/* ===================================================================
   BMAL Lab — Biomedical Multimodal Analysis Laboratory
   Design: dark-navy / cyan / violet scientific theme
=================================================================== */

:root {
  --bg0:        #050d1a;
  --bg1:        #081528;
  --bg2:        #0d2040;
  --card:       rgba(13, 32, 64, 0.75);
  --card-border:rgba(0, 212, 255, 0.18);
  --cyan:       #00d4ff;
  --cyan-dim:   rgba(0, 212, 255, 0.15);
  --violet:     #a855f7;
  --violet-dim: rgba(168, 85, 247, 0.15);
  --green:      #10b981;
  --text:       #e2e8f0;
  --text-dim:   #94a3b8;
  --text-muted: #5a7096;
  --radius:     12px;
  --radius-lg:  20px;
  --nav-height: 68px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--bg0);
  color: var(--text);
  font-family: 'Inter', 'Noto Sans TC', system-ui, sans-serif;
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}

::selection { background: var(--cyan-dim); color: var(--cyan); }
a { color: var(--cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: #fff; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ── Scrollbar ─────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg1); }
::-webkit-scrollbar-thumb { background: var(--bg2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,212,255,0.4); }

/* ── Typography ────────────────────────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-family: 'Space Grotesk', 'Noto Sans TC', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  color: #fff;
}
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }

.text-cyan   { color: var(--cyan); }
.text-violet { color: var(--violet); }
.text-green  { color: var(--green); }
.text-dim    { color: var(--text-dim); }
.text-muted  { color: var(--text-muted); }

/* ── Utilities ─────────────────────────────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 1.5rem; }

.section { padding: 100px 0; }
.section-sm { padding: 60px 0; }

.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { margin-bottom: 0.5rem; }
.section-header p { color: var(--text-dim); max-width: 640px; margin: 0.75rem auto 0; font-size: 1.05rem; }

.section-line {
  display: flex; align-items: center; gap: 12px; justify-content: center;
  margin-bottom: 12px;
}
.section-line::before,
.section-line::after {
  content: ''; flex: 1; max-width: 80px;
  height: 1px; background: linear-gradient(90deg, transparent, var(--cyan));
}
.section-line::after { background: linear-gradient(90deg, var(--cyan), transparent); }
.section-tag {
  font-size: 0.7rem; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--cyan); font-weight: 600;
}

.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px; border-radius: 999px; font-size: 0.72rem;
  font-weight: 600; letter-spacing: 0.05em;
}
.badge-cyan    { background: var(--cyan-dim);   color: var(--cyan);   border: 1px solid rgba(0,212,255,0.25); }
.badge-violet  { background: var(--violet-dim); color: var(--violet); border: 1px solid rgba(168,85,247,0.25); }
.badge-green   { background: rgba(16,185,129,0.12); color: var(--green); border: 1px solid rgba(16,185,129,0.25); }
.badge-orange  { background: rgba(251,146,60,0.12); color: #fb923c; border: 1px solid rgba(251,146,60,0.25); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 0.65rem 1.5rem; border-radius: var(--radius);
  font-weight: 600; font-size: 0.9rem; cursor: pointer;
  border: none; transition: all var(--transition); letter-spacing: 0.02em;
}
.btn-primary {
  background: linear-gradient(135deg, var(--cyan) 0%, #0088cc 100%);
  color: #000; box-shadow: 0 0 24px rgba(0,212,255,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 36px rgba(0,212,255,0.5); color: #000; }
.btn-outline {
  background: transparent; color: var(--cyan);
  border: 1.5px solid var(--cyan);
}
.btn-outline:hover { background: var(--cyan-dim); }
.btn-ghost { background: rgba(255,255,255,0.06); color: var(--text); }
.btn-ghost:hover { background: rgba(255,255,255,0.1); }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ── Glass Card ────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition);
  overflow: hidden;
}
.card:hover {
  border-color: rgba(0,212,255,0.4);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,212,255,0.08), 0 0 0 1px rgba(0,212,255,0.1);
}

/* ── Navbar ────────────────────────────────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-height); z-index: 1000;
  transition: all var(--transition);
}
.navbar.scrolled {
  background: rgba(5, 13, 26, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
  box-shadow: 0 4px 30px rgba(0,0,0,0.4);
}
.navbar .container {
  height: 100%; display: flex; align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center; gap: 12px;
  color: #fff; font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 1.1rem;
}
.nav-logo .logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; color: #fff; font-weight: 800;
  box-shadow: 0 0 20px rgba(0,212,255,0.4);
}
.nav-logo .logo-text { line-height: 1.1; }
.nav-logo .logo-abbr { font-size: 0.65rem; color: var(--cyan); letter-spacing: 0.1em; display: block; }

.nav-links {
  display: flex; align-items: center; gap: 4px;
}
.nav-links a {
  color: var(--text-dim); font-size: 0.875rem; font-weight: 500;
  padding: 6px 14px; border-radius: 8px;
  transition: all var(--transition);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--cyan); background: var(--cyan-dim);
}

.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: all var(--transition); }

/* ── Hero ──────────────────────────────────────────────────────── */
#hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden;
}
#hero-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
}
.hero-gradient {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(0,212,255,0.06) 0%, transparent 70%),
              radial-gradient(ellipse 60% 50% at 80% 20%, rgba(168,85,247,0.05) 0%, transparent 60%),
              linear-gradient(180deg, transparent 60%, var(--bg0) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 780px;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--cyan-dim); border: 1px solid rgba(0,212,255,0.3);
  border-radius: 999px; padding: 5px 16px 5px 12px;
  font-size: 0.8rem; font-weight: 600; color: var(--cyan);
  letter-spacing: 0.05em; margin-bottom: 1.5rem;
}
.hero-eyebrow .dot { width: 7px; height: 7px; background: var(--cyan); border-radius: 50%; animation: pulse 2s infinite; }
.hero-title { margin-bottom: 1.25rem; }
.hero-title .grad {
  background: linear-gradient(135deg, var(--cyan) 0%, #4af0ff 30%, var(--violet) 70%, #d096ff 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle { font-size: 1.15rem; color: var(--text-dim); margin-bottom: 2rem; max-width: 600px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 3rem; }
.hero-stats {
  display: flex; gap: 32px; flex-wrap: wrap;
  padding-top: 2rem; border-top: 1px solid rgba(255,255,255,0.06);
}
.hero-stat .val { font-size: 1.8rem; font-weight: 800; color: #fff; line-height: 1; }
.hero-stat .lbl { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }

/* ── About/Research Areas ──────────────────────────────────────── */
.research-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.research-item {
  padding: 1.5rem; border-radius: var(--radius-lg);
  background: var(--card); border: 1px solid var(--card-border);
  transition: all var(--transition);
}
.research-item:hover { border-color: rgba(0,212,255,0.4); transform: translateY(-3px); }
.research-icon {
  width: 44px; height: 44px; border-radius: 12px; margin-bottom: 1rem;
  display: flex; align-items: center; justify-content: center; font-size: 1.3rem;
  background: linear-gradient(135deg, var(--cyan-dim), var(--violet-dim));
  border: 1px solid var(--card-border);
}
.research-item h4 { margin-bottom: 0.5rem; font-size: 0.95rem; }
.research-item p  { font-size: 0.82rem; color: var(--text-dim); }

/* ── News ──────────────────────────────────────────────────────── */
.news-card { padding: 1.25rem 1.5rem; display: flex; gap: 1rem; }
.news-card:hover { background: rgba(0,212,255,0.04); }
.news-date-badge {
  min-width: 54px; text-align: center;
  background: var(--cyan-dim); border: 1px solid rgba(0,212,255,0.2);
  border-radius: 10px; padding: 6px 4px;
  flex-shrink: 0;
}
.news-date-badge .month { font-size: 0.65rem; color: var(--cyan); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
.news-date-badge .day   { font-size: 1.3rem; font-weight: 800; color: #fff; line-height: 1; }
.news-date-badge .year  { font-size: 0.6rem; color: var(--text-muted); }
.news-body h4 { font-size: 0.9rem; color: #fff; margin-bottom: 4px; font-weight: 600; }
.news-body p  { font-size: 0.8rem; color: var(--text-dim); }
.news-type-icon { font-size: 0.75rem; margin-right: 4px; }

/* ── Members ───────────────────────────────────────────────────── */
/* 自動欄數成員格線：每張卡最窄 200px，自動填滿列寬，人數不限 */
.grid-members {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

/* 年份分組小標題 */
.member-cohort-label {
  font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-muted); font-weight: 600;
  margin: 16px 0 12px;
}

.member-group-title {
  font-size: 0.7rem; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--cyan); font-weight: 700;
  padding: 8px 0 16px;
  border-bottom: 1px solid var(--card-border);
  margin-bottom: 24px;
}
.member-card { text-align: center; padding: 2rem 1.5rem; }
.member-photo-wrap {
  position: relative; width: 100px; height: 100px;
  margin: 0 auto 1.25rem;
}
.member-photo {
  width: 100px; height: 100px;
  border-radius: 50%; object-fit: cover;
  border: 2.5px solid var(--card-border);
  transition: all var(--transition);
}
.member-card:hover .member-photo { border-color: var(--cyan); box-shadow: 0 0 20px rgba(0,212,255,0.3); }
.member-photo-placeholder {
  width: 100px; height: 100px; border-radius: 50%;
  background: linear-gradient(135deg, var(--bg2), rgba(0,212,255,0.2));
  border: 2px solid var(--card-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; color: var(--cyan);
}
.member-name { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.member-name-en { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 6px; }
.member-title { font-size: 0.78rem; color: var(--cyan); margin-bottom: 8px; font-weight: 600; }
.member-year-badge {
  display: inline-block; font-size: 0.68rem;
  background: var(--violet-dim); color: var(--violet);
  border: 1px solid rgba(168,85,247,0.2); border-radius: 999px;
  padding: 2px 10px; margin-bottom: 10px;
}
.member-interests { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 12px; }
.member-bio { font-size: 0.78rem; color: var(--text-dim); text-align: left; margin-top: 8px; }
.member-links { display: flex; justify-content: center; gap: 8px; margin-top: 10px; }
.member-links a {
  width: 28px; height: 28px; border-radius: 8px;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; color: var(--text-dim); transition: all var(--transition);
}
.member-links a:hover { color: var(--cyan); border-color: rgba(0,212,255,0.4); background: var(--cyan-dim); }

.pi-card { display: flex; gap: 2rem; padding: 2rem; align-items: flex-start; }
.pi-photo {
  width: 140px; height: 140px; border-radius: 16px;
  object-fit: cover; flex-shrink: 0;
  border: 2px solid var(--card-border);
}
.pi-photo-placeholder {
  width: 140px; height: 140px; border-radius: 16px;
  background: linear-gradient(135deg, var(--bg2), rgba(0,212,255,0.2));
  display: flex; align-items: center; justify-content: center; font-size: 3rem; flex-shrink: 0;
}
.pi-info { flex: 1; }
.pi-info .edu-list { margin-top: 12px; display: flex; flex-direction: column; gap: 4px; }
.pi-info .edu-item { font-size: 0.8rem; color: var(--text-dim); display: flex; align-items: center; gap: 6px; }
.pi-info .edu-item::before { content: ''; width: 4px; height: 4px; border-radius: 50%; background: var(--cyan); flex-shrink: 0; }

.alumni-row {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 20px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--card-border);
  transition: all var(--transition);
}
.alumni-row:hover { border-color: rgba(168,85,247,0.3); }
.alumni-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  object-fit: cover; border: 2px solid var(--card-border);
}
.alumni-avatar-placeholder {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--bg2); display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; border: 2px solid var(--card-border);
}
.alumni-info { flex: 1; }
.alumni-info .name { font-weight: 600; font-size: 0.9rem; }
.alumni-info .meta { font-size: 0.78rem; color: var(--text-dim); }

/* ── Publications ──────────────────────────────────────────────── */
.pub-filters {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 32px;
  padding: 1.25rem; background: var(--card);
  border: 1px solid var(--card-border); border-radius: var(--radius-lg);
}
.pub-filter-group { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.pub-filter-group label { font-size: 0.75rem; color: var(--text-muted); font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; }
.filter-btn {
  padding: 5px 14px; border-radius: 999px; font-size: 0.78rem; font-weight: 500;
  border: 1px solid var(--card-border); background: transparent; color: var(--text-dim);
  cursor: pointer; transition: all var(--transition);
}
.filter-btn:hover, .filter-btn.active { background: var(--cyan-dim); color: var(--cyan); border-color: rgba(0,212,255,0.4); }

.pub-year-group { margin-bottom: 40px; }
.pub-year-label {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.15em;
  color: var(--cyan); text-transform: uppercase;
  padding: 6px 0 12px;
  border-bottom: 1px solid rgba(0,212,255,0.15);
  margin-bottom: 16px;
}
.pub-item {
  display: flex; gap: 16px;
  padding: 1.25rem 1.5rem; border-radius: var(--radius-lg);
  background: var(--card); border: 1px solid var(--card-border);
  margin-bottom: 12px; transition: all var(--transition);
}
.pub-item:hover { border-color: rgba(0,212,255,0.35); transform: translateX(4px); }
.pub-featured-bar {
  width: 3px; border-radius: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
  flex-shrink: 0;
}
.pub-body { flex: 1; }
.pub-title { font-size: 0.93rem; font-weight: 600; color: #fff; margin-bottom: 6px; line-height: 1.4; }
.pub-authors { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 4px; }
.pub-meta { font-size: 0.8rem; color: var(--cyan); font-weight: 500; margin-bottom: 8px; }
.pub-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.pub-doi-link {
  font-size: 0.75rem; color: var(--text-muted); margin-left: auto; align-self: flex-start;
  white-space: nowrap; padding: 3px 10px; border: 1px solid var(--card-border);
  border-radius: 6px; transition: all var(--transition);
}
.pub-doi-link:hover { color: var(--cyan); border-color: rgba(0,212,255,0.4); }

/* ── Projects ──────────────────────────────────────────────────── */
.project-card { overflow: hidden; }
.project-img-wrap {
  height: 180px; overflow: hidden; position: relative;
  background: linear-gradient(135deg, var(--bg2), rgba(0,212,255,0.1));
}
.project-img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.project-card:hover .project-img-wrap img { transform: scale(1.06); }
.project-img-placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center; font-size: 3rem;
  background: linear-gradient(135deg, var(--bg2), rgba(168,85,247,0.1));
}
.project-img-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(5,13,26,0.9) 100%);
}
.project-status-badge {
  position: absolute; top: 12px; right: 12px;
  padding: 3px 10px; border-radius: 999px; font-size: 0.68rem; font-weight: 700;
}
.status-active { background: rgba(16,185,129,0.2); color: var(--green); border: 1px solid rgba(16,185,129,0.3); }
.status-completed { background: rgba(168,85,247,0.15); color: var(--violet); border: 1px solid rgba(168,85,247,0.25); }
.project-body { padding: 1.5rem; }
.project-body h3 { font-size: 1rem; margin-bottom: 8px; }
.project-body p  { font-size: 0.82rem; color: var(--text-dim); margin-bottom: 12px; }
.project-meta { font-size: 0.78rem; color: var(--text-muted); display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.project-meta span { display: flex; align-items: center; gap: 4px; }

/* ── Gallery ───────────────────────────────────────────────────── */
.gallery-filters { display: flex; gap: 8px; margin-bottom: 28px; flex-wrap: wrap; }
.gallery-grid {
  columns: 3; column-gap: 16px;
}
.gallery-item {
  break-inside: avoid; margin-bottom: 16px;
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--card-border); cursor: pointer;
  transition: all var(--transition);
  position: relative;
}
.gallery-item:hover { border-color: rgba(0,212,255,0.4); transform: scale(1.02); }
.gallery-item img { width: 100%; display: block; transition: transform 0.5s ease; }
.gallery-item:hover img { transform: scale(1.05); }
.gallery-item-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(5,13,26,0.85) 100%);
  opacity: 0; transition: opacity var(--transition);
  display: flex; align-items: flex-end; padding: 12px;
}
.gallery-item:hover .gallery-item-overlay { opacity: 1; }
.gallery-caption { font-size: 0.78rem; color: var(--text); line-height: 1.3; }
.gallery-placeholder {
  height: 180px; background: linear-gradient(135deg, var(--bg2), rgba(0,212,255,0.06));
  display: flex; align-items: center; justify-content: center; font-size: 2.5rem;
}

/* Lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(5,13,26,0.96);
  display: none; align-items: center; justify-content: center;
  padding: 20px;
}
.lightbox.open { display: flex; }
.lightbox-img { max-width: 90vw; max-height: 85vh; border-radius: var(--radius); object-fit: contain; }
.lightbox-close {
  position: absolute; top: 20px; right: 24px;
  font-size: 1.5rem; cursor: pointer; color: var(--text-dim);
  background: var(--card); border: 1px solid var(--card-border);
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.lightbox-close:hover { color: var(--cyan); border-color: rgba(0,212,255,0.4); }
.lightbox-caption { position: absolute; bottom: 24px; color: var(--text-dim); font-size: 0.9rem; text-align: center; }

/* ── Awards ────────────────────────────────────────────────────── */
.timeline { position: relative; padding-left: 40px; }
.timeline::before {
  content: ''; position: absolute; left: 14px; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 100%);
  opacity: 0.3;
}
.timeline-item { position: relative; margin-bottom: 40px; }
.timeline-dot {
  position: absolute; left: -33px; top: 6px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg0); border: 2.5px solid var(--cyan);
  box-shadow: 0 0 12px rgba(0,212,255,0.5);
  transition: all var(--transition);
}
.timeline-item:hover .timeline-dot { background: var(--cyan); box-shadow: 0 0 20px rgba(0,212,255,0.8); }
.timeline-year {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em;
  color: var(--cyan); text-transform: uppercase; margin-bottom: 8px;
}
.award-card { padding: 1.25rem 1.5rem; }
.award-card h3 { font-size: 1rem; margin-bottom: 4px; }
.award-card .org { font-size: 0.82rem; color: var(--violet); font-weight: 600; margin-bottom: 6px; }
.award-card .recipient { font-size: 0.78rem; color: var(--cyan); margin-bottom: 8px; }
.award-card .desc { font-size: 0.82rem; color: var(--text-dim); }

/* ── About page ────────────────────────────────────────────────── */
.about-intro { display: grid; grid-template-columns: 1fr 1.4fr; gap: 60px; align-items: center; }
.about-img { border-radius: var(--radius-lg); overflow: hidden; position: relative; }
.about-img img { width: 100%; border-radius: var(--radius-lg); }
.about-img-placeholder {
  height: 320px; background: linear-gradient(135deg, var(--bg2), rgba(0,212,255,0.1));
  border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; font-size: 5rem;
}
.about-img::after {
  content: ''; position: absolute; inset: 0; border-radius: var(--radius-lg);
  border: 1px solid rgba(0,212,255,0.2);
  background: linear-gradient(135deg, rgba(0,212,255,0.04), transparent);
  pointer-events: none;
}
.info-table { width: 100%; border-collapse: collapse; }
.info-table tr { border-bottom: 1px solid rgba(255,255,255,0.04); }
.info-table td { padding: 12px 0; font-size: 0.88rem; }
.info-table td:first-child { color: var(--text-muted); width: 100px; font-weight: 600; }
.info-table td:last-child { color: var(--text); }

/* ── Footer ────────────────────────────────────────────────────── */
footer {
  background: var(--bg1);
  border-top: 1px solid var(--card-border);
  padding: 60px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand { }
.footer-brand .logo-icon {
  width: 44px; height: 44px; border-radius: 12px; margin-bottom: 12px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; color: #fff; font-weight: 800;
}
.footer-brand h3 { font-size: 1rem; margin-bottom: 8px; }
.footer-brand p { font-size: 0.82rem; color: var(--text-dim); max-width: 320px; line-height: 1.7; }
.footer-col h4 { font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--cyan); margin-bottom: 16px; font-weight: 700; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 0.82rem; color: var(--text-dim); }
.footer-col ul li a:hover { color: var(--cyan); }
.footer-contact { font-size: 0.82rem; color: var(--text-dim); line-height: 2; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.04);
  font-size: 0.78rem; color: var(--text-muted);
}

/* ── Error ─────────────────────────────────────────────────────── */
.error-page { min-height: 80vh; display: flex; align-items: center; justify-content: center; text-align: center; }
.error-code { font-size: 6rem; font-weight: 900; background: linear-gradient(135deg, var(--cyan), var(--violet)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; line-height: 1; }

/* ── Animations ────────────────────────────────────────────────── */
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease forwards; }
.fade-in-d1 { animation-delay: 0.1s; opacity: 0; }
.fade-in-d2 { animation-delay: 0.2s; opacity: 0; }
.fade-in-d3 { animation-delay: 0.3s; opacity: 0; }

.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .gallery-grid { columns: 2; }
  .about-intro { grid-template-columns: 1fr; gap: 32px; }
  .research-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  :root { --nav-height: 60px; }
  .nav-links { display: none; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: rgba(5,13,26,0.98); padding: 12px 16px; border-bottom: 1px solid var(--card-border); }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .gallery-grid { columns: 1; }
  .pi-card { flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .hero-stats { gap: 20px; }
  .research-grid { grid-template-columns: 1fr; }
  .pub-item { flex-direction: column; }
}

/* ── i18n: zh / en visibility ──────────────────────────────────── */
html.lang-en .zh-text { display: none !important; }
html.lang-zh .en-text { display: none !important; }

/* ── Language toggle button ────────────────────────────────────── */
.lang-btn {
  display: flex; align-items: center; gap: 5px;
  padding: 5px 13px; border-radius: 20px;
  border: 1px solid var(--card-border);
  background: transparent; color: var(--text-dim);
  font-size: 0.76rem; font-weight: 600; letter-spacing: 0.06em;
  cursor: pointer; transition: all var(--transition);
  font-family: 'Inter', sans-serif;
  white-space: nowrap;
}
.lang-btn:hover {
  border-color: var(--cyan); color: var(--cyan);
  background: var(--cyan-dim);
}
.lang-btn .lang-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan); flex-shrink: 0;
}
@media (max-width: 768px) {
  .lang-btn { padding: 4px 10px; font-size: 0.72rem; }
}