/* ============================================================
   Academic Homepage — Style Sheet
   File: css/style.css
   ============================================================ */

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

:root {
  --color-primary: #1a2332;
  --color-secondary: #2d4a7a;
  --color-accent: #3b6cb4;
  --color-accent-light: #e8f0fe;
  --color-text: #2c3e50;
  --color-text-light: #5a6c7d;
  --color-text-muted: #8895a4;
  --color-bg: #fafbfc;
  --color-white: #ffffff;
  --color-border: #e4e8ec;
  --color-card: #ffffff;
  --color-highlight: #0066cc;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Crimson Pro', 'Georgia', serif;
  --max-width: 680px;
  --page-width: 680px;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  max-width: var(--page-width);
  margin: 0 auto;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--color-highlight);
}

/* ===== Navigation ===== */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
  width: 100%;
}

.nav-inner {
  width: 100%;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 0.01em;
  position: relative;
}

.nav-links a:hover {
  color: var(--color-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.3s ease;
  border-radius: 1px;
}

.nav-links a:hover::after {
  width: 100%;
}

/* ===== Layout ===== */
.container {
  width: 100%;
  padding: 0 2rem;
}

/* ===== Hero Section ===== */
.hero {
  padding-top: 80px;
  padding-bottom: 4rem;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, #f0f4f8 0%, #e8f0fe 50%, #f5f0ff 100%);
  border-radius: 0 0 var(--radius) var(--radius);
  z-index: -1;
}

.hero-content {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
}

.hero-photo {
  flex-shrink: 0;
}

.hero-photo img {
  width: 150px;
  height: 195px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 4px solid var(--color-white);
}

.hero-info {
  flex: 1;
  padding-top: 0.5rem;
}

.hero-name {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.15rem;
}

.hero-name-cn {
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-secondary);
  margin-bottom: 0.25rem;
}

.hero-affiliation {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 1.2rem;
}

.hero-email {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 1.2rem;
}

.hero-email strong {
  color: var(--color-text);
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.8rem;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.hero-links a:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.hero-links a .link-icon {
  font-size: 0.8rem;
}

/* ===== Sections ===== */
.section {
  padding: 3rem 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  padding-bottom: 0.6rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-secondary));
  border-radius: 2px;
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

/* ===== About / Bio ===== */
.bio-text {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.85;
  color: var(--color-text);
  max-width: 760px;
}

.bio-text a {
  border-bottom: 1px solid var(--color-accent-light);
}

.bio-text a:hover {
  border-bottom-color: var(--color-accent);
}

/* ===== Research Interests ===== */
.interests-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.interest-tag {
  padding: 0.4rem 1.1rem;
  background: var(--color-accent-light);
  color: var(--color-secondary);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* ===== Recruiting ===== */
.recruit-box {
  background: linear-gradient(135deg, #eef3ff 0%, #f0e8ff 100%);
  border: 1px solid #d4dffa;
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  font-size: 0.95rem;
  color: var(--color-secondary);
  line-height: 1.6;
}

.recruit-box .icon {
  margin-right: 0.4rem;
}

/* ===== Slider (shared by News & Awards) ===== */
.section-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.2rem;
}

.section-header-row .section-title {
  margin-bottom: 0;
}

.slider-nav {
  display: flex;
  gap: 0.4rem;
}

.slider-btn {
  width: 34px;
  height: 34px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-white);
  color: var(--color-text);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.slider-btn:hover:not(:disabled) {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.slider-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.slider-wrapper {
  overflow: hidden;
  position: relative;
}

.slider-track {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 0.5rem;
  scrollbar-width: none; /* Firefox */
}

.slider-track::-webkit-scrollbar {
  display: none; /* Chrome / Safari */
}

.slider-card {
  flex: 0 0 200px;
  scroll-snap-align: start;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
  transition: var(--transition);
}

.slider-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #c8d6e5;
  transform: translateY(-2px);
}

/* ===== News (inside slider) ===== */
.news-date {
  display: inline-block;
  font-weight: 600;
  color: var(--color-accent);
  font-size: 0.82rem;
  margin-bottom: 0.5rem;
  padding: 0.15rem 0.6rem;
  background: var(--color-accent-light);
  border-radius: 100px;
}

.news-text {
  color: var(--color-text);
  font-size: 0.92rem;
  line-height: 1.55;
}

/* ===== Publications ===== */
.pub-note {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.pub-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: var(--transition);
}

.pub-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #c8d6e5;
  transform: translateY(-2px);
}

.pub-authors {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 0.3rem;
  line-height: 1.5;
}

.pub-authors .me {
  font-weight: 600;
  color: var(--color-primary);
}

.pub-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.3rem;
  line-height: 1.4;
}

.pub-venue {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.6rem;
}

.pub-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pub-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.7rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-light);
  transition: var(--transition);
}

.pub-link:hover {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.pub-citation {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.7rem;
  background: #fff7e6;
  border: 1px solid #ffe0b2;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #e67e22;
}

/* ===== Services ===== */
.service-group {
  margin-bottom: 1.2rem;
}

.service-label {
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}

.service-text {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ===== Awards (inside slider) ===== */
.award-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
}

.award-icon {
  font-size: 1.5rem;
  margin-bottom: 0.2rem;
}

.award-name {
  color: var(--color-text);
  font-weight: 600;
  font-size: 0.92rem;
  line-height: 1.4;
}

.award-year {
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

/* ===== Liang Lab ===== */
.lab-header {
  margin-bottom: 0.5rem;
}

.lab-title {
  display: block;
}

.lab-title::after {
  width: 60px;
}

.lab-name-full {
  font-size: 1.45rem;
  letter-spacing: -0.01em;
}

.lab-name-full .hl {
  color: var(--color-accent);
  font-weight: 800;
  position: relative;
}

.lab-name-short {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-left: 0.3rem;
}

.lab-group {
  margin-bottom: 1.8rem;
}

.lab-group:last-child {
  margin-bottom: 0;
}

.lab-group-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px dashed var(--color-border);
}

.lab-members-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem;
}

.lab-member-card {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.7rem 0.9rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: var(--transition);
}

.lab-member-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #c8d6e5;
  transform: translateY(-2px);
}

.member-avatar {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent-light), #e0d4f7);
  color: var(--color-secondary);
  font-weight: 700;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.02em;
}

.member-info {
  flex: 1;
  min-width: 0;
}

.member-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.3;
}

.member-name a {
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.member-name a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.member-period {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.15rem;
}

.member-links {
  margin-top: 0.4rem;
}

.member-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.55rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-text-light);
  transition: var(--transition);
}

.member-links a:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* ===== Lab Standalone Page ===== */
.lab-hero {
  padding-top: 60px;
  padding-bottom: 2.5rem;
}

.lab-hero::before {
  height: 200px;
}

.lab-page-header {
  text-align: center;
  padding-top: 1.5rem;
}

.lab-page-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 0.4rem;
}

.lab-page-title .hl {
  color: var(--color-accent);
  font-weight: 800;
}

.lab-page-subtitle {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* Leader Card */
.leader-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: var(--transition);
}

.leader-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #c8d6e5;
}

.leader-photo {
  flex-shrink: 0;
}

.leader-photo img {
  width: 90px;
  height: 90px;
  object-fit: cover;
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  border: 3px solid var(--color-white);
}

.leader-info {
  flex: 1;
}

.leader-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.2rem;
}

.leader-name a {
  color: var(--color-primary);
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.leader-name a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.leader-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-secondary);
  margin-bottom: 0.15rem;
}

.leader-affiliation {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.6rem;
}

.leader-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.leader-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-text-light);
  transition: var(--transition);
}

.leader-links a:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* ===== Visitor Map ===== */
.visitor-map-section {
  padding: 2rem 0 1rem;
  border-top: 1px solid var(--color-border);
}

.visitor-map-wrapper {
  text-align: center;
}

.visitor-map-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
  margin-bottom: 1rem;
}

.visitor-map-content {
  display: inline-block;
  width: fit-content;
  max-width: 100%;
  padding: 0;
  line-height: 0;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.visitor-map-content > div,
.visitor-map-content iframe,
.visitor-map-content canvas,
.visitor-map-content img {
  display: block;
  max-width: 100%;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  body {
    max-width: 100%;
  }

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

  .hero-links {
    justify-content: center;
  }

  .hero-name {
    font-size: 1.8rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-links a {
    font-size: 0.8rem;
  }

  .container {
    padding: 0 1.2rem;
  }

  .slider-card {
    flex: 0 0 200px;
  }

  .lab-members-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== 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);
}