/* =============================================================================
   Liangyu Wu — academic site. Zero-build static styling.
   Dark theme by default; light theme via [data-theme="light"].
   ========================================================================== */

/* ------------------------------------------------------------------ tokens */
:root {
  --accent: #2f81f7;          /* blue primary */
  --accent-2: #f0bf23;        /* gold accent  */
  --gold: #FFDF00;
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1120px;
  --shadow: 0 10px 30px -12px rgba(0,0,0,.55);
  --shadow-sm: 0 4px 14px -8px rgba(0,0,0,.5);
  --transition: .25s cubic-bezier(.4,0,.2,1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
          "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* dark (default) */
:root, [data-theme="dark"] {
  --bg: #0a0d12;
  --bg-2: #11161d;
  --surface: rgba(22, 28, 38, .72);
  --surface-solid: #161c26;
  --border: rgba(255,255,255,.10);
  --text: #e8edf4;
  --text-dim: #9aa7b8;
  --text-faint: #6b788a;
  --nav-bg: rgba(10,13,18,.72);
  --overlay: rgba(6,9,14,.62);
  --chip-bg: rgba(47,129,247,.14);
  --chip-text: #7db3ff;
  --event-color: #f0bf23;     /* gold — reads well on dark */
}

[data-theme="light"] {
  --bg: #f6f8fb;
  --bg-2: #ffffff;
  --surface: rgba(255,255,255,.86);
  --surface-solid: #ffffff;
  --border: rgba(15,25,45,.10);
  --text: #17202e;
  --text-dim: #4a5768;
  --text-faint: #8493a6;
  --nav-bg: rgba(255,255,255,.78);
  --overlay: rgba(255,255,255,.55);
  --chip-bg: rgba(47,129,247,.10);
  --chip-text: #1e63c9;
  --event-color: #b45309;     /* deep amber — reads well on white */
  --shadow: 0 10px 30px -14px rgba(20,40,80,.3);
  --shadow-sm: 0 4px 14px -8px rgba(20,40,80,.25);
}

/* -------------------------------------------------------------------- base */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-2); }

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

h1,h2,h3 { line-height: 1.2; font-weight: 700; letter-spacing: -.02em; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.accent { color: var(--gold); }

/* --------------------------------------------------------------- navbar */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}
.nav-inner {
  max-width: 100%; margin: 0; padding: 12px 28px;
  display: flex; align-items: center; gap: 20px;
}
.nav-brand {
  font-weight: 700; font-size: 1.28rem; color: var(--text);
  white-space: nowrap; letter-spacing: -.01em; margin-right: 12px;
}
.nav-brand:hover { color: var(--accent); }
.nav-links { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav-links a {
  position: relative; color: var(--text-dim); font-size: 1.04rem; font-weight: 500;
  padding: 8px 13px; border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}
/* animated underline that grows from center on hover */
.nav-links a::after {
  content: ""; position: absolute; left: 50%; bottom: 4px; width: 0; height: 2px;
  background: var(--accent); border-radius: 2px;
  transform: translateX(-50%); transition: width var(--transition);
}
.nav-links a:hover { color: var(--accent); background: var(--chip-bg); }
.nav-links a:hover::after { width: calc(100% - 26px); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.nav-btn {
  font-size: .92rem; font-weight: 600; padding: 9px 18px; border-radius: 10px;
  background: var(--accent); color: #fff; white-space: nowrap;
  transition: var(--transition);
}
.nav-btn:hover { color: #fff; filter: brightness(1.1); transform: translateY(-1px); }

/* outline variant: transparent fill; border+text follow the theme's text color */
.nav-btn.nav-outline {
  background: transparent; color: var(--text);
  border: 1.5px solid var(--text); filter: none;
}
.nav-btn.nav-outline:hover {
  background: var(--text); color: var(--bg); filter: none; transform: translateY(-1px);
}

.icon-btn {
  width: 38px; height: 38px; display: grid; place-items: center;
  border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-dim); cursor: pointer;
  transition: var(--transition);
}
.icon-btn:hover { color: var(--text); border-color: var(--accent); }
.icon-btn svg { width: 18px; height: 18px; }
#theme-toggle .moon { display: none; }
[data-theme="light"] #theme-toggle .sun { display: none; }
[data-theme="light"] #theme-toggle .moon { display: block; }

.nav-toggle { display: none; }

/* --------------------------------------------------------------- sections */
.section { padding: 96px 0; position: relative; }
.section-head { margin-bottom: 44px; }
.section-head h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
}
.section-head .kicker {
  display: inline-block; color: var(--accent); font-weight: 600;
  font-size: .82rem; letter-spacing: .14em; text-transform: uppercase;
  margin-bottom: 10px;
}
.section-head p { color: var(--text-dim); max-width: 60ch; margin-top: 8px; }

/* Background-image sections (parallax) — DARK MODE ONLY.
   In light mode these fall back to the plain light theme (no image). */
[data-theme="dark"] .bg-section { color: #fff; }
[data-theme="dark"] .bg-section::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image: var(--bg-url);
  background-size: cover; background-position: center;
  background-attachment: fixed;
}
[data-theme="dark"] .bg-section::after {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(180deg, rgba(6,9,14,.82), rgba(6,9,14,.68));
}
[data-theme="dark"] .bg-section h2,
[data-theme="dark"] .bg-section h3,
[data-theme="dark"] .bg-section p,
[data-theme="dark"] .bg-section li { color: #fff; }
[data-theme="dark"] .bg-section .section-head .kicker { color: var(--gold); }
[data-theme="dark"] .bg-section .back-link { color: rgba(255,255,255,.75); }
[data-theme="dark"] .bg-section .back-link:hover { color: #fff; }
[data-theme="dark"] .bg-section .section-head p { color: rgba(255,255,255,.8); }

/* ------------------------------------------------------------------- hero */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; padding: 120px 0 80px;
}
/* particle-collision canvas: fills the hero, behind the text */
.collider {
  position: absolute; inset: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
}
.hero > .container { position: relative; z-index: 1; }
/* hero background image + dark overlay: DARK MODE ONLY */
[data-theme="dark"] .hero::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image: var(--bg-url);
  background-size: cover; background-position: center;
  background-attachment: fixed;
}
[data-theme="dark"] .hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(1200px 600px at 70% 20%, rgba(47,129,247,.10), transparent 60%),
              linear-gradient(180deg, rgba(4,6,10,.72), rgba(3,5,9,.86));
}
/* light mode hero: subtle plain-theme backdrop, no photo */
[data-theme="light"] .hero {
  background: radial-gradient(1000px 520px at 72% 12%, rgba(47,129,247,.10), transparent 60%);
}
.hero-grid {
  display: grid; grid-template-columns: 260px 1fr; gap: 56px; align-items: center;
}
.hero-avatar {
  width: 240px; height: 240px; border-radius: 50%; object-fit: cover;
  border: 4px solid rgba(255,255,255,.15);
  box-shadow: 0 20px 60px -20px rgba(0,0,0,.8), 0 0 0 8px rgba(47,129,247,.08);
}
.hero h1 {
  font-family: "Fraunces", Georgia, "Times New Roman", serif;
  font-size: clamp(2.6rem, 6.5vw, 4.4rem); color: #fff; margin-bottom: 6px;
  font-weight: 600; letter-spacing: -.01em; line-height: 1.08;
}
.hero h1 .name-cn {
  font-size: 1em; font-weight: inherit; color: inherit;
  white-space: nowrap;
}
.hero .role { font-size: 1.25rem; color: var(--gold); font-weight: 600; margin-bottom: 6px; }
.hero .org { color: rgba(255,255,255,.82); font-size: 1.02rem; margin-bottom: 22px; }
.hero .org a { color: rgba(255,255,255,.92); }
.hero .tagline {
  color: rgba(255,255,255,.7); font-style: italic; font-size: 1.05rem;
  margin-bottom: 26px; border-left: 3px solid var(--accent); padding-left: 14px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.social-row { display: flex; gap: 10px; }
.social-row a {
  width: 44px; height: 44px; display: grid; place-items: center;
  border-radius: 12px; background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.14); color: #fff;
  backdrop-filter: blur(6px); transition: var(--transition);
}
.social-row a:hover { background: var(--accent); transform: translateY(-3px); color: #fff; }
.social-row svg { width: 20px; height: 20px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; font-weight: 600; font-size: .95rem;
  background: var(--accent); color: #fff; border: 1px solid transparent;
  cursor: pointer; transition: var(--transition);
}
.btn:hover { filter: brightness(1.12); transform: translateY(-2px); color: #fff; }
.btn-ghost {
  background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.2); color: #fff;
}
.btn-ghost:hover { background: rgba(255,255,255,.16); color: #fff; filter: none; }
.btn-sm { padding: 8px 16px; font-size: .85rem; }

/* hero call-to-action buttons: squared rectangle rather than pill */
.hero-actions .btn {
  border-radius: 12px; padding: 0 18px; height: 44px; font-size: 1rem;
}
.hero-actions .btn svg { width: 18px; height: 18px; }

.scroll-cue {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,.6); animation: bob 2s ease-in-out infinite;
}
@keyframes bob { 0%,100%{transform:translate(-50%,0)} 50%{transform:translate(-50%,8px)} }

/* =============================================================================
   LIGHT MODE: no background photos. Hero + bg-sections use the plain light
   theme, so all the white-on-photo styling is re-colored for a white backdrop.
   ========================================================================== */
[data-theme="light"] .hero h1 { color: var(--text); }
[data-theme="light"] .hero .role { color: var(--event-color); }
[data-theme="light"] .hero .org { color: var(--text-dim); }
[data-theme="light"] .hero .org a { color: var(--accent); }
[data-theme="light"] .scroll-cue { color: var(--text-faint); }

[data-theme="light"] .social-row a {
  background: var(--surface); border-color: var(--border); color: var(--text-dim);
}
[data-theme="light"] .social-row a:hover { background: var(--accent); color: #fff; }

[data-theme="light"] .btn-ghost {
  background: var(--chip-bg); border-color: var(--border); color: var(--accent);
}
[data-theme="light"] .btn-ghost:hover { background: var(--accent); color: #fff; }

[data-theme="light"] .interest-chip {
  background: var(--chip-bg); border-color: var(--border); color: var(--chip-text);
}

/* bg-section content in light mode falls back to normal cards/rows */
[data-theme="light"] .bg-section .card { background: var(--surface); border-color: var(--border); }
[data-theme="light"] .bg-section .card .summary,
[data-theme="light"] .bg-section .card .authors { color: var(--text-dim); }
[data-theme="light"] .bg-section .card .authors .me { color: var(--text); }
[data-theme="light"] .bg-section .card .meta { color: var(--text-faint); }
[data-theme="light"] .bg-section .talk-row { background: var(--surface); }
[data-theme="light"] .bg-section .talk-info .talk-loc { color: var(--text-faint); }
[data-theme="light"] .bg-section .talk-info .talk-event { color: var(--event-color); }

/* --------------------------------------------------------------- about/research */
.prose p { margin-bottom: 1rem; color: inherit; }
.prose p:last-child { margin-bottom: 0; }
/* inline links in the About / Research prose use gold, not blue */
.prose a { color: var(--gold); text-decoration: none; border-bottom: 1px solid rgba(255,223,0,.35); }
.prose a:hover { color: var(--gold); border-bottom-color: var(--gold); }
[data-theme="light"] .prose a { color: var(--event-color); border-bottom-color: rgba(180,83,9,.4); }
[data-theme="light"] .prose a:hover { border-bottom-color: var(--event-color); }

.interests { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.interest-chip {
  padding: 8px 16px; border-radius: 999px; font-size: .9rem; font-weight: 500;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.16); color: #fff;
}

.about-wrap { display: grid; grid-template-columns: 1fr; gap: 20px; max-width: 1000px; }
.about-wrap .prose { max-width: none; }

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

.card {
  background: var(--surface); backdrop-filter: blur(10px);
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: var(--transition);
  display: flex; flex-direction: column;
  box-shadow: var(--shadow-sm);
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--accent); }

/* JS-navigated card (projects) — inner links stay clickable */
.card-click { cursor: pointer; }
.card-click .card-media { display: block; }
.card-media { aspect-ratio: 16/9; overflow: hidden; background: var(--bg-2); }
.card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.card:hover .card-media img { transform: scale(1.05); }
.card-body { padding: 20px 22px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card-body h3 { font-size: 1.12rem; }
.card-body h3 a { color: inherit; }
.card-body h3 a:hover { color: var(--accent); }
.card .meta { font-size: .82rem; color: var(--text-faint); }
.card .summary { color: var(--text-dim); font-size: .92rem; flex: 1; }
.card .authors { font-size: .86rem; color: var(--text-dim); }
.card .authors .me { color: var(--text); font-weight: 700; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; position: relative; z-index: 2; }
.chip {
  font-size: .74rem; font-weight: 600; padding: 4px 10px; border-radius: 999px;
  background: var(--chip-bg); color: var(--chip-text); letter-spacing: .02em;
}
.chip.venue { background: rgba(240,191,35,.15); color: var(--accent-2); }
/* clickable tag chips */
a.chip-link { text-decoration: none; transition: var(--transition); }
a.chip-link:hover { background: var(--accent); color: #fff; }

/* tag results page section headings */
.tag-group-head {
  font-size: .82rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--text-faint); font-weight: 700;
  margin: 32px 0 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border);
}
.tag-group-head:first-child { margin-top: 8px; }

.card-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.pill-link {
  font-size: .78rem; font-weight: 600; padding: 5px 12px; border-radius: 8px;
  background: var(--chip-bg); color: var(--chip-text);
  display: inline-flex; align-items: center; gap: 5px;
}
.pill-link:hover { background: var(--accent); color: #fff; }

/* on bg-sections, cards stay readable with solid-ish surface */
.bg-section .card { background: rgba(18,24,34,.86); border-color: rgba(255,255,255,.12); }
.bg-section .card .summary, .bg-section .card .authors { color: rgba(255,255,255,.75); }
.bg-section .card .authors .me { color: #fff; }
.bg-section .card .meta { color: rgba(255,255,255,.55); }

.section-cta { text-align: center; margin-top: 40px; }

/* --------------------------------------------------------------- resume */
.resume-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: start; }

.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(var(--accent), transparent);
}
.tl-item { position: relative; padding-bottom: 30px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -26px; top: 5px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--accent); border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
}
.tl-item h4 { font-size: 1.18rem; margin-bottom: 2px; }
.tl-item .tl-sub { color: var(--accent); font-weight: 600; font-size: 1.02rem; }
.tl-item .tl-date { color: var(--text-faint); font-size: .88rem; margin: 2px 0 8px; }
.tl-item .tl-note { color: var(--text-dim); font-size: 1rem; margin-bottom: 6px; }
.tl-item ul { list-style: none; display: flex; flex-direction: column; gap: 5px; }
.tl-item ul li { position: relative; padding-left: 18px; color: var(--text-dim); font-size: 1rem; line-height: 1.55; }
.tl-item ul li::before { content: "▹"; position: absolute; left: 0; color: var(--accent); }
.tl-item .summary { color: var(--text-dim); font-size: 1rem; line-height: 1.6; }

.subhead {
  font-size: .82rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--text-faint); font-weight: 700; margin: 0 0 18px;
}
.side-block { margin-bottom: 40px; }

.skill-item { margin-bottom: 16px; }
.skill-item .skill-top { display: flex; justify-content: space-between; font-size: .9rem; margin-bottom: 6px; }
.skill-item .skill-top .pct { color: var(--text-faint); }
.bar { height: 7px; border-radius: 999px; background: var(--border); overflow: hidden; }
.bar > span { display: block; height: 100%; border-radius: 999px; background: var(--accent);
  width: 0; transition: width 1s cubic-bezier(.4,0,.2,1); }

/* skills / languages as chips (no self-scoring) */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
.skill-tag {
  padding: 8px 15px; border-radius: 999px; font-size: .95rem; font-weight: 600;
  background: var(--chip-bg); color: var(--chip-text);
  border: 1px solid var(--border);
}
.skill-tag:hover { border-color: var(--accent); }

.award-item {
  padding: 14px 16px; border-radius: var(--radius-sm); background: var(--surface);
  border: 1px solid var(--border); margin-bottom: 12px;
  border-left: 3px solid var(--accent-2);
}
.award-item .aw-title { font-weight: 600; font-size: .95rem; }
.award-item .aw-meta { color: var(--text-faint); font-size: .82rem; margin-top: 3px; }

/* --------------------------------------------------------------- list / detail pages */
.page { padding: 120px 0 80px; min-height: 80vh; position: relative; }
/* list pages carrying a background image sit above a full-height parallax layer */
[data-theme="dark"] .page.bg-section { min-height: 100vh; }
.back-link { display: inline-flex; align-items: center; gap: 6px; color: var(--text-dim);
  font-size: .9rem; font-weight: 600; margin-bottom: 24px; }
.back-link:hover { color: var(--accent); }

.detail-head h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin-bottom: 14px; }
.detail-meta { color: var(--text-dim); margin-bottom: 8px; }
.detail-meta .me { color: var(--text); font-weight: 700; }
.detail-figure { margin: 28px 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
.detail-figure img { width: 100%; }
.detail-figure figcaption, figure figcaption {
  padding: 10px 14px; font-size: .84rem; color: var(--text-faint);
  text-align: center; background: var(--surface-solid);
}
.detail-links { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0; }

.abstract-box {
  background: var(--surface); border: 1px solid var(--border);
  border-left: 3px solid var(--accent); border-radius: var(--radius-sm);
  padding: 20px 24px; margin: 24px 0; color: var(--text-dim);
}
.abstract-box h3 { font-size: .82rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px; }

/* article body (projects, news, teaching detail) */
.article-body { max-width: 780px; }
.article-body h2 { font-size: 1.5rem; margin: 32px 0 14px; }
.article-body h3 { font-size: 1.2rem; margin: 24px 0 10px; }
.article-body h4 { font-size: 1.02rem; margin: 18px 0 8px; }
.article-body p { margin-bottom: 14px; color: var(--text-dim); }
.article-body ul, .article-body ol { margin: 0 0 16px 22px; color: var(--text-dim); }
.article-body li { margin-bottom: 5px; }
.article-body figure { margin: 22px auto; text-align: center; max-width: 620px;
  border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.article-body figure img { width: 100%; }
.article-body strong { color: var(--text); }
.article-body details {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 18px; margin: 16px 0;
}
.article-body details summary { cursor: pointer; font-weight: 600; color: var(--accent); }
.article-body details[open] summary { margin-bottom: 10px; }

.article-body table {
  width: 100%; border-collapse: collapse; margin: 18px 0; font-size: .9rem;
  border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden;
}
.article-body th, .article-body td { padding: 9px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.article-body th { background: var(--chip-bg); color: var(--text); font-weight: 700; }
.article-body tr:last-child td { border-bottom: none; }
.article-body tbody tr:hover { background: var(--chip-bg); }

.video-embed { position: relative; padding-bottom: 56.25%; height: 0; margin: 18px 0;
  border-radius: var(--radius-sm); overflow: hidden; }
.video-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* talk list rows */
.talk-row {
  display: grid; grid-template-columns: 96px 1fr auto; gap: 18px; align-items: center;
  padding: 18px 20px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 14px; transition: var(--transition);
}
.talk-row:hover { border-color: var(--accent); transform: translateX(4px); }
.talk-date { text-align: center; }
.talk-date .d { font-size: 1.5rem; font-weight: 700; color: var(--accent); }
.talk-date .m { font-size: .78rem; text-transform: uppercase; color: var(--text-faint); }
.talk-info h3 { font-size: 1.05rem; margin-bottom: 4px; }
.talk-info h3 a { color: inherit; }
.talk-info .talk-event { font-size: .9rem; color: var(--event-color); font-weight: 600; }
.talk-info .talk-loc { font-size: .84rem; color: var(--text-faint); }
.bg-section .talk-row { background: rgba(18,24,34,.86); }
.bg-section .talk-info .talk-loc { color: rgba(255,255,255,.6); }
/* talk rows inside dark hero/section always use gold (dark bg regardless of theme) */
.bg-section .talk-info .talk-event { color: #f0bf23; }

@media (max-width: 560px) {
  .talk-row { grid-template-columns: 64px 1fr; }
  .talk-row .talk-cta { grid-column: 2; justify-self: start; }
}

/* --------------------------------------------------------------- footer */
.footer {
  padding: 40px 0; border-top: 1px solid var(--border);
  text-align: center; color: var(--text-faint); font-size: .88rem;
  background: var(--bg-2);
}
.footer a { color: var(--text-dim); }
.footer .foot-links { margin-bottom: 10px; display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }

/* --------------------------------------------------------------- reveal anim */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* --------------------------------------------------------------- responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 28px; justify-items: center; }
  .hero .tagline { border: none; padding: 0; }
  .hero-actions { justify-content: center; }
  .resume-grid { grid-template-columns: 1fr; gap: 40px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed; inset: 60px 0 auto 0; flex-direction: column; gap: 2px;
    background: var(--nav-bg); backdrop-filter: blur(16px);
    padding: 14px 24px; border-bottom: 1px solid var(--border);
    transform: translateY(-120%); transition: transform var(--transition);
    margin-left: 0;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 10px 12px; }
  .nav-toggle { display: grid; }
  .nav-desktop-cta { display: none; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
  /* disable fixed-attachment parallax on mobile (perf + iOS bug) */
  [data-theme="dark"] .hero::before,
  [data-theme="dark"] .bg-section::before { background-attachment: scroll; }
}

/* respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-cue { animation: none; }
  [data-theme="dark"] .hero::before,
  [data-theme="dark"] .bg-section::before { background-attachment: scroll; }
}