:root {
  color-scheme: dark;
  --ink: #071019;
  --panel: #0c1721;
  --panel-2: #101f2a;
  --line: #203442;
  --text: #edf6f7;
  --muted: #93a9b2;
  --cyan: #58d8ff;
  --lime: #b7ff58;
  --amber: #ffb343;
  --radius: 18px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--ink); color: var(--text); line-height: 1.6; }
a { color: inherit; }
button, select, input { font: inherit; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 20; background: var(--lime); color: var(--ink); padding: .7rem 1rem; border-radius: 6px; }
.skip-link:focus { top: 1rem; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }

.site-header { position: sticky; top: 0; z-index: 10; display: flex; justify-content: space-between; align-items: center; min-height: 72px; padding: 0 clamp(1.2rem, 4vw, 4.5rem); background: rgba(7, 16, 25, .86); border-bottom: 1px solid rgba(88, 216, 255, .12); backdrop-filter: blur(18px); }
.wordmark { display: flex; gap: .65rem; align-items: center; text-decoration: none; font-weight: 750; letter-spacing: -.02em; }
.wordmark-mark { width: 18px; height: 18px; border: 2px solid var(--lime); border-radius: 50%; box-shadow: 0 0 18px rgba(183,255,88,.4); }
nav { display: flex; gap: 1.4rem; }
nav a { color: var(--muted); text-decoration: none; font-size: .88rem; }
nav a:hover { color: var(--text); }

.hero { min-height: calc(100vh - 72px); display: grid; grid-template-columns: minmax(0, .9fr) minmax(420px, 1.1fr); align-items: center; gap: 2rem; padding: 4rem clamp(1.2rem, 6vw, 7rem); overflow: hidden; background: radial-gradient(circle at 72% 40%, rgba(30, 108, 123, .18), transparent 38%); }
.hero-copy { max-width: 670px; }
.eyebrow { margin: 0 0 1.2rem; color: var(--cyan); font-size: .72rem; letter-spacing: .19em; font-weight: 750; }
h1, h2, h3 { margin-top: 0; line-height: 1.03; letter-spacing: -.045em; }
h1 { margin-bottom: 1.6rem; font-size: clamp(4rem, 8vw, 8.8rem); font-weight: 720; }
h1 span { color: var(--lime); }
h2 { margin-bottom: 1.2rem; font-size: clamp(2.5rem, 5.4vw, 5.4rem); max-width: 14ch; }
h3 { font-size: 1.7rem; }
.lede { max-width: 60ch; color: #c4d3d7; font-size: clamp(1.05rem, 1.5vw, 1.35rem); }
.hero-actions { display: flex; gap: .8rem; flex-wrap: wrap; margin: 2rem 0 1rem; }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: .7rem 1.1rem; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; font-weight: 700; }
.button.primary { color: var(--ink); background: var(--lime); border-color: var(--lime); }
.button.secondary { background: rgba(255,255,255,.03); }
.button:hover { transform: translateY(-2px); }
.microcopy { color: var(--muted); font-size: .78rem; }
.hero-visual { position: relative; min-height: 560px; }
.hero canvas { width: 100%; height: auto; filter: drop-shadow(0 25px 70px rgba(0,0,0,.35)); }
.flow-key { position: absolute; right: 8%; bottom: 8%; color: var(--muted); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }
.flow-key span { display: inline-block; width: 70px; height: 2px; margin-right: .6rem; background: linear-gradient(90deg, var(--cyan), var(--lime)); vertical-align: middle; }

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.metrics article { padding: 1.8rem clamp(1rem, 3vw, 3rem); border-right: 1px solid var(--line); }
.metrics article:last-child { border-right: 0; }
.metrics p, .metrics span { margin: 0; color: var(--muted); font-size: .76rem; }
.metrics strong { display: block; margin: .2rem 0; font-size: clamp(1.65rem, 2.5vw, 2.5rem); letter-spacing: -.04em; }

.section-shell { padding: 8rem clamp(1.2rem, 6vw, 7rem); border-bottom: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, .5fr); gap: 4rem; align-items: end; margin-bottom: 3.5rem; }
.section-heading .eyebrow { grid-column: 1 / -1; margin-bottom: -1rem; }
.section-heading p:last-child { color: var(--muted); max-width: 55ch; }
.section-heading.compact { display: block; }

.lab { background: linear-gradient(180deg, #08131c, var(--ink)); }
.lab-grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 1px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--line); }
.canvas-card, .controls { background: var(--panel); }
.canvas-card { position: relative; min-height: 520px; padding: 1rem; }
.canvas-card canvas { width: 100%; height: auto; }
.frame-data { margin: 0 1rem 1rem; border: 1px solid var(--line); border-radius: 10px; background: #08131c; }
.frame-data summary { cursor: pointer; padding: .75rem 1rem; color: var(--cyan); font-weight: 700; }
.table-scroll { max-height: 260px; overflow: auto; border-top: 1px solid var(--line); }
.frame-data table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.frame-data caption { padding: .8rem; color: var(--muted); text-align: left; }
.frame-data th, .frame-data td { padding: .55rem .8rem; border-top: 1px solid rgba(32,52,66,.7); text-align: right; }
.frame-data th:first-child { text-align: left; }
.frame-data thead th { position: sticky; top: 0; color: var(--muted); background: var(--panel); }
.time-readout { position: absolute; left: 2rem; bottom: 1.5rem; display: flex; flex-direction: column; padding: .7rem 1rem; border: 1px solid var(--line); border-radius: 12px; background: rgba(7,16,25,.82); }
.time-readout span { color: var(--muted); font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; }
.controls { display: flex; flex-direction: column; gap: .8rem; padding: 1.5rem; }
.controls label { color: var(--muted); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }
.controls select, .controls button { min-height: 44px; color: var(--text); border: 1px solid var(--line); border-radius: 8px; background: var(--panel-2); }
.controls button:hover { border-color: var(--cyan); }
.control-row { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.controls input[type="range"] { accent-color: var(--lime); width: 100%; }
.scenario-note { margin-top: .7rem; padding: 1rem; border: 1px solid var(--line); border-radius: 10px; }
.scenario-note p { color: var(--muted); font-size: .86rem; }
#mode-pill { display: inline-block; padding: .2rem .55rem; border-radius: 999px; background: rgba(88,216,255,.12); color: var(--cyan); font-size: .7rem; text-transform: uppercase; letter-spacing: .09em; }
.motion-toggle { display: flex; gap: .6rem; align-items: center; text-transform: none !important; letter-spacing: 0 !important; }
.hash-label { margin-top: auto; color: var(--muted); font-size: .72rem; overflow-wrap: anywhere; }
.hash-label code { color: #c7d6da; }

.mode-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.mode-card { min-height: 260px; padding: 1.6rem; background: var(--panel); }
.mode-card:hover { background: var(--panel-2); }
.mode-card .mode-icon { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; height: 78px; margin-bottom: 1.5rem; }
.mode-card .mode-icon i { border-radius: 4px; background: var(--cyan); opacity: calc(.25 + var(--level) * .75); }
.mode-card h3 { margin-bottom: .6rem; text-transform: capitalize; }
.mode-card p { color: var(--muted); font-size: .88rem; }
.mode-card strong { color: var(--lime); }

.method { background: #0a151e; }
.method-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.method-grid article { min-height: 320px; padding: 2rem; background: var(--panel); }
.method-grid article p:last-child { color: var(--muted); }
.card-index { color: var(--cyan); font-size: .7rem; letter-spacing: .13em; }
.equation { color: var(--text) !important; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: clamp(1rem, 1.6vw, 1.35rem); line-height: 1.7; }

.validation { display: grid; grid-template-columns: 1.3fr .7fr; gap: 5rem; align-items: center; background: radial-gradient(circle at 80% 50%, rgba(183,255,88,.1), transparent 32%); }
.validation-copy p:not(.eyebrow) { max-width: 65ch; color: var(--muted); }
.text-link { color: var(--lime); font-weight: 700; text-decoration: none; }
.test-score { padding: 2.3rem; border-left: 1px solid var(--lime); }
.test-score strong { display: block; font-size: clamp(5rem, 10vw, 9rem); line-height: .9; color: var(--lime); letter-spacing: -.08em; }
.test-score strong span { color: var(--muted); font-size: .35em; }
.test-score p { font-size: 1.25rem; }
.test-score small { color: var(--muted); }

.architecture-flow { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; padding: 2rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.architecture-flow span { padding: .8rem 1rem; border: 1px solid var(--line); border-radius: 8px; }
.architecture-flow i { color: var(--muted); font-style: normal; }
.architecture-flow .accent { color: var(--ink); background: var(--lime); border-color: var(--lime); font-family: ui-monospace, monospace; }

.limitations { display: grid; grid-template-columns: .8fr 1.2fr; gap: 4rem; }
.limitations ul { display: grid; gap: 1rem; margin: 0; padding: 0; list-style: none; counter-reset: limits; }
.limitations li { counter-increment: limits; padding: 1rem 0 1rem 3.5rem; border-top: 1px solid var(--line); color: #c1d0d4; }
.limitations li::before { content: "0" counter(limits); float: left; margin-left: -3.5rem; color: var(--amber); font-family: ui-monospace, monospace; }

.reproduce { text-align: center; }
.reproduce h2 { max-width: none; }
.reproduce pre { max-width: 720px; margin: 2rem auto; padding: 1.5rem; overflow: auto; text-align: left; border: 1px solid var(--line); border-radius: 12px; background: #030a0f; color: var(--lime); }
.reproduce .hero-actions { justify-content: center; }
footer { display: flex; justify-content: space-between; gap: 2rem; padding: 2rem clamp(1.2rem, 6vw, 7rem); color: var(--muted); font-size: .75rem; }
.noscript { padding: 1rem; background: var(--amber); color: var(--ink); text-align: center; }

@media (max-width: 900px) {
  nav { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 6rem; }
  .hero-visual { min-height: 420px; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .metrics article:nth-child(2) { border-right: 0; }
  .metrics article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .section-heading, .lab-grid, .validation, .limitations { grid-template-columns: 1fr; }
  .mode-grid { grid-template-columns: repeat(2, 1fr); }
  .method-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  h1 { font-size: 3.8rem; }
  .hero { padding-left: 1.1rem; padding-right: 1.1rem; }
  .hero-visual { min-height: 320px; }
  .section-shell { padding: 5rem 1.1rem; }
  .metrics, .mode-grid { grid-template-columns: 1fr; }
  .metrics article { border-right: 0; border-bottom: 1px solid var(--line); }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}