/* Rabit — landing page styles */
:root {
  --bg-page: #FAFAF7;
  --bg-elevated: #FFFFFF;
  --bg-sunken: #F2F1EB;
  --ink-primary: #0A0A0A;
  --ink-secondary: #3F3F3C;
  --ink-muted: #6B6B66;
  --rule: #DEDCD3;
  --rule-strong: #B8B6AC;
  --accent: #B45309;
  --accent-subtle: #FEF3C7;
  --ok: #166534;
  --deny: #991B1B;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Source Serif 4", "IBM Plex Serif", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.333rem;
  --text-2xl: 1.777rem;
  --text-3xl: 2.369rem;
  --text-4xl: 3.157rem;
  --text-hero: clamp(2.75rem, 1.2rem + 4.5vw, 4.75rem);

  --leading-tight: 1.05;
  --leading-snug: 1.2;
  --leading-body: 1.55;
  --leading-mono: 1.6;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg-page);
  color: var(--ink-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}

body { overflow-x: clip; }

::selection { background: var(--accent-subtle); color: var(--ink-primary); }

button, input, textarea { font-family: inherit; font-size: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
a { color: inherit; text-decoration: none; }

*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---- layout ---- */
.page { max-width: 1280px; margin: 0 auto; padding: 0 32px; }
.section { padding: 120px 0; border-top: 1px solid var(--rule); }
.section:first-of-type { border-top: none; }

@media (max-width: 1024px) { .section { padding: 88px 0; } .page { padding: 0 28px; } }
@media (max-width: 768px)  { .section { padding: 72px 0; } .page { padding: 0 22px; } }
@media (max-width: 480px)  { .section { padding: 56px 0; } .page { padding: 0 18px; } }

/* ---- mono eyebrow ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: inline-block;
  margin-bottom: 28px;
}

/* ---- headings ---- */
.h1 {
  font-family: var(--font-serif);
  font-size: var(--text-hero);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
  font-weight: 400;
  color: var(--ink-primary);
  text-wrap: balance;
}
.h2 {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  line-height: var(--leading-snug);
  letter-spacing: -0.015em;
  font-weight: 400;
  color: var(--ink-primary);
  text-wrap: balance;
  max-width: 22ch;
}
.h3 {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  line-height: var(--leading-snug);
  letter-spacing: -0.015em;
  font-weight: 400;
}
.h4 {
  font-family: var(--font-sans);
  font-size: var(--text-xl);
  line-height: 1.3;
  font-weight: 500;
}

.lead {
  font-size: var(--text-lg);
  color: var(--ink-secondary);
  max-width: 65ch;
  margin-top: 20px;
  line-height: 1.5;
}
.body { font-size: var(--text-base); color: var(--ink-primary); line-height: var(--leading-body); }

.mono { font-family: var(--font-mono); }
.mono-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

/* ---- nav ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 247, 0.85);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 16px 32px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-brand { display: flex; align-items: center; gap: 10px; }
.nav-logo { width: 26px; height: 26px; display: block; flex-shrink: 0; }
.nav-mark { font-family: var(--font-serif); font-size: 22px; letter-spacing: -0.01em; line-height: 1; position: relative; top: 1px; }
.nav-version { font-family: var(--font-mono); font-size: 11px; color: var(--ink-muted); letter-spacing: 0.08em; text-transform: uppercase; }
.nav-links { display: flex; gap: 28px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-secondary); }
.nav-links a:hover { color: var(--ink-primary); }
.nav-cta {
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 9px 14px;
  background: var(--ink-primary); color: var(--bg-elevated);
  border-radius: 4px;
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-version { display: none; }
}

/* ---- buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-sans); font-size: 15px; font-weight: 500;
  padding: 13px 20px;
  border-radius: 4px;
  transition: transform 0.12s ease, background 0.12s ease;
  line-height: 1;
  min-height: 44px;
}
.btn-primary { background: var(--accent); color: #FFFFFF; }
.btn-primary:hover { background: #92400E; }
.btn-primary:active { transform: translateY(1px); }
.btn-secondary { color: var(--ink-primary); padding: 13px 4px; }
.btn-secondary:hover { color: var(--accent); }
.btn-secondary .arrow { transition: transform 0.15s ease; }
.btn-secondary:hover .arrow { transform: translateX(3px); }

/* ---- hero ---- */
.hero {
  padding-top: 100px; padding-bottom: 120px;
  border-top: none;
}
.hero-grid {
  display: grid; grid-template-columns: 7fr 5fr; gap: 72px;
  align-items: start;
}
@media (max-width: 1024px) { .hero-grid { grid-template-columns: 1fr; gap: 56px; } }

.hero-sub { max-width: 40ch; margin-top: 24px; font-size: var(--text-lg); color: var(--ink-secondary); }
.hero-cta-row { display: flex; gap: 24px; align-items: center; margin-top: 36px; flex-wrap: wrap; }
.hero-meta {
  margin-top: 44px;
  font-family: var(--font-mono); font-size: var(--text-xs); color: var(--ink-muted);
  letter-spacing: 0.06em; text-transform: uppercase; line-height: 1.8;
  padding-top: 22px; border-top: 1px solid var(--rule);
  max-width: 60ch;
}
.hero-meta span { display: inline; }
.hero-meta .sep { color: var(--rule-strong); padding: 0 8px; }

/* ---- hero pipeline (signature viz) ---- */
.hero-viz {
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 28px 26px 22px;
  position: relative;
  min-height: 380px;
}
.hero-viz-stamp {
  position: absolute;
  bottom: 18px;
  right: 22px;
  width: 38px;
  height: 38px;
  opacity: 0.08;
  pointer-events: none;
}
.viz-label {
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-muted);
  letter-spacing: 0.08em; text-transform: uppercase;
  display: flex; justify-content: space-between;
  margin-bottom: 26px;
}
.viz-svg { width: 100%; height: 220px; display: block; }

.stage-node rect { fill: var(--bg-elevated); stroke: var(--rule-strong); stroke-width: 1; transition: stroke 0.25s ease, fill 0.25s ease; }
.stage-node.active rect { stroke: var(--accent); stroke-width: 1.5; }
.stage-node.done rect { stroke: var(--ink-primary); }
.stage-node text { font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.04em; fill: var(--ink-muted); text-transform: uppercase; }
.stage-node.active text, .stage-node.done text { fill: var(--ink-primary); }
.stage-node-idx { font-family: var(--font-mono); font-size: 8px; fill: var(--ink-muted); }

.trunk-line { fill: none; stroke: var(--rule-strong); stroke-width: 1; }
.trunk-line.drawn { stroke-dasharray: 700; stroke-dashoffset: 700; animation: drawTrunk 800ms ease forwards; }
@keyframes drawTrunk { to { stroke-dashoffset: 0; } }

.packet { fill: var(--accent); }

.verdict-chip {
  margin-top: 22px;
  padding: 10px 14px;
  border: 1px solid var(--rule);
  border-left: 2px solid var(--accent);
  border-radius: 3px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-primary);
  background: var(--bg-sunken);
  display: flex; justify-content: space-between; align-items: center;
  letter-spacing: 0.02em;
  opacity: 0; transition: opacity 0.4s ease;
}
.verdict-chip.visible { opacity: 1; }
.verdict-chip .ok { color: var(--ok); }

.viz-replay {
  position: absolute; top: 22px; right: 22px;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.08em; text-transform: uppercase;
}
.viz-replay:hover { color: var(--ink-primary); }

/* ---- section header composition ---- */
.sec-head { max-width: 1120px; }
.sec-head .lead { margin-top: 24px; max-width: 65ch; }

/* ---- timeline (§ 01) ---- */
.timeline {
  margin-top: 72px;
  position: relative;
  max-width: 1120px;
}
.timeline-rule {
  position: absolute; left: 50%; top: 0; bottom: 0; width: 1px;
  background: var(--rule-strong);
  transform-origin: top center; transform: scaleY(0);
  transition: transform 1.2s cubic-bezier(.22,1,.36,1);
}
.timeline.visible .timeline-rule { transform: scaleY(1); }
.timeline-row {
  display: grid; grid-template-columns: 1fr 1fr;
  position: relative; margin-bottom: 48px;
}
.timeline-row:last-child { margin-bottom: 0; }
.timeline-row.right .tl-card { grid-column: 2; padding-left: 56px; }
.timeline-row.left .tl-card { grid-column: 1; padding-right: 56px; text-align: right; }
.tl-card {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(.22,1,.36,1);
}
.timeline-row.visible .tl-card { opacity: 1; transform: translateY(0); }

.tl-date {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); letter-spacing: 0.08em;
  padding-bottom: 4px;
}
.tl-cve {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--accent); letter-spacing: 0.05em;
  margin-bottom: 10px;
}
.tl-name { font-family: var(--font-serif); font-size: var(--text-xl); margin-bottom: 8px; letter-spacing: -0.01em; }
.tl-desc { color: var(--ink-secondary); font-size: 15px; margin-bottom: 18px; }
.tl-rule { height: 1px; background: var(--rule); margin: 0 0 14px; }
.tl-closed-label {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 6px;
}
.tl-closed { font-size: 14px; color: var(--ink-primary); line-height: 1.5; }

.timeline-dot {
  position: absolute; left: 50%; top: 8px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--bg-page);
  border: 1.5px solid var(--rule-strong);
  transform: translateX(-50%);
  transition: border-color 0.3s ease;
}
.timeline-row.visible .timeline-dot { border-color: var(--accent); }

@media (max-width: 768px) {
  .timeline-rule { left: 12px; }
  .timeline-row { grid-template-columns: 1fr; }
  .timeline-row.right .tl-card,
  .timeline-row.left .tl-card {
    grid-column: 1; padding-left: 40px; padding-right: 0; text-align: left;
  }
  .timeline-dot { left: 12px; }
}

/* ---- properties panes ---- */
.panes {
  margin-top: 72px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
@media (max-width: 1024px) { .panes { grid-template-columns: 1fr; gap: 20px; } }

.pane {
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 24px;
  display: flex; flex-direction: column;
  min-height: 440px;
}
.pane-idx { font-family: var(--font-mono); font-size: 11px; color: var(--ink-muted); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 14px; }
.pane h4 { font-family: var(--font-sans); font-size: 16px; font-weight: 500; line-height: 1.35; color: var(--ink-primary); margin-bottom: 14px; letter-spacing: -0.01em; }
.pane h4 .std { color: var(--ink-muted); font-family: var(--font-mono); font-size: 11px; display: block; margin-top: 4px; letter-spacing: 0.05em; text-transform: uppercase; }
.pane-body { flex: 1; display: flex; flex-direction: column; gap: 12px; }

/* YAML block inside pane */
.yaml-mini {
  background: var(--bg-sunken);
  border-radius: 4px;
  padding: 14px 16px;
  font-family: var(--font-mono); font-size: 11.5px; line-height: 1.65;
  color: var(--ink-primary);
  border: 1px solid var(--rule);
}
.yaml-mini .yk { color: var(--ink-primary); }
.yaml-mini .yv { color: var(--ink-secondary); }
.yaml-mini .ys { color: #7C4A10; }
.yaml-mini .yc { color: var(--ink-muted); font-style: normal; }
.yaml-mini .yline { display: block; padding: 0 6px; margin: 0 -6px; border-radius: 2px; transition: background 0.4s ease; }
.yaml-mini .yline.hl { background: var(--accent-subtle); }

/* CLI block */
.cli {
  background: #111111; color: #E8E6DC;
  border-radius: 4px;
  padding: 14px 16px;
  font-family: var(--font-mono); font-size: 11.5px; line-height: 1.7;
  flex: 1; overflow: hidden;
  border: 1px solid #222;
}
.cli .prompt { color: #6B6B66; }
.cli .deny { color: #F87171; }
.cli .ok { color: #86EFAC; }
.cli .muted { color: #9CA3AF; }
.cli .accent { color: #FBBF24; }
.cli .line { white-space: pre-wrap; word-break: break-all; min-height: 1.7em; }

.layer-badges { display: flex; gap: 8px; margin: 8px 0 4px; flex-wrap: wrap; }
.layer-badge {
  font-family: var(--font-mono); font-size: 10px;
  padding: 4px 8px;
  border: 1px solid var(--rule-strong);
  color: var(--ink-muted);
  border-radius: 3px;
  letter-spacing: 0.06em; text-transform: uppercase;
  transition: all 0.3s ease;
}
.layer-badge.lit { border-color: var(--accent); color: var(--ink-primary); background: var(--accent-subtle); }

/* socket viz */
.socket-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 10px;
  background: var(--bg-sunken);
  border: 1px solid var(--rule);
  border-radius: 4px;
}
.socket-node {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 10px; color: var(--ink-muted);
  letter-spacing: 0.05em; text-transform: uppercase;
}
.socket-node .circ {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1.5px solid var(--rule-strong);
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-elevated);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.socket-line { flex: 1; height: 1px; background: var(--rule-strong); margin: 0 14px; position: relative; }
.socket-line::after {
  content: ""; position: absolute; right: -1px; top: -3px;
  border-left: 6px solid var(--rule-strong); border-top: 3.5px solid transparent; border-bottom: 3.5px solid transparent;
}
.pane.deny .socket-node.target .circ { border-color: var(--deny); animation: shake 0.32s ease; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

.chip-footer {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.05em; text-transform: uppercase;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--rule);
}
.chip-footer .ok { color: var(--ok); }

/* merkle svg */
.merkle-wrap {
  background: var(--bg-sunken);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 18px 12px 12px;
}
.merkle-svg { width: 100%; height: 140px; }
.merkle-svg .edge { fill: none; stroke: var(--rule-strong); stroke-width: 1; }
.merkle-svg .edge.tampered { stroke: var(--deny); }
.merkle-svg rect { fill: var(--bg-elevated); stroke: var(--rule-strong); stroke-width: 1; }
.merkle-svg rect.root { stroke: var(--accent); stroke-width: 1.5; }
.merkle-svg rect.tampered { stroke: var(--deny); stroke-width: 1.5; }
.merkle-svg text { font-family: var(--font-mono); font-size: 8.5px; fill: var(--ink-primary); }
.merkle-svg text.lbl { fill: var(--ink-muted); font-size: 7.5px; }

.merkle-toggle {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.05em; text-transform: uppercase;
  margin-top: 10px;
  padding: 6px 10px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  align-self: flex-start;
}
.merkle-toggle:hover { color: var(--ink-primary); border-color: var(--rule-strong); }

/* ---- pipeline section (§03) ---- */
.pipeline-section { }
.pipeline-diagram {
  margin-top: 48px;
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 40px 32px;
  position: relative;
}
.big-pipe-svg { width: 100%; height: 160px; display: block; }
.big-stage rect { fill: var(--bg-elevated); stroke: var(--rule-strong); stroke-width: 1; transition: all 0.3s ease; }
.big-stage.active rect { stroke: var(--accent); stroke-width: 1.5; fill: #FFFBF1; }
.big-stage .lbl-idx { font-family: var(--font-mono); font-size: 9px; fill: var(--ink-muted); letter-spacing: 0.08em; }
.big-stage .lbl-name { font-family: var(--font-mono); font-size: 11px; fill: var(--ink-primary); letter-spacing: 0.06em; font-weight: 500; }
.big-stage.active .lbl-name { fill: var(--accent); }

.stage-panels {
  margin-top: 48px;
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px;
}
@media (max-width: 1024px) { .stage-panels { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .stage-panels { grid-template-columns: 1fr; } }

.stage-panel {
  border-top: 1px solid var(--rule);
  padding-top: 20px;
  transition: border-color 0.3s ease;
}
.stage-panel.active { border-top-color: var(--accent); }
.stage-panel .stage-idx {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); letter-spacing: 0.08em;
  margin-bottom: 10px; text-transform: uppercase;
}
.stage-panel.active .stage-idx { color: var(--accent); }
.stage-panel p { font-size: 13.5px; color: var(--ink-secondary); line-height: 1.55; }

/* ---- standards grid (§04) ---- */
.std-grid {
  margin-top: 56px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px 32px;
}
@media (max-width: 1024px) { .std-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .std-grid { grid-template-columns: 1fr; } }

.std-col { border-top: 1px solid var(--rule-strong); padding-top: 20px; }
.std-id {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-primary); letter-spacing: 0.06em;
  margin-bottom: 16px; text-transform: uppercase;
}
.std-item { margin-bottom: 14px; }
.std-item .k {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--accent); letter-spacing: 0.04em;
  text-transform: uppercase; margin-bottom: 2px;
}
.std-item .v { font-size: 13.5px; color: var(--ink-secondary); line-height: 1.5; }

.std-stat {
  margin-top: 72px;
  padding: 28px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.3vw, 18px);
  color: var(--ink-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
}
.std-stat .emph { color: var(--accent); }
.std-stat .sep { color: var(--rule-strong); padding: 0 10px; }

/* ---- positioning (§05) ---- */
.pos-grid {
  margin-top: 56px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 44px 48px;
  max-width: 1120px;
}
@media (max-width: 768px) { .pos-grid { grid-template-columns: 1fr; gap: 36px; } }
.pos-item { border-top: 1px solid var(--rule); padding-top: 22px; }
.pos-item h3 {
  font-family: var(--font-serif); font-size: var(--text-xl);
  line-height: 1.3; letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.pos-item p { color: var(--ink-secondary); font-size: 15px; line-height: 1.6; max-width: 55ch; }
.pos-item p code {
  font-family: var(--font-mono); font-size: 12.5px;
  background: var(--bg-sunken); padding: 1px 5px; border-radius: 2px;
  color: var(--ink-primary);
}

/* ---- alternatives (§06) ---- */
.alt-grid {
  margin-top: 56px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
@media (max-width: 1024px) { .alt-grid { grid-template-columns: 1fr; gap: 20px; } }

.alt-card {
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 28px 26px;
  display: flex; flex-direction: column;
  min-height: 380px;
}
.alt-card.emph { border-left: 2px solid var(--accent); }
.alt-head {
  font-family: var(--font-serif); font-size: var(--text-xl);
  line-height: 1.3; letter-spacing: -0.01em;
  margin-bottom: 8px;
}
.alt-meta {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); letter-spacing: 0.04em;
  margin-bottom: 18px;
}
.alt-desc { font-size: 14px; color: var(--ink-secondary); line-height: 1.55; margin-bottom: 20px; }
.alt-inherit-label {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.1em; text-transform: uppercase;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  margin-bottom: 12px;
}
.alt-list { list-style: none; padding: 0; margin: 0; }
.alt-list li {
  font-size: 13.5px; color: var(--ink-primary); line-height: 1.5;
  padding: 7px 0 7px 18px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.alt-list li::before {
  content: "—"; position: absolute; left: 0; top: 7px;
  color: var(--ink-muted); font-family: var(--font-mono); font-size: 12px;
}
.alt-list li:last-child { border-bottom: none; }

/* ---- proof (§07) ---- */
.proof-arch {
  margin-top: 48px;
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 40px 32px;
}
.arch-caption {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.08em;
  text-transform: uppercase; margin-bottom: 26px;
  display: flex; justify-content: space-between;
}
.arch-svg { width: 100%; height: auto; display: block; }

.code-row {
  margin-top: 48px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
}
@media (max-width: 900px) { .code-row { grid-template-columns: 1fr; } }

.code-block {
  background: var(--bg-sunken);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
}
.code-block .cap {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  display: flex; justify-content: space-between;
  background: var(--bg-elevated);
}
.code-block pre {
  font-family: var(--font-mono); font-size: 12.5px;
  line-height: 1.7;
  padding: 18px 20px;
  color: var(--ink-primary);
  white-space: pre;
  overflow-x: auto;
}
.code-block pre .yk { color: #0A0A0A; font-weight: 500; }
.code-block pre .ys { color: #7C4A10; }
.code-block pre .yc { color: var(--ink-muted); }

.verifier {
  background: #111111;
  border: 1px solid #222;
  border-radius: 6px;
  overflow: hidden;
}
.verifier .cap {
  font-family: var(--font-mono); font-size: 10px;
  color: #9CA3AF; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 12px 16px;
  border-bottom: 1px solid #222;
  background: #0C0C0C;
  display: flex; justify-content: space-between;
}
.verifier pre {
  font-family: var(--font-mono); font-size: 12.5px;
  color: #E8E6DC;
  padding: 18px 20px;
  line-height: 1.75;
  white-space: pre;
  overflow-x: auto;
}
.verifier pre .ok { color: #86EFAC; }
.verifier pre .muted { color: #6B6B66; }
.verifier pre .prompt { color: #6B6B66; }

.proof-foot {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 16px;
}
.proof-foot .note {
  font-family: var(--font-mono); font-size: 13px;
  color: var(--ink-primary); letter-spacing: 0.01em;
  max-width: 60ch;
}

/* ---- audit chain blocks ---- */
.chain-row {
  margin-top: 48px;
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 0;
  position: relative;
}
@media (max-width: 900px) { .chain-row { grid-template-columns: repeat(2, 1fr); } }
.chain-block {
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  padding: 16px 14px;
  position: relative;
  cursor: pointer;
  transition: border-color 0.2s ease;
}
.chain-block:hover { border-color: var(--rule-strong); }
.chain-block.tampered { border-color: var(--deny); border-width: 1.5px; }
.chain-block .idx { font-family: var(--font-mono); font-size: 10px; color: var(--ink-muted); letter-spacing: 0.08em; margin-bottom: 8px; }
.chain-block .hash { font-family: var(--font-mono); font-size: 11px; color: var(--ink-primary); letter-spacing: 0.02em; }
.chain-block .prev { font-family: var(--font-mono); font-size: 9.5px; color: var(--ink-muted); margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--rule); }
.chain-block.tampered .hash { color: var(--deny); }
.chain-connector {
  position: absolute; top: 50%; right: -8px;
  width: 16px; height: 1px; background: var(--rule-strong);
  transform: translateY(-50%); z-index: 2;
}
.chain-block:last-child .chain-connector { display: none; }
.chain-connector.broken { background: var(--deny); }

/* ---- personas (§08) ---- */
.persona-grid {
  margin-top: 56px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
}
@media (max-width: 1024px) { .persona-grid { grid-template-columns: 1fr; } }

.persona-card {
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 32px 30px;
}
.persona-card .tag {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 12px;
}
.persona-card h3 {
  font-family: var(--font-serif); font-size: var(--text-2xl);
  letter-spacing: -0.015em; margin-bottom: 16px;
  line-height: 1.2;
}
.persona-card p {
  font-size: 15px; color: var(--ink-secondary); line-height: 1.6;
  max-width: 48ch;
}

/* ---- CTA (§09) ---- */
.cta-section { padding: 140px 0 120px; text-align: center; }
@media (max-width: 768px) { .cta-section { padding: 96px 0 80px; } }
.cta-inner { max-width: 760px; margin: 0 auto; }
.cta-inner .eyebrow { margin-bottom: 24px; }
.cta-inner h2 {
  font-family: var(--font-serif); font-size: var(--text-4xl);
  line-height: 1.1; letter-spacing: -0.02em;
  font-weight: 400;
  max-width: 20ch; margin: 0 auto;
}
@media (max-width: 640px) { .cta-inner h2 { font-size: var(--text-3xl); } }
.cta-inner p {
  margin: 28px auto 0;
  font-size: var(--text-lg); color: var(--ink-secondary);
  max-width: 55ch; line-height: 1.55;
}

.cal-embed {
  margin: 48px auto 0;
  max-width: 720px;
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 32px 28px;
  text-align: left;
}
.cal-head {
  display: flex; justify-content: space-between; align-items: baseline;
  padding-bottom: 18px; border-bottom: 1px solid var(--rule);
  margin-bottom: 20px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); letter-spacing: 0.06em; text-transform: uppercase;
}
.cal-head .slot-name { color: var(--ink-primary); letter-spacing: 0.02em; font-family: var(--font-sans); font-size: 15px; text-transform: none; font-weight: 500; }
.cal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 640px) { .cal-grid { grid-template-columns: 1fr; } }
.cal-cal-header {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); letter-spacing: 0.08em;
  text-transform: uppercase; margin-bottom: 12px;
  display: flex; justify-content: space-between;
}
.cal-days { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; font-family: var(--font-mono); font-size: 10px; color: var(--ink-muted); text-align: center; letter-spacing: 0.05em; margin-bottom: 8px; }
.cal-grid-days { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.cal-day {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--ink-primary); border-radius: 2px; cursor: pointer;
  border: 1px solid transparent;
}
.cal-day.muted { color: var(--rule-strong); cursor: default; }
.cal-day.avail:hover { border-color: var(--rule-strong); }
.cal-day.selected { background: var(--ink-primary); color: #fff; }
.cal-day.today { border-color: var(--accent); }

.cal-slots { display: flex; flex-direction: column; gap: 6px; max-height: 220px; overflow-y: auto; padding-right: 2px; }
.cal-slot {
  font-family: var(--font-mono); font-size: 12px;
  padding: 10px 12px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  text-align: center;
  color: var(--ink-primary);
  background: var(--bg-page);
  letter-spacing: 0.02em;
  transition: all 0.12s ease;
}
.cal-slot:hover { border-color: var(--accent); background: #FFFBF1; }
.cal-slot.picked { background: var(--accent); color: #fff; border-color: var(--accent); }

.cal-form { margin-top: 24px; display: flex; flex-direction: column; gap: 12px; padding-top: 20px; border-top: 1px solid var(--rule); }
.cal-prefill-hint {
  margin-top: 20px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); letter-spacing: 0.04em;
  line-height: 1.6;
}
.cal-form label { font-family: var(--font-mono); font-size: 10px; color: var(--ink-muted); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 4px; display: block; }
.cal-form input, .cal-form textarea {
  width: 100%;
  border: 1px solid var(--rule);
  background: var(--bg-page);
  padding: 10px 12px;
  border-radius: 3px;
  font-family: var(--font-sans); font-size: 14px;
  color: var(--ink-primary);
}
.cal-form input:focus, .cal-form textarea:focus { border-color: var(--accent); outline: none; }
.cal-form textarea { min-height: 80px; resize: vertical; font-family: var(--font-sans); }
.cal-form .submit {
  margin-top: 8px;
  padding: 12px 20px;
  background: var(--accent); color: #fff;
  border-radius: 4px;
  font-size: 14px; font-weight: 500;
  align-self: flex-start;
}
.cal-form .submit:hover { background: #92400E; }

.cta-foot {
  font-family: var(--font-mono); font-size: var(--text-sm);
  color: var(--ink-muted); letter-spacing: 0.05em;
  margin-top: 32px;
  text-transform: uppercase;
}
.cta-foot .sep { color: var(--rule-strong); padding: 0 10px; }

/* ---- footer ---- */
.foot { border-top: 1px solid var(--rule); padding: 64px 0 40px; margin-top: 0; }
.foot-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
}
@media (max-width: 768px) { .foot-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
@media (max-width: 480px) { .foot-grid { grid-template-columns: 1fr; gap: 28px; } }

.foot h4 {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.1em;
  text-transform: uppercase; margin-bottom: 14px; font-weight: 400;
}
.foot-mark { font-family: var(--font-serif); font-size: 28px; letter-spacing: -0.01em; margin-bottom: 10px; display: flex; align-items: center; gap: 12px; }
.foot-logo { width: 36px; height: 36px; display: block; }
.foot-tag { font-family: var(--font-mono); font-size: 11px; color: var(--ink-muted); letter-spacing: 0.05em; text-transform: uppercase; max-width: 32ch; line-height: 1.6; }
.foot ul { list-style: none; }
.foot li { margin-bottom: 8px; }
.foot a { font-size: 13px; color: var(--ink-secondary); }
.foot a:hover { color: var(--ink-primary); }
.foot-bottom {
  margin-top: 56px; padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); letter-spacing: 0.05em;
  text-transform: uppercase; flex-wrap: wrap; gap: 12px;
}

/* ---- threat model (§08) ---- */
.threat-sub { margin-top: 64px; }
.threat-sub:first-of-type { margin-top: 56px; }
.threat-sub-head { margin-bottom: 28px; }
.threat-sub-id {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--accent); letter-spacing: 0.08em;
  text-transform: uppercase; margin-bottom: 10px;
}
.threat-sub-note {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--ink-muted); letter-spacing: 0.02em;
  max-width: 60ch;
}
.threat-timeline { margin-top: 0; }

.stride-table {
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule);
}
.stride-row {
  display: grid;
  grid-template-columns: 1fr 2fr 2.4fr;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 14px;
  color: var(--ink-secondary);
  line-height: 1.55;
}
.stride-row:last-child { border-bottom: none; }
.stride-row.stride-head {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted); letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 12px 0;
}
.stride-cat {
  font-family: var(--font-sans); font-weight: 500;
  font-size: 14px; color: var(--ink-primary);
  display: flex; align-items: baseline; gap: 8px;
}
.stride-letter {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.04em;
  font-weight: 500;
  display: inline-block;
  min-width: 14px;
}
@media (max-width: 768px) {
  .stride-row { grid-template-columns: 1fr; gap: 8px; padding: 16px 0; }
  .stride-row.stride-head { display: none; }
  .stride-row > div + div::before {
    content: attr(data-label);
  }
}

.threat-std-grid { margin-top: 0; }
.threat-foot {
  margin-top: 20px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); letter-spacing: 0.02em;
  line-height: 1.6;
  max-width: 80ch;
}

.threat-disclosure {
  margin-top: 64px;
  padding: 28px 32px;
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--accent);
  border-radius: 4px;
}
.threat-disclosure p {
  font-size: 15px;
  color: var(--ink-secondary);
  line-height: 1.6;
  max-width: 75ch;
}
.threat-disclosure a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-subtle);
}
.threat-disclosure a:hover { border-bottom-color: var(--accent); }

/* ---- mobile fixes ---- */
.verifier pre, .code-block pre {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
@media (max-width: 600px) {
  .verifier pre, .code-block pre {
    font-size: 0.7rem;
    white-space: pre-wrap;
    word-break: break-word;
  }
}

@media (max-width: 768px) {
  .arch-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 8px;
  }
  .arch-scroll svg { min-width: 800px; }
  .arch-scroll::after {
    content: "← scroll →";
    display: block;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--ink-muted);
    padding-top: 8px;
  }
  .pipeline-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 8px;
  }
  .pipeline-scroll svg { min-width: 800px; }
  .pipeline-scroll::after {
    content: "← scroll →";
    display: block;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--ink-muted);
    padding-top: 8px;
  }
}

@media (max-width: 600px) {
  .hero-viz { width: 100%; }
  .viz-svg { width: 100%; height: auto; }
  .viz-svg text { font-size: 11px !important; }
  .viz-svg .v-tag { font-size: 9.5px !important; }
}

/* ---- verifier tampered state ---- */
.verifier pre.tampered .fail { color: #F87171; }
.verifier pre.tampered .err-summary { color: #F87171; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---- form success state ---- */
.form-success {
  text-align: center;
  padding: 32px 24px;
}
.form-success-mark {
  font-family: var(--font-mono);
  font-size: 32px;
  color: var(--ok);
  margin-bottom: 16px;
}
.form-success h3 {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 400;
  margin-bottom: 12px;
  color: var(--ink-primary);
}
.form-success p {
  color: var(--ink-secondary);
  max-width: 42ch;
  margin: 0 auto;
}
.form-success a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-subtle);
}