/* ============ tokens ============ */
:root {
  --bg: #faf9f5;
  --bg-soft: #f3f1ea;
  --panel: #ffffff;
  --panel-2: #f4f2ec;
  --line: #ddd8c9;
  --line-soft: #e6e2d6;
  --text: #1c1e26;
  --muted: #4f5566;
  --faint: #8a8fa0;
  --accent: #0f766e;       /* build */
  --accent-dim: #0f766e1a;
  --accent-glow: #0f766e2b;
  --warm: #c2410c;         /* break */
  --warm-dim: #c2410c1a;
  --gold: #a16207;
  --nav-bg: #faf9f5d9;
  --glow-a: #e8e2d030;
  --glow-b: #ded6e830;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius: 14px;
  --maxw: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed; inset: 0;
  background:
    radial-gradient(700px 400px at 85% -5%, var(--glow-a) 0%, transparent 60%),
    radial-gradient(600px 420px at -10% 25%, var(--glow-b) 0%, transparent 60%);
  pointer-events: none; z-index: 0;
}
main, header, nav, footer { position: relative; z-index: 1; }

::selection { background: var(--accent); color: var(--bg); }
a { color: var(--accent); text-decoration: none; }
.accent { color: var(--accent); }
.accent-warm, .warm { color: var(--warm); }
strong { color: var(--text); font-weight: 600; }

/* ============ nav ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 max(24px, calc((100vw - var(--maxw)) / 2));
  height: 64px;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease;
}
.nav.scrolled { border-bottom-color: var(--line-soft); }
.nav-logo {
  font-family: var(--mono); font-weight: 600; font-size: 20px; color: var(--text);
}
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a {
  color: var(--muted); font-size: 14px; font-weight: 500;
  transition: color .2s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-cta {
  border: 1px solid var(--line); border-radius: 8px; padding: 7px 14px;
  color: var(--accent) !important;
}
.nav-cta:hover { border-color: var(--accent); }
.lang-switch {
  display: flex; gap: 2px; margin-left: 8px;
  border: 1px solid var(--line); border-radius: 8px; padding: 2px;
}
.lang-btn {
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  padding: 4px 8px; border: 0; background: transparent;
  color: var(--faint); cursor: pointer; border-radius: 6px;
  transition: color .15s ease, background .15s ease;
}
.lang-btn:hover { color: var(--text); }
.lang-btn.on { background: var(--accent); color: var(--bg); }

/* ============ hero ============ */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 150px 24px 40px;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700; letter-spacing: -.02em; line-height: 1.05;
}
.hero-tagline {
  font-size: clamp(20px, 2.6vw, 27px);
  font-weight: 600; color: var(--text);
  margin: 14px 0 18px; letter-spacing: -.01em;
}
.hero-body { color: var(--muted); font-size: 16.5px; max-width: 54ch; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.btn {
  display: inline-block; border-radius: 10px; padding: 12px 22px;
  font-size: 15px; font-weight: 600; transition: transform .15s ease, box-shadow .2s ease, border-color .2s;
}
.btn-primary {
  background: var(--accent); color: var(--bg);
  box-shadow: 0 4px 24px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px var(--accent-glow); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.hero-links { display: flex; gap: 20px; margin-top: 26px; flex-wrap: wrap; }
.hero-links a {
  font-family: var(--mono); font-size: 13px; color: var(--faint);
  border-bottom: 1px dashed transparent; transition: color .2s;
}
.hero-links a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* diagram */
.hero-diagram { min-width: 0; }
.diagram-svg {
  width: 100%; height: auto; display: block;
  background: linear-gradient(160deg, var(--panel) 0%, var(--bg-soft) 100%);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 10px;
}
.col-label { font-family: var(--mono); font-size: 10px; letter-spacing: .14em; fill: var(--faint); }
.wire { fill: none; stroke: #cdc7b6; stroke-width: 1.4; }
.wire-warm { stroke: #dfbca9; }
.node rect {
  fill: var(--panel-2); stroke: var(--line); stroke-width: 1;
}
.node-core rect { stroke: var(--accent); stroke-opacity: .55; fill: #eaf4f2; }
.node-warm rect { stroke: var(--warm); stroke-opacity: .55; fill: #f9ece4; }
.node-title { fill: var(--text); font-family: var(--sans); font-size: 13px; font-weight: 600; }
.node-sub { fill: var(--faint); font-family: var(--mono); font-size: 9.5px; }
.out circle { fill: var(--accent-dim); stroke: var(--accent); stroke-width: 1.2; }
.out-warm circle { fill: var(--warm-dim); stroke: var(--warm); }
.out-label { fill: var(--muted); font-family: var(--mono); font-size: 10px; }
.pulse { fill: var(--accent); filter: drop-shadow(0 0 4px var(--accent)); }
.pulse-warm { fill: var(--warm); filter: drop-shadow(0 0 4px var(--warm)); }
@media (prefers-reduced-motion: reduce) {
  .pulses { display: none; }
  html { scroll-behavior: auto; }
}
.diagram-caption {
  font-family: var(--mono); font-size: 11.5px; color: var(--faint);
  text-align: center; margin-top: 10px; letter-spacing: .06em;
}
.cap-teal { color: var(--accent); }
.cap-warm { color: var(--warm); }
.warm { color: var(--warm); }

/* stats */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: var(--line-soft);
  border: 1px solid var(--line-soft); border-radius: var(--radius);
  overflow: hidden; margin-top: 64px;
}
.stat {
  background: var(--bg-soft); padding: 26px 22px;
  display: flex; flex-direction: column; gap: 4px;
}
.stat-num {
  font-family: var(--mono); font-size: 34px; font-weight: 600; color: var(--accent);
  letter-spacing: -.02em;
}
.stat-label { font-size: 13px; color: var(--muted); }

/* ============ sections ============ */
.section {
  max-width: var(--maxw); margin: 0 auto; padding: 96px 24px 8px;
}
.section-kicker {
  font-family: var(--mono); font-size: 12px; letter-spacing: .18em;
  color: var(--accent); margin-bottom: 12px;
}
.section h2 {
  font-size: clamp(28px, 3.6vw, 40px); font-weight: 700;
  letter-spacing: -.02em; line-height: 1.15; margin-bottom: 16px;
}
.section-lede { color: var(--muted); max-width: 62ch; margin-bottom: 40px; font-size: 16.5px; }

/* about */
.about-grid {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: start;
}
.about-copy p { color: var(--muted); margin-bottom: 16px; }
.about-copy h2 { margin-bottom: 20px; }
.about-extra { font-size: 15px; }
.code-card {
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 16px 40px #00000012;
}
.code-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 16px; border-bottom: 1px solid var(--line-soft);
}
.code-bar span { width: 11px; height: 11px; border-radius: 50%; background: var(--line); }
.code-bar span:first-child { background: #ff5f57aa; }
.code-bar span:nth-child(2) { background: #febc2eaa; }
.code-bar span:nth-child(3) { background: #28c840aa; }
.code-bar em {
  font-family: var(--mono); font-style: normal; font-size: 12px;
  color: var(--faint); margin-left: 8px;
}
.code-card pre {
  padding: 20px; overflow-x: auto;
  font-family: var(--mono); font-size: 12.8px; line-height: 1.75;
  color: #52586a;
}
.c-kw { color: #7c3aed; }
.c-cls { color: #b45309; }
.c-str { color: #15803d; }

/* research */
.research-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px;
}
.r-card {
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 26px 26px 22px;
  transition: transform .2s ease, border-color .25s ease;
}
.r-card:hover { transform: translateY(-3px); border-color: #c8c2ae; }
.r-warm:hover { border-color: #e2c0ae; }
.r-top {
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px; margin-bottom: 14px; flex-wrap: wrap;
}
.r-venue {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; color: var(--faint);
}
.r-badge {
  font-family: var(--mono); font-size: 10px; letter-spacing: .08em;
  padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--muted); white-space: nowrap;
}
.r-badge-live { border-color: #9dd6b4; color: #15803d; background: #15803d0e; }
.r-badge-gold { border-color: #dbc490; color: var(--gold); background: #a162070e; }
.r-card h3 { font-size: 19px; font-weight: 600; letter-spacing: -.01em; margin-bottom: 10px; }
.r-card p { color: var(--muted); font-size: 14.5px; margin-bottom: 16px; }
.r-card code { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.r-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 14px; }
.r-tags span, .t-tags span, .p-tags span, .s-tags span {
  font-family: var(--mono); font-size: 11px; color: var(--muted);
  background: var(--panel-2); border: 1px solid var(--line-soft);
  padding: 3px 10px; border-radius: 999px; white-space: nowrap;
}
.r-link {
  font-family: var(--mono); font-size: 12.5px; margin-right: 16px;
}
.r-link:hover { text-decoration: underline; }
.method-note {
  margin-top: 26px; display: flex; gap: 20px; align-items: baseline;
  background: #eef3f1;
  border: 1px solid #cfe0dc; border-radius: var(--radius);
  padding: 22px 26px;
}
.method-label {
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em; color: var(--accent);
}
.method-note p { color: var(--muted); font-size: 14.5px; max-width: 82ch; }

/* timeline */
.timeline { border-left: 1px solid var(--line); margin-left: 6px; }
.t-item {
  position: relative; display: grid;
  grid-template-columns: 170px 1fr; gap: 24px;
  padding: 0 0 44px 32px;
}
.t-item::before {
  content: ""; position: absolute; left: -5.5px; top: 8px;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
}
.t-compact::before { border-color: var(--faint); }
.t-dates { font-family: var(--mono); font-size: 12.5px; color: var(--faint); letter-spacing: .04em; }
.t-body h3 { font-size: 19px; font-weight: 600; }
.t-note { font-size: 13.5px; font-weight: 400; color: var(--faint); }
.t-role { font-family: var(--mono); font-size: 13px; color: var(--accent); margin: 3px 0 12px; }
.t-body ul { list-style: none; margin-bottom: 14px; }
.t-body li {
  color: var(--muted); font-size: 14.5px; padding-left: 18px; position: relative; margin-bottom: 8px;
}
.t-body li::before {
  content: "▸"; position: absolute; left: 0; color: var(--accent); font-size: 12px; top: 2px;
}
.t-tags { display: flex; flex-wrap: wrap; gap: 7px; }

/* leaderboard table */
.board {
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: var(--radius); overflow: hidden; margin-bottom: 20px;
}
.board-head, .board-row {
  display: grid; grid-template-columns: 1.5fr 1fr 130px; gap: 12px;
  padding: 12px 22px; align-items: baseline;
}
.board-head {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--faint);
  border-bottom: 1px solid var(--line-soft);
}
.board-head span:last-child { text-align: right; }
.board-row { border-bottom: 1px solid var(--line-soft); transition: background .15s ease; }
.board-row:last-child { border-bottom: none; }
.board-row:hover { background: var(--bg-soft); }
.b-name { font-weight: 500; font-size: 14.5px; color: var(--text); }
.b-dom { font-family: var(--mono); font-size: 12px; color: var(--faint); }
.b-res { font-family: var(--mono); font-size: 13px; color: var(--muted); text-align: right; }
.b-strong { color: var(--accent); font-weight: 600; }
.board-more .b-name { color: var(--accent); }

/* original-methods block */
.methods {
  background: #eef3f1; border: 1px solid #cfe0dc;
  border-radius: var(--radius); padding: 26px 28px; margin-bottom: 20px;
}
.methods-head h3 { font-size: 19px; font-weight: 600; margin-bottom: 8px; }
.methods-head p { color: var(--muted); font-size: 14.5px; max-width: 72ch; margin-bottom: 18px; }
.methods-list { list-style: none; display: grid; gap: 12px; }
.methods-list li {
  display: grid; grid-template-columns: 190px 1fr; gap: 16px; align-items: baseline;
  padding-bottom: 12px; border-bottom: 1px solid #d9e6e2;
}
.methods-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.m-name {
  font-family: var(--mono); font-size: 12.5px; color: var(--accent); font-weight: 500;
  border-bottom: 1px dashed transparent; transition: border-color .15s ease;
}
a.m-name:hover { border-bottom-color: var(--accent); }
.m-desc { color: var(--muted); font-size: 14px; }
.methods-note {
  margin-top: 18px; padding-top: 16px; border-top: 1px solid #d9e6e2;
  font-size: 13.5px; color: var(--faint); max-width: 78ch;
}

/* Provenance caveat — deliberately sits above the leaderboard, not in a
   separate section further down, so nobody meets the results first. */
.board-note {
  margin: -20px 0 28px; padding: 14px 18px; max-width: 78ch;
  border-left: 3px solid var(--accent); background: var(--panel);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 13.5px; line-height: 1.6; color: var(--muted);
}
.board-note strong { color: var(--text); }
.board-note a { color: var(--accent); border-bottom: 1px dashed currentColor; }

/* projects */
.proj-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.p-card {
  display: block; background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 24px 26px;
  color: var(--text); transition: transform .2s ease, border-color .25s ease;
}
.p-card:hover { transform: translateY(-3px); border-color: #c8c2ae; }
.p-card h3 {
  font-family: var(--mono); font-size: 16px; font-weight: 600; color: var(--accent);
  margin-bottom: 10px;
}
.p-card h3 span { color: var(--faint); font-size: 13px; }
.p-card p { color: var(--muted); font-size: 14px; margin-bottom: 16px; }
.p-tags { display: flex; flex-wrap: wrap; gap: 7px; }

/* skills */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.s-card {
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 24px 26px;
}
.s-card h3 {
  font-family: var(--mono); font-size: 13px; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase; color: var(--text);
  margin-bottom: 16px;
}
.s-tags { display: flex; flex-wrap: wrap; gap: 8px; }

/* contact */
.contact { text-align: center; padding-bottom: 40px; }
.contact .section-lede { margin-left: auto; margin-right: auto; }
.contact-actions { margin-bottom: 26px; }
.contact-links { justify-content: center; }

/* footer */
.footer {
  border-top: 1px solid var(--line-soft); margin-top: 80px;
  padding: 28px 24px; text-align: center;
}
.footer p { font-family: var(--mono); font-size: 12px; color: var(--faint); }

/* reveal animation */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.on { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ============ responsive ============ */
@media (max-width: 960px) {
  .hero-inner, .about-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 120px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .research-grid, .proj-grid, .skills-grid { grid-template-columns: 1fr; }
  .t-item { grid-template-columns: 1fr; gap: 6px; }
}
@media (max-width: 560px) {
  .nav-links { gap: 16px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .board-head, .board-row { grid-template-columns: 1fr 90px; }
  .b-dom { display: none; }
  .methods-list li { grid-template-columns: 1fr; gap: 4px; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat-num { font-size: 26px; }
  .method-note { flex-direction: column; gap: 8px; }
}