:root {
  color-scheme: dark;
  --bg: #070a11;
  --sidebar: #090d16;
  --surface: #0d121d;
  --surface-raised: #111827;
  --surface-soft: #151d2b;
  --surface-hover: #1a2434;
  --text: #f5f7fb;
  --muted: #8d99aa;
  --muted-strong: #b5bfcd;
  --line: #202a3a;
  --line-strong: #2b394d;
  --accent: #8b7cff;
  --accent-bright: #a99fff;
  --accent-soft: rgb(139 124 255 / 0.12);
  --cyan: #53d8dc;
  --good: #5ddb9a;
  --good-soft: rgb(93 219 154 / 0.1);
  --warn: #f3be63;
  --bad: #fb7185;
  --shadow: 0 24px 64px rgb(0 0 0 / 0.26);
  --sidebar-width: 262px;
  font-family: Inter, "Segoe UI Variable", "Segoe UI", ui-sans-serif, system-ui, sans-serif;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f5f9;
  --sidebar: #f9fafc;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --surface-soft: #f5f7fb;
  --surface-hover: #eef1f7;
  --text: #111827;
  --muted: #667085;
  --muted-strong: #475467;
  --line: #e1e6ee;
  --line-strong: #cfd6e2;
  --accent: #6657dd;
  --accent-bright: #5748d0;
  --accent-soft: rgb(102 87 221 / 0.09);
  --cyan: #178b94;
  --good: #168a55;
  --good-soft: rgb(22 138 85 / 0.08);
  --warn: #a96812;
  --bad: #c52c4a;
  --shadow: 0 20px 50px rgb(42 52 75 / 0.09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 1rem; }
body { margin: 0; min-width: 320px; min-height: 100vh; background: var(--bg); color: var(--text); }
button, select, textarea, input { font: inherit; }
button, .file-button, .primary-action, .secondary-action, select { min-height: 44px; }
button, .file-button, .primary-action, .secondary-action { cursor: pointer; }

button, .file-button, .primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 1px solid var(--accent);
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  padding: 0.65rem 1rem;
  text-decoration: none;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}
button:hover, .file-button:hover, .primary-action:hover { background: var(--accent-bright); transform: translateY(-1px); box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 20%, transparent); }
button:focus-visible, .file-button:focus-within, select:focus-visible, textarea:focus-visible, input:focus-visible, a:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 65%, white); outline-offset: 3px; }
button.quiet, .secondary-action { background: transparent; color: var(--muted-strong); border: 1px solid var(--line-strong); text-decoration: none; }
button.quiet:hover, .secondary-action:hover { background: var(--surface-hover); color: var(--text); border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
button.compact { min-height: 44px; padding: 0.4rem 0.7rem; border-radius: 8px; font-size: 0.78rem; }

.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; background: var(--warn); color: #111827; padding: 0.7rem 1rem; border-radius: 8px; font-weight: 800; }
.skip-link:focus { top: 1rem; }

.app-shell { display: grid; grid-template-columns: var(--sidebar-width) minmax(0, 1fr); min-height: 100vh; }
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 30;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
  background: var(--sidebar);
  padding: 1.35rem 1rem;
}
.brand-block { display: flex; align-items: center; gap: 0.8rem; padding: 0 0.45rem 1.4rem; }
.brand-block > div { display: grid; gap: 0.16rem; }
.brand-block strong { font-size: 0.94rem; letter-spacing: 0.16em; }
.brand-block > div > span { color: var(--muted); font-size: 0.62rem; letter-spacing: 0.13em; }
.brand-mark { position: relative; display: grid; place-items: center; width: 37px; height: 37px; border: 1px solid color-mix(in srgb, var(--accent) 55%, var(--line)); border-radius: 10px; background: var(--accent-soft); transform: rotate(45deg); }
.brand-mark i { position: absolute; display: block; width: 14px; height: 2px; border-radius: 99px; background: var(--accent-bright); }
.brand-mark i:nth-child(1) { transform: translateY(-5px); }
.brand-mark i:nth-child(3) { transform: translateY(5px); }

.side-nav { border-top: 1px solid var(--line); padding-top: 1.25rem; }
.side-nav > p { margin: 0 0 0.55rem 0.7rem; color: var(--muted); font-size: 0.66rem; font-weight: 800; letter-spacing: 0.13em; text-transform: uppercase; }
.side-nav a { display: flex; align-items: center; gap: 0.7rem; min-height: 44px; margin-bottom: 0.25rem; padding: 0.55rem 0.65rem; border: 1px solid transparent; border-radius: 9px; color: var(--muted-strong); font-size: 0.86rem; font-weight: 650; text-decoration: none; }
.side-nav a:hover { background: var(--surface-hover); color: var(--text); }
.side-nav a.active { border-color: color-mix(in srgb, var(--accent) 30%, var(--line)); background: var(--accent-soft); color: var(--text); }
.nav-icon { display: grid; place-items: center; width: 25px; height: 25px; border-radius: 6px; color: var(--muted); font-size: 0.9rem; }
.side-nav a.active .nav-icon { background: var(--accent); color: #fff; }

.environment-card { margin-top: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); padding: 0.9rem; }
.environment-heading { display: flex; align-items: center; gap: 0.5rem; padding-bottom: 0.75rem; border-bottom: 1px solid var(--line); font-size: 0.76rem; }
.live-dot, .privacy-state i, .section-state i { width: 7px; height: 7px; border-radius: 50%; background: var(--good); box-shadow: 0 0 0 4px var(--good-soft); }
.environment-card dl { display: grid; gap: 0.55rem; margin: 0.8rem 0 0; }
.environment-card dl div { display: flex; justify-content: space-between; gap: 0.5rem; font-size: 0.7rem; }
.environment-card dt { color: var(--muted); }
.environment-card dd { margin: 0; color: var(--muted-strong); font-weight: 700; }
.sidebar-foot { display: flex; gap: 0.65rem; padding: 1.05rem 0.45rem 0; color: var(--muted); }
.sidebar-foot .shield { color: var(--good); font-size: 1.1rem; }
.sidebar-foot p { display: grid; gap: 0.18rem; margin: 0; font-size: 0.65rem; line-height: 1.45; }
.sidebar-foot strong { color: var(--muted-strong); font-size: 0.7rem; }

.app-main { min-width: 0; }
.disclosure { display: flex; align-items: center; justify-content: center; gap: 0.65rem; min-height: 36px; padding: 0.45rem 1rem; border-bottom: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line)); background: var(--accent-soft); }
.disclosure p { margin: 0; color: var(--muted-strong); font-size: 0.72rem; line-height: 1.4; }
.disclosure-tag { flex: none; border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--line)); border-radius: 99px; padding: 0.18rem 0.48rem; color: var(--accent-bright); font-size: 0.6rem; font-weight: 850; letter-spacing: 0.08em; text-transform: uppercase; }

.topbar { min-height: 69px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.8rem clamp(1rem, 3vw, 2.5rem); border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 88%, transparent); }
.topbar-context { display: flex; align-items: center; gap: 0.75rem; }
.topbar-context > div { display: grid; gap: 0.16rem; }
.topbar-context span { color: var(--muted); font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.08em; }
.topbar-context strong { font-size: 0.83rem; }
.topbar-context strong span { color: var(--text); font-size: inherit; text-transform: none; letter-spacing: 0; }
.top-actions { display: flex; align-items: center; gap: 0.55rem; }
.privacy-state { display: flex; align-items: center; gap: 0.5rem; margin-right: 0.45rem; color: var(--muted); font-size: 0.7rem; }
.menu-button { display: none; width: 44px; padding: 0; background: transparent; color: var(--text); border-color: var(--line); }

main { width: min(1280px, calc(100% - clamp(2rem, 6vw, 5rem))); margin: 0 auto; padding-bottom: 4rem; }
.hero { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(290px, 0.72fr); gap: clamp(2rem, 6vw, 5rem); align-items: center; min-height: 430px; padding: clamp(3.5rem, 6vw, 5.25rem) 0; border-bottom: 1px solid var(--line); }
.eyebrow { display: flex; align-items: center; gap: 0.65rem; margin: 0 0 1rem; color: var(--accent-bright); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.11em; text-transform: uppercase; }
.eyebrow > span:first-child { width: 25px; height: 1px; background: var(--accent); }
h1 { max-width: 16ch; margin: 0; font-size: clamp(2.7rem, 4.9vw, 4.5rem); line-height: 1.01; letter-spacing: -0.055em; font-weight: 730; }
.lede { max-width: 62ch; margin: 1.4rem 0 0; color: var(--muted-strong); font-size: clamp(1rem, 1.5vw, 1.15rem); line-height: 1.68; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 2rem; }
.primary-action::after { content: "→"; }
.secondary-action { display: inline-flex; align-items: center; justify-content: center; border-radius: 9px; padding: 0.65rem 1rem; font-weight: 700; }

.assurance-card { align-self: center; border: 1px solid var(--line-strong); border-radius: 16px; background: linear-gradient(145deg, var(--surface-raised), color-mix(in srgb, var(--surface-raised) 82%, var(--accent) 5%)); box-shadow: var(--shadow); overflow: hidden; }
.assurance-top { display: flex; align-items: center; gap: 1rem; padding: 1.25rem; border-bottom: 1px solid var(--line); }
.assurance-top > div:last-child { display: grid; gap: 0.25rem; }
.assurance-top > div > span { color: var(--muted); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; }
.assurance-top strong { font-size: 0.95rem; }
.score-ring { display: grid; place-items: center; width: 65px; height: 65px; flex: none; border-radius: 50%; background: conic-gradient(var(--accent) 0 100%, var(--line) 100%); position: relative; }
.score-ring::before { content: ""; position: absolute; inset: 5px; border-radius: 50%; background: var(--surface-raised); }
.score-ring span { position: relative; z-index: 1; max-width: 5ch; color: var(--accent-bright); font-size: 0.64rem; font-weight: 800; line-height: 1.15; text-align: center; }
.assurance-card ul { display: grid; gap: 0.7rem; list-style: none; margin: 0; padding: 1.1rem 1.25rem; }
.assurance-card li { display: flex; align-items: center; gap: 0.65rem; color: var(--muted-strong); font-size: 0.78rem; }
.assurance-card li > span:first-child { display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-bright); font-size: 0.78rem; }
.assurance-card > p { margin: 0; padding: 0.85rem 1.25rem; border-top: 1px solid var(--line); background: var(--surface); color: var(--muted); font-size: 0.65rem; line-height: 1.5; }

.evidence-section, .workspace, .results { scroll-margin-top: 1rem; padding: clamp(3rem, 6vw, 5rem) 0; border-bottom: 1px solid var(--line); }
.section-kicker { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1.6rem; }
.section-kicker > div { display: flex; align-items: center; gap: 1rem; }
.section-index { display: grid; place-items: center; width: 41px; height: 41px; flex: none; border: 1px solid var(--line-strong); border-radius: 10px; color: var(--accent-bright); font-family: "SFMono-Regular", Consolas, monospace; font-size: 0.72rem; }
.section-kicker p, .card-heading p { margin: 0 0 0.25rem; color: var(--muted); font-size: 0.64rem; font-weight: 800; letter-spacing: 0.11em; text-transform: uppercase; }
.section-kicker h2 { margin: 0; font-size: clamp(1.45rem, 2.6vw, 2.15rem); letter-spacing: -0.035em; }
.section-state { display: flex; align-items: center; gap: 0.55rem; flex: none; border: 1px solid var(--line); border-radius: 99px; background: var(--surface); padding: 0.42rem 0.7rem; color: var(--muted-strong); font-size: 0.68rem; font-weight: 700; }
.section-state.private i { background: var(--cyan); box-shadow: 0 0 0 4px color-mix(in srgb, var(--cyan) 12%, transparent); }
.section-state.validated { border-color: color-mix(in srgb, var(--good) 30%, var(--line)); color: var(--good); }
.section-state.invalid { border-color: color-mix(in srgb, var(--bad) 30%, var(--line)); color: var(--bad); }
.section-state.invalid i { background: var(--bad); box-shadow: 0 0 0 4px color-mix(in srgb, var(--bad) 10%, transparent); }
.section-description { max-width: 75ch; margin: -0.75rem 0 1.5rem 3.6rem; color: var(--muted); font-size: 0.78rem; line-height: 1.55; }

.proof-strip { position: relative; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 1px solid var(--line); border-radius: 14px; background: var(--surface); overflow: hidden; }
.proof-strip article { display: flex; gap: 0.9rem; min-height: 245px; padding: 1.25rem; border-right: 1px solid var(--line); }
.proof-strip article:last-child { border-right: 0; }
.proof-number { color: var(--accent-bright); font-family: "SFMono-Regular", Consolas, monospace; font-size: 0.68rem; }
.proof-strip article > div { display: grid; align-content: start; gap: 0.55rem; }
.proof-strip strong { font-size: 0.88rem; }
.proof-strip article > div > span { color: var(--muted); font-size: 0.76rem; line-height: 1.55; }
.proof-list { display: grid; gap: 0.48rem; list-style: none; margin: 0.25rem 0 0; padding: 0; }
.proof-list li { display: grid; grid-template-columns: 24px minmax(0, 1fr); gap: 0.55rem; align-items: start; color: var(--muted-strong); font-size: 0.7rem; line-height: 1.42; }
.proof-list li > span:first-child { display: grid; place-items: center; width: 24px; height: 24px; border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line)); border-radius: 6px; background: var(--accent-soft); color: var(--accent-bright); font-family: "SFMono-Regular", Consolas, monospace; font-size: 0.58rem; }
.proof-list li > span:last-child { padding-top: 0.18rem; }
.evidence-boundary { display: flex; align-items: flex-start; gap: 0.8rem; margin-top: 0.8rem; padding: 0.9rem 1rem; border: 1px solid color-mix(in srgb, var(--warn) 25%, var(--line)); border-radius: 10px; background: color-mix(in srgb, var(--warn) 5%, var(--surface)); }
.boundary-icon { display: grid; place-items: center; width: 21px; height: 21px; flex: none; border-radius: 50%; background: color-mix(in srgb, var(--warn) 15%, transparent); color: var(--warn); font-size: 0.72rem; font-weight: 900; }
.evidence-boundary p { display: grid; gap: 0.2rem; margin: 0; }
.evidence-boundary strong { color: var(--muted-strong); font-size: 0.72rem; }
.evidence-boundary p span { color: var(--muted); font-size: 0.7rem; line-height: 1.5; }
.evidence-boundary .display-only-note { margin-top: 0.18rem; color: var(--muted-strong); font-weight: 700; }

.workspace-grid { display: grid; grid-template-columns: minmax(0, 1fr) 255px; border: 1px solid var(--line-strong); border-radius: 14px; background: var(--surface); box-shadow: var(--shadow); overflow: hidden; }
.editor-pane { min-width: 0; padding: 1.15rem; }
.editor-toolbar { display: grid; grid-template-columns: minmax(160px, 1fr) auto auto; gap: 0.65rem; align-items: end; margin-bottom: 1rem; }
.scenario-control label, .code-label label { display: block; margin-bottom: 0.4rem; color: var(--muted-strong); font-size: 0.7rem; font-weight: 750; }
select, textarea { width: 100%; border: 1px solid var(--line-strong); background: var(--bg); color: var(--text); }
select { border-radius: 8px; padding: 0.55rem 2rem 0.55rem 0.7rem; }
.code-label { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.code-label > span { color: var(--muted); font-family: "SFMono-Regular", Consolas, monospace; font-size: 0.6rem; letter-spacing: 0.1em; }
textarea { min-height: 390px; resize: vertical; border-radius: 9px; padding: 1rem; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 0.78rem; line-height: 1.62; tab-size: 2; }
#fileInput { position: absolute; inline-size: 1px; block-size: 1px; opacity: 0; }
.file-button { margin: 0; white-space: nowrap; background: transparent; border-color: var(--line-strong); color: var(--muted-strong); }
.file-button:hover { background: var(--surface-hover); color: var(--text); box-shadow: none; }
.editor-actions { display: flex; gap: 0.65rem; margin-top: 0.8rem; }
.validation-rail { display: flex; flex-direction: column; align-items: center; border-left: 1px solid var(--line); background: var(--surface-soft); padding: 1.3rem 1.1rem; text-align: center; }
.rail-label { align-self: stretch; margin: 0 0 1.4rem; color: var(--muted); font-size: 0.64rem; font-weight: 800; letter-spacing: 0.11em; text-align: left; text-transform: uppercase; }
.status-visual { display: grid; place-items: center; width: 64px; height: 64px; border: 1px solid color-mix(in srgb, var(--good) 35%, var(--line)); border-radius: 50%; background: var(--good-soft); color: var(--good); font-size: 1.4rem; }
.status-visual.idle { border-color: var(--line-strong); background: var(--surface); color: var(--muted); }
.status-visual.fail { border-color: color-mix(in srgb, var(--bad) 35%, var(--line)); background: color-mix(in srgb, var(--bad) 9%, transparent); color: var(--bad); }
.status { margin-top: 0.9rem; color: var(--muted); font-size: 0.75rem; font-weight: 800; line-height: 1.45; }
.status.pass { color: var(--good); }
.status.fail { color: var(--bad); }
.validation-rail > p:not(.rail-label) { color: var(--muted); font-size: 0.68rem; line-height: 1.55; }
.validation-rail dl { align-self: stretch; display: grid; gap: 0.65rem; width: 100%; margin: auto 0 0; padding-top: 1rem; border-top: 1px solid var(--line); }
.validation-rail dl div { display: flex; justify-content: space-between; gap: 0.6rem; font-size: 0.67rem; }
.validation-rail dt { color: var(--muted); }
.validation-rail dd { margin: 0; color: var(--muted-strong); font-weight: 700; }

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.75rem; margin-bottom: 0.75rem; }
.metrics article { display: flex; align-items: center; justify-content: space-between; gap: 0.7rem; min-height: 93px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); padding: 1rem; }
.metrics article > div { display: grid; gap: 0.5rem; color: var(--muted); font-size: 0.68rem; }
.metric-icon { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 7px; background: var(--accent-soft); color: var(--accent-bright); font-size: 0.82rem; }
.metrics strong { color: var(--text); font-family: "SFMono-Regular", Consolas, monospace; font-size: 1.7rem; line-height: 1; }
.review-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; }
.review-card { min-width: 0; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); padding: 1rem; }
.review-card.wide { grid-column: 1 / -1; }
.card-heading { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; padding-bottom: 0.85rem; border-bottom: 1px solid var(--line); }
.card-heading h3 { margin: 0; font-size: 0.88rem; }
.card-icon { display: grid; place-items: center; width: 34px; height: 34px; flex: none; border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line)); border-radius: 8px; background: var(--accent-soft); color: var(--accent-bright); }
.chip-list { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.chip { border: 1px solid var(--line); border-radius: 6px; padding: 0.38rem 0.58rem; color: var(--muted); background: var(--surface-soft); font-family: "SFMono-Regular", Consolas, monospace; font-size: 0.7rem; }
.chip.enabled { color: var(--good); border-color: color-mix(in srgb, var(--good) 30%, var(--line)); background: var(--good-soft); }
.chip.hidden { color: var(--muted); text-decoration: line-through; }
.stack-list, .endpoint-list { display: grid; gap: 0; }
.list-row, .endpoint-row { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; min-height: 38px; padding: 0.55rem 0; border-bottom: 1px solid var(--line); font-size: 0.73rem; }
.list-row:last-child, .endpoint-row:last-child { border-bottom: 0; }
.list-row span, .endpoint-row span { overflow-wrap: anywhere; }
.list-row small { color: var(--muted); }
.endpoint-row span { color: var(--muted-strong); font-weight: 700; }
.endpoint-row code { color: var(--cyan); overflow-wrap: anywhere; text-align: right; }
.message { margin: 0; padding: 0.45rem 0; color: var(--muted); font-size: 0.7rem; line-height: 1.5; }
.message.error { color: var(--bad); }
.message.warning { color: var(--warn); }
.message.privacy { color: var(--good); }

footer { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.5rem clamp(1rem, 3vw, 2.5rem); border-top: 1px solid var(--line); color: var(--muted); font-size: 0.66rem; }
footer p { margin: 0; text-align: center; }
.footer-brand { color: var(--muted-strong); font-weight: 850; letter-spacing: 0.14em; }
.sidebar-backdrop { display: none; }

@media (max-width: 1040px) {
  :root { --sidebar-width: 230px; }
  main { width: min(100% - 2.5rem, 1100px); }
  .hero { grid-template-columns: minmax(0, 1fr) 280px; gap: 2rem; }
  .editor-toolbar { grid-template-columns: 1fr 1fr; }
  .scenario-control { grid-column: 1 / -1; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .app-shell { display: block; }
  .sidebar { position: fixed; inset: 0 auto 0 0; width: min(290px, calc(100vw - 48px)); height: 100dvh; transform: translateX(-105%); transition: transform 180ms ease; box-shadow: 20px 0 60px rgb(0 0 0 / 0.35); }
  body.nav-open { overflow: hidden; }
  body.nav-open .sidebar { transform: translateX(0); }
  .sidebar-backdrop { position: fixed; inset: 0; z-index: 25; display: block; background: rgb(0 0 0 / 0.55); }
  .sidebar-backdrop[hidden] { display: none; }
  .menu-button { display: inline-flex; }
  .privacy-state { display: none; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .assurance-card { width: min(100%, 430px); }
  .workspace-grid { grid-template-columns: 1fr; }
  .validation-rail { align-items: flex-start; border-left: 0; border-top: 1px solid var(--line); text-align: left; }
  .rail-label { margin-bottom: 1rem; }
  .status-visual { width: 48px; height: 48px; }
  .validation-rail dl { margin-top: 1rem; }
}

@media (max-width: 620px) {
  main { width: min(100% - 1.25rem, 1100px); }
  .disclosure { align-items: flex-start; justify-content: flex-start; gap: 0.45rem; padding: 0.6rem 0.65rem; }
  .disclosure p { font-size: 0.62rem; }
  .disclosure-tag { font-size: 0.52rem; }
  .topbar { min-height: 62px; padding: 0.6rem 0.65rem; }
  .topbar-context > div { display: none; }
  .top-actions { margin-left: auto; }
  h1 { max-width: 17ch; font-size: clamp(2.05rem, 10vw, 2.75rem); }
  .hero { gap: 2.5rem; padding: 3.25rem 0; }
  .lede { font-size: 0.92rem; }
  .hero-actions { display: grid; grid-template-columns: 1fr; }
  .assurance-card { width: 100%; }
  .section-kicker { align-items: flex-start; }
  .section-kicker > div { align-items: flex-start; }
  .section-state { display: none; }
  .section-kicker h2 { font-size: 1.35rem; }
  .evidence-section, .workspace, .results { padding: 3rem 0; }
  .proof-strip { grid-template-columns: 1fr; }
  .proof-strip article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .proof-strip article:last-child { border-bottom: 0; }
  .evidence-boundary { padding: 0.8rem; }
  .editor-pane { padding: 0.8rem; }
  .editor-toolbar { grid-template-columns: 1fr; }
  .scenario-control { grid-column: auto; }
  .editor-toolbar button, .file-button { width: 100%; }
  textarea { min-height: 320px; font-size: 0.7rem; }
  .editor-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .metrics { grid-template-columns: 1fr 1fr; gap: 0.5rem; }
  .metrics article { min-height: 86px; padding: 0.8rem; }
  .metrics article > div { font-size: 0.62rem; }
  .metrics strong { font-size: 1.45rem; }
  .review-grid { grid-template-columns: 1fr; }
  .review-card.wide { grid-column: auto; }
  .endpoint-row { display: grid; gap: 0.25rem; }
  .endpoint-row code { text-align: left; }
  .section-description { margin-left: 0; }
  footer { display: grid; justify-items: center; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}