);
  cursor: pointer;
  overflow: hidden;
}

.student-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.student-card-image {
  width: 100%;
  aspect-ratio: 1;
  background: var(--bg-secondary);
  position: relative;
  border-bottom: 1px solid var(--card-border);
}

.student-card-image::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  border: 2px dashed var(--border-color);
  border-radius: 50%;
}

.student-card-content {
  padding: 24px;
}

.student-card-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.student-card-info {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.student-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.student-card-tag {
  font-size: 0.7rem;
  padding: 3px 8px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

/* ---------- Project Filter ---------- */
.filter-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.filter-tab {
  padding: 10px 24px;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-tab:hover,
.filter-tab.active {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

/* ---------- Project Grid ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  transition: all var(--transition-normal);
  cursor: pointer;
  overflow: hidden;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.project-card-image {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--card-border);
}

.project-card-image::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 48px;
  display: none;
}

.project-card-content {
  padding: 24px;
}

.project-card-category {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.project-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.project-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ---------- Activity Page ---------- */
.activity-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.activity-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  transition: all var(--transition-normal);
  cursor: pointer;
  overflow: hidden;
}

.activity-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.activity-card-image {
  width: 100%;
  aspect-ratio: 16/10;
  background: var(--bg-secondary);
  position: relative;
  border-bottom: 1px solid var(--card-border);
}

.activity-card-image::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  border: 2px dashed var(--border-color);
}

/* Activity custom images */
.activity-img-huaiyangchun {
  background: linear-gradient(135deg, #8B4513 0%, #D4A574 50%, #F5DEB3 100%);
}

.activity-img-gsc {
  background: linear-gradient(135deg, #FFD700 0%, #FFA500 50%, #FF6347 100%);
}

.activity-img-yilong {
  background: linear-gradient(135deg, #1a237e 0%, #3949ab 50%, #7986cb 100%);
}

/* Activity card with real image */
.activity-card-image[style*="background-image"]::before {
  display: none;
}

.activity-card-image[style*="background-image"]::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.4) 0%, transparent 40%);
  pointer-events: none;
}

.activity-img-overlay {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
}

.activity-img-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 500;
  border-radius: 20px;
}

.activity-img-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  text-align: center;
  line-height: 1.2;
}

.activity-img-text small {
  font-size: 1rem;
  font-weight: 500;
  opacity: 0.9;
}

.activity-card-content {
  padding: 24px;
}

.activity-date {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.activity-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.activity-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ---------- Cooperation Page ---------- */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: var(--border-color);
  border: 1px solid var(--border-color);
}

/* Partner Marquee */
.partner-marquee {
  overflow: hidden;
  position: relative;
  width: 100%;
  mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.partner-marquee-track {
  display: flex;
  align-items: center;
  gap: 40px;
  width: max-content;
  animation: partnerScroll 30s linear infinite;
}

.partner-marquee:hover .partner-marquee-track {
  animation-play-state: paused;
}

.partner-marquee-item {
  flex-shrink: 0;
  width: 180px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 12px 16px;
  transition: all var(--transition-normal);
}

.partner-marquee-item:hover {
  border-color: var(--accent-purple);
  box-shadow: 0 8px 32px rgba(124, 58, 237, 0.15);
  transform: translateY(-2px);
}

.partner-logo-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

@keyframes partnerScroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(calc(-180px * 8 - 40px * 8));
  }
}

.partner-card {
  background: var(--bg-primary);
  padding: 48px 32px;
  transition: all var(--transition-normal);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.partner-card:hover {
  background: var(--bg-secondary);
}

.partner-card .partner-logo-img {
  height: 80px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  display: block;
}

.partner-name {
  font-size: 0.9rem;
  font-weight: 500;
}

.cooperation-section {
  margin-top: 120px;
}

.cooperation-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

.cooperation-item:first-child {
  border-top: 1px solid var(--border-color);
}

.cooperation-year {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

.cooperation-content h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  font-weight: 600;
}

.cooperation-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---------- Contact Page ---------- */
.contact-section {
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
}

.contact-section .container {
  width: 100%;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  max-width: 1100px;
  margin: 0 auto;
  align-items: center;
  min-height: 500px;
}

.contact-info {
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.contact-info h2 {
  margin-bottom: 36px;
  text-align: left;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: center;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: center;
}

.contact-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
  font-weight: 500;
}

.contact-value {
  font-size: 1.125rem;
  font-weight: 500;
}

.contact-info .section-label + h2 + .contact-list {
  margin-top: 0;
}

.contact-image-wrapper {
  border: 1px solid var(--border-color);
  overflow: hidden;
  width: 100%;
  display: flex;
  align-items: center;
}

.contact-workspace-img {
  width: 100%;
  height: auto;
  display: block;
}

.contact-form-wrapper {
  border: 1px solid var(--border-color);
  padding: 48px;
  max-width: 680px;
  margin: 0 auto;
}

.contact-form-wrapper h3 {
  margin-bottom: 32px;
  font-size: 1.5rem;
}

.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-weight: 500;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--text-primary);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* ---------- Detail Page ---------- */
.detail-hero {
  padding-top: calc(var(--nav-height) + 80px);
  padding-bottom: 80px;
}

.detail-hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.detail-hero-image {
  aspect-ratio: 4/5;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  position: relative;
  background-size: cover;
  background-position: center;
}

.detail-hero-image.placeholder-pulse::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 96px;
  height: 96px;
  border: 2px dashed var(--border-color);
  border-radius: 50%;
}

.detail-hero-text .section-label {
  margin-bottom: 24px;
}

.detail-hero-text h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 24px;
}

.detail-hero-text p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
}

.detail-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.detail-meta-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.detail-meta-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.detail-meta-value {
  font-size: 0.95rem;
  font-weight: 500;
}

.detail-meta-blog .detail-meta-blog-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: linear-gradient(135deg, rgba(79, 107, 255, 0.12), rgba(155, 92, 255, 0.12));
  border: 1px solid rgba(126, 107, 242, 0.25);
  border-radius: 50px;
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.detail-meta-blog .detail-meta-blog-link:hover {
  background: linear-gradient(135deg, rgba(79, 107, 255, 0.2), rgba(155, 92, 255, 0.2));
  border-color: rgba(126, 107, 242, 0.4);
  transform: translateY(-1px);
}

.detail-meta-blog .blog-link-icon {
  font-size: 0.85rem;
  color: rgba(155, 92, 255, 0.9);
}

.detail-meta-blog .blog-link-arrow {
  transition: transform var(--transition-normal);
  font-size: 0.85rem;
}

.detail-meta-blog .detail-meta-blog-link:hover .blog-link-arrow {
  transform: translateX(3px);
}

/* ---------- Student Blog Section ---------- */
.student-blog-section {
  padding: 60px 0 40px;
}

.student-blog-card {
  max-width: 720px;
  margin: 0 auto;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 48px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.student-blog-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(126, 107, 242, 0.6), transparent);
}

.student-blog-header {
  margin-bottom: 28px;
}

.student-blog-header .section-label {
  display: inline-block;
  margin-bottom: 12px;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.student-blog-header h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.student-blog-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.student-blog-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 32px;
  background: linear-gradient(135deg, rgba(79, 107, 255, 0.15), rgba(155, 92, 255, 0.15));
  border: 1px solid rgba(126, 107, 242, 0.3);
  border-radius: 50px;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.student-blog-btn:hover {
  background: linear-gradient(135deg, rgba(79, 107, 255, 0.25), rgba(155, 92, 255, 0.25));
  border-color: rgba(126, 107, 242, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(126, 107, 242, 0.2);
}

.blog-icon {
  font-size: 1.1rem;
  color: rgba(155, 92, 255, 0.9);
}

.blog-arrow {
  transition: transform var(--transition-normal);
}

.student-blog-btn:hover .blog-arrow {
  transform: translateX(4px);
}

@media (max-width: 768px) {
  .student-blog-card {
    padding: 32px 24px;
    margin: 0 20px;
  }

  .student-blog-header h2 {
    font-size: 1.4rem;
  }
}

.detail-section {
  padding: 80px 0;
  border-top: 1px solid var(--border-color);
}

.detail-section h2 {
  font-size: 2rem;
  margin-bottom: 32px;
}

.detail-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.detail-gallery-item {
  aspect-ratio: 4/3;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  position: relative;
}

.detail-gallery-item::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 48px;
  border: 2px dashed var(--border-color);
}

.detail-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.detail-list-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.detail-list-item::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--text-primary);
  flex-shrink: 0;
}

/* ---------- About + Research Layout (Left Text + Right List) ---------- */
.about-research-section {
  padding: 140px 0;
}

.about-research-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}

.about-research-left {
  position: sticky;
  top: 120px;
}

.about-research-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 20px 0 30px;
}

.about-research-text {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-secondary);
  margin: 0 0 20px;
  max-width: 420px;
}

.about-research-left .btn-text {
  margin-top: 20px;
}

.research-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.research-list-item {
  display: flex;
  align-items: center;
  gap: 30px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
  cursor: pointer;
}

.research-list-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
  transition: transform 0.3s ease;
}

.research-list-desc {
  font-size: 0.82rem;
  font-weight: 300;
  line-height: 1.6;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  transition: color 0.3s ease;
}

.research-list-item:first-child {
  border-top: 1px solid var(--border-color);
}

.research-list-item:hover {
  padding-left: 15px;
  background: var(--bg-secondary);
  border-color: transparent;
}

.research-list-num {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-tertiary);
  letter-spacing: 0.1em;
  min-width: 40px;
}

.research-list-name {
  font-size: clamp(1.1rem, 1.5vw, 1.4rem);
  font-weight: 600;
  color: var(--text-primary);
}

@media (max-width: 900px) {
  .about-research-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }
  
  .about-research-left {
    position: static;
  }
}

/* ---------- Mentor Fullpage Section (in about page) ---------- */
.mentor-fullpage-section {
  height: 100vh;
  min-height: 600px;
  position: relative;
  overflow: hidden;
  background: #0a0a0a;
}

.mentor-fullpage-inner {
  height: 100%;
  position: relative;
}

.mentor-fp-slides {
  height: 100%;
  position: relative;
}

.mentor-fp-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s cubic-bezier(0.77, 0, 0.175, 1), visibility 0.8s ease;
}

.mentor-fp-slide.active {
  opacity: 1;
  visibility: visible;
  z-index: 1;
}

.mentor-fp-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transform: scale(1.1);
  transition: transform 6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.mentor-fp-slide.active .mentor-fp-bg {
  transform: scale(1);
}

.mentor-fp-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.3) 50%, rgba(0,0,0,0.1) 100%);
  z-index: 1;
}

.mentor-fp-content {
  position: absolute;
  left: 8%;
  top: 50%;
  transform: translateY(30px);
  max-width: 550px;
  color: #fff;
  z-index: 2;
  opacity: 0;
  transition: all 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.2s;
}

.mentor-fp-slide.active .mentor-fp-content {
  transform: translateY(-50%);
  opacity: 1;
}

.mentor-fp-label {
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 24px;
}

.mentor-fp-name {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  margin: 0 0 16px;
  color: #fff;
  letter-spacing: -0.02em;
}

.mentor-fp-title {
  font-size: 1.3rem;
  color: rgba(255,255,255,0.8);
  margin: 0 0 28px;
  font-weight: 400;
}

.mentor-fp-desc {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.7);
  margin: 0 0 40px;
}

.mentor-fp-btn {
  display: inline-block;
  padding: 16px 40px;
  border: 1px solid rgba(255,255,255,0.4);
  color: #fff;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  transition: all 0.3s ease;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.mentor-fp-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--card-bg);
  transition: left 0.3s ease;
  z-index: -1;
}

.mentor-fp-btn:hover {
  color: var(--text-primary);
  border-color: #fff;
}

.mentor-fp-btn:hover::before {
  left: 0;
}

/* Arrows */
.mentor-fp-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 56px;
  height: 56px;
  border: 1px solid rgba(255,255,255,0.3);
  background: transparent;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 10;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mentor-fp-arrow:hover {
  background: var(--card-bg);
  color: var(--text-primary);
  border-color: #fff;
}

.mentor-fp-arrow.prev {
  left: 30px;
}

.mentor-fp-arrow.next {
  right: 60px;
}

/* Dots */
.mentor-fp-dots {
  position: absolute;
  right: 30px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 16px;
  z-index: 10;
}

.mentor-fp-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  cursor: pointer;
  transition: all 0.3s ease;
}

.mentor-fp-dot:hover {
  background: rgba(255,255,255,0.6);
}

.mentor-fp-dot.active {
  background: var(--card-bg);
  transform: scale(1.3);
}

/* Counter */
.mentor-fp-counter {
  position: absolute;
  top: 50px;
  left: 8%;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  z-index: 10;
  letter-spacing: 0.05em;
}

.mentor-fp-counter .current {
  font-size: 2.5rem;
}

.mentor-fp-counter .divider {
  color: rgba(255,255,255,0.4);
  margin: 0 4px;
  font-weight: 300;
}

.mentor-fp-counter .total {
  font-size: 1rem;
  color: rgba(255,255,255,0.5);
  font-weight: 400;
}

/* Scroll Hint */
.mentor-fp-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: rgba(255,255,255,0.5);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  z-index: 10;
}

.mentor-fp-scroll-hint .scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.5), transparent);
  animation: scrollLineAnim 2s ease-in-out infinite;
}

@keyframes scrollLineAnim {
  0%, 100% { opacity: 0.5; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.3); }
}

/* Section Header */
.mentor-fp-header {
  position: absolute;
  top: 50px;
  right: 8%;
  text-align: right;
  color: #fff;
  z-index: 10;
}

.mentor-fp-section-label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 8px;
}

.mentor-fp-section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  color: #fff;
}

@media (max-width: 768px) {
  .mentor-fp-name {
    font-size: 2.5rem;
  }
  
  .mentor-fp-content {
    left: 5%;
    right: 5%;
    max-width: none;
  }
  
  .mentor-fp-arrow {
    width: 44px;
    height: 44px;
  }
  
  .mentor-fp-arrow.prev {
    left: 10px;
  }
  
  .mentor-fp-arrow.next {
    right: 40px;
  }
  
  .mentor-fp-dots {
    right: 15px;
  }
  
  .mentor-fp-counter {
    top: 30px;
    left: 5%;
    font-size: 1.5rem;
  }
  
  .mentor-fp-header {
    top: 30px;
    right: 5%;
  }
  
  .mentor-fp-section-title {
    font-size: 1.2rem;
  }
}

/* ---------- Student 3D Cover Flow Carousel ---------- */
.student-3d-section {
  padding: 120px 0 100px;
  background: #050508;
  overflow: hidden;
  position: relative;
}

.student-3d-carousel {
  position: relative;
  height: 480px;
  margin-top: 40px;
  perspective: 1200px;
  perspective-origin: center center;
}

.student-3d-stage {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
}

.student-3d-card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300px;
  height: 420px;
  margin-left: -150px;
  margin-top: -210px;
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-primary);
  transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  transform-origin: center center;
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.student-3d-card.active {
  z-index: 10;
}

.student-3d-img {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #e0e0e0 0%, #c0c0c0 100%);
  transition: transform 0.6s ease;
}

.student-3d-card.active .student-3d-img {
  transform: scale(1.05);
}

.student-3d-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 30px 25px;
  background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.5) 60%, transparent 100%);
  color: #fff;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.student-3d-card.active .student-3d-overlay {
  opacity: 1;
}

.student-3d-role {
  display: inline-block;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.8);
  margin-bottom: 8px;
  padding: 3px 10px;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 20px;
}

.student-3d-name {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 0 4px;
  color: #fff;
}

.student-3d-info {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.7);
  margin: 0 0 12px;
}

.student-3d-tags {
  display: flex;
  gap: 6px;
}

.student-3d-tags span {
  font-size: 0.65rem;
  padding: 3px 8px;
  background: rgba(255,255,255,0.2);
  border-radius: 20px;
  color: #fff;
}

.student-3d-num {
  position: absolute;
  top: 15px;
  right: 15px;
  font-size: 2.5rem;
  font-weight: 900;
  color: rgba(255,255,255,0.25);
  line-height: 1;
  z-index: 1;
}

/* Controls */
.student-3d-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  margin-top: 30px;
}

.student-3d-arrow {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.student-3d-arrow:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  transform: scale(1.1);
}

.student-3d-arrow:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.student-3d-dots {
  display: flex;
  gap: 10px;
}

.student-3d-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-color);
  cursor: pointer;
  transition: all 0.3s ease;
}

.student-3d-dot.active {
  background: var(--text-primary);
  transform: scale(1.3);
}

/* Info bar */
.student-3d-info-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: 400px;
  margin: 20px auto 0;
}

.student-3d-counter {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  min-width: 60px;
}

.student-3d-counter #student3DCurrent {
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.1rem;
}

.student-3d-progress {
  flex: 1;
  height: 2px;
  background: var(--border-color);
  border-radius: 2px;
  overflow: hidden;
}

.student-3d-progress-fill {
  height: 100%;
  background: var(--text-primary);
  width: 0%;
  transition: width 0.4s ease;
}

@media (max-width: 768px) {
  .student-3d-carousel {
    height: 400px;
    perspective: 900px;
  }
  
  .student-3d-card {
    width: 240px;
    height: 340px;
    margin-left: -120px;
    margin-top: -170px;
  }
  
  .student-3d-num {
    font-size: 2rem;
  }
  
  .student-3d-arrow {
    width: 40px;
    height: 40px;
  }
}

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 60px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
}

.footer-logo-mark {
  width: 40px;
  height: 40px;
  border: 2px solid var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 800;
}

.footer-logo-mark-img {
  height: 28px;
  width: auto;
  display: block;
}

/* 导航栏logo缩小到2/3 */
.nav-logo-mark-img {
  height: 19px;
  width: auto;
  display: block;
}

.footer-tagline {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 300px;
}

.footer-column h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 24px;
  font-weight: 600;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--text-primary);
  opacity: 1;
}

.footer-bottom {
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
  opacity: 1;
}

/* ---------- Page Header (for subpages) ---------- */
.page-header {
  padding-top: calc(var(--nav-height) + 80px);
  padding-bottom: 60px;
  text-align: center;
}

.page-header .section-label {
  margin-bottom: 20px;
}

.page-header h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: 20px;
}

.page-header p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .container,
  .container-narrow,
  .nav-container {
    padding: 0 24px;
  }

  .section {
    padding: 80px 0;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .about-text-block {
    position: static;
  }

  .student-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .project-grid,
  .activity-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .partner-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .detail-hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 70px;
  }

  .nav-menu {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .student-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-grid,
  .activity-grid {
    grid-template-columns: 1fr;
  }

  .partner-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .research-areas {
    grid-template-columns: 1fr;
  }

  .mentor-card {
    width: 320px;
    flex-direction: column;
  }

  .mentor-card-image {
    width: 100%;
    aspect-ratio: 1;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

  .cooperation-item {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .detail-meta {
    grid-template-columns: 1fr;
  }

  .detail-gallery {
    grid-template-columns: 1fr;
  }

  .contact-image-wrapper {
    aspect-ratio: 16/9;
  }

  .contact-form-wrapper {
    padding: 32px 24px;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .hero-cta .btn {
    width: 100%;
    max-width: 280px;
  }
}

@media (max-width: 480px) {
  .container,
  .container-narrow,
  .nav-container {
    padding: 0 16px;
  }

  .student-grid {
    grid-template-columns: 1fr;
  }

  .scroll-card {
    width: 280px;
  }

  .partner-grid {
    grid-template-columns: 1fr;
  }

  .filter-tabs {
    flex-direction: column;
  }

  .filter-tab {
    text-align: center;
  }
}

/* ---------- Utility Classes ---------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 48px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 48px; }

/* ---------- Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Placeholder animation */
.placeholder-pulse {
  position: relative;
  overflow: hidden;
}

.placeholder-pulse::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(128, 128, 128, 0.05) 50%,
    transparent 100%
  );
  animation: placeholderShimmer 2s infinite;
}

@keyframes placeholderShimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* ============================================
   Enhanced Hero Section (Fullscreen Immersive)
   ============================================ */
.hero-immersive {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: var(--color-black);
  perspective: 1000px;
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: none;
}

#hero-particle-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: none;
}

.hero-immersive .hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.hero-immersive .hero-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.6;
}

/* Glowing orb effect */
.hero-orb {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.02) 40%, transparent 70%);
  filter: blur(60px);
  z-index: 2;
  animation: orbFloat 8s ease-in-out infinite;
}

.hero-orb.orb-1 {
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.hero-orb.orb-2 {
  bottom: 10%;
  right: 10%;
  animation-delay: -4s;
  width: 400px;
  height: 400px;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}

/* Hero content */
.hero-immersive .hero-content {
  text-align: center;
  z-index: 10;
  padding: 40px;
  position: relative;
}

.hero-immersive .hero-label {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.4em;
  font-weight: 400;
  margin-bottom: 40px;
  color: rgba(255, 255, 255, 0.6);
  animation: fadeInUp 1s ease 0.2s both;
}

.hero-immersive .hero-title {
  font-size: clamp(4rem, 12vw, 9rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin-bottom: 32px;
  color: #fff;
  animation: fadeInUp 1s ease 0.4s both;
}

.hero-immersive .hero-title .line {
  display: block;
  overflow: hidden;
}

.hero-immersive .hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255, 255, 255, 0.6);
  max-width: 600px;
  margin: 0 auto 56px;
  font-weight: 300;
  letter-spacing: 0.02em;
  animation: fadeInUp 1s ease 0.6s both;
}

.hero-immersive .hero-cta {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease 0.8s both;
}

.hero-immersive .btn {
  padding: 16px 40px;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
}

.hero-immersive .btn-primary {
  background: var(--card-bg);
  color: var(--text-primary);
  border-color: #fff;
}

.hero-immersive .btn-primary:hover {
  background: transparent;
  color: #fff;
}

.hero-immersive .btn-outline {
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
}

.hero-immersive .btn-outline:hover {
  border-color: #fff;
  background: transparent;
  color: #fff;
}

/* Side labels */
.hero-side-label {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: rgba(255, 255, 255, 0.3);
  writing-mode: vertical-rl;
  z-index: 10;
}

.hero-side-label.left {
  left: 40px;
}

.hero-side-label.right {
  right: 40px;
}

/* Bottom indicator */
.hero-bottom-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 40px 60px;
  z-index: 10;
}

.hero-bottom-text {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.1em;
}

.hero-scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.hero-scroll-bottom {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  z-index: 10;
  animation: scrollBounce 2s ease-in-out infinite;
}

.scroll-arrow-bottom {
  font-size: 1.2rem;
  animation: arrowBounce 1.5s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

@keyframes arrowBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

.hero-scroll-line {
  width: 1px;
  height: 60px;
  background: rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

.hero-scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--card-bg);
  animation: scrollLineDown 2s ease-in-out infinite;
}

@keyframes scrollLineDown {
  0% { top: -100%; }
  50%, 100% { top: 100%; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   Mentor Detail Page Redesign
   ============================================ */
.mentor-detail-hero {
  position: relative;
  padding: 120px 40px 80px;
  background: transparent;
  overflow: hidden;
}

.mentor-detail-hero-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 60px;
}

.mentor-detail-image-wrapper {
  flex-shrink: 0;
  width: 280px;
  height: 350px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.mentor-detail-image {
  width: 100%;
  height: 100%;
  background: var(--bg-secondary);
  position: relative;
  background-size: cover;
  background-position: center top;
}

.mentor-detail-image::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120px;
  height: 120px;
  border: 2px dashed var(--border-color);
  border-radius: 50%;
}

.mentor-detail-image.has-photo::before {
  display: none;
}

.mentor-detail-info {
  flex: 1;
  text-align: left;
}

.mentor-detail-name {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.mentor-detail-title {
  font-size: 1.25rem;
  color: var(--text-primary);
  margin-bottom: 24px;
  font-weight: 600;
}

.mentor-detail-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.mentor-detail-tag {
  padding: 8px 20px;
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  border-radius: 20px;
  transition: all var(--transition-fast);
}

/* Back button */
.back-button {
  position: fixed;
  top: 100px;
  left: 40px;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: transparent;
  border: none;
  font-size: 0.8rem;
  font-weight: 300;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  cursor: pointer;
  opacity: 0.6;
  transition: all var(--transition-normal);
}

.back-button:hover {
  color: var(--text-primary);
  opacity: 1;
  transform: translateX(-4px);
}

.back-button::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 1px;
  background: var(--text-primary);
  transition: width var(--transition-normal);
}

.back-button:hover::before {
  width: 20px;
}

/* Mentor info overlay (moved to hero section, left-right layout) */

.mentor-detail-tag {
  padding: 8px 20px;
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

a.mentor-detail-tag {
  text-decoration: none;
  display: inline-block;
  cursor: pointer;
  transition: border-color 0.3s ease, color 0.3s ease, background 0.3s ease;
}

a.mentor-detail-tag:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  background: var(--bg-secondary);
}

/* Blog-style content sections */
.mentor-content-section {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 40px;
}

.mentor-content-section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 24px;
  position: relative;
  padding-bottom: 16px;
}

.mentor-content-section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 2px;
  background: var(--text-primary);
}

.mentor-content-section p {
  font-size: 1rem;
  line-height: 2;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.mentor-content-section .detail-list-item {
  border-bottom: 1px solid var(--border-color);
  padding: 20px 0;
}

.mentor-content-section .detail-list-item::before {
  display: none;
}

.mentor-content-section .detail-list {
  gap: 0;
}

/* Timeline style for achievements */
.timeline-list {
  position: relative;
  padding-left: 24px;
}

.timeline-list::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  padding: 16px 0 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 24px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-primary);
}

.timeline-year {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}

.timeline-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Gallery section */
.mentor-gallery-section {
  padding: 80px 40px;
  background: var(--bg-secondary);
}

.mentor-gallery-section .container-narrow {
  margin-bottom: 48px;
}

.mentor-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border-color);
  border: 1px solid var(--border-color);
}

.mentor-gallery-item {
  aspect-ratio: 1;
  background: var(--bg-primary);
  position: relative;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.mentor-gallery-item:hover {
  opacity: 0.7;
}

.mentor-gallery-item::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 48px;
  height: 48px;
  border: 2px dashed var(--border-color);
}

.mentor-gallery-item.has-image {
  background-size: cover;
  background-position: center;
}

.mentor-gallery-item.has-image::before {
  display: none;
}

/* ============================================
   Responsive additions
   ============================================ */
@media (max-width: 768px) {
  .hero-side-label {
    display: none;
  }

  .hero-bottom-bar {
    padding: 30px 24px;
  }

  .mentor-detail-hero {
    padding: 100px 24px 60px;
  }

  .mentor-detail-hero-inner {
    flex-direction: column;
    text-align: center;
    gap: 30px;
  }

  .mentor-detail-image-wrapper {
    width: 220px;
    height: 280px;
  }

  .mentor-detail-info {
    text-align: center;
  }

  .mentor-detail-tags {
    justify-content: center;
  }

  .mentor-content-section {
    padding: 40px 24px;
  }

  .back-button {
    top: auto;
    bottom: 24px;
    left: 24px;
  }

  .mentor-gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .mentor-gallery {
    grid-template-columns: 1fr;
  }

  .mentor-detail-tags {
    flex-direction: column;
    align-items: center;
  }
}

/* ============================================
   Mentor Fullpage Scroll
   ============================================ */
.mentor-fullpage {
  height: 100vh;
  overflow: hidden;
  position: relative;
}

.mentor-slides {
  height: 100%;
  transition: transform 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.mentor-slide {
  height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.mentor-slide-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: cover;
  background-position: center 30%;
  transition: transform 1.2s cubic-bezier(0.77, 0, 0.175, 1);
  z-index: 1;
}

.mentor-slide-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, rgba(10, 8, 18, 0.85) 0%, rgba(20, 15, 40, 0.55) 50%, rgba(30, 20, 60, 0.3) 100%);
}

.mentor-slide.active .mentor-slide-bg {
  transform: scale(1.05);
}

.mentor-slide-content {
  position: relative;
  z-index: 10;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 120px 80px 0;
  width: 100%;
  color: #fff;
}

.mentor-slide-number {
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 24px;
  font-weight: 500;
}

.mentor-slide-name {
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  transform: translateY(40px);
  opacity: 0;
  transition: all 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.2s;
}

.mentor-slide.active .mentor-slide-name {
  transform: translateY(0);
  opacity: 1;
}

.mentor-slide-title {
  font-size: 1.25rem;
  font-weight: 300;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  transform: translateY(40px);
  opacity: 0;
  transition: all 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.3s;
}

.mentor-slide.active .mentor-slide-title {
  transform: translateY(0);
  opacity: 1;
}

.mentor-slide-desc {
  max-width: 500px;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.7);
  margin-bottom: 40px;
  transform: translateY(40px);
  opacity: 0;
  transition: all 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.4s;
}

.mentor-slide.active .mentor-slide-desc {
  transform: translateY(0);
  opacity: 1;
}

.mentor-slide-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 32px;
  border: 1px solid rgba(255,255,255,0.4);
  color: #fff;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s ease;
  transform: translateY(40px);
  opacity: 0;
  transition: all 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.5s, background 0.3s ease, border-color 0.3s ease;
}

.mentor-slide.active .mentor-slide-btn {
  transform: translateY(0);
  opacity: 1;
}

.mentor-slide-btn:hover {
  background: var(--card-bg);
  color: var(--text-primary);
  border-color: #fff;
  opacity: 1;
}

/* Side navigation dots */
.mentor-side-nav {
  position: fixed;
  right: 40px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 16px;
  z-index: 100;
}

.mentor-nav-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

.mentor-nav-dot.active {
  background: var(--card-bg);
  transform: scale(1.3);
}

.mentor-nav-dot::after {
  content: attr(data-name);
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.8);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.mentor-nav-dot:hover::after {
  opacity: 1;
}

/* Scroll indicator */
.mentor-scroll-hint {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: rgba(255,255,255,0.5);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  z-index: 100;
  animation: mentorBounce 2s infinite;
}

.mentor-scroll-line {
  width: 1px;
  height: 50px;
  background: rgba(255,255,255,0.2);
  position: relative;
  overflow: hidden;
}

.mentor-scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--card-bg);
  animation: mentorScrollDown 2s ease-in-out infinite;
}

@keyframes mentorBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

@keyframes mentorScrollDown {
  0% { top: -100%; }
  50%, 100% { top: 100%; }
}

/* Left/Right arrow nav */
.mentor-arrow-nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border: 1px solid rgba(255,255,255,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.8);
  cursor: pointer;
  z-index: 100;
  transition: all 0.3s ease;
  font-size: 1.25rem;
}

.mentor-arrow-nav:hover {
  background: var(--card-bg);
  color: var(--text-primary);
  border-color: #fff;
}

.mentor-arrow-nav.prev {
  left: 40px;
}

.mentor-arrow-nav.next {
  right: 40px;
}

/* Mentor counter */
.mentor-counter {
  position: fixed;
  top: 100px;
  left: 40px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.2em;
  z-index: 100;
}

.mentor-counter .current {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0;
}

/* Back to about */
.mentor-back-top {
  position: fixed;
  top: 40px;
  left: 40px;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.3s ease;
}

.mentor-back-top:hover {
  background: rgba(255,255,255,0.2);
}

/* Image transition overlay */
.mentor-image-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s ease;
}

/* Responsive for mentor fullpage */
@media (max-width: 768px) {
  .mentor-slide-content {
    padding: 100px 24px 0;
  }

  .mentor-side-nav {
    right: 16px;
  }

  .mentor-arrow-nav {
    display: none;
  }

  .mentor-counter {
    top: 80px;
    left: 24px;
  }

  .mentor-back-top {
    top: 24px;
    left: 24px;
  }
}

/* ============================================
   Hero Title Text Animation (char by char)
   ============================================ */
.hero-title-char {
  display: inline-block;
  opacity: 0;
  transform: translateY(60px) rotateX(90deg);
  animation: charReveal 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes charReveal {
  to {
    opacity: 1;
    transform: translateY(0) rotateX(0);
  }
}

/* Hero title hover - subtle color change only */
.hero-title-wrapper:hover .hero-title-char {
  color: rgba(255, 255, 255, 0.8);
}

/* Magnetic button */
.magnetic-btn {
  position: relative;
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Noise overlay */
.hero-noise {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 5;
  opacity: 0.03;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* =====================================================
   V2 PREMIUM HOMEPAGE STYLES
   ===================================================== */

/* Dark theme body */
body.theme-dark {
  background: #0a0a0a;
  color: #fff;
}

body.theme-dark * {
  color: #fff;
}

/* Minimal Navigation */
.minimal-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 30px 50px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  mix-blend-mode: difference;
}

.minimal-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.05em;
}

.logo-mark {
  width: 40px;
  height: 40px;
  border: 2px solid #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.2rem;
  transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}

.minimal-logo:hover .logo-mark {
  background: var(--card-bg);
  color: var(--text-primary);
  transform: rotate(90deg);
}

.menu-toggle {
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--card-bg);
  transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}

.menu-toggle:hover span {
  width: 22px;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
  width: 28px;
}

.menu-toggle.active span:nth-child(2) {
  transform: rotate(-45deg);
  width: 28px;
}

/* Fullscreen Menu Overlay */
.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.6s ease;
}

.menu-overlay.active {
  pointer-events: all;
  opacity: 1;
}

.menu-overlay-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #0a0a0a;
  transform: translateY(-100%);
  transition: transform 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.menu-overlay.active .menu-overlay-bg {
  transform: translateY(0);
}

.menu-overlay-content {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 100px 80px 60px;
  max-width: 1400px;
  margin: 0 auto;
}

.menu-list {
  list-style: none;
  padding: 0;
  margin: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.menu-item {
  overflow: hidden;
  opacity: 0;
  transform: translateY(100%);
  transition: all 0.6s cubic-bezier(0.77, 0, 0.175, 1);
}

.menu-overlay.active .menu-item {
  opacity: 1;
  transform: translateY(0);
}

.menu-overlay.active .menu-item:nth-child(1) { transition-delay: 0.2s; }
.menu-overlay.active .menu-item:nth-child(2) { transition-delay: 0.25s; }
.menu-overlay.active .menu-item:nth-child(3) { transition-delay: 0.3s; }
.menu-overlay.active .menu-item:nth-child(4) { transition-delay: 0.35s; }
.menu-overlay.active .menu-item:nth-child(5) { transition-delay: 0.4s; }
.menu-overlay.active .menu-item:nth-child(6) { transition-delay: 0.45s; }

.menu-link {
  display: flex;
  align-items: baseline;
  gap: 30px;
  padding: 12px 0;
  text-decoration: none;
  color: #fff;
  transition: all 0.3s ease;
}

.menu-link:hover {
  transform: translateX(20px);
}

.menu-link:hover .menu-text {
  color: #888;
}

.menu-num {
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.1em;
  min-width: 40px;
}

.menu-text {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: color 0.3s ease;
}

.menu-sub {
  font-size: 0.9rem;
  font-weight: 300;
  color: rgba(255,255,255,0.3);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-left: 20px;
}

.menu-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.1);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease;
  transition-delay: 0.6s;
}

.menu-overlay.active .menu-footer {
  opacity: 1;
  transform: translateY(0);
}

.menu-footer-left p {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
}

.menu-footer-en {
  font-size: 0.75rem !important;
  color: rgba(255,255,255,0.4) !important;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 4px !important;
}

.menu-footer-right a {
  color: #fff;
  text-decoration: none;
  font-size: 0.9rem;
  transition: opacity 0.3s ease;
}

.menu-footer-right a:hover {
  opacity: 0.6;
}

/* Hero V2 */
.hero-v2 {
  position: relative;
  height: 100vh;
  min-height: 700px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-v2-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.hero-v2-image {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, #1a1a1a 0%, #0d0d0d 50%, #1a1a1a 100%);
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
  animation: heroImageZoom 20s ease-in-out infinite alternate;
}

@keyframes heroImageZoom {
  from { transform: scale(1.05); }
  to { transform: scale(1.12); }
}

.hero-v2-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    to bottom,
    rgba(10,10,10,0.3) 0%,
    rgba(10,10,10,0.1) 40%,
    rgba(10,10,10,0.6) 100%
  );
  z-index: 2;
}

#heroCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 3;
  pointer-events: none;
}

.hero-v2-side {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.hero-v2-side.left {
  left: 50px;
  align-items: center;
}

.hero-v2-side.right {
  right: 50px;
  align-items: flex-end;
}

.hero-v2-side-text {
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  writing-mode: vertical-rl;
}

.hero-v2-side.left .hero-v2-side-text {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.hero-v2-side-line {
  width: 1px;
  height: 60px;
  background: rgba(255,255,255,0.3);
  position: relative;
  overflow: hidden;
}

.hero-v2-side-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--card-bg);
  animation: sideLineScroll 2s ease-in-out infinite;
}

@keyframes sideLineScroll {
  0% { top: -100%; }
  50% { top: 100%; }
  100% { top: 100%; }
}

.hero-v2-content {
  position: relative;
  z-index: 5;
  text-align: center;
  max-width: 900px;
  padding: 0 60px;
}

.hero-v2-label {
  margin-bottom: 30px;
}

.hero-v2-label .line-reveal-inner {
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  font-weight: 500;
}

.hero-v2-title {
  font-size: clamp(4rem, 12vw, 10rem);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.04em;
  margin: 0 0 30px;
  text-transform: uppercase;
}

.hero-v2-title .line-reveal {
  display: block;
}

.hero-v2-title .line-reveal-inner {
  display: block;
}

.hero-v2-subtitle {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  font-weight: 300;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.7);
  margin: 0 0 50px;
  line-height: 1.8;
}

.hero-v2-cta {
  display: flex;
  justify-content: center;
}

/* CTA Button */
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 18px 40px;
  background: var(--card-bg);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1);
  position: relative;
  overflow: hidden;
  border: none;
  cursor: pointer;
}

.cta-btn svg {
  stroke: #000;
  transition: transform 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}

.cta-btn:hover {
  background: #1a1a1a;
  color: #fff;
}

.cta-btn:hover svg {
  stroke: #fff;
  transform: translateX(5px);
}

.cta-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.6s ease;
}

.cta-btn:hover::before {
  left: 100%;
}

.cta-btn.light {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
}

.cta-btn.light svg {
  stroke: #fff;
}

.cta-btn.light:hover {
  background: var(--card-bg);
  color: var(--text-primary);
  border-color: #fff;
}

.cta-btn.light:hover svg {
  stroke: #000;
}

/* Hero Bottom Bar */
.hero-v2-bottom {
  position: absolute;
  bottom: 40px;
  left: 0;
  right: 0;
  padding: 0 80px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  z-index: 10;
}

.hero-v2-bottom-left,
.hero-v2-bottom-right {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.hero-v2-bottom-label {
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}

.hero-v2-bottom-value {
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255,255,255,0.8);
  letter-spacing: 0.05em;
}

.hero-v2-scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.scroll-text {
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  animation: scrollTextPulse 2s ease-in-out infinite;
}

@keyframes scrollTextPulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.scroll-line {
  width: 1px;
  height: 50px;
  background: rgba(255,255,255,0.2);
  position: relative;
  overflow: hidden;
}

.scroll-line-inner {
  position: absolute;
  top: -50%;
  left: 0;
  width: 100%;
  height: 50%;
  background: var(--card-bg);
  animation: scrollLineMove 2s ease-in-out infinite;
}

@keyframes scrollLineMove {
  0% { top: -50%; }
  100% { top: 100%; }
}

/* Line Reveal Animation */
.line-reveal {
  display: inline-block;
  overflow: hidden;
  vertical-align: bottom;
}

.line-reveal-inner {
  display: inline-block;
  transform: translateY(110%);
  opacity: 0;
  transition: all 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.line-reveal.visible .line-reveal-inner {
  transform: translateY(0);
  opacity: 1;
}

/* Marquee Section */
.marquee-section {
  padding: 30px 0;
  background: var(--card-bg);
  overflow: hidden;
  border-top: 1px solid #eee;
  border-bottom: 1px solid #eee;
}

.marquee-track {
  display: flex;
  align-items: center;
  gap: 40px;
  white-space: nowrap;
  animation: marqueeScroll 30s linear infinite;
}

.marquee-item {
  font-size: clamp(1rem, 2vw, 1.5rem);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  text-transform: uppercase;
}

.marquee-dot {
  font-size: 0.5rem;
  color: #999;
}

@keyframes marqueeScroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* About V2 Section */
.about-v2 {
  padding: 160px 80px;
  background: #0a0a0a;
}

.about-v2-container {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 100px;
  align-items: start;
}

.about-v2-left {
  position: sticky;
  top: 120px;
}

.about-v2-title {
  font-size: clamp(2.5rem, 4vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 30px;
}

.about-v2-text {
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(255,255,255,0.6);
  margin: 0 0 40px;
  max-width: 400px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  transition: gap 0.3s ease;
}

.text-link:hover {
  gap: 16px;
}

.text-link-arrow {
  transition: transform 0.3s ease;
}

.text-link:hover .text-link-arrow {
  transform: translateX(4px);
}

/* Research Grid V2 */
.research-grid-v2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: rgba(255,255,255,0.1);
}

.research-item-v2 {
  background: #0a0a0a;
  padding: 40px 30px;
  transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.research-item-v2::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--card-bg);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}

.research-item-v2:hover::before {
  transform: scaleX(1);
}

.research-item-v2:hover {
  background: #111;
}

.research-num {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255,255,255,0.4);
  margin-bottom: 20px;
  letter-spacing: 0.1em;
}

.research-item-v2 h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 12px;
  color: #fff;
}

.research-item-v2 p {
  font-size: 0.85rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.5);
  margin: 0;
}

/* Featured Works */
.featured-works {
  padding: 160px 80px;
  background: var(--bg-secondary);
}

.featured-works * {
  color: var(--text-primary) !important;
}

.featured-works-header {
  max-width: 1400px;
  margin: 0 auto 60px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 30px;
}

.featured-works-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0;
}

.featured-works-grid {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.featured-work {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}

.featured-work.large {
  grid-column: span 2;
}

.featured-work-image {
  width: 100%;
  padding-top: 60%;
  background: linear-gradient(135deg, #ddd 0%, #bbb 100%);
  transition: transform 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.featured-work.large .featured-work-image {
  padding-top: 50%;
}

.featured-work:hover .featured-work-image {
  transform: scale(1.03);
}

.featured-work-info {
  padding: 25px 0 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.work-category {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #666 !important;
  font-weight: 500;
}

.work-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0;
  color: var(--text-primary) !important;
}

/* CTA Section */
.cta-section {
  padding: 160px 80px;
  background: #0a0a0a;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 70%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.cta-title {
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0 0 30px;
}

.cta-text {
  font-size: 1.1rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
  margin: 0 0 50px;
}

/* Footer V2 */
.footer-v2 {
  background: #050505;
  padding: 80px 80px 40px;
}

.footer-v2-top {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 80px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-v2-brand {
  max-width: 350px;
}

.footer-v2-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  font-size: 1.3rem;
  font-weight: 700;
}

.footer-v2-tagline {
  font-size: 0.85rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.5);
  margin: 0;
}

.footer-v2-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.footer-v2-col h4 {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin: 0 0 20px;
  font-weight: 600;
}

.footer-v2-col a,
.footer-v2-col span {
  display: block;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 0;
  transition: color 0.3s ease;
}

.footer-v2-col a:hover {
  color: #fff;
}

.footer-v2-bottom {
  max-width: 1400px;
  margin: 0 auto;
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-v2-bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  margin: 0;
}

.footer-v2-social {
  display: flex;
  gap: 25px;
}

.footer-v2-social a {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-v2-social a:hover {
  color: #fff;
}

/* Reveal Animations */
.reveal-text {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.reveal-text.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-card {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.77, 0, 0.175, 1);
  transition-delay: var(--delay, 0s);
}

.reveal-card.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
  .minimal-nav { padding: 20px 30px; }
  
  .hero-v2-side { display: none; }
  
  .hero-v2-bottom {
    padding: 0 30px;
    bottom: 30px;
  }
  
  .about-v2,
  .featured-works,
  .cta-section {
    padding: 100px 30px;
  }
  
  .about-v2-container {
    grid-template-columns: 1fr;
    gap: 60px;
  }
  
  .about-v2-left {
    position: static;
  }
  
  .menu-overlay-content {
    padding: 80px 40px 40px;
  }
  
  .menu-text {
    font-size: 2.5rem;
  }
  
  .footer-v2 {
    padding: 60px 30px 30px;
  }
  
  .footer-v2-top {
    grid-template-columns: 1fr;
    gap: 50px;
  }
}

@media (max-width: 768px) {
  .research-grid-v2 {
    grid-template-columns: 1fr;
  }
  
  .featured-works-grid {
    grid-template-columns: 1fr;
  }
  
  .featured-work.large {
    grid-column: span 1;
  }
  
  .footer-v2-links {
    grid-template-columns: 1fr 1fr;
  }
  
  .footer-v2-bottom {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
  
  .hero-v2-content {
    padding: 0 30px;
  }
  
  .hero-v2-bottom-left,
  .hero-v2-bottom-right {
    display: none;
  }
  
  .hero-v2-bottom {
    justify-content: center;
  }
}

/* ========== Research Detail Page ========== */

.research-hero {
  position: relative;
  height: 80vh;
  min-height: 500px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-dark);
  color: #fff;
}

.research-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0d0d0d 100%);
  z-index: 0;
  opacity: 0.8;
}

/* With background image */
.research-hero-bg.has-image {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 1;
}

.research-hero-bg.has-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, rgba(10, 10, 10, 0.62) 0%, rgba(10, 10, 10, 0.58) 45%, rgba(10, 10, 10, 0.72) 100%);
}

.research-hero-bg::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.research-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  margin: 0 auto;
  width: 100%;
  padding-top: 80px;
}

.research-hero-num {
  font-size: 120px;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), rgba(255,255,255,0.03));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: -30px;
  position: relative;
  z-index: 1;
  letter-spacing: -4px;
}

.research-hero-title {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  position: relative;
  z-index: 2;
  letter-spacing: -1px;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.65), 0 1px 3px rgba(0, 0, 0, 0.5);
}

.research-hero-subtitle {
  font-size: 18px;
  color: rgba(255,255,255,0.95);
  font-weight: 500;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
  position: relative;
  z-index: 2;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.72), 0 1px 3px rgba(0, 0, 0, 0.55), 0 0 26px rgba(0, 0, 0, 0.4);
  background: rgba(0, 0, 0, 0.34);
  padding: 10px 22px;
  border-radius: 100px;
  display: inline-block;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.research-hero-content .section-label {
  color: rgba(255,255,255,0.72);
  margin-bottom: 30px;
  position: relative;
  z-index: 2;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.7);
  background: rgba(0, 0, 0, 0.3);
  padding: 6px 16px;
  border-radius: 100px;
  display: inline-block;
}

/* (soft text backdrop handled per-element below) */

.research-hero-num {
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.4);
}

/* Research Pills Navigation */
.research-pills-section {
  padding: 30px 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 70px;
  z-index: 100;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.research-pills {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 5px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.research-pills::-webkit-scrollbar {
  display: none;
}

.research-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-size: 14px;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all 0.3s ease;
  cursor: pointer;
  text-decoration: none;
  flex-shrink: 0;
}

.research-pill:hover {
  border-color: var(--color-dark);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.research-pill.active {
  background: var(--color-dark);
  border-color: var(--color-dark);
  color: #fff;
}

.pill-num {
  font-size: 12px;
  font-weight: 600;
  opacity: 0.7;
}

.pill-name {
  font-weight: 500;
}

/* Research Overview */
.research-overview {
  padding: 40px 0;
}

.research-overview-text p {
  font-size: 17px;
  line-height: 2;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.research-overview-text p:last-child {
  margin-bottom: 0;
}

/* Research Areas Grid */
.research-areas-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 60px;
}

.research-area-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 40px 35px;
  transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1);
  position: relative;
  overflow: hidden;
}

.research-area-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-dark);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}

.research-area-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.08);
  border-color: transparent;
}

.research-area-card:hover::before {
  transform: scaleX(1);
}

.research-area-num {
  font-size: 48px;
  font-weight: 800;
  color: var(--bg-secondary);
  line-height: 1;
  margin-bottom: 20px;
  transition: color 0.3s ease;
}

.research-area-card:hover .research-area-num {
  color: rgba(255,255,255,0.08);
}

.research-area-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--text-primary);
  line-height: 1.4;
}

.research-area-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* Research Team */
.research-team {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 50px;
}

.research-team-member {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 20px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.research-team-member:hover {
  border-color: var(--color-dark);
  transform: translateX(4px);
}

.research-team-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.research-team-info h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.research-team-info p {
  font-size: 13px;
  color: var(--text-tertiary);
  margin: 0;
}

/* Research CTA Section */
.research-cta-section {
  padding: 100px 0;
  background: var(--color-dark);
  color: #fff;
  text-align: center;
}

.research-cta-content h2 {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.research-cta-content p {
  font-size: 18px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 40px;
}

.research-cta-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.research-cta-btns .btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
  border: 1px solid var(--text-primary);
}

.research-cta-btns .btn-primary:hover {
  background: transparent;
  color: var(--text-primary);
}

.research-cta-btns .btn-outline {
  border-color: rgba(255,255,255,0.3);
  color: #fff;
}

.research-cta-btns .btn-outline:hover {
  border-color: #fff;
  background: var(--card-bg);
  color: var(--color-dark);
}

/* Make research list items clickable */
.research-list-item {
  cursor: pointer;
  transition: all 0.3s ease;
}

.research-list-item:hover {
  background: var(--bg-secondary);
}

.research-list-item:hover .research-list-main {
  transform: translateX(8px);
}

.research-list-item:hover .research-list-name {
  transform: none;
}

.research-list-item:hover .research-list-desc {
  color: var(--text-primary);
}

.research-list-item:hover .research-list-arrow {
  opacity: 1;
  transform: translateX(0);
}

@media (max-width: 600px) {
  .research-list-item {
    gap: 18px;
    padding: 16px 0;
  }

  .research-list-num {
    min-width: 28px;
    font-size: 0.75rem;
  }

  .research-list-desc {
    font-size: 0.78rem;
  }
}

.research-list-arrow {
  opacity: 0;
  transform: translateX(-10px);
  transition: all 0.3s ease;
  font-size: 16px;
}

/* Responsive */
@media (max-width: 1024px) {
  .research-areas-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .research-hero-title {
    font-size: 44px;
  }

  .research-hero-num {
    font-size: 96px;
  }
}

@media (max-width: 768px) {
  .research-hero {
    height: 70vh;
    min-height: 400px;
  }

  .research-hero-num {
    font-size: 72px;
    margin-bottom: -20px;
  }

  .research-hero-title {
    font-size: 32px;
  }

  .research-hero-subtitle {
    font-size: 15px;
  }

  .research-areas-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .research-area-card {
    padding: 30px 25px;
  }

  .research-area-title {
    font-size: 18px;
  }

  .research-team {
    grid-template-columns: 1fr;
  }

  .research-cta-section {
    padding: 60px 0;
  }

  .research-cta-content h2 {
    font-size: 28px;
  }

  .research-cta-content p {
    font-size: 15px;
  }

  .research-cta-btns {
    flex-direction: column;
    align-items: center;
  }

  .research-pills-section {
    top: 60px;
  }

  .research-overview-text p {
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  .research-hero-num {
    font-size: 56px;
  }

  .research-hero-title {
    font-size: 26px;
  }

  .research-area-num {
    font-size: 36px;
  }
}

/* ========== Mentor Preview Carousel (Homepage) ========== */

.mentors-preview-section {
  padding-top: 120px;
  padding-bottom: 120px;
}

.mentor-preview-carousel {
  position: relative;
  overflow: hidden;
  margin-top: 60px;
  cursor: grab;
}

.mentor-preview-carousel:active {
  cursor: grabbing;
}

.mentor-preview-track {
  display: flex;
  gap: 24px;
  transition: transform 0.5s cubic-bezier(0.77, 0, 0.175, 1);
  will-change: transform;
}

.mentor-preview-track.dragging {
  transition: none;
}

.mentor-preview-card {
  flex-shrink: 0;
  width: calc((100% - 48px) / 3);
  aspect-ratio: 3 / 4;
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.5s cubic-bezier(0.77, 0, 0.175, 1), box-shadow 0.5s ease;
}

.mentor-preview-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}

.mentor-preview-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition: transform 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.mentor-preview-card:hover .mentor-preview-img {
  transform: scale(1.08);
}

.mentor-preview-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.3) 40%, transparent 70%);
  z-index: 1;
  transition: opacity 0.4s ease;
}

.mentor-preview-card:hover .mentor-preview-overlay {
  background: linear-gradient(to top, rgba(0,0,0,0.92) 0%, rgba(0,0,0,0.5) 50%, rgba(0,0,0,0.15) 80%);
}

.mentor-preview-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 30px 28px;
  z-index: 2;
  color: #fff;
}

.mentor-preview-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  opacity: 0.6;
  margin-bottom: 10px;
  letter-spacing: 1px;
}

.mentor-preview-name {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.3;
}

.mentor-preview-title {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 18px;
  line-height: 1.5;
}

.mentor-preview-more {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1);
  border-bottom: 1px solid rgba(255,255,255,0.5);
  padding-bottom: 2px;
}

.mentor-preview-card:hover .mentor-preview-more {
  opacity: 1;
  transform: translateY(0);
}

/* Arrows */
.mentor-preview-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  font-size: 20px;
  cursor: pointer;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

.mentor-preview-arrow:hover {
  background: var(--color-dark);
  color: #fff;
  border-color: var(--color-dark);
  transform: translateY(-50%) scale(1.05);
}

.mentor-preview-arrow.disabled {
  opacity: 0.3;
  pointer-events: none;
}

.mentor-preview-arrow.prev {
  left: 20px;
}

.mentor-preview-arrow.next {
  right: 20px;
}

/* Dots */
.mentor-preview-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 30px;
}

.mentor-preview-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-color);
  cursor: pointer;
  transition: all 0.3s ease;
}

.mentor-preview-dot:hover {
  background: var(--text-tertiary);
}

.mentor-preview-dot.active {
  background: var(--color-dark);
  width: 28px;
  border-radius: 4px;
}

/* Responsive */
@media (max-width: 1024px) {
  .mentor-preview-card {
    width: calc((100% - 24px) / 2);
  }
}

@media (max-width: 768px) {
  .mentors-preview-section {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .mentor-preview-card {
    width: calc((100% - 24px) / 2);
  }

  .mentor-preview-info {
    padding: 24px 20px;
  }

  .mentor-preview-name {
    font-size: 20px;
  }

  .mentor-preview-title {
    font-size: 13px;
    margin-bottom: 14px;
  }

  .mentor-preview-arrow {
    width: 44px;
    height: 44px;
    font-size: 16px;
  }

  .mentor-preview-arrow.prev {
    left: 12px;
  }

  .mentor-preview-arrow.next {
    right: 12px;
  }
}

@media (max-width: 480px) {
  .mentor-preview-card {
    width: 100%;
  }

  .mentor-preview-dots {
    margin-top: 24px;
  }
}

/* ========== Mentor Thumbnails Grid ========== */

.mentor-thumbs-section {
  padding-top: 120px;
}

.mentor-thumbs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.mentor-thumb-card {
  position: relative;
  aspect-ratio: 3 / 4;
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.5s cubic-bezier(0.77, 0, 0.175, 1);
}

.mentor-thumb-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 25px 60px rgba(0,0,0,0.15);
}

.mentor-thumb-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition: transform 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.mentor-thumb-card:hover .mentor-thumb-img {
  transform: scale(1.08);
}

.mentor-thumb-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.3) 40%, transparent 70%);
  z-index: 1;
  transition: opacity 0.4s ease;
}

.mentor-thumb-card:hover .mentor-thumb-overlay {
  background: linear-gradient(to top, rgba(0,0,0,0.92) 0%, rgba(0,0,0,0.5) 50%, rgba(0,0,0,0.15) 80%);
}

.mentor-thumb-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 30px 24px;
  z-index: 2;
  color: #fff;
}

.mentor-thumb-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  opacity: 0.6;
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.mentor-thumb-name {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.3;
}

.mentor-thumb-title {
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 16px;
  line-height: 1.5;
}

.mentor-thumb-view {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1);
  border-bottom: 1px solid rgba(255,255,255,0.5);
  padding-bottom: 2px;
}

.mentor-thumb-card:hover .mentor-thumb-view {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Mentor Fullscreen Overlay ========== */

.mentor-fullscreen-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: 9999;
  background: var(--color-dark);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.6s ease, visibility 0.6s ease;
  overflow: hidden;
}

.mentor-fullscreen-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mentor-fullscreen-overlay .mentor-fullpage-inner {
  height: 100%;
  opacity: 0;
  transform: scale(1.05);
  transition: all 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.2s;
}

.mentor-fullscreen-overlay.active .mentor-fullpage-inner {
  opacity: 1;
  transform: scale(1);
}

.mentor-fs-close {
  position: fixed;
  top: 30px;
  right: 40px;
  width: 48px;
  height: 48px;
  border: none;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  cursor: pointer;
  z-index: 10001;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.mentor-fs-close:hover {
  background: rgba(255,255,255,0.2);
  transform: rotate(90deg);
}

.mentor-fs-close span {
  position: absolute;
  width: 20px;
  height: 2px;
  background: var(--card-bg);
  border-radius: 1px;
}

.mentor-fs-close span:nth-child(1) {
  transform: rotate(45deg);
}

.mentor-fs-close span:nth-child(2) {
  transform: rotate(-45deg);
}

/* Prevent body scroll when overlay is active */
body.mentor-fs-open {
  overflow: hidden;
}

/* Responsive */
@media (max-width: 1024px) {
  .mentor-thumbs-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .mentor-thumbs-section {
    padding-top: 80px;
  }

  .mentor-thumbs-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 40px;
  }

  .mentor-thumb-info {
    padding: 20px 16px;
  }

  .mentor-thumb-name {
    font-size: 18px;
  }

  .mentor-thumb-title {
    font-size: 12px;
    margin-bottom: 12px;
  }

  .mentor-fs-close {
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .mentor-thumbs-grid {
    grid-template-columns: 1fr;
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
  }

  .mentor-thumb-card {
    aspect-ratio: 4 / 5;
  }
}

/* ================================================================
   移动端布局修复（仅 ≤ 768px 生效，不影响桌面端）
   ================================================================ */
@media (max-width: 768px) {
  /* 防止装饰光斑、视频等元素造成水平溢出 */
  html, body { overflow-x: hidden; }
  .glow-layer { overflow: hidden; position: absolute; inset: 0; pointer-events: none; }

  /* glow-blob 在手机端再缩小一圈，避免超出视口 */
  .glow-blob { max-width: 100vw; transform-origin: center; }

  /* hero video 在移动端限制宽度 */
  .hero-photo video, .hero-photo img {
    width: 100% !important;
    height: 100% !important;
    object-fit: cover;
  }

  /* 底部导航移动端：缩小间距，确保不溢出 */
  .bottom-dock {
    padding-left: 12px;
    padding-right: 12px;
    gap: 6px;
  }
  .dock-nav-slot .nav-glass {
    gap: 4px;
  }
  .dock-nav-slot .nav-glass .nav-link {
    padding-inline: 8px;
    font-size: 12px;
    height: 40px;
  }

  /* section 标题在移动端缩小 */
  .section-title h2 {
    font-size: 1.8rem;
  }
  .section-title p {
    font-size: 0.85rem;
  }

  /* 学生3D卡片移动端适配 */
  .student-3d-section { padding: 80px 0 70px; }
  .student-3d-carousel {
    height: 420px;
    margin-top: 24px;
    perspective: 800px;
    overflow: hidden;
  }
  .student-3d-card {
    width: 240px;
    height: 340px;
    margin-left: -120px;
    margin-top: -170px;
  }
  .student-3d-overlay { padding: 20px 18px; }
  .student-3d-name { font-size: 1.15rem; }
  .student-3d-info { font-size: 0.72rem; }
  .student-3d-tags span { font-size: 0.6rem; padding: 2px 7px; }
  .student-3d-num { font-size: 2rem; top: 10px; right: 10px; }
  .student-3d-controls { margin-top: 20px; gap: 20px; }
  .student-3d-arrow { width: 40px; height: 40px; }
}

@media (max-width: 480px) {
  /* 超小屏进一步收紧底部导航 */
  .bottom-dock {
    padding-left: 8px;
    padding-right: 8px;
    gap: 4px;
  }
  .dock-nav-slot .nav-glass .nav-link {
    padding-inline: 5px;
    font-size: 11px;
    height: 38px;
  }

  /* section 内边距缩小 */
  .section {
    padding-left: 20px;
    padding-right: 20px;
  }

  /* 学生3D卡片超小屏再缩小 */
  .student-3d-carousel { height: 380px; }
  .student-3d-card {
    width: 210px;
    height: 300px;
    margin-left: -105px;
    margin-top: -150px;
  }
  .student-3d-role { font-size: 0.55rem; margin-bottom: 6px; padding: 2px 8px; }
  .student-3d-name { font-size: 1rem; }
  .student-3d-info { font-size: 0.68rem; margin-bottom: 8px; }
  .student-3d-tags { gap: 4px; flex-wrap: wrap; }
  .student-3d-tags span { font-size: 0.55rem; padding: 2px 6px; }
  .student-3d-num { font-size: 1.6rem; }

  /* 详情页移动端：返回按钮缩小 */
  .back-button {
    top: 70px !important;
    left: 16px !important;
    font-size: 0.7rem !important;
    padding: 8px 14px !important;
  }

  /* 详情页 hero 缩小 */
  .detail-hero { padding-top: 100px; }
  .detail-hero-image { width: 120px; height: 120px; }
  .detail-hero-name { font-size: 1.5rem; }
  .detail-hero-role { font-size: 0.75rem; }
}