/* Layout: one 1200px column; case studies are the hero; amber is the only accent. Dark first. */
:root {
  --bg: #0d0f12;
  --surface: #15181d;
  --fg: #eeece7;
  --body: #d3d0c9;
  --muted: #a4a19a;
  --line: rgba(238, 236, 231, 0.14);
  --track: rgba(238, 236, 231, 0.2);
  --accent: #f2a93b;
  --accent-text: #f2a93b;
  --on-accent: #0d0f12;
  --tip: rgba(242, 169, 59, 0.1);
  --accent2: #8cc4e0;
  --glow: 0.14;
  --display: "Bricolage Grotesque", "Inter Tight", "Helvetica Neue", Arial, sans-serif;
  --sans: "Inter", "Helvetica Neue", Arial, system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f6f4ef; --surface: #ffffff; --fg: #16181c; --body: #2c2e33; --muted: #5b5953;
  --line: rgba(22, 24, 28, 0.14); --track: rgba(22, 24, 28, 0.16);
  --accent: #f2a93b; --accent-text: #8f530a; --on-accent: #16181c; --tip: rgba(242, 169, 59, 0.16);
  --accent2: #2a6f97; --glow: 0.22; color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--sans); font-size: 16px; line-height: 1.6; overflow-x: hidden; }
img { max-width: 100%; display: block; }
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { text-wrap: balance; }

.page { position: relative; overflow: hidden; min-height: 100vh; }
.glow { position: absolute; top: -240px; right: -180px; width: 620px; height: 620px; border-radius: 50%; background: var(--accent); opacity: var(--glow); filter: blur(140px); pointer-events: none; }
.glow.left { right: auto; left: -200px; }
.wrap { position: relative; max-width: 1200px; margin: 0 auto; padding-left: max(20px, env(safe-area-inset-left, 0px)); padding-right: max(20px, env(safe-area-inset-right, 0px)); }

/* Header */
.site-header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; padding-block: 28px; }
.brand { font-family: var(--display); font-weight: 700; font-size: 20px; letter-spacing: -0.01em; }
.nav { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 26px; font-size: 15px; color: var(--muted); }
.nav a:hover, .nav a[aria-current="page"] { color: var(--fg); }
.theme-toggle { width: 44px; height: 44px; border-radius: 22px; border: 1px solid var(--line); background: transparent; color: var(--fg); cursor: pointer; display: inline-flex; align-items: center; justify-content: center; }
.theme-toggle svg { width: 18px; height: 18px; }

/* Type helpers */
.eyebrow { margin: 0; font-family: var(--mono); font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent-text); font-weight: 500; }
.lede { margin: 0; max-width: 640px; font-size: 18px; line-height: 1.6; color: var(--muted); }
.accent { color: var(--accent-text); }
.h-display { margin: 0; font-family: var(--display); font-weight: 700; letter-spacing: -0.035em; line-height: 1.02; }

/* Home */
.hero { padding-block: 56px 44px; display: grid; gap: 24px; }
.hero h1 { font-size: clamp(40px, 6vw, 80px); max-width: 15ch; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.filter { min-height: 44px; padding: 0 20px; border-radius: 22px; border: 1px solid var(--line); background: transparent; color: var(--fg); font: 500 15px var(--sans); cursor: pointer; }
.filter .count { opacity: 0.6; margin-left: 4px; font-variant-numeric: tabular-nums; }
.filter[aria-pressed="true"] { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); gap: 20px; }
.card { display: flex; flex-direction: column; justify-content: space-between; gap: 40px; min-height: 300px; padding: 32px; border-radius: 20px; border: 1px solid var(--line); background: var(--surface); transition: transform .2s ease, border-color .2s ease; }
.cards:not([data-filter="all"]) .card-top { display: none; }
.cards:not([data-filter="all"]) .card-metric { margin-top: 0; }
.card:hover { transform: translateY(-3px); border-color: var(--accent); }
.card-top { display: flex; justify-content: flex-start; align-items: center; gap: 12px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; color: var(--muted); text-transform: uppercase; }
.tag { padding: 4px 10px; border-radius: 12px; border: 1px solid var(--line); }
.card-metric { margin-top: 28px; font-family: var(--display); font-weight: 700; font-size: 44px; letter-spacing: -0.025em; line-height: 1; color: var(--accent-text); }
.card-metric-label { margin-top: 8px; font-size: 14px; color: var(--muted); }
.card-title { font-family: var(--display); font-weight: 600; font-size: 23px; line-height: 1.25; letter-spacing: -0.015em; }
.card-foot { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-top: 14px; font-size: 14px; line-height: 1.45; color: var(--muted); }
.card-foot .arrow { flex: 0 0 auto; font-size: 20px; color: var(--accent-text); }
.about-strip { margin-top: 80px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 28px; padding: 32px; border-radius: 20px; border: 1px solid var(--line); }
.about-strip .who { display: flex; flex-wrap: wrap; align-items: center; gap: 24px; flex: 1 1 480px; min-width: 0; }
.about-strip img { width: 88px; height: 88px; border-radius: 44px; object-fit: cover; object-position: 50% 18%; flex: 0 0 auto; }
.about-strip p { margin: 0; flex: 1 1 300px; font-size: 17px; color: var(--muted); }
.btn { display: inline-flex; align-items: center; min-height: 48px; padding: 0 24px; border-radius: 24px; background: var(--accent); color: var(--on-accent); font-weight: 600; font-size: 15px; }
.btn.ghost { background: transparent; color: var(--fg); border: 1px solid var(--line); font-weight: 500; }

/* Footer */
.site-footer { padding-block: 88px 48px; }
.site-footer .cta { margin: 0; font-family: var(--display); font-weight: 700; font-size: clamp(28px, 4vw, 52px); letter-spacing: -0.025em; line-height: 1.12; }
.site-footer .cta a { color: var(--accent-text); }
.footer-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }

/* About */
.about-hero { padding-block: 56px 64px; display: flex; flex-wrap: wrap; gap: 48px; align-items: flex-start; }
.about-hero img { width: 260px; height: 325px; object-fit: cover; object-position: 50% 15%; border-radius: 20px; flex: 0 0 auto; max-width: 100%; }
.about-hero .text { flex: 999 1 480px; min-width: 0; display: grid; gap: 24px; }
.about-hero h1 { font-size: clamp(34px, 4.6vw, 60px); max-width: 17ch; }
.about-hero p.body { margin: 0; max-width: 680px; font-size: 18px; line-height: 1.7; color: var(--body); }
.band { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 32px 24px; padding-block: 40px; }
.stat-value { font-family: var(--display); font-weight: 700; font-size: 38px; letter-spacing: -0.02em; line-height: 1.1; }
.stat-label { margin-top: 8px; font-size: 14px; line-height: 1.45; color: var(--muted); }
.section { padding-block: 88px 8px; }
.section h2.eyebrow { margin-bottom: 36px; }
.principles { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: 40px; }
.principle { border-top: 1px solid var(--line); padding-top: 24px; }
.principle h3 { margin: 0 0 10px; font-family: var(--display); font-weight: 600; font-size: 24px; letter-spacing: -0.01em; }
.principle p { margin: 0; color: var(--muted); }
.career-row { display: flex; flex-wrap: wrap; gap: 4px 32px; padding-block: 20px; border-top: 1px solid var(--line); }
.career-row:last-child { border-bottom: 1px solid var(--line); }
.career-years { flex: 0 0 170px; font-family: var(--mono); font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; }
.career-org { flex: 0 0 110px; font-weight: 600; font-size: 17px; }
.career-text { flex: 999 1 320px; min-width: 0; }
.career-role { font-size: 17px; font-weight: 500; }
.career-desc { margin-top: 6px; font-size: 15px; line-height: 1.55; color: var(--muted); }

/* Case study page */
.cs-hero { padding-block: 56px 40px; display: grid; gap: 22px; }
.cs-hero h1 { font-size: clamp(34px, 5vw, 68px); max-width: 19ch; letter-spacing: -0.03em; line-height: 1.04; }
.cs-setting { margin: 0; font-size: 17px; color: var(--muted); }
.read-time { margin: 0; font-family: var(--mono); font-size: 13px; color: var(--muted); letter-spacing: 0.04em; }
.result { border: 1px solid var(--line); border-radius: 20px; background: var(--surface); padding: clamp(22px, 4vw, 40px); display: flex; flex-wrap: wrap; gap: 40px; align-items: center; }
.result-num { flex: 1 1 260px; min-width: 0; }
.result-metric { font-family: var(--display); font-weight: 700; font-size: clamp(52px, 7vw, 88px); letter-spacing: -0.03em; line-height: 1; color: var(--accent-text); }
.result-label { margin: 14px 0 0; color: var(--muted); }
.result-visual { flex: 1 1 460px; min-width: 0; }
.visual-label { margin: 0 0 14px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.visual-caption { margin: 14px 0 0; font-size: 14px; line-height: 1.5; color: var(--muted); }
.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 10px; }
.node { flex: 1 1 120px; border: 1px solid var(--line); border-radius: 14px; padding: 14px 14px; background: var(--bg); min-width: 0; }
.node.hl { border-color: var(--accent); }
.node.done { border-color: var(--accent); background: var(--tip); }
.node.dim { opacity: 0.6; border-style: dashed; }
.node b { display: block; font-size: 15px; font-weight: 600; line-height: 1.3; }
.node span { display: block; margin-top: 5px; font-size: 13px; line-height: 1.4; color: var(--muted); }
.flow-arrow { align-self: center; color: var(--muted); font-size: 18px; }
.bars { display: grid; gap: 14px; margin-top: 4px; }
.bar-head { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); margin-bottom: 6px; font-variant-numeric: tabular-nums; }
.bar { height: 12px; border-radius: 6px; background: var(--track); }
.bar.fill { background: var(--accent); }
.chart-box { overflow-x: auto; }
.chart-box svg { width: 100%; min-width: 560px; height: auto; display: block; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.sw { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -1px; margin-right: 6px; }
.c-bar { fill: var(--accent); }
.c-line { fill: none; stroke: var(--accent2); stroke-width: 2.5; }
.c-dot { fill: var(--accent2); stroke: var(--surface); stroke-width: 2; }
.c-grid { stroke: var(--line); stroke-width: 1; }
.c-band { fill: var(--line); opacity: 0.35; }
.c-gate { stroke: var(--fg); stroke-width: 1.5; stroke-dasharray: 4 4; opacity: 0.6; }
.c-gate-dot { fill: var(--fg); }
.c-gate-text { fill: var(--surface); font: 700 10px var(--sans); }
.c-text { fill: var(--muted); font: 11px var(--sans); }
.c-text-strong { fill: var(--fg); font: 600 12px var(--sans); }

.cs-body { padding-block: 72px 32px; display: flex; flex-wrap: wrap; gap: 56px; align-items: flex-start; }
.cs-article { flex: 999 1 560px; min-width: 0; max-width: 720px; }
.cs-article h2 { margin: 0 0 12px; font-family: var(--display); font-weight: 600; font-size: 26px; letter-spacing: -0.01em; }
.cs-article > p { margin: 0 0 40px; font-size: 18px; line-height: 1.65; color: var(--body); }
.cs-article .part { margin: 8px 0 20px; font-family: var(--mono); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent-text); font-weight: 500; }
.lesson { margin: 0 0 48px; padding: 28px; border-radius: 18px; background: var(--tip); font-family: var(--display); font-weight: 700; font-size: clamp(24px, 3vw, 34px); line-height: 1.2; letter-spacing: -0.02em; }
.options { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); gap: 12px; margin: 0 0 20px; }
.option { border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.option.chosen { border-color: var(--accent); background: var(--tip); }
.option-label { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; color: var(--muted); text-transform: uppercase; }
.option.chosen .option-label { color: var(--accent-text); }
.option p { margin: 8px 0 0; font-size: 15px; line-height: 1.5; }
.steps { list-style: none; margin: 0 0 48px; padding: 0; display: grid; gap: 30px; }
.step { display: flex; gap: 18px; }
.step-num { flex: 0 0 40px; width: 40px; height: 40px; border-radius: 20px; border: 1px solid var(--line); display: flex; align-items: center; justify-content: center; font-family: var(--mono); font-size: 13px; color: var(--accent-text); font-variant-numeric: tabular-nums; }
.step-body { flex: 1 1 auto; min-width: 0; }
.step h3 { margin: 6px 0 8px; font-size: 18px; font-weight: 600; }
.step p { margin: 0; font-size: 17px; line-height: 1.65; color: var(--body); }
.step ul, .cs-article ul { margin: 10px 0 0; padding-left: 20px; display: grid; gap: 8px; font-size: 17px; line-height: 1.6; color: var(--body); }
.tip { margin-top: 16px; border-radius: 14px; padding: 16px 18px; background: var(--tip); }
.tip-label { font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; color: var(--accent-text); }
.tip p { margin: 6px 0 0; font-size: 16px; line-height: 1.55; color: var(--fg); }
.cs-article .use-when { margin: 0 0 8px; }
.cs-aside { flex: 1 1 260px; max-width: 340px; border: 1px solid var(--line); border-radius: 18px; padding: 10px 24px; background: var(--surface); }
.fact { padding-block: 14px; border-bottom: 1px solid var(--line); }
.fact:last-child { border-bottom: 0; }
.fact-k { font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; color: var(--muted); text-transform: uppercase; }
.fact-v { margin-top: 6px; font-size: 15px; line-height: 1.5; }
.next { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; margin-top: 40px; padding: 28px; border-radius: 20px; border: 1px solid var(--line); }
.next:hover { border-color: var(--accent); }
.next-label { font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; color: var(--muted); }
.next-title { display: block; margin-top: 8px; font-family: var(--display); font-weight: 600; font-size: 22px; letter-spacing: -0.01em; }
.next .arrow { font-size: 24px; color: var(--accent-text); }

@media (max-width: 640px) {
  .card { padding: 24px; min-height: 0; }
  .about-strip { padding: 24px; }
  .site-header { padding-block: 20px; }
  .nav { gap: 6px 18px; }
  .filters { gap: 6px; }
  .filter { padding: 0 13px; font-size: 14px; }
  .flow { flex-direction: column; }
  .flow-arrow { align-self: flex-start; margin-left: 18px; transform: rotate(90deg); line-height: 1; }
}
@media (prefers-reduced-motion: reduce) { .card { transition: none; } .cards:not([data-filter="all"]) .card-top { display: none; }
.card:hover { transform: none; } }