/* ═══════════════════════════════════════════
   THEME VARIABLES
   ═══════════════════════════════════════════ */
:root {
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --max-w: 1400px;
  --nav-h: 78px;
  --radius: 12px;
  --radius-sm: 8px;
  --gap: 16px;
  --accent: #6366f1;
  --accent2: #22d3ee;
  --green: #22c55e;
  --orange: #f59e0b;
  --research-color: #a78bfa;
  --edu-color: #f59e0b;
  --work-color: #3b82f6;
  --transition: .25s ease;
}

/* ── Dark (default) ── */
[data-theme="dark"] {
  --bg: #222225;
  --bg-card: #2a2a2e;
  --bg-card-hover: #323236;
  --bg-elevated: #333338;
  --nav-bg: #1a1a1e;
  --text: #f5f5f5;
  --text-secondary: #e0e0e0;
  --text-muted: #a8a8a8;
  --border: #3e3e44;
  --border-hover: #555;
  --tag-bg: rgba(99,102,241,.15);
  --tag-text: #a5b4fc;
  --section-num: rgba(99,102,241,.2);
  --shadow: 0 8px 30px rgba(0,0,0,.25);
  --stat-bg: linear-gradient(135deg, rgba(99,102,241,.2), rgba(34,211,238,.15));
  --stat-border: rgba(99,102,241,.4);
  --hero-card-bg: linear-gradient(135deg, #252538 0%, #222840 60%, #232e48 100%);
  --work-border: rgba(59,130,246,.4);
  --research-border: rgba(167,139,250,.35);
  --edu-border: rgba(245,158,11,.35);
  --work-card-bg: rgba(59,130,246,.05);
  --research-card-bg: rgba(167,139,250,.05);
  --edu-card-bg: rgba(245,158,11,.05);
}

/* ── Light ── */
[data-theme="light"] {
  --bg: #f5f4f0;
  --bg-card: #ffffff;
  --bg-card-hover: #f7f6f3;
  --bg-elevated: #eeedea;
  --nav-bg: #e8e6e1;
  --text: #1a1a1a;
  --text-secondary: #2d2d2d;
  --text-muted: #6b7280;
  --border: #d8d5ce;
  --border-hover: #bbb;
  --tag-bg: rgba(99,102,241,.08);
  --tag-text: #6366f1;
  --section-num: rgba(99,102,241,.12);
  --shadow: 0 8px 30px rgba(0,0,0,.06);
  --stat-bg: linear-gradient(135deg, rgba(99,102,241,.12), rgba(34,211,238,.1));
  --stat-border: rgba(99,102,241,.3);
  --hero-card-bg: linear-gradient(135deg, #d5d0e8 0%, #c4d4e8 60%, #b8cce0 100%);
  --work-border: rgba(59,130,246,.7);
  --research-border: rgba(139,92,246,.7);
  --edu-border: rgba(217,119,6,.7);
  --work-card-bg: rgba(59,130,246,.07);
  --research-card-bg: rgba(139,92,246,.07);
  --edu-card-bg: rgba(217,119,6,.07);
}

/* ═══════════════════════════════════════════
   RESET & BASE
   ═══════════════════════════════════════════ */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; scroll-padding-top:calc(var(--nav-h) + 24px); }

body {
  font-family:var(--font); background:var(--bg); color:var(--text);
  line-height:1.7; -webkit-font-smoothing:antialiased;
  transition:background var(--transition), color var(--transition);
}

a { color:var(--accent); text-decoration:none; }
img { max-width:100%; display:block; }
.container { max-width:var(--max-w); margin:0 auto; padding:0 88px; }

/* ═══════════════════════════════════════════
   NAVBAR — two rows
   ═══════════════════════════════════════════ */
#navbar {
  position:fixed; top:0; left:0; right:0;
  background:var(--nav-bg);
  backdrop-filter:blur(16px); -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
  z-index:100;
  transition:box-shadow var(--transition), background var(--transition), border-color var(--transition);
}
#navbar.scrolled { box-shadow:0 2px 20px rgba(0,0,0,.12); }

/* ── Top bar: logo + social + theme ── */
.nav-top {
  max-width:var(--max-w); margin:0 auto; padding:0 88px;
  height:40px; display:flex; align-items:center; justify-content:space-between;
  border-bottom:1px solid color-mix(in srgb, var(--border) 50%, transparent);
}
.nav-top-right { display:flex; align-items:center; gap:4px; }

/* ── Logo ── */
.nav-logo {
  font-weight:800; font-size:1.15rem; color:var(--text); letter-spacing:-.5px;
  position:relative; display:inline-block;
}
.nav-logo::before {
  content:''; position:absolute; bottom:-2px; left:0; right:0;
  height:3px; background:linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius:2px; opacity:.7;
}

/* ── Bottom bar: page links + social ── */
.nav-bottom {
  max-width:var(--max-w); margin:0 auto; padding:0 88px;
  height:38px; display:flex; align-items:center; justify-content:space-between;
}

.nav-links { list-style:none; display:flex; align-items:center; gap:24px; }
.nav-links a {
  font-size:.88rem; font-weight:500; color:var(--text-muted);
  transition:color var(--transition);
}
.nav-links a:hover, .nav-links a.active { color:var(--text); }

.btn-cv {
  background:var(--text) !important; color:var(--nav-bg) !important;
  padding:5px 14px; border-radius:6px;
  font-size:.78rem !important; font-weight:600 !important;
  transition:opacity var(--transition);
}
.btn-cv:hover { opacity:.8; }

/* ── Nav social icons (bottom bar) ── */
.nav-social {
  display:flex; align-items:center; gap:1px;
}
.nav-social a {
  color:var(--text-muted); display:flex; align-items:center; justify-content:center;
  width:32px; height:32px; border-radius:8px;
  transition:all var(--transition);
}
.nav-social a:hover { opacity:.7; }
.nav-social a svg { width:18px; height:18px; }
/* Brand colors for nav social icons */
.nav-social a[title="Email"]          { color:#ea4335; }
.nav-social a[title="LinkedIn"]       { color:#0077b5; }
.nav-social a[title="GitHub"]         { color:var(--text-muted); }
.nav-social a[title="GitHub"]:hover   { color:var(--text); }
.nav-social a[title="Google Scholar"] { color:#4285f4; }
.nav-social a[title="LeetCode"]      { color:#ffa116; }
.nav-social a[title="X / Twitter"]    { color:var(--text-muted); }
.nav-social a[title="YouTube"]        { color:#ff0000; }
.nav-social a[title="Topmate"]        { color:#6366f1; }

/* ── Theme toggle ── */
.theme-toggle {
  background:none; border:1px solid var(--border); border-radius:8px;
  width:32px; height:32px; cursor:pointer; color:var(--text-muted);
  display:flex; align-items:center; justify-content:center;
  transition:all var(--transition); margin-left:6px;
}
.theme-toggle:hover { color:var(--text); border-color:var(--border-hover); }
[data-theme="dark"] .icon-sun { display:block; }
[data-theme="dark"] .icon-moon { display:none; }
[data-theme="light"] .icon-sun { display:none; }
[data-theme="light"] .icon-moon { display:block; }

/* ── Hamburger ── */
.nav-toggle {
  display:none; background:none; border:none; cursor:pointer;
  flex-direction:column; gap:5px; padding:6px; margin-left:4px;
}
.nav-toggle span {
  display:block; width:22px; height:2px; background:var(--text);
  border-radius:2px; transition:all .3s;
}

/* ═══════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════ */
#hero { padding-top:calc(var(--nav-h) + 40px); padding-bottom:24px; }

.hero-card {
  background:var(--hero-card-bg); border:1px solid var(--border);
  border-radius:16px; padding:52px 56px;
  transition:all var(--transition);
}

.hero-inner { display:flex; align-items:center; gap:44px; }

.hero-avatar {
  width:210px; height:210px; border-radius:50%;
  object-fit:cover; border:4px solid color-mix(in srgb, var(--accent) 30%, transparent);
  flex-shrink:0;
  box-shadow:0 0 0 8px color-mix(in srgb, var(--accent) 8%, transparent);
}

.hero-text { flex:1; }
.hero-text h1 {
  font-size:2.4rem; font-weight:800; letter-spacing:-1.5px;
  color:var(--text); margin-bottom:2px;
}
.hero-role { font-size:1.05rem; font-weight:600; color:var(--text-secondary); margin-bottom:4px; }
.hero-tagline { font-size:1rem; color:var(--text-muted); margin-bottom:16px; }

.hero-stats { display:flex; gap:14px; flex-wrap:wrap; }
.stat-pill {
  display:flex; align-items:baseline; gap:7px;
  background:var(--stat-bg); border:1px solid var(--stat-border);
  padding:12px 24px; border-radius:24px;
  transition:all var(--transition);
}
.stat-value {
  font-size:1.2rem; font-weight:800;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text;
}
.stat-label { font-size:.78rem; color:var(--text-muted); text-transform:uppercase; letter-spacing:.5px; }

/* ═══════════════════════════════════════════
   SECTIONS
   ═══════════════════════════════════════════ */
.section { padding:32px 0; }

.section-title {
  font-size:1.5rem; font-weight:700; margin-bottom:24px;
  display:flex; align-items:center; gap:12px; letter-spacing:-.5px;
  color:var(--text);
}
.section-num {
  font-size:2.2rem; font-weight:800;
  color:var(--accent);
  opacity:.5;
  transition:color var(--transition), opacity var(--transition);
}

.section-header-row { display:flex; justify-content:space-between; align-items:center; }
.see-all { font-size:.88rem; font-weight:500; color:var(--accent); }

/* ═══════════════════════════════════════════
   BLOG PREVIEW
   ═══════════════════════════════════════════ */
.blog-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:var(--gap); }

.blog-card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden;
  transition:all var(--transition); display:block; color:var(--text);
}
.blog-card:hover { border-color:var(--border-hover); transform:translateY(-3px); box-shadow:var(--shadow); }

.blog-card-cover {
  width:100%; height:140px; object-fit:cover; background:var(--bg-elevated);
}
.blog-card-cover.placeholder {
  display:flex; align-items:center; justify-content:center;
  color:var(--text-muted); font-size:.78rem; text-align:center; padding:12px;
  border-bottom:1px solid var(--border);
}
.blog-card-body { padding:18px; }
.blog-card-body h3 { font-size:.92rem; font-weight:600; margin-bottom:4px; color:var(--text); line-height:1.4; }
.blog-card-body p { font-size:.82rem; color:var(--text-muted); line-height:1.5; }
.blog-card-body .blog-date { font-size:.72rem; color:var(--orange); margin-top:8px; font-weight:600; }

/* ═══════════════════════════════════════════
   TIMELINE
   ═══════════════════════════════════════════ */
.timeline { position:relative; padding-left:32px; }
.timeline::before {
  content:''; position:absolute; left:8px; top:8px; bottom:8px;
  width:2px; background:var(--border);
  transition:background var(--transition);
}

/* ── Color legend ── */
.tl-legend {
  display:flex; gap:20px; margin-bottom:20px; padding-left:32px;
}
.tl-legend-item {
  display:flex; align-items:center; gap:6px;
  font-size:.78rem; color:var(--text-muted);
}
.tl-legend-dot {
  width:10px; height:10px; border-radius:50%;
}

.tl-item { position:relative; margin-bottom:16px; }
.tl-item::before {
  content:''; position:absolute; left:-28px; top:20px;
  width:12px; height:12px; border-radius:50%;
  background:var(--border); border:2px solid var(--bg);
  transition:all var(--transition); z-index:1;
}
/* Color-coded dots */
.tl-item.current::before,
.tl-item.work::before {
  background:var(--work-color); border-color:var(--bg);
  box-shadow:0 0 0 3px rgba(59,130,246,.2);
}
.tl-item.current::before { box-shadow:0 0 0 4px rgba(59,130,246,.3); }
.tl-item.research::before { background:var(--research-color); box-shadow:0 0 0 3px rgba(167,139,250,.2); }
.tl-item.education::before { background:var(--edu-color); box-shadow:0 0 0 3px rgba(245,158,11,.2); }

/* Color-coded subtle background tint on card */
.tl-card {
  border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden;
  transition:all var(--transition);
  border-left:3px solid var(--border);
}
.tl-item.work .tl-card,
.tl-item.current .tl-card {
  background:var(--work-card-bg);
  border-left-color:var(--work-border);
}
.tl-item.research .tl-card {
  background:var(--research-card-bg);
  border-left-color:var(--research-border);
}
.tl-item.education .tl-card {
  background:var(--edu-card-bg);
  border-left-color:var(--edu-border);
}

.tl-card:hover { box-shadow:var(--shadow); }
.tl-item.work .tl-card:hover,
.tl-item.current .tl-card:hover { border-left-color:var(--work-color); }
.tl-item.research .tl-card:hover { border-left-color:var(--research-color); }
.tl-item.education .tl-card:hover { border-left-color:var(--edu-color); }

.tl-card-top { display:flex; align-items:center; gap:14px; padding:18px 22px; }

.company-logo {
  width:44px; height:44px; border-radius:10px; flex-shrink:0;
  display:flex; align-items:center; justify-content:center;
  font-weight:700; font-size:.65rem; color:#fff; text-transform:uppercase;
}

.tl-info { flex:1; min-width:0; }
.tl-info h3 { font-size:.95rem; font-weight:600; color:var(--text); line-height:1.3; }
.tl-info .tl-sub { font-size:.82rem; color:var(--text-muted); }

.tl-right { text-align:right; flex-shrink:0; }
.tl-date { font-size:.78rem; color:var(--accent); font-weight:600; white-space:nowrap; }

.current-badge {
  display:inline-block; background:rgba(59,130,246,.12); color:var(--work-color);
  font-size:.62rem; font-weight:700; padding:2px 8px; border-radius:10px;
  text-transform:uppercase; letter-spacing:.5px;
}
.research-badge {
  display:inline-block; background:rgba(167,139,250,.12); color:var(--research-color);
  font-size:.62rem; font-weight:700; padding:2px 8px; border-radius:10px;
  text-transform:uppercase; letter-spacing:.5px;
}
.edu-badge {
  display:inline-block; background:rgba(245,158,11,.12); color:var(--orange);
  font-size:.62rem; font-weight:700; padding:2px 8px; border-radius:10px;
  text-transform:uppercase; letter-spacing:.5px;
}

.tl-tags { display:flex; flex-wrap:wrap; gap:5px; padding:0 22px 8px; }
.tag {
  background:var(--tag-bg); color:var(--tag-text);
  font-size:.7rem; font-weight:500; padding:3px 10px;
  border-radius:16px; white-space:nowrap;
  transition:background var(--transition), color var(--transition);
}

/* ── Hover-based expand ── */
.tl-details {
  max-height:0; overflow:hidden;
  transition:max-height .45s cubic-bezier(.4,0,.2,1), opacity .3s ease;
  opacity:0;
}
.tl-card:hover .tl-details,
.tl-details.pinned {
  max-height:600px; opacity:1;
}
.tl-details-inner { padding:12px 22px 20px; border-top:1px solid var(--border); }

.detail-images { display:grid; grid-template-columns:1fr 1fr; gap:8px; margin-bottom:14px; }
.detail-img {
  width:100%; height:120px; border-radius:var(--radius-sm);
  background:var(--bg-elevated); display:flex; align-items:center; justify-content:center;
  color:var(--text-muted); font-size:.72rem; text-align:center;
  border:2px dashed var(--border); transition:border-color var(--transition);
}
.detail-bullets { padding-left:18px; }
.detail-bullets li {
  font-size:.88rem; line-height:1.65; margin-bottom:8px;
  color:var(--text-secondary);
}

/* ═══════════════════════════════════════════
   CITE MODAL
   ═══════════════════════════════════════════ */
.cite-btn {
  background:var(--bg-elevated); border:1px solid var(--border);
  color:var(--accent); font-size:.75rem; font-weight:600;
  padding:5px 12px; border-radius:6px; cursor:pointer;
  display:inline-flex; align-items:center; gap:4px;
  transition:all var(--transition);
}
.cite-btn:hover { background:var(--accent); color:#fff; border-color:var(--accent); }

.cite-overlay {
  position:fixed; inset:0; background:rgba(0,0,0,.5);
  backdrop-filter:blur(4px); z-index:200;
  display:flex; align-items:center; justify-content:center;
  opacity:0; pointer-events:none; transition:opacity .25s;
}
.cite-overlay.open { opacity:1; pointer-events:all; }
.cite-modal {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:28px; max-width:560px; width:90%;
  position:relative;
}
.cite-modal h3 { font-size:1rem; font-weight:700; margin-bottom:14px; color:var(--text); }
.cite-modal pre {
  background:var(--bg-elevated); border:1px solid var(--border);
  border-radius:var(--radius-sm); padding:16px; font-size:.78rem;
  line-height:1.7; color:var(--text-secondary); overflow-x:auto;
  white-space:pre-wrap; word-break:break-word;
}
.cite-modal-close {
  position:absolute; top:12px; right:14px;
  background:none; border:none; font-size:1.2rem;
  color:var(--text-muted); cursor:pointer;
}
.cite-modal-close:hover { color:var(--text); }
.cite-copy {
  margin-top:12px; background:var(--accent); color:#fff;
  border:none; padding:8px 18px; border-radius:6px;
  font-size:.8rem; font-weight:600; cursor:pointer;
}
.cite-copy:hover { opacity:.85; }

/* ═══════════════════════════════════════════
   CONNECT
   ═══════════════════════════════════════════ */
.connect-card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:40px; text-align:center;
  transition:all var(--transition);
}
.connect-card > p { color:var(--text-muted); margin-bottom:24px; font-size:1rem; }
.connect-links { display:flex; justify-content:center; gap:10px; flex-wrap:wrap; }
.connect-link {
  padding:10px 22px; border-radius:24px; font-size:.92rem; font-weight:500;
  border:1px solid var(--border);
  color:var(--text); transition:all .3s; display:flex; align-items:center; gap:8px;
}
.connect-link svg { width:18px; height:18px; }
.connect-link:hover { opacity:.85; transform:translateY(-2px); box-shadow:var(--shadow); }
/* Brand-colored connect links */
.connect-link[data-brand="email"]    { background:rgba(234,67,53,.08); border-color:rgba(234,67,53,.25); color:#ea4335; }
.connect-link[data-brand="linkedin"] { background:rgba(0,119,181,.08); border-color:rgba(0,119,181,.25); color:#0077b5; }
.connect-link[data-brand="github"]   { background:var(--bg-elevated); }
.connect-link[data-brand="scholar"]  { background:rgba(66,133,244,.08); border-color:rgba(66,133,244,.25); color:#4285f4; }
.connect-link[data-brand="leetcode"] { background:rgba(255,161,22,.08); border-color:rgba(255,161,22,.25); color:#ffa116; }
.connect-link[data-brand="twitter"]  { background:rgba(0,0,0,.06); border-color:rgba(0,0,0,.15); }
.connect-link[data-brand="youtube"]  { background:rgba(255,0,0,.06); border-color:rgba(255,0,0,.2); color:#ff0000; }
.connect-link[data-brand="topmate"]  { background:rgba(99,102,241,.08); border-color:rgba(99,102,241,.25); color:#6366f1; }

/* ═══════════════════════════════════════════
   SKILLS (used on subpages)
   ═══════════════════════════════════════════ */
.skills-categories { display:flex; flex-direction:column; gap:24px; }
.skill-cat h3 {
  font-size:.85rem; text-transform:uppercase; letter-spacing:1.5px;
  color:var(--text-muted); margin-bottom:10px; font-weight:600;
}
.skill-bubbles { display:flex; flex-wrap:wrap; gap:8px; }
.skill-bubble {
  padding:8px 16px; border-radius:24px; font-size:.85rem; font-weight:500;
  background:var(--bg-card); border:1px solid var(--border);
  color:var(--text); transition:all .3s; cursor:default;
}
.skill-bubble:hover {
  background:var(--accent); color:#fff; border-color:var(--accent);
  transform:translateY(-2px); box-shadow:0 4px 12px rgba(99,102,241,.25);
}

/* ═══════════════════════════════════════════
   ABOUT PAGE
   ═══════════════════════════════════════════ */
.about-content { max-width:900px; }
.about-content p { margin-bottom:16px; font-size:1rem; color:var(--text-secondary); line-height:1.8; }

/* ═══════════════════════════════════════════
   PUBLICATIONS GRID (research page)
   ═══════════════════════════════════════════ */
.pub-grid { display:flex; flex-direction:column; gap:var(--gap); }
.pub-card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden;
  display:grid; grid-template-columns:220px 1fr; transition:all var(--transition);
}
.pub-card:hover { border-color:var(--border-hover); box-shadow:var(--shadow); }
.pub-card-image {
  width:100%; height:100%; min-height:180px; object-fit:cover;
  background:var(--bg-elevated);
}
.pub-card-image.placeholder {
  display:flex; align-items:center; justify-content:center;
  color:var(--text-muted); font-size:.78rem; text-align:center; padding:12px;
  border-right:1px solid var(--border);
}
.pub-card-body { padding:22px; }
.pub-venue {
  display:inline-block; font-size:.65rem; font-weight:700;
  text-transform:uppercase; letter-spacing:.5px;
  color:var(--green); background:rgba(34,197,94,.1);
  padding:2px 8px; border-radius:12px; margin-bottom:8px;
}
.pub-card-body h3 { font-size:.95rem; font-weight:600; line-height:1.4; margin-bottom:4px; color:var(--text); }
.pub-card-body .pub-org { font-size:.82rem; color:var(--text-muted); margin-bottom:8px; }
.pub-card-body p { font-size:.85rem; color:var(--text-muted); line-height:1.6; }
.pub-card-body .pub-tags { margin-top:10px; display:flex; flex-wrap:wrap; gap:5px; }
.pub-card-actions { margin-top:12px; display:flex; gap:8px; }

/* ═══════════════════════════════════════════
   EDUCATION GRID (about page)
   ═══════════════════════════════════════════ */
.edu-grid { display:grid; grid-template-columns:1fr 1fr; gap:var(--gap); }
.edu-card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden; transition:all var(--transition);
}
.edu-card:hover { border-color:var(--border-hover); }
.edu-card-image {
  width:100%; height:160px; object-fit:cover; background:var(--bg-elevated);
}
.edu-card-image.placeholder {
  display:flex; align-items:center; justify-content:center;
  color:var(--text-muted); font-size:.78rem; border-bottom:1px solid var(--border);
}
.edu-card-body { padding:20px; }
.edu-card-body h3 { font-size:1rem; font-weight:600; margin-bottom:3px; color:var(--text); }
.edu-card-body .edu-degree { font-size:.88rem; color:var(--text-secondary); margin-bottom:3px; }
.edu-card-body .edu-date { font-size:.78rem; color:var(--text-muted); }

/* ═══════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════ */
footer {
  text-align:center; padding:40px 0; font-size:.82rem;
  color:var(--text-muted); border-top:1px solid var(--border);
  transition:border-color var(--transition), color var(--transition);
}
footer a { color:var(--text-muted); }
footer a:hover { color:var(--accent); }

/* ═══════════════════════════════════════════
   SUBPAGE HEADER
   ═══════════════════════════════════════════ */
.page-header {
  padding-top:calc(var(--nav-h) + 48px); padding-bottom:16px;
}
.page-header h1 { font-size:2rem; font-weight:800; letter-spacing:-1px; color:var(--text); margin-bottom:6px; }
.page-header p { color:var(--text-muted); font-size:1rem; }

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */
@media (max-width: 768px) {
  .container { padding:0 20px; }
  .nav-top, .nav-bottom { padding:0 20px; }
  .nav-toggle { display:flex; }
  .nav-social { display:none !important; }
  .nav-bottom { display:none; }
  .nav-links {
    position:fixed; top:40px; left:0; right:0;
    background:var(--nav-bg); flex-direction:column; padding:24px;
    gap:18px; border-bottom:1px solid var(--border);
    transform:translateY(-120%); transition:transform var(--transition), background var(--transition);
  }
  .nav-links.open { transform:translateY(0); }

  .hero-card { padding:24px 20px; }
  .hero-inner { flex-direction:column; text-align:center; }
  .hero-avatar { width:150px; height:150px; }
  .hero-stats { justify-content:center; }

  .blog-grid { grid-template-columns:1fr; }
  .detail-images { grid-template-columns:1fr; }
  .edu-grid { grid-template-columns:1fr; }

  .pub-card { grid-template-columns:1fr; }
  .pub-card-image { min-height:120px; }
  .pub-card-image.placeholder { border-right:none; border-bottom:1px solid var(--border); }

  .connect-card { padding:28px 20px; }
  .tl-legend { padding-left:0; flex-wrap:wrap; }
}

@media (max-width: 480px) {
  .container { padding:0 16px; }
  .hero-text h1 { font-size:1.8rem; }
  .hero-avatar { width:120px; height:120px; }
  .section { padding:28px 0; }
  .stat-pill { padding:8px 16px; }
  .stat-value { font-size:1rem; }
  .stat-label { font-size:.7rem; }
  .section-title { font-size:1.25rem; }
  .page-header h1 { font-size:1.6rem; }
}

/* ═══════════════════════════════════════════
   SCROLL ANIMATIONS — fade in from below, fade out above
   ═══════════════════════════════════════════ */
.fade-in {
  opacity:0; transform:translateY(24px);
  transition:opacity .5s ease, transform .5s ease;
}
.fade-in.visible {
  opacity:1; transform:translateY(0);
}
.fade-in.above {
  opacity:0; transform:translateY(-16px);
  transition:opacity .35s ease, transform .35s ease;
}