/* =====================================================
   陆俊课题组 - 浙江大学 | Modern Academic Research Site
   ===================================================== */

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

:root {
  --zju-blue:    #051c39;
  --electric:    #2563eb;
  --teal:        #3b82f6;
  --accent-2:    #1a56db;
  --glow:        rgba(37, 99, 235, 0.25);
  --glow-teal:   rgba(59, 130, 246, 0.25);
  --dark:        #0f172a;
  --dark-2:      #1e293b;
  --dark-3:      #1e3a5f;
  --card-bg:     #ffffff;
  --card-border: #e2e8f0;
  --text:        #1e293b;
  --text-muted:  #64748b;
  --text-light:  rgba(255,255,255,0.90);
  --bg:          #ffffff;
  --bg-light:    #f8fafc;
  --bg-section:  #f1f5f9;
  --border:      #e2e8f0;
  --nav-height:  68px;
  --radius:      12px;
  --radius-lg:   20px;
  --shadow:      0 2px 12px rgba(15,23,42,.07);
  --shadow-lg:   0 8px 32px rgba(15,23,42,.12);
  --shadow-glow: 0 0 24px rgba(37,99,235,0.18);
  --font-sans:   'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* --- Keyframe Animations --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 180, 216, 0.3); }
  50%       { box-shadow: 0 0 40px rgba(0, 180, 216, 0.6), 0 0 80px rgba(0, 180, 216, 0.2); }
}
@keyframes glowTeal {
  0%, 100% { box-shadow: 0 0 20px rgba(6, 214, 160, 0.3); }
  50%       { box-shadow: 0 0 40px rgba(6, 214, 160, 0.6); }
}
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-8px); }
}
@keyframes pulse-ring {
  0%   { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(0,180,216,0.5); }
  70%  { transform: scale(1);   box-shadow: 0 0 0 12px rgba(0,180,216,0); }
  100% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(0,180,216,0); }
}
@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position: 200% center; }
}
@keyframes heroGradient {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes scanline {
  0%   { transform: translateY(-100%); }
  100% { transform: translateY(100vh); }
}
@keyframes iconSpin {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}
@keyframes borderGlow {
  0%, 100% { border-color: rgba(0,180,216,0.3); box-shadow: 0 0 8px rgba(0,180,216,0.2); }
  50%       { border-color: rgba(6,214,160,0.6); box-shadow: 0 0 20px rgba(6,214,160,0.4), 0 0 40px rgba(6,214,160,0.1); }
}
@keyframes dataStream {
  0%   { background-position: 0% 0%; }
  100% { background-position: 0% 200%; }
}
@keyframes badgeFadeIn {
  from { opacity: 0; transform: translateY(10px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--electric); text-decoration: none; transition: color .2s; }
a:hover { color: var(--teal); text-decoration: none; }
h1,h2,h3,h4,h5 { line-height: 1.3; font-weight: 700; color: var(--zju-blue); }

/* --- Gradient Text Utility --- */
.gradient-text {
  background: linear-gradient(135deg, var(--electric) 0%, var(--teal) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.gradient-text-warm {
  background: linear-gradient(135deg, #fff 0%, var(--electric) 60%, var(--teal) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Layout --- */
.container { max-width: 1160px; margin: 0 auto; padding: 0 28px; }

/* --- Navbar --- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: #fff;
  z-index: 1000;
  transition: background .3s, box-shadow .3s;
  border-bottom: 1px solid var(--border);
}
.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 2px 16px rgba(15,23,42,0.09);
}
.navbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
}
.navbar-brand {
  display: flex; align-items: center; gap: 12px;
  color: var(--zju-blue) !important; text-decoration: none;
}
.navbar-brand .brand-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--electric), var(--accent-2));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.navbar-brand .brand-text { display: flex; flex-direction: column; }
.navbar-brand .brand-main { font-size: 1rem; font-weight: 700; color: var(--zju-blue); letter-spacing: .3px; }
.navbar-brand .brand-sub { font-size: 0.70rem; color: var(--text-muted); font-weight: 400; }

.nav-links { display: flex; gap: 2px; list-style: none; }
.nav-links a {
  color: var(--text-muted);
  padding: 8px 13px; border-radius: 8px;
  font-size: 0.86rem; transition: all .2s;
  white-space: nowrap; font-weight: 500;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute; bottom: 3px; left: 50%; transform: translateX(-50%);
  width: 0; height: 2px;
  background: var(--electric);
  border-radius: 1px;
  transition: width .2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--electric);
  background: rgba(37,99,235,0.06);
}
.nav-links a:hover::after, .nav-links a.active::after {
  width: calc(100% - 26px);
}

/* Mobile hamburger */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--zju-blue); margin: 5px 0; transition: .3s; border-radius: 2px; }

/* --- Main content offset --- */
main { padding-top: var(--nav-height); }

/* ==============================================
   HERO SECTION
   ============================================== */
.hero {
  background: var(--dark);
  color: #fff;
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
  min-height: 92vh;
  display: flex; align-items: center;
}

.hero-gradient-bg {
  position: absolute; inset: 0;
  background-image: url('/images/west-lake.jpg');
  background-size: cover;
  background-position: center 40%;
  background-repeat: no-repeat;
}
.hero-gradient-bg::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(5, 15, 40, 0.30) 0%,
    rgba(5, 20, 50, 0.20) 50%,
    rgba(5, 15, 40, 0.45) 100%
  );
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  opacity: 0.18;
}
.hero-orb-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,0.45) 0%, transparent 70%);
  top: -200px; right: -100px;
  animation: float 8s ease-in-out infinite;
}
.hero-orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(59,130,246,0.35) 0%, transparent 70%);
  bottom: -100px; left: 5%;
  animation: float 10s ease-in-out infinite reverse;
}
.hero-orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(15,23,42,0.7) 0%, transparent 70%);
  top: 30%; left: 30%;
}

.hero-grid-lines { display: none; }

.hero-content { position: relative; z-index: 2; width: 100%; }

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(37,99,235,0.15);
  border: 1px solid rgba(37,99,235,0.35);
  color: var(--electric); padding: 6px 16px;
  border-radius: 20px; font-size: 0.82rem; font-weight: 600;
  margin-bottom: 24px; letter-spacing: .5px;
  animation: badgeFadeIn 0.6s ease both;
}
.hero-eyebrow::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--electric);
  animation: pulse-ring 2s infinite;
  display: inline-block;
}

.hero h1 {
  color: #fff;
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  margin-bottom: 12px;
  line-height: 1.15;
  animation: fadeInUp 0.8s ease 0.1s both;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.hero h1 .gradient-text-warm {
  display: block;
  font-size: 0.82em;
  margin-top: 4px;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: rgba(255,255,255,.65);
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.7;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-badges {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease 0.3s both;
}
.hero-badge {
  background: rgba(0,180,216,0.06);
  border: 1px solid rgba(0,180,216,0.25);
  color: rgba(255,255,255,.8); padding: 5px 14px; border-radius: 4px; font-size: 0.82rem;
  transition: all .3s;
  backdrop-filter: blur(8px);
  font-family: 'Courier New', monospace;
  letter-spacing: 0.3px;
  position: relative;
}
.hero-badge::before {
  content: '';
  position: absolute; top: 0; left: 0;
  width: 3px; height: 100%;
  background: linear-gradient(to bottom, var(--electric), var(--teal));
  border-radius: 4px 0 0 4px;
}
.hero-badge:hover {
  background: rgba(0,180,216,0.15);
  border-color: rgba(0,180,216,0.5);
  color: var(--electric);
  box-shadow: 0 0 16px rgba(0,180,216,0.3);
}
.sci-icon {
  font-family: monospace;
  color: var(--teal);
  font-size: 1em;
  margin-right: 2px;
}

.hero-cta {
  display: flex; gap: 16px; flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 16px;
  overflow: hidden;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  animation: fadeInUp 0.8s ease 0.5s both;
  margin-top: 64px;
}
.hero-stat {
  padding: 24px 20px; text-align: center;
  background: rgba(255,255,255,.08);
  transition: background .3s;
}
.hero-stat:hover { background: rgba(255,255,255,.16); }
.hero-stat-num {
  font-size: 2.2rem; font-weight: 800; line-height: 1;
  background: linear-gradient(135deg, #60a5fa, #93c5fd);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-stat-label { font-size: 0.8rem; color: rgba(255,255,255,.6); margin-top: 6px; }

/* ==============================================
   PAGE HEADER (inner pages)
   ============================================== */
.page-header {
  background: linear-gradient(135deg, #162ba8 0%, #1e3cc5 55%, #2040be 100%);
  color: #fff; padding: 56px 0 0;
  position: relative; overflow: hidden;
}
.page-header-skyline {
  position: absolute; top: 0; left: 0; right: 0;
  height: 100%; width: 100%;
  background-image: url('/images/wave-bg.svg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  pointer-events: none;
}
.page-header .container { position: relative; z-index: 1; padding-bottom: 48px; }
.page-header h1 {
  color: #fff; font-size: 2.4rem; margin-bottom: 10px; font-weight: 800;
}
.page-header .lead { color: rgba(255,255,255,.75); font-size: 1.05rem; }

/* ==============================================
   SECTIONS
   ============================================== */
.section { padding: 80px 0; }
.section-dark { background: #f8fafc; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-alt { background: var(--bg-section); }
.section-title {
  text-align: center; margin-bottom: 56px;
}
.section-title h2 {
  font-size: 2rem; color: var(--zju-blue);
  display: inline-block; position: relative; padding-bottom: 14px;
  font-weight: 800;
}
.section-title h2::after {
  content: '';
  position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 50px; height: 3px;
  background: linear-gradient(90deg, var(--electric), var(--teal));
  border-radius: 2px;
}
.section-title p { color: var(--text-muted); margin-top: 16px; max-width: 580px; margin-left: auto; margin-right: auto; font-size: 1.02rem; }

.section-title.dark h2 { color: var(--zju-blue); }
.section-title.dark p { color: var(--text-muted); }

/* ==============================================
   BUTTONS
   ============================================== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 10px;
  font-weight: 600; transition: all .25s; cursor: pointer; text-align: center;
  font-family: var(--font-sans); font-size: 0.95rem;
  border: none; letter-spacing: .2px;
}
.btn-primary {
  background: var(--electric);
  color: #fff; border: none;
  box-shadow: 0 2px 12px rgba(37,99,235,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  background: var(--accent-2);
  box-shadow: 0 6px 20px rgba(37,99,235,0.4);
  color: #fff; text-decoration: none;
}
.btn-outline {
  background: transparent;
  color: rgba(255,255,255,.85);
  border: 1.5px solid rgba(255,255,255,.25);
  backdrop-filter: blur(8px);
}
.btn-outline:hover {
  background: rgba(255,255,255,.1);
  border-color: rgba(255,255,255,.5);
  color: #fff; text-decoration: none;
  transform: translateY(-2px);
}
.btn-outline-blue {
  background: transparent; color: var(--zju-blue);
  border: 2px solid var(--zju-blue);
}
.btn-outline-blue:hover {
  background: var(--zju-blue); color: #fff; text-decoration: none;
}
.btn-ghost {
  background: rgba(37,99,235,0.06);
  color: var(--electric);
  border: 1px solid rgba(37,99,235,0.2);
}
.btn-ghost:hover {
  background: rgba(37,99,235,0.12);
  border-color: var(--electric);
  color: var(--electric); text-decoration: none;
}

/* ==============================================
   CARDS
   ============================================== */
.card {
  background: #fff; border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
  transition: box-shadow .3s, transform .3s;
  border: 1px solid rgba(0,0,0,.06);
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.card-body { padding: 28px; }
.card-title { font-size: 1.1rem; color: var(--zju-blue); margin-bottom: 10px; }
.card-text { color: var(--text-muted); font-size: 0.9rem; line-height: 1.65; }

/* Glass card (for dark sections) */
.glass-card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all .3s;
}
.glass-card:hover {
  background: rgba(255,255,255,.07);
  border-color: rgba(0,180,216,0.3);
  box-shadow: 0 0 30px rgba(0,180,216,0.15);
  transform: translateY(-4px);
}

/* ==============================================
   GRID UTILITIES
   ============================================== */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(auto-fill, minmax(480px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }

/* ==============================================
   STATS SECTION
   ============================================== */
.stats-section {
  background: var(--bg-section);
  padding: 72px 0;
  position: relative; overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stats-section::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(37,99,235,0.04) 0%, rgba(59,130,246,0.02) 100%);
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px;
  position: relative; z-index: 1;
}
.stat-item {
  text-align: center; padding: 40px 24px;
  position: relative;
}
.stat-item::after {
  content: '';
  position: absolute; right: 0; top: 20%; bottom: 20%;
  width: 1px; background: var(--border);
}
.stat-item:last-child::after { display: none; }
.stat-number {
  font-size: 3.2rem; font-weight: 800; line-height: 1;
  background: linear-gradient(135deg, var(--electric), var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  display: block;
}
.stat-suffix { font-size: 1.8rem; }
.stat-label { font-size: 0.92rem; color: var(--text); margin-top: 10px; letter-spacing: .3px; font-weight: 600; }
.stat-sublabel { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }

/* Stat card (bordered style) */
.stat-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,.06);
  padding: 28px 24px 28px 28px;
  transition: box-shadow .3s;
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(135deg, var(--electric), var(--accent-2));
}
.stat-card:hover { box-shadow: var(--shadow-lg); }
.stat-card .stat-number {
  font-size: 2.8rem; font-weight: 800; line-height: 1;
  background: linear-gradient(135deg, var(--electric), var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  display: block;
}
.stat-card .stat-label {
  font-size: 1rem; margin-top: 10px; font-weight: 600; letter-spacing: .3px;
  background: linear-gradient(135deg, var(--electric), var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  display: inline-block;
}
.stat-card .stat-desc {
  font-size: 0.8rem; color: var(--text-muted); margin-top: 8px; line-height: 1.55;
}

/* ==============================================
   RESEARCH CARDS
   ============================================== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.research-card-modern {
  background: #fff;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: all .3s;
  overflow: hidden;
  display: flex; flex-direction: column;
}
.research-card-modern:hover {
  box-shadow: 0 10px 32px rgba(37,99,235,0.13);
  transform: translateY(-4px);
  border-color: rgba(37,99,235,0.2);
}
.research-card-img {
  width: 100%; height: 200px;
  overflow: hidden; flex-shrink: 0;
}
.research-card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .4s;
  display: block;
}
.research-card-modern:hover .research-card-img img {
  transform: scale(1.05);
}
.research-card-body {
  padding: 24px 22px 20px;
  display: flex; flex-direction: column; flex: 1;
}
.research-card-body h3 {
  font-size: 1rem; color: var(--zju-blue);
  margin-bottom: 10px; font-weight: 700;
  line-height: 1.4;
}
.research-card-body p {
  font-size: 0.88rem; color: var(--text-muted);
  line-height: 1.65; flex: 1;
}
.research-card-link {
  display: inline-block; margin-top: 16px;
  font-size: 0.88rem; font-weight: 600;
  color: var(--electric); text-decoration: none;
  transition: color .2s;
}
.research-card-link:hover { color: var(--accent-2); text-decoration: none; }

/* ==============================================
   PLATFORMS SECTION
   ============================================== */
.platform-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all .3s;
  position: relative; overflow: hidden;
  box-shadow: var(--shadow);
}
.platform-card::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--electric), var(--teal));
  opacity: 0; transition: opacity .3s;
}
.platform-card:hover::after { opacity: 1; }
.platform-card:hover {
  border-color: rgba(37,99,235,0.25);
  box-shadow: 0 8px 32px rgba(37,99,235,0.12);
  transform: translateY(-4px);
}
.platform-number {
  font-size: 3rem; font-weight: 900; line-height: 1;
  background: linear-gradient(135deg, var(--electric) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 12px; opacity: .6;
}
.platform-card h3 { color: var(--zju-blue); font-size: 1.1rem; margin-bottom: 10px; }
.platform-card p { color: var(--text-muted); font-size: 0.88rem; line-height: 1.65; }

/* ==============================================
   NEWS SECTION
   ============================================== */
.news-item {
  padding: 18px 0; border-bottom: 1px solid var(--border);
  transition: all .2s;
}
.news-item:last-child { border: none; }
.news-item:hover { padding-left: 6px; }
.news-date {
  font-size: 0.78rem; color: var(--electric); font-weight: 700;
  letter-spacing: .5px; text-transform: uppercase; margin-bottom: 4px;
}
.news-title { font-size: 0.95rem; color: var(--text); line-height: 1.5; }
.news-title a { color: var(--text); }
.news-title a:hover { color: var(--electric); }

/* ==============================================
   PUBLICATIONS
   ============================================== */
.pub-filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.filter-btn {
  padding: 7px 18px; border: 1.5px solid var(--border); border-radius: 20px;
  background: #fff; cursor: pointer; font-size: 0.84rem; transition: all .2s;
  font-family: var(--font-sans); color: var(--text-muted);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--zju-blue); color: #fff; border-color: var(--zju-blue);
  box-shadow: 0 4px 15px rgba(0,48,135,0.25);
}

.pub-item {
  padding: 22px 26px; background: #fff; border-radius: var(--radius);
  box-shadow: var(--shadow); margin-bottom: 14px;
  border-left: 4px solid transparent;
  background-image: linear-gradient(#fff, #fff),
    linear-gradient(to bottom, var(--electric), var(--teal));
  background-origin: border-box; background-clip: padding-box, border-box;
  border-left: 4px solid;
  border-image: linear-gradient(to bottom, var(--electric), var(--teal)) 1;
  transition: all .25s;
}
.pub-item:hover { box-shadow: 0 8px 30px rgba(0,180,216,0.12); transform: translateX(4px); }
.pub-title { font-weight: 700; font-size: 1rem; color: var(--zju-blue); margin-bottom: 6px; }
.pub-authors { font-size: 0.88rem; color: var(--text); margin-bottom: 4px; }
.pub-venue { font-size: 0.88rem; color: var(--text-muted); font-style: italic; }
.pub-meta { display: flex; gap: 10px; margin-top: 8px; flex-wrap: wrap; }
.pub-tag {
  font-size: 0.77rem; padding: 2px 10px; border-radius: 12px;
  background: var(--bg-section); color: var(--text-muted);
}
.pub-tag.year { background: rgba(0,180,216,0.1); color: var(--electric); font-weight: 600; }
.pub-links { display: flex; gap: 8px; margin-top: 10px; }
.pub-link {
  font-size: 0.8rem; padding: 4px 14px; border-radius: 6px;
  border: 1px solid var(--electric); color: var(--electric);
  transition: all .2s;
}
.pub-link:hover { background: var(--electric); color: #fff; box-shadow: 0 0 15px rgba(0,180,216,0.3); }

/* ==============================================
   ABOUT PAGE
   ============================================== */
.about-pi {
  display: grid; grid-template-columns: 260px 1fr; gap: 48px; align-items: start;
}
.about-pi-photo {
  border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: 0 0 0 4px rgba(0,180,216,0.2), 0 20px 50px rgba(0,0,0,.15);
  position: relative;
}
.about-pi-photo::before {
  content: '';
  position: absolute; inset: -3px;
  background: linear-gradient(135deg, var(--electric), var(--teal));
  border-radius: calc(var(--radius-lg) + 3px);
  z-index: -1;
}
.about-pi-photo img { width: 100%; }
.about-pi-info h2 { font-size: 2rem; margin-bottom: 4px; }
.about-pi-info .title {
  font-size: 1rem; font-weight: 600; margin: 6px 0 6px;
  background: linear-gradient(135deg, var(--electric), var(--teal));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.about-pi-info .subtitle { color: var(--text-muted); font-size: 0.92rem; margin-bottom: 20px; }
.about-contact { list-style: none; }
.about-contact li {
  display: flex; gap: 10px; align-items: center;
  margin-bottom: 10px; color: var(--text-muted); font-size: 0.95rem;
}
.about-contact li i { color: var(--electric); width: 20px; font-style: normal; }

.award-item {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 14px 18px;
  background: var(--bg-light); border-radius: 10px; margin-bottom: 10px;
  border-left: 3px solid var(--electric);
  transition: all .2s;
}
.award-item:hover { background: rgba(0,180,216,0.05); transform: translateX(4px); }
.award-year {
  font-size: 0.8rem; font-weight: 700; color: var(--electric);
  white-space: nowrap; padding-top: 2px;
}
.award-text { font-size: 0.92rem; color: var(--text); }

.research-directions { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.research-directions li {
  padding: 12px 16px;
  background: linear-gradient(135deg, rgba(0,180,216,0.06), rgba(6,214,160,0.06));
  border: 1px solid rgba(0,180,216,0.15);
  border-radius: 10px; font-size: 0.9rem; color: var(--text);
  transition: all .2s;
}
.research-directions li:hover {
  background: linear-gradient(135deg, rgba(0,180,216,0.12), rgba(6,214,160,0.12));
  border-color: rgba(0,180,216,0.35);
}

/* Editorial roles */
.role-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 20px; font-size: 0.84rem;
  background: rgba(0,48,135,0.08);
  color: var(--zju-blue); border: 1px solid rgba(0,48,135,0.15);
  margin: 4px;
}

/* ==============================================
   PEOPLE PAGE
   ============================================== */
.people-group { margin-bottom: 60px; }
.people-group-title {
  font-size: 1.4rem; color: var(--dark);
  padding-bottom: 12px; margin-bottom: 28px;
  display: flex; align-items: center; gap: 12px;
}
.people-group-title::after {
  content: '';
  flex: 1; height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}
.people-group-title .group-count {
  font-size: 0.8rem; font-weight: 600; padding: 3px 10px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(0,180,216,0.1), rgba(6,214,160,0.1));
  color: var(--electric); border: 1px solid rgba(0,180,216,0.2);
}

.person-card { text-align: center; }
.person-photo-wrap {
  position: relative; width: 110px; height: 110px;
  margin: 0 auto 16px;
}
.person-photo-ring {
  position: absolute; inset: -3px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--electric), var(--teal));
  opacity: 0; transition: opacity .3s;
}
.person-card:hover .person-photo-ring { opacity: 1; }
.person-photo {
  width: 110px; height: 110px; border-radius: 50%; overflow: hidden;
  background: var(--bg-section);
  position: relative; z-index: 1;
  border: 3px solid rgba(255,255,255,.8);
}
.person-photo img { width: 100%; height: 100%; object-fit: cover; }
.person-photo .placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; font-weight: 700; color: var(--electric);
  background: linear-gradient(135deg, rgba(0,180,216,0.1), rgba(6,214,160,0.1));
}
.person-name { font-weight: 700; font-size: 1.05rem; color: var(--zju-blue); }
.person-role { font-size: 0.82rem; color: var(--electric); margin-top: 4px; font-weight: 500; }
.person-research { font-size: 0.82rem; color: var(--text-muted); margin-top: 6px; padding: 0 8px; line-height: 1.5; }

/* ==============================================
   EQUIPMENT PAGE
   ============================================== */
.equipment-card { }
.equipment-card .card-img { height: 200px; overflow: hidden; background: var(--bg-section); border-radius: var(--radius) var(--radius) 0 0; }
.equipment-card .card-img img { width: 100%; height: 100%; object-fit: cover; }
.equipment-card .card-img .img-placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
  background: linear-gradient(135deg, rgba(0,180,216,0.08), rgba(6,214,160,0.08));
}
.equipment-specs { list-style: none; margin-top: 12px; }
.equipment-specs li { font-size: 0.85rem; color: var(--text-muted); padding: 4px 0; border-bottom: 1px solid var(--bg-section); }
.equipment-specs li:last-child { border: none; }
.equipment-specs strong { color: var(--text); }

/* ==============================================
   TIMELINE
   ============================================== */
.timeline { position: relative; padding-left: 36px; }
.timeline::before {
  content: ''; position: absolute; left: 10px; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--electric), var(--teal));
}
.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item::before {
  content: ''; position: absolute; left: -30px; top: 6px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--dark);
  border: 2px solid var(--electric);
  box-shadow: 0 0 12px rgba(0,180,216,0.6);
  animation: glow 2.5s ease-in-out infinite;
  z-index: 1;
}
.timeline-date { font-size: 0.82rem; color: var(--electric); font-weight: 700; letter-spacing: .5px; text-transform: uppercase; }
.timeline-title { font-size: 1rem; font-weight: 700; color: var(--zju-blue); margin: 4px 0; }
.timeline-body { font-size: 0.9rem; color: var(--text); }

/* ==============================================
   QZ INSTITUTE
   ============================================== */
.institute-intro {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start;
}
.institute-intro .intro-text h2 { font-size: 1.7rem; }
.institute-intro .intro-img { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }

/* ==============================================
   FOOTER
   ============================================== */
.footer {
  background: var(--dark); color: rgba(255,255,255,.65);
  padding: 56px 0 28px;
  border-top: 1px solid rgba(255,255,255,.06);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer h4 { color: rgba(255,255,255,.9); margin-bottom: 18px; font-size: 0.95rem; letter-spacing: .5px; }
.footer a { color: rgba(255,255,255,.5); font-size: 0.88rem; transition: color .2s; }
.footer a:hover { color: #93c5fd; text-decoration: none; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.07);
  padding-top: 24px; text-align: center;
  font-size: 0.82rem; color: rgba(255,255,255,.3);
}
.footer-brand-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 8px;
  background: rgba(37,99,235,0.15);
  border: 1px solid rgba(37,99,235,0.3);
  color: #93c5fd; font-size: 0.82rem; font-weight: 600;
  margin-bottom: 16px; display: inline-block;
}

/* ==============================================
   QUICK NAV CARDS
   ============================================== */
.quick-nav-card {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px; padding: 32px 20px;
  background: #fff; border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,.06);
  text-decoration: none; color: inherit;
  transition: all .3s;
  position: relative; overflow: hidden;
}
.quick-nav-card::before {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--electric), var(--teal));
  transform: scaleX(0); transform-origin: center;
  transition: transform .3s;
}
.quick-nav-card:hover::before { transform: scaleX(1); }
.quick-nav-card:hover { box-shadow: 0 12px 40px rgba(0,180,216,0.15); transform: translateY(-5px); text-decoration: none; color: inherit; }
.quick-nav-icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.7rem;
  background: linear-gradient(135deg, rgba(0,180,216,0.1), rgba(6,214,160,0.1));
  border: 1px solid rgba(0,180,216,0.15);
  transition: all .3s;
}
.quick-nav-card:hover .quick-nav-icon {
  background: linear-gradient(135deg, rgba(0,180,216,0.2), rgba(6,214,160,0.2));
  box-shadow: 0 0 20px rgba(0,180,216,0.3);
}
.quick-nav-label { font-size: 0.95rem; font-weight: 600; color: var(--zju-blue); }

/* ==============================================
   RESEARCH DETAIL PAGE
   ============================================== */
.research-detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 32px;
  margin-top: 16px;
}
.research-detail-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: box-shadow .3s, transform .3s;
}
.research-detail-card:hover {
  box-shadow: 0 10px 32px rgba(37,99,235,0.12);
  transform: translateY(-3px);
}
.research-detail-img {
  width: 100%; height: 220px; overflow: hidden; flex-shrink: 0;
}
.research-detail-img img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .4s;
}
.research-detail-card:hover .research-detail-img img { transform: scale(1.04); }
.research-detail-body {
  padding: 28px 26px 24px;
  flex: 1;
}
.research-detail-body h3 {
  font-size: 1.1rem; font-weight: 700;
  color: var(--zju-blue); margin-bottom: 12px;
  border-left: 3px solid var(--electric);
  padding-left: 12px; line-height: 1.4;
}
.research-detail-body p {
  font-size: 0.92rem; color: var(--text-muted);
  line-height: 1.7; margin-bottom: 14px;
}
.research-detail-body ul {
  padding-left: 18px; margin: 0;
}
.research-detail-body ul li {
  font-size: 0.88rem; color: var(--text);
  margin-bottom: 6px; line-height: 1.5;
}
@media (max-width: 960px) {
  .research-detail-grid { grid-template-columns: 1fr; }
}

/* ==============================================
   SPINOFF COMPANIES
   ============================================== */
.spinoff-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px;
}
.spinoff-card {
  padding: 24px; border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--border);
  transition: all .3s;
}
.spinoff-card:hover {
  background: rgba(79,142,247,.06);
  border-color: rgba(79,142,247,.35);
  box-shadow: 0 0 30px rgba(79,142,247,.1);
}
.spinoff-card h4 { color: #2563eb; font-size: 0.95rem; margin-bottom: 6px; }
.spinoff-card p { color: #4b5563; font-size: 0.85rem; }

/* ==============================================
   RESPONSIVE
   ============================================== */
@media (max-width: 1024px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 960px) {
  .nav-links {
    display: none; position: absolute; top: var(--nav-height); left: 0; right: 0;
    background: rgba(255,255,255,0.97); backdrop-filter: blur(20px);
    flex-direction: column; padding: 16px; gap: 4px;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .about-pi { grid-template-columns: 1fr; }
  .about-pi-photo { width: 200px; margin: 0 auto; }
  .research-directions { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .institute-intro { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding: 80px 0 60px; }
}

@media (max-width: 640px) {
  .hero h1 { font-size: 1.9rem; }
  .section { padding: 56px 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item::after { display: none; }
}