/* Compute Cosmos — design tokens + components. No external dependencies. */
:root {
  --font-sans: "Inter", "Segoe UI Variable", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --radius: 18px;
  --radius-sm: 10px;
  --maxw: 1180px;
  --ease: cubic-bezier(.2, .7, .2, 1);

  /* light */
  --bg: #f5f7fc;
  --bg-elev: #ffffff;
  --bg-soft: #eaeef8;
  --ink: #0b1226;
  --ink-2: #3a4560;
  --ink-3: #5b6683;
  --line: #d6dcea;
  --accent: #0a74c9;      /* cyan-blue, AA on white */
  --accent-2: #6a3fd6;    /* violet */
  --accent-ink: #ffffff;
  --glow: rgba(10, 116, 201, .14);
  --card-grad: linear-gradient(140deg, rgba(10,116,201,.07), rgba(106,63,214,.06));
  --hero-node: 10, 116, 201;
  --hero-link: 106, 63, 214;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #060a1a;
  --bg-elev: #0d1430;
  --bg-soft: #111a3b;
  --ink: #eef2ff;
  --ink-2: #b9c3e3;
  --ink-3: #8c97bd;
  --line: #222d57;
  --accent: #39d0ff;
  --accent-2: #a78bfa;
  --accent-ink: #04101f;
  --glow: rgba(57, 208, 255, .18);
  --card-grad: linear-gradient(140deg, rgba(57,208,255,.08), rgba(167,139,250,.07));
  --hero-node: 57, 208, 255;
  --hero-link: 167, 139, 250;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1.0625rem/1.65 var(--font-sans);
  text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased;
  transition: background-color .3s var(--ease), color .3s var(--ease);
}
img { max-width: 100%; display: block; }
[hidden] { display: none !important; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.02em; margin: 0 0 .5em; }
h2 { font-size: clamp(1.8rem, 1.2rem + 2.2vw, 2.8rem); }
h3 { font-size: 1.15rem; letter-spacing: -.01em; }
p { margin: 0 0 1em; }
.mono { font-family: var(--font-mono); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 1rem; top: -4rem; z-index: 100; background: var(--accent); color: var(--accent-ink); padding: .6rem 1rem; border-radius: 8px; }
.skip:focus { top: 1rem; }

.wrap { width: min(100% - 32px, var(--maxw)); margin-inline: auto; }
section { padding: clamp(4rem, 3rem + 4vw, 7rem) 0; scroll-margin-top: 72px; }
.eyebrow { font: 500 .78rem/1 var(--font-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin-bottom: 1rem; display: inline-flex; gap: .6rem; align-items: center; }
.eyebrow::before { content: ""; width: 28px; height: 1px; background: currentColor; }
.lede { font-size: 1.2rem; color: var(--ink-2); max-width: 62ch; }

/* header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(160%) blur(14px); -webkit-backdrop-filter: saturate(160%) blur(14px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
}
.site-header .wrap { display: flex; align-items: center; gap: 1rem; height: 64px; }
.brand { display: flex; align-items: center; gap: .65rem; color: var(--ink); text-decoration: none; font-weight: 650; letter-spacing: -.01em; }
.brand-mark { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font: 700 .85rem var(--font-mono); color: var(--accent-ink); background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.nav { margin-left: auto; display: flex; gap: .25rem; align-items: center; }
.nav a { color: var(--ink-2); text-decoration: none; font-size: .92rem; padding: .45rem .7rem; border-radius: 8px; }
.nav a:hover, .nav a[aria-current="page"], .nav a.active { color: var(--ink); background: var(--bg-soft); }
.icon-btn { appearance: none; border: 1px solid var(--line); background: var(--bg-elev); color: var(--ink); width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; cursor: pointer; }
.icon-btn:hover { border-color: var(--accent); }
.icon-btn svg { width: 18px; height: 18px; }
.menu-btn { display: none; }
@media (max-width: 860px) {
  .menu-btn { display: grid; margin-left: auto; }
  .nav { position: fixed; inset: 64px 0 auto 0; flex-direction: column; align-items: stretch; padding: .75rem 16px 1.25rem; background: var(--bg); border-bottom: 1px solid var(--line); transform: translateY(-120%); transition: transform .3s var(--ease); margin: 0; }
  .nav.open { transform: none; }
  .nav a { padding: .8rem .6rem; font-size: 1rem; }
}

/* hero */
.hero { position: relative; min-height: min(92vh, 860px); display: grid; align-items: center; padding: 6rem 0 4rem; overflow: hidden; isolation: isolate; }
.hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; }
.hero::after { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(55% 65% at 22% 48%, color-mix(in srgb, var(--bg) 88%, transparent) 0%, transparent 72%), linear-gradient(to bottom, transparent 70%, var(--bg)); }
.hero h1 { font-size: clamp(2.8rem, 1.4rem + 6vw, 6rem); font-weight: 750; letter-spacing: -.045em; margin-bottom: .25em; }
.hero h1 .grad { background: linear-gradient(100deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .role { font: 500 clamp(.95rem, .8rem + .5vw, 1.15rem)/1.5 var(--font-mono); color: var(--ink-2); margin-bottom: 1.4rem; }
.hero .tagline { font-size: clamp(1.15rem, 1rem + .6vw, 1.45rem); color: var(--ink-2); max-width: 40ch; }
.cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .8rem 1.2rem; border-radius: 12px; font-weight: 600; text-decoration: none; border: 1px solid var(--line); color: var(--ink); background: var(--bg-elev); transition: transform .2s var(--ease), border-color .2s, box-shadow .2s; }
.btn:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 10px 30px -10px var(--glow); }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--accent-ink); border-color: transparent; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin-top: 3.5rem; }
.stat { background: color-mix(in srgb, var(--bg-elev) 85%, transparent); padding: 1.2rem 1.3rem; }
.stat b { display: block; font: 700 clamp(1.6rem, 1.2rem + 1.4vw, 2.3rem)/1.1 var(--font-mono); letter-spacing: -.03em; }
.stat span { color: var(--ink-3); font-size: .88rem; }
@media (max-width: 700px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* bento */
.bento { display: grid; gap: 1rem; grid-template-columns: repeat(6, 1fr); }
.card { position: relative; background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem; overflow: hidden; transition: border-color .25s, transform .25s var(--ease), box-shadow .25s; }
.card::before { content: ""; position: absolute; inset: 0; background: var(--card-grad); opacity: .9; pointer-events: none; }
.card > * { position: relative; }
.card:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); transform: translateY(-3px); box-shadow: 0 20px 50px -24px var(--glow); }
.card .metric { font: 700 1.35rem/1.2 var(--font-mono); color: var(--accent); margin-bottom: .6rem; letter-spacing: -.02em; }
.card p { color: var(--ink-2); margin: 0; font-size: .97rem; }
.bento .card:nth-child(1) { grid-column: span 3; grid-row: span 2; }
.bento .card:nth-child(1) .metric { font-size: clamp(2rem, 1.4rem + 2vw, 3.2rem); }
.bento .card:nth-child(2) { grid-column: span 3; }
.bento .card:nth-child(n+3) { grid-column: span 3; }
@media (min-width: 900px) {
  .bento .card:nth-child(3) { grid-column: span 3; }
  .bento .card:nth-child(n+4) { grid-column: span 2; }
}
@media (max-width: 700px) { .bento { grid-template-columns: 1fr; } .bento .card { grid-column: auto !important; grid-row: auto !important; } }

/* about */
.about { display: grid; grid-template-columns: minmax(220px, 340px) 1fr; gap: clamp(2rem, 4vw, 4rem); align-items: start; }
.portrait { aspect-ratio: 4/5; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: var(--card-grad), var(--bg-soft); position: relative; }
.portrait img { width: 100%; height: 100%; object-fit: cover; }
.portrait .mono-mark { position: absolute; inset: 0; display: grid; place-items: center; font: 700 5rem var(--font-mono); color: var(--accent); opacity: .85; }
.about .long p { color: var(--ink-2); }
.about blockquote { margin: 0 0 1.6rem; font-size: 1.25rem; line-height: 1.55; color: var(--ink); border-left: 3px solid var(--accent); padding-left: 1.2rem; }
.chips { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.2rem; }
.chip { font: 500 .8rem var(--font-mono); padding: .35rem .7rem; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-2); background: var(--bg-elev); text-decoration: none; }
a.chip:hover { border-color: var(--accent); color: var(--ink); }
@media (max-width: 760px) { .about { grid-template-columns: 1fr; } .portrait { max-width: 280px; } }

/* timeline */
.tl-filters { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1.5rem 0 2rem; }
.seg { appearance: none; font: 500 .85rem var(--font-sans); padding: .5rem .9rem; border-radius: 999px; border: 1px solid var(--line); background: var(--bg-elev); color: var(--ink-2); cursor: pointer; }
.seg[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.timeline { position: relative; list-style: none; margin: 0; padding: 0 0 0 1.6rem; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--accent), var(--accent-2)); border-radius: 2px; opacity: .6; }
.tl-item { position: relative; margin-bottom: 1rem; }
.tl-item[hidden] { display: none; }
.tl-item::before { content: ""; position: absolute; left: calc(-1.6rem + 1px); top: 1.35rem; width: 12px; height: 12px; border-radius: 50%; background: var(--bg); border: 2px solid var(--accent); box-shadow: 0 0 0 4px var(--glow); }
.tl-item[data-kind="industry"]::before { border-color: var(--accent-2); }
.tl-btn { all: unset; box-sizing: border-box; display: grid; grid-template-columns: 9.5rem 1fr auto; gap: 1rem; align-items: baseline; width: 100%; cursor: pointer; padding: 1rem 1.2rem; border-radius: var(--radius-sm); border: 1px solid var(--line); background: var(--bg-elev); }
.tl-btn:hover { border-color: var(--accent); }
.tl-btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.tl-when { font: 500 .85rem var(--font-mono); color: var(--accent); }
.tl-role { font-weight: 650; }
.tl-org { color: var(--ink-3); font-size: .93rem; display: block; font-weight: 400; }
.tl-region { font: 500 .72rem var(--font-mono); text-transform: uppercase; letter-spacing: .1em; color: var(--ink-3); }
.tl-detail { padding: .9rem 1.2rem 0 calc(9.5rem + 2.2rem); color: var(--ink-2); }
.tl-detail ul { margin: .4rem 0 0; padding-left: 1.1rem; }
@media (max-width: 700px) {
  .tl-btn { grid-template-columns: 1fr; gap: .2rem; }
  .tl-detail { padding: .8rem .4rem 0; }
}

/* themes & projects */
.grid-3 { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); }
.theme-card .kw { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: 1rem; }
.theme-card .kw span { font: .74rem var(--font-mono); color: var(--ink-3); border: 1px dashed var(--line); padding: .15rem .5rem; border-radius: 6px; }
.theme-num { font: 600 .8rem var(--font-mono); color: var(--accent); margin-bottom: .8rem; display: block; }
.proj .meta { font: .8rem var(--font-mono); color: var(--ink-3); margin-bottom: .5rem; display: flex; flex-wrap: wrap; gap: .4rem 1rem; }
.proj .fund { color: var(--accent); font-weight: 600; }

/* publications */
.pub-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .75rem; }
.pub { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 1.1rem 1.2rem; display: grid; grid-template-columns: 4.2rem 1fr; gap: 1rem; }
.pub-year { font: 700 1.05rem var(--font-mono); color: var(--accent); }
.pub-title { font-weight: 620; color: var(--ink); line-height: 1.4; }
.pub-title a { color: inherit; text-decoration: none; }
.pub-title a:hover { color: var(--accent); text-decoration: underline; }
.pub-auth { color: var(--ink-3); font-size: .9rem; margin: .3rem 0; }
.pub-venue { color: var(--ink-2); font-size: .92rem; font-style: italic; }
.pub-tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .6rem; align-items: center; }
.tag { font: 500 .72rem var(--font-mono); padding: .18rem .5rem; border-radius: 6px; background: var(--bg-soft); color: var(--ink-2); }
.tag.tier { color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.tag.star { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 14%, transparent); }
.mini-btn { appearance: none; font: 500 .75rem var(--font-mono); padding: .25rem .6rem; border-radius: 6px; border: 1px solid var(--line); background: transparent; color: var(--ink-2); cursor: pointer; text-decoration: none; }
.mini-btn:hover { border-color: var(--accent); color: var(--ink); }
@media (max-width: 560px) { .pub { grid-template-columns: 1fr; gap: .2rem; } }

.toolbar { display: grid; gap: .8rem; grid-template-columns: 1fr auto auto auto; align-items: center; margin: 2rem 0 1.2rem; }
.field { display: flex; align-items: center; gap: .5rem; border: 1px solid var(--line); background: var(--bg-elev); border-radius: 12px; padding: 0 .9rem; }
.field:focus-within { border-color: var(--accent); box-shadow: 0 0 0 4px var(--glow); }
.field input, .field select, select.field { border: 0; background: transparent; color: var(--ink); font: inherit; font-size: .95rem; padding: .7rem 0; width: 100%; outline: none; }
select.field { padding: .7rem .9rem; }
.theme-filters { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.2rem; }
.count { font: .85rem var(--font-mono); color: var(--ink-3); margin-bottom: 1rem; }
@media (max-width: 760px) { .toolbar { grid-template-columns: 1fr 1fr; } .toolbar .field:first-child { grid-column: 1 / -1; } }

/* lists */
.cols-2 { display: grid; gap: 2.5rem; grid-template-columns: 1fr 1fr; }
@media (max-width: 760px) { .cols-2 { grid-template-columns: 1fr; } }
.rows { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.rows li { display: flex; justify-content: space-between; gap: 1rem; padding: .85rem 0; border-bottom: 1px solid var(--line); color: var(--ink-2); }
.rows li .when { font: .82rem var(--font-mono); color: var(--ink-3); white-space: nowrap; }

/* contact & footer */
.contact { text-align: center; }
.contact .big { font-size: clamp(1.6rem, 1rem + 3vw, 3rem); font-weight: 700; letter-spacing: -.03em; word-break: break-word; }
.site-footer { border-top: 1px solid var(--line); padding: 2rem 0; color: var(--ink-3); font-size: .85rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }

.toast { position: fixed; bottom: 1.5rem; left: 50%; transform: translate(-50%, 150%); background: var(--ink); color: var(--bg); padding: .7rem 1.1rem; border-radius: 10px; font: .9rem var(--font-mono); transition: transform .3s var(--ease); z-index: 90; }
.toast.show { transform: translate(-50%, 0); }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .card, .btn { transition: none; }
}
@view-transition { navigation: auto; }