:root {
  --ink: #121722;
  --paper: #f6f7f9;
  --surface: #fff;
  --muted: #667085;
  --line: #d8dee8;
  --accent: #3557ff;
  --success: #138a58;
  --danger: #b42318;
  --radius-lg: 24px;
  --radius-md: 14px;
  --content-width: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.6; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

.site-header { position: sticky; top: 0; z-index: 2; border-bottom: 1px solid #2e3749; background: var(--ink); color: #fff; }
.header-inner, .hero, .section, .site-footer { width: min(var(--content-width), calc(100% - 48px)); margin-inline: auto; }
.header-inner { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { flex: 0 0 auto; font-weight: 750; text-decoration: none; }
nav { display: flex; flex: 1; gap: 18px; overflow-x: auto; white-space: nowrap; }
nav a { color: #dfe5f3; font-size: .9rem; text-decoration: none; }
nav a:hover { color: #fff; }
.read-only-status { flex: 0 0 auto; border: 1px solid #65718a; border-radius: 999px; padding: 3px 9px; color: #dfe5f3; font-size: .78rem; }

.hero { display: grid; width: 100%; box-sizing: border-box; grid-template-columns: 1.25fr .75fr; gap: 48px; padding: 80px max(24px, calc((100% - var(--content-width)) / 2)); background: var(--ink); color: #fff; }
.eyebrow, .card-label { margin: 0 0 10px; color: var(--accent); font-size: .82rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.hero .eyebrow, .command-card .card-label { color: #bfcaff; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 760px; margin-bottom: 12px; font-size: clamp(2.5rem, 6vw, 4.8rem); line-height: 1.08; letter-spacing: -.05em; }
h2 { margin-bottom: 10px; font-size: clamp(1.7rem, 3vw, 2.5rem); line-height: 1.2; letter-spacing: -.03em; }
h3 { margin-bottom: 8px; font-size: 1.05rem; }
.hero-lead { max-width: 660px; margin-bottom: 12px; color: #fff; font-size: clamp(1.15rem, 2vw, 1.5rem); }
.hero-note { max-width: 660px; color: #c4cede; }
.hero-actions, .control-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 28px; }
.button, .control-row button, .output-tabs button { min-height: 44px; border-radius: 10px; padding: 10px 16px; font-weight: 700; text-decoration: none; }
.button-primary { background: #fff; color: var(--ink); }
.button-secondary { border: 1px solid #7080a4; color: #fff; }
.text-link { color: #dfe5f3; font-weight: 700; }
.command-card { align-self: start; border: 1px solid #3c4760; border-radius: var(--radius-lg); padding: 24px; background: #1d2534; }
.command-card code { display: block; overflow-wrap: anywhere; color: #fff; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .9rem; line-height: 1.65; }
.command-card p:last-child { margin: 18px 0 0; color: #c4cede; font-size: .9rem; }

.section { padding: 72px 0; }
.section-tint { width: 100%; padding-inline: max(24px, calc((100% - var(--content-width)) / 2)); background: var(--surface); }
.section-heading { max-width: 760px; margin-bottom: 28px; }
.section-heading > p:last-child { margin-bottom: 0; color: var(--muted); }
.demo-layout, .two-column, .evidence-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 24px; }
.timeline { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.timeline li { border: 1px solid var(--line); border-left: 4px solid #b9c2d2; border-radius: var(--radius-md); padding: 15px 18px; background: var(--surface); }
.timeline li.is-active { border-left-color: var(--accent); box-shadow: 0 5px 16px rgb(18 23 34 / 8%); }
.timeline li.is-complete { border-left-color: var(--success); }
.timeline li.is-error { border-left-color: var(--danger); }
.timeline strong, .timeline span { display: block; }
.timeline span { margin-top: 3px; color: var(--muted); font-size: .92rem; }
.replay-panel, .output-card, .two-column > div, .evidence-grid article, .guide-copy { border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px; background: var(--surface); }
.replay-panel p { color: var(--muted); }
.control-row button, .output-tabs button { border: 1px solid var(--line); background: var(--surface); color: var(--ink); }
.control-row button:hover, .output-tabs button:hover, .output-tabs button.is-active { border-color: var(--accent); background: #eef0ff; color: #233dcc; }
.status-text { display: flex; gap: 8px; align-items: center; margin: 24px 0 0; font-size: .9rem; }
.status-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--success); }
.replay-detail { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 18px; }
.replay-detail p { margin-bottom: 8px; }
.artifact-label { color: var(--ink) !important; font-weight: 700; }
.replay-detail ul { margin: 0 0 14px; padding-left: 1.2rem; color: var(--muted); }
.replay-detail progress { width: 100%; accent-color: var(--accent); }
.replay-error { margin: 14px 0 0; color: var(--danger) !important; font-weight: 700; }
.output-preview { margin-top: 18px; border: 1px solid var(--accent); border-radius: var(--radius-md); padding: 24px; background: #f7f8ff; }
.output-preview pre { margin: 0; overflow-x: auto; white-space: pre-wrap; overflow-wrap: anywhere; color: var(--muted); font: .9rem/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.static-output-details { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 18px; }
.static-output-details article { border: 1px solid var(--line); border-radius: var(--radius-md); padding: 18px; background: var(--surface); }
.static-output-details pre { margin: 0; overflow-wrap: anywhere; white-space: pre-wrap; color: var(--muted); font: .82rem/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.is-enhanced .static-output-details { display: none; }

.output-tabs { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 8px; }
.output-tabs button { flex: 0 0 auto; }
.output-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 18px; }
.output-card { min-height: 170px; border-radius: var(--radius-md); }
.output-card.is-selected { border-color: var(--accent); box-shadow: 0 4px 14px rgb(53 87 255 / 12%); }
.output-card p { margin-bottom: 0; color: var(--muted); }
.two-column { grid-template-columns: repeat(2, 1fr); }
.two-column ul, .boundary-list { margin: 0; padding-left: 1.2rem; }
.two-column li, .boundary-list li { margin: 8px 0; }
.capability-matrix { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-top: 18px; }
.capability-matrix article { border: 1px solid var(--line); border-radius: var(--radius-md); padding: 18px; background: var(--surface); }
.capability-matrix p { margin: 0; color: var(--muted); font-size: .92rem; }
.evidence-grid { grid-template-columns: repeat(3, 1fr); }
.evidence-grid article { border-radius: var(--radius-md); }
.evidence-grid strong, .evidence-grid span { display: block; }
.evidence-grid strong { font-size: 1.15rem; }
.evidence-grid span { margin-top: 6px; color: var(--muted); font-size: .9rem; }
.boundary-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2px 40px; max-width: 950px; }
.guide-copy { max-width: 850px; }
.guide-copy p:last-child { margin-bottom: 0; }
.site-footer { width: 100%; padding: 28px max(24px, calc((100% - var(--content-width)) / 2)); background: var(--ink); color: #dfe5f3; font-size: .9rem; }
.site-footer p { margin: 0; }
.noscript-notice { position: fixed; right: 16px; bottom: 16px; max-width: 360px; z-index: 3; border: 2px solid var(--danger); border-radius: var(--radius-md); padding: 14px; background: #fff5f4; color: var(--ink); box-shadow: 0 8px 24px rgb(18 23 34 / 16%); }

@media (max-width: 860px) {
  .hero, .demo-layout, .evidence-grid, .capability-matrix { grid-template-columns: 1fr; }
  .hero { gap: 28px; padding-block: 60px; }
  .header-inner { gap: 16px; }
  .read-only-status { display: none; }
  .output-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .header-inner, .section { width: min(var(--content-width), calc(100% - 32px)); }
  .section-tint { padding-inline: 16px; }
  .header-inner { min-height: 56px; }
  .brand { font-size: .9rem; }
  nav { gap: 14px; }
  .hero { padding-block: 48px; padding-inline: 16px; }
  .output-grid, .two-column, .boundary-list, .static-output-details { grid-template-columns: 1fr; }
  .replay-panel, .output-card, .two-column > div, .evidence-grid article, .guide-copy, .command-card { padding: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}