/* ------------------------------------------------------------------ tokens */
:root {
  --paper: #F3F1EC;
  --paper-2: #EAE6DD;
  --paper-3: #E0DBD0;
  --ink: #111316;
  --ink-2: #33373D;
  --muted: #6F737A;
  --line: rgba(17, 19, 22, .12);
  --line-2: rgba(17, 19, 22, .06);
  --accent: #E2531F;      /* this work */
  --accent-soft: rgba(226, 83, 31, .12);
  --cobalt: #2F62D0;      /* adam */
  --teal: #2A8C78;        /* projected gradient */
  --graphite: #8B9098;    /* fixed-step gd */
  --ochre: #B8922A;
  --bad: #C8321E;
  --good: #2A8C78;
  --radius: 18px;
  --serif: "Instrument Serif", "Times New Roman", serif;
  --sans: "Hanken Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  --ease: cubic-bezier(.2, .7, .1, 1);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, video, canvas, svg { display: block; max-width: 100%; }
section[id], #stage { scroll-margin-top: 90px; }
a { color: inherit; }
code { font: 500 .86em/1.4 var(--mono); background: var(--line-2); padding: .12em .4em; border-radius: 6px; }
b { font-weight: 600; }
.wrap { width: min(1240px, 100% - 64px); margin-inline: auto; }
.mono { font-family: var(--mono); }
.small { font-size: 12px; letter-spacing: .02em; }
.muted { color: var(--muted); }
em { font-style: italic; }
::selection { background: var(--accent); color: #fff; }

/* film grain */
.grain {
  position: fixed; inset: -50%; z-index: 90; pointer-events: none; opacity: .055;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 1.2s steps(6) infinite;
}
@keyframes grain {
  0% { transform: translate(0, 0); } 20% { transform: translate(-3%, 2%); } 40% { transform: translate(2%, -3%); }
  60% { transform: translate(-2%, -1%); } 80% { transform: translate(3%, 3%); } 100% { transform: translate(0, 0); }
}

/* opening letterbox */
.letterbox { position: fixed; left: 0; right: 0; height: 50vh; background: var(--ink); z-index: 100; pointer-events: none; }
.lb-top { top: 0; transform-origin: top; }
.lb-bottom { bottom: 0; transform-origin: bottom; }

/* ------------------------------------------------------------------ nav */
.nav {
  position: fixed; top: 16px; left: 50%; transform: translateX(-50%); z-index: 50;
  width: min(1240px, 100% - 32px);
  display: flex; align-items: center; gap: 28px;
  padding: 10px 12px 10px 18px; border-radius: 999px;
  color: #fff; transition: background .5s var(--ease), color .5s var(--ease), box-shadow .5s var(--ease);
}
.nav.solid {
  color: var(--ink); background: rgba(243, 241, 236, .72);
  backdrop-filter: blur(16px) saturate(1.4); -webkit-backdrop-filter: blur(16px) saturate(1.4);
  box-shadow: 0 0 0 1px var(--line), 0 12px 40px -18px rgba(17, 19, 22, .25);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 600 16px/1 var(--sans); letter-spacing: -.01em; }
.brand svg { width: 26px; height: 26px; }
.nav.solid.dark { color: var(--paper); background: rgba(17, 19, 22, .62); box-shadow: 0 0 0 1px rgba(243, 241, 236, .1), 0 12px 40px -18px rgba(0, 0, 0, .5); }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  text-decoration: none; font-size: 14px; padding: 8px 12px; border-radius: 999px; opacity: .78;
  transition: opacity .3s, background .3s;
}
.nav-links a:hover, .nav-links a.on { opacity: 1; background: rgba(127, 127, 127, .14); }
.nav-tag {
  font: 500 11px/1 var(--mono); text-transform: uppercase; letter-spacing: .12em;
  padding: 9px 12px; border-radius: 999px; border: 1px solid currentColor; opacity: .8;
}

/* ------------------------------------------------------------------ shared type */
.slate {
  display: inline-flex; align-items: center; gap: 12px; margin: 0 0 22px;
  font: 500 12px/1 var(--mono); text-transform: uppercase; letter-spacing: .14em; color: var(--muted);
}
.slate span {
  padding: 6px 9px; border-radius: 6px; background: var(--ink); color: var(--paper); letter-spacing: .08em;
}
.slate.light { color: rgba(255, 255, 255, .82); }
.slate.light span { background: var(--accent); color: #fff; }
h1, h2, h3 { margin: 0; font-weight: 400; }
h2 {
  font: 400 clamp(40px, 6vw, 84px)/.98 var(--serif); letter-spacing: -.02em; max-width: 15ch;
}
h2 em, h1 em { color: var(--accent); }
h3 { font: 600 19px/1.3 var(--sans); letter-spacing: -.01em; }
.lede { max-width: 62ch; color: var(--ink-2); font-size: 18px; margin: 26px 0 0; }
.scene-head { margin-bottom: 56px; }
.split .w { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: .08em; margin-bottom: -.08em; }
.split .w > span { display: inline-block; will-change: transform; }

/* ------------------------------------------------------------------ buttons */
.btn {
  position: relative; display: inline-flex; align-items: center; justify-content: center;
  height: 54px; padding: 0 26px; border-radius: 999px; text-decoration: none;
  font: 500 15px/1 var(--sans); letter-spacing: .01em; overflow: hidden; isolation: isolate;
  transition: transform .4s var(--ease), color .4s var(--ease);
}
.btn span { position: relative; z-index: 1; }
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary::before {
  content: ""; position: absolute; inset: 0; background: var(--ink); border-radius: inherit; z-index: 0;
  transform: translateY(101%); transition: transform .5s var(--ease);
}
.btn.primary:hover::before { transform: none; }
.btn.ghost { color: #fff; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .55); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); background: rgba(255, 255, 255, .06); }
.btn.ghost:hover { background: rgba(255, 255, 255, .16); }
.btn:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ------------------------------------------------------------------ hero */
.hero { position: relative; min-height: 100svh; display: flex; flex-direction: column; justify-content: flex-end; overflow: hidden; background: #0e1620; }
.hero-video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transform: scale(1.12); }
.hero-shade {
  position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(9, 14, 22, .74) 0%, rgba(9, 14, 22, .42) 42%, rgba(9, 14, 22, 0) 72%),
    linear-gradient(180deg, rgba(9, 14, 22, .35) 0%, rgba(9, 14, 22, 0) 30%, rgba(243, 241, 236, 0) 62%, rgba(243, 241, 236, .9) 88%, var(--paper) 100%);
}
.hero-inner { position: relative; z-index: 2; padding-top: 22vh; color: #fff; }
.hero-title {
  font: 400 clamp(54px, 9.4vw, 148px)/.9 var(--serif); letter-spacing: -.025em; margin: 0;
}
.hero-title .ln { display: block; overflow: hidden; padding-bottom: .06em; }
.hero-title .ln > span { display: inline-block; }
.hero-title em { color: #FFB18F; }
.hero-sub { max-width: 54ch; font-size: 18px; color: rgba(255, 255, 255, .86); margin: 30px 0 34px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-stats {
  position: relative; z-index: 2; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  margin-top: 9vh; margin-bottom: 40px; border-top: 1px solid var(--line);
}
.stat { padding: 22px 22px 0 0; }
.stat + .stat { padding-left: 22px; border-left: 1px solid var(--line); }
.stat b { font: 400 clamp(40px, 4.4vw, 64px)/1 var(--serif); letter-spacing: -.02em; }
.stat .unit { font: 400 28px/1 var(--serif); color: var(--muted); margin-left: 2px; }
.stat .unit i { font-style: normal; }
.stat p { margin: 10px 0 0; font-size: 14px; line-height: 1.45; color: var(--ink-2); max-width: 26ch; }
.timecode {
  position: absolute; z-index: 3; top: 92px; right: max(32px, calc((100% - 1240px) / 2));
  display: flex; align-items: center; gap: 10px; color: rgba(255, 255, 255, .8); font: 500 12px/1 var(--mono); letter-spacing: .1em;
}
.rec { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: blink 1.6s infinite; }
@keyframes blink { 50% { opacity: .2; } }
.scroll-cue {
  position: absolute; z-index: 3; right: max(32px, calc((100% - 1240px) / 2)); bottom: 210px;
  width: 26px; height: 44px; border-radius: 14px; border: 1.5px solid rgba(17, 19, 22, .4);
}
.scroll-cue span { position: absolute; left: 50%; top: 8px; width: 3px; height: 8px; margin-left: -1.5px; border-radius: 2px; background: var(--ink); animation: cue 1.8s var(--ease) infinite; }
@keyframes cue { 0% { transform: translateY(0); opacity: 1; } 80% { transform: translateY(16px); opacity: 0; } 100% { opacity: 0; } }

/* ------------------------------------------------------------------ landscape */
.landscape { padding: 140px 0 60px; }
.stage {
  position: relative; width: min(1400px, 100% - 32px); margin-inline: auto; height: min(88vh, 860px); min-height: 560px;
  border-radius: 28px; overflow: hidden;
  background: radial-gradient(120% 90% at 50% 0%, #FBFAF7 0%, var(--paper) 55%, var(--paper-2) 100%);
  box-shadow: 0 0 0 1px var(--line), 0 50px 120px -60px rgba(17, 19, 22, .35);
}
#land { position: absolute; inset: 0; width: 100%; height: 100%; cursor: grab; touch-action: pan-y; }
#land.dragging { cursor: grabbing; }
.stage-labels { position: absolute; inset: 0; pointer-events: none; }
.tag3d {
  position: absolute; left: 0; top: 0; white-space: nowrap; font: 500 11px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase;
  color: var(--ink); padding: 7px 9px; border-radius: 8px; background: rgba(243, 241, 236, .82); box-shadow: 0 0 0 1px var(--line);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); transition: opacity .3s;
}
.tag3d.accent { background: var(--accent); color: #fff; box-shadow: none; }
.glass {
  background: rgba(250, 249, 246, .7);
  backdrop-filter: blur(18px) saturate(1.3); -webkit-backdrop-filter: blur(18px) saturate(1.3);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .6) inset, 0 0 0 1px var(--line), 0 30px 60px -30px rgba(17, 19, 22, .3);
}
.stage-panel {
  position: absolute; top: 20px; right: 20px; width: 372px; max-width: calc(100% - 40px);
  border-radius: 20px; padding: 18px;
}
.panel-top { display: flex; align-items: baseline; justify-content: space-between; }
.panel-top .small { color: var(--muted); text-transform: uppercase; letter-spacing: .12em; }
.iter { font: 400 46px/1 var(--serif); font-variant-numeric: tabular-nums; }
.progress { height: 3px; background: var(--line); border-radius: 2px; margin: 12px 0 14px; overflow: hidden; }
.progress i { display: block; height: 100%; width: 0; background: var(--ink); }
.legend { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.legend li {
  display: grid; grid-template-columns: 14px 1fr auto; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 10px; cursor: pointer; user-select: none; transition: background .25s, opacity .25s;
}
.legend li:hover { background: var(--line-2); }
.legend li.off { opacity: .35; }
.legend .sw { width: 14px; height: 3px; border-radius: 2px; }
.legend .nm { font-size: 13px; line-height: 1.25; }
.legend .nm small { display: block; color: var(--muted); font: 400 11px/1.3 var(--mono); margin-top: 2px; }
.legend .st { font: 500 11px/1 var(--mono); padding: 5px 7px; border-radius: 6px; background: var(--line-2); white-space: nowrap; }
.legend .st.done { background: var(--accent-soft); color: var(--accent); }
.panel-actions { display: flex; gap: 8px; margin-top: 14px; }
.chip-btn {
  flex: 1; display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 40px; border-radius: 12px;
  border: 0; background: var(--ink); color: var(--paper); font: 500 13px/1 var(--sans); cursor: pointer; transition: background .3s, transform .3s var(--ease);
}
.chip-btn + .chip-btn { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1px var(--line); }
.chip-btn[aria-pressed="true"] { background: var(--accent); color: #fff; box-shadow: none; }
.chip-btn:hover { transform: translateY(-1px); }
.chip-btn svg { width: 16px; height: 16px; }
.stage-hint { position: absolute; left: 22px; bottom: 18px; margin: 0; color: var(--muted); text-transform: uppercase; letter-spacing: .14em; }
.stage-fallback[hidden] { display: none; }
.stage-fallback { position: absolute; inset: 0; display: grid; place-items: center; margin: 0; color: var(--muted); }

/* ------------------------------------------------------------------ failures */
.failures { padding: 140px 0 120px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: #FBFAF7; border-radius: var(--radius); padding: 22px 24px 28px; box-shadow: 0 0 0 1px var(--line);
  transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
.card:hover { transform: translateY(-6px); box-shadow: 0 0 0 1px var(--line), 0 30px 60px -36px rgba(17, 19, 22, .35); }
.card-art { width: 100%; height: auto; margin-bottom: 18px; border-radius: 12px; background: var(--paper); overflow: hidden; }
.card h3 { margin-bottom: 8px; }
.card p { margin: 0; color: var(--ink-2); font-size: 15.5px; }
.bad { color: var(--bad); }
.grid-l { stroke: var(--line); stroke-width: 1; fill: none; }
.curve-bad, .zig, .kink { fill: none; stroke: var(--bad); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.kink { stroke: var(--graphite); stroke-dasharray: 6 6; }
.smooth { fill: none; stroke: var(--accent); stroke-width: 2.6; stroke-linecap: round; }
.dot { fill: var(--ink); }
.bad-dot { fill: var(--bad); }
.art-label { font: 500 12px var(--mono); fill: var(--muted); }
.art-label.bad { fill: var(--bad); }

/* ------------------------------------------------------------------ method */
.method { padding: 140px 0; background: var(--ink); color: var(--paper); border-radius: 36px; margin: 0 16px; }
.method .slate { color: rgba(243, 241, 236, .6); }
.method .slate span { background: var(--paper); color: var(--ink); }
.method .lede { color: rgba(243, 241, 236, .75); }
.method code { background: rgba(243, 241, 236, .1); }
.method-grid { display: grid; grid-template-columns: 5fr 7fr; gap: 80px; align-items: start; }
.method-aside { position: sticky; top: 110px; }
.method h2 { font-size: clamp(40px, 4.8vw, 70px); max-width: 12ch; }
.proj-fig { margin: 44px 0 0; padding: 16px; border-radius: var(--radius); background: var(--paper); }
.proj-fig svg { width: 100%; height: auto; border-radius: 10px; }
.fig-t { font: 500 12px var(--mono); fill: var(--ink); }
.fig-t.accent { fill: var(--accent); }
.proj-fig figcaption { color: var(--muted); margin-top: 12px; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.step {
  position: relative; padding: 30px 32px; border-radius: var(--radius);
  background: rgba(243, 241, 236, .045); box-shadow: inset 0 0 0 1px rgba(243, 241, 236, .1);
}
.step-n { font: 400 15px/1 var(--mono); color: var(--accent); }
.step h3 { margin: 14px 0 10px; font-size: 22px; }
.step p { margin: 10px 0 0; color: rgba(243, 241, 236, .78); }
.math { margin: 18px 0 4px; padding: 16px 18px; border-radius: 12px; background: rgba(243, 241, 236, .06); overflow-x: auto; overflow-y: hidden; }
.math .katex-display { margin: 0; }
.katex { font-size: 1.08em; }

/* ------------------------------------------------------------------ benchmark */
.benchmark { padding: 160px 0 120px; }
.tabs { display: inline-flex; gap: 4px; padding: 5px; border-radius: 999px; background: var(--paper-2); margin-bottom: 18px; }
.tabs button {
  border: 0; background: transparent; padding: 11px 18px; border-radius: 999px; font: 500 14px/1 var(--sans); color: var(--ink-2); cursor: pointer;
  transition: background .3s, color .3s;
}
.tabs button[aria-selected="true"] { background: var(--ink); color: var(--paper); }
.chart-card { background: #FBFAF7; border-radius: 24px; box-shadow: 0 0 0 1px var(--line); padding: 22px 22px 18px; }
.chart-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; color: var(--muted); }
.chart-legend { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.chart-legend li {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 11px; border-radius: 999px; box-shadow: inset 0 0 0 1px var(--line);
  font: 500 12.5px/1 var(--sans); color: var(--ink); cursor: pointer; user-select: none; transition: opacity .25s, background .25s;
}
.chart-legend li.off { opacity: .4; }
.chart-legend li:hover { background: var(--line-2); }
.chart-legend i { width: 14px; height: 3px; border-radius: 2px; }
.chart { position: relative; height: 460px; margin-top: 12px; }
.chart svg { width: 100%; height: 100%; overflow: visible; }
.chart .axis text { font: 400 11px var(--mono); fill: var(--muted); }
.chart .axis path, .chart .axis line { stroke: var(--line); }
.chart .gridline { stroke: var(--line-2); }
.chart .thr { stroke: var(--ink); stroke-opacity: .22; stroke-dasharray: 3 5; }
.chart .thr-t { font: 500 10.5px var(--mono); fill: var(--muted); }
.chart .series { fill: none; stroke-linejoin: round; stroke-linecap: round; transition: opacity .3s, stroke-width .3s; }
.chart .series.dim { opacity: .12; }
.chart .end-t { font: 500 10.5px var(--mono); }
.chart .rule { stroke: var(--ink); stroke-opacity: .35; }
.tip {
  position: absolute; pointer-events: none; z-index: 5; min-width: 220px; padding: 12px 14px; border-radius: 12px; font-size: 12.5px;
  background: rgba(17, 19, 22, .92); color: var(--paper); box-shadow: 0 20px 40px -20px rgba(0, 0, 0, .5); opacity: 0; transition: opacity .2s;
}
.tip b { display: block; font: 500 11px var(--mono); color: rgba(243, 241, 236, .6); margin-bottom: 6px; letter-spacing: .06em; }
.tip div { display: grid; grid-template-columns: 10px 1fr auto; gap: 8px; align-items: center; line-height: 1.7; }
.tip i { width: 10px; height: 3px; border-radius: 2px; }
.tip span:last-child { font-family: var(--mono); font-size: 11.5px; }
.chart-note { margin: 14px 4px 2px; color: var(--ink-2); font-size: 15px; max-width: 90ch; }
.table-wrap { margin-top: 22px; overflow-x: auto; border-radius: 20px; box-shadow: 0 0 0 1px var(--line); background: #FBFAF7; }
.results { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 680px; }
.results th { text-align: left; font: 500 11px/1 var(--mono); text-transform: uppercase; letter-spacing: .1em; color: var(--muted); padding: 16px 18px; border-bottom: 1px solid var(--line); }
.results td { padding: 13px 18px; border-bottom: 1px solid var(--line-2); font-variant-numeric: tabular-nums; }
.results td:not(:first-child) { font-family: var(--mono); font-size: 13px; }
.results tr:last-child td { border-bottom: 0; }
.results tr.ours td { background: var(--accent-soft); }
.results tr.ours td:first-child { font-weight: 600; }
.results .na { color: var(--muted); }
.results .sw { display: inline-block; width: 12px; height: 3px; border-radius: 2px; margin-right: 10px; vertical-align: middle; }

/* ------------------------------------------------------------------ stability */
.stability { position: relative; padding: 150px 0; overflow: hidden; }
.mist { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .7; filter: grayscale(1) contrast(.9) brightness(1.08); }
.stability-veil { position: absolute; inset: 0; background: linear-gradient(180deg, var(--paper) 0%, rgba(243, 241, 236, .35) 22%, rgba(243, 241, 236, .35) 78%, var(--paper) 100%); }
.stability-inner { position: relative; }
.stab-card { border-radius: 24px; padding: 10px 10px 18px; overflow-x: auto; }
.stab { width: 100%; border-collapse: collapse; min-width: 760px; }
.stab th, .stab td { padding: 13px 14px; text-align: right; font: 400 13px/1.3 var(--mono); border-bottom: 1px solid var(--line-2); font-variant-numeric: tabular-nums; }
.stab th { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; font-weight: 500; }
.stab th:first-child, .stab td:first-child { text-align: left; font-family: var(--sans); font-size: 14px; }
.stab td.grp { font: 500 11px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .1em; padding-top: 22px; border-bottom: 0; }
.stab td.badc { color: var(--bad); background: rgba(200, 50, 30, .08); font-weight: 500; }
.stab tr.ok td:first-child { font-weight: 600; }
.stab tr.ok td:first-child::after { content: "  \2713"; color: var(--good); }
.stab-foot { display: grid; grid-template-columns: auto 1fr; gap: 24px; padding: 18px 14px 0; align-items: end; }
.stab-foot > div { display: grid; gap: 6px; }
.stab-foot .small { color: var(--muted); text-transform: uppercase; letter-spacing: .1em; }
.stab-foot b { font: 400 34px/1 var(--serif); }
.stab-foot code { justify-self: start; background: transparent; padding: 0; font-size: 13px; color: var(--ink-2); }

/* ------------------------------------------------------------------ tests */
.tests { padding: 140px 0 100px; }
.test-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.test-grid li {
  display: grid; grid-template-columns: 28px 1fr; gap: 12px; align-items: start; padding: 16px 18px; border-radius: 14px;
  background: #FBFAF7; box-shadow: 0 0 0 1px var(--line);
}
.test-grid .ck { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: rgba(42, 140, 120, .12); }
.test-grid .ck svg { width: 14px; height: 14px; stroke: var(--good); stroke-width: 3; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.test-grid .ck.fail { background: rgba(200, 50, 30, .12); }
.test-grid .ck.fail svg { stroke: var(--bad); }
.test-grid p { margin: 0; font-size: 14.5px; line-height: 1.35; }
.test-grid small { display: block; font: 400 11px var(--mono); color: var(--muted); margin-top: 4px; }

/* ------------------------------------------------------------------ code */
.code { padding: 100px 0 140px; }
.code-grid { display: grid; grid-template-columns: 7fr 5fr; gap: 20px; align-items: start; }
.side-cards { display: grid; gap: 20px; }
.code-card { border-radius: 20px; background: var(--ink); color: #E9E6DF; overflow: hidden; box-shadow: 0 40px 80px -50px rgba(17, 19, 22, .6); }
.code-bar { display: flex; align-items: center; gap: 7px; padding: 14px 16px; border-bottom: 1px solid rgba(255, 255, 255, .08); }
.code-bar i { width: 10px; height: 10px; border-radius: 50%; background: rgba(255, 255, 255, .16); }
.code-bar span { margin-left: 10px; color: rgba(233, 230, 223, .6); }
.copy {
  margin-left: auto; border: 0; cursor: pointer; padding: 7px 12px; border-radius: 8px; background: rgba(255, 255, 255, .08); color: inherit; font: 500 12px var(--sans);
  transition: background .25s;
}
.copy:hover { background: rgba(255, 255, 255, .16); }
pre { margin: 0; padding: 22px 24px 26px; overflow-x: auto; font: 400 13.5px/1.75 var(--mono); }
pre code { background: none; padding: 0; font: inherit; }
pre .k { color: #FF9A6E; }
pre .n { color: #9FD3C7; }
pre .c { color: rgba(233, 230, 223, .42); }
.tree { border-radius: 20px; padding: 22px 24px; background: #FBFAF7; box-shadow: 0 0 0 1px var(--line); }
.tree .dl { width: 100%; margin-top: 18px; }
.tree .small { margin: 0 0 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .12em; }
.tree ul { list-style: none; margin: 0; padding: 0; display: grid; }
.tree li { display: flex; justify-content: space-between; gap: 18px; padding: 10px 0; border-bottom: 1px solid var(--line-2); font-size: 14px; }
.tree li:last-child { border-bottom: 0; }
.tree b { font: 500 13px var(--mono); }
.tree span { color: var(--muted); text-align: right; }

/* ------------------------------------------------------------------ close */
.close { padding: 40px 0 140px; }
.close-inner { border-top: 1px solid var(--line); padding-top: 120px; }
.plan { list-style: none; margin: 60px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.plan li { display: grid; gap: 18px; padding: 0 24px 0 0; align-content: start; }
.plan li + li { padding-left: 24px; border-left: 1px solid var(--line); }
.plan span { font: 400 54px/1 var(--serif); color: var(--accent); }
.plan b { font-size: 18px; }
.plan p { margin: 8px 0 0; color: var(--ink-2); font-size: 15px; }

/* ------------------------------------------------------------------ footer */
.foot { padding: 34px 0 44px; border-top: 1px solid var(--line); font-size: 14px; }
.foot-inner { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.foot p { margin: 0; max-width: 70ch; }

/* ------------------------------------------------------------------ reveal defaults (JS adds motion) */
.js .reveal { opacity: 0; transform: translateY(28px); }

/* ------------------------------------------------------------------ responsive */
@media (max-width: 1080px) {
  .method-grid { grid-template-columns: 1fr; gap: 50px; }
  .method-aside { position: static; }
  .proj-fig { max-width: 520px; }
  .code-grid { grid-template-columns: 1fr; }
  .test-grid { grid-template-columns: repeat(2, 1fr); }
  .plan { grid-template-columns: repeat(2, 1fr); row-gap: 40px; }
  .plan li:nth-child(3) { padding-left: 0; border-left: 0; }
}
@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-tag { margin-left: auto; }
  .hero .hero-stats { grid-template-columns: repeat(2, 1fr); width: 100%; margin: 7vh 0 0; padding: 4px 16px 28px; background: var(--paper); border-radius: 26px 26px 0 0; border-top: 0; }
  .stat:nth-child(3) { padding-left: 0; border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--line); margin-top: 18px; }
  .cards { grid-template-columns: 1fr; }
  .stage { height: auto; min-height: 0; display: flex; flex-direction: column; }
  #land { position: relative; height: 62vh; min-height: 380px; }
  .stage-labels { height: 62vh; min-height: 380px; bottom: auto; }
  .stage-panel { position: relative; top: auto; right: auto; width: auto; max-width: none; margin: 0 12px 12px; }
  .stage-hint { top: 16px; bottom: auto; left: 16px; }
  .scroll-cue { display: none; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .wrap { width: calc(100% - 32px); }
  .nav { top: 10px; padding: 8px 8px 8px 14px; }
  .hero-inner { padding-top: 16vh; }
  .hero-sub { font-size: 16px; }
  .btn { height: 50px; padding: 0 20px; }
  .timecode { display: none; }
  .stat, .stat + .stat { padding: 16px 12px 0 0; }
  .stat:nth-child(even) { padding-left: 12px; }
  .stat b { font-size: 38px; }
  .landscape, .failures, .tests { padding-top: 96px; }
  .benchmark, .stability { padding: 110px 0 90px; }
  .method { margin: 0 8px; border-radius: 26px; padding: 100px 0; }
  .step { padding: 24px 20px; }
  .chart { height: 360px; }
  .test-grid { grid-template-columns: 1fr; }
  .plan { grid-template-columns: 1fr; }
  .plan li + li { padding-left: 0; border-left: 0; padding-top: 28px; border-top: 1px solid var(--line); }
  .stab-foot { grid-template-columns: 1fr; }
  .tree li { flex-direction: column; gap: 2px; }
  .tree span { text-align: left; }
  .tabs { display: flex; }
  .tabs button { flex: 1; padding: 11px 10px; }
}
@media (prefers-reduced-motion: reduce) {
  .grain, .rec, .scroll-cue span { animation: none; }
  .js .reveal { opacity: 1; transform: none; }
  .letterbox { display: none; }
}