/* ============================================================
   Aitia Code — product microsite  (v2: Lume blue system)
   Palette: Lume Systems electric blue on cool white / deep-space navy.
   Accent semantics: blue = the product's mechanisms, interactive accent
                     gold  = the illumination point (used once: the merge node)
   ============================================================ */

:root {
  --bg: #FBFCFE;
  --surface: #F3F6FB;
  --surface-2: #E9EFF7;
  --ink: #0F1D33;
  --ink-soft: #4B5A70;
  --ink-faint: #7B879A;
  --line: #DCE2EC;
  --line-strong: #C7D0DE;

  --accent: #0078E8;
  --accent-strong: #005FBF;
  --accent-soft: #E6F2FD;
  --accent-glow: rgba(0, 120, 232, 0.16);
  --cyan: #16B8F3;
  --gold: #FFAA2B;
  --gold-soft: rgba(255, 170, 43, 0.35);
  --loden: #1F7A2B;
  --oxblood: #7A1F2B;

  --navy: #041A2E;
  --navy-2: #06213A;
  --on-navy: #F7FBFF;
  --on-navy-soft: #B9C6D6;

  --sans: 'Geist', 'Geist Fallback', -apple-system, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --mono: 'Geist Mono', 'Geist Mono Fallback', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --nav-h: 56px;
  --wrap: 1180px;
  --gutter: clamp(20px, 5vw, 64px);
  --measure: 64ch;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 1px 2px rgba(15, 29, 51, 0.04), 0 16px 40px -20px rgba(0, 120, 232, 0.25);

  --t-fast: 160ms;
  --t-med: 320ms;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #041A2E;
    --surface: #06213A;
    --surface-2: #0B2A47;
    --ink: #E5EAF4;
    --ink-soft: #AEB9CB;
    --ink-faint: #7F8CA1;
    --line: #17304C;
    --line-strong: #234466;
    --accent: #16B8F3;
    --accent-strong: #4ACBF5;
    --accent-soft: rgba(22, 184, 243, 0.12);
    --accent-glow: rgba(22, 184, 243, 0.2);
    --navy: #020F1E;
    --navy-2: #031426;
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 16px 40px -20px rgba(22, 184, 243, 0.25);
    --loden: #3FBF5C;
    --oxblood: #E8636F;
  }
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.6;
  font-feature-settings: "kern", "liga", "calt", "ss01";
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--sans); font-weight: 600; margin: 0; line-height: 1.1; letter-spacing: -0.025em; text-wrap: balance; }
p { margin: 0 0 1.1em; }
a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.18em; text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); transition: color var(--t-fast) var(--ease), text-decoration-color var(--t-fast) var(--ease); }
a:hover { color: var(--accent-strong); text-decoration-color: currentColor; }
em { font-style: italic; }
strong { font-weight: 600; }
code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.08em 0.45em;
  white-space: nowrap;
}
.mono { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 500; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--accent); color: #fff; }

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }

.skip {
  position: absolute; left: 12px; top: -60px; z-index: 100;
  background: var(--ink); color: var(--bg); padding: 10px 14px; border-radius: var(--radius-sm);
  font-family: var(--mono); font-size: 0.8rem; text-decoration: none;
}
.skip:focus { top: 12px; }

/* ---------- Brand lockup (HTML, so it uses the web font) ---------- */
.brand { display: inline-flex; align-items: center; gap: 0.32em; text-decoration: none; color: var(--ink); font-weight: 600; letter-spacing: -0.03em; font-size: 1.32rem; line-height: 1; }
.brand:hover { color: var(--ink); }
.brand .bridge { width: 0.62em; height: 0.9em; display: block; flex: none; }
.brand .bridge .plus { fill: var(--loden); }
.brand .bridge .minus { fill: var(--oxblood); }
.brand-sm { font-size: 1.05rem; }
.brand:not(a) { cursor: default; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  -webkit-backdrop-filter: blur(12px) saturate(140%); backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter);
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav-menu { display: flex; align-items: center; gap: 2px; }
.nav-menu a {
  font-size: 0.9rem; font-weight: 500;
  color: var(--ink-soft); text-decoration: none;
  padding: 8px 12px; border-radius: var(--radius-sm);
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.nav-menu a:hover { color: var(--ink); background: var(--surface); }
.nav-menu a[aria-current="true"] { color: var(--accent); }
.btn-nav { margin-left: 10px; }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--line-strong); border-radius: var(--radius-sm);
  width: 42px; height: 38px; padding: 0; cursor: pointer; position: relative;
}
.nav-toggle span {
  position: absolute; left: 11px; right: 11px; height: 1.5px; background: var(--ink); border-radius: 2px;
  transition: transform var(--t-med) var(--ease), top var(--t-med) var(--ease);
}
.nav-toggle span:first-child { top: 13px; }
.nav-toggle span:last-child { top: 22px; }
.nav-toggle[aria-expanded="true"] span:first-child { top: 17.5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { top: 17.5px; transform: rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--sans); font-weight: 500; font-size: 0.95rem; line-height: 1;
  padding: 13px 20px; border-radius: var(--radius-sm); text-decoration: none;
  border: 1px solid transparent; white-space: nowrap;
  transition: background-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: #fff; }
.btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--line-strong); }
.btn-secondary:hover { border-color: var(--ink-faint); color: var(--ink); background: var(--surface-2); }
.nav-menu .btn { padding: 9px 14px; font-size: 0.86rem; color: #fff; }
.nav-menu .btn:hover { background: var(--accent-strong); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: clamp(20px, 3vh, 36px) 0 clamp(36px, 6vh, 64px); }
.hero-top { position: relative; z-index: 1; display: flex; align-items: center; gap: 22px; margin-bottom: 14px; }
.hero-side { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; }
.brand-hero { font-size: 2.97rem; }
.hero-glow { position: absolute; right: -10%; top: -20%; width: 720px; height: 720px; border-radius: 50%; background: radial-gradient(closest-side, var(--accent-glow), transparent 70%); pointer-events: none; z-index: 0; }
.hero .wrap { position: relative; z-index: 1; }
.hero-grid {
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(32px, 6vw, 96px); align-items: end;
}
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.8rem; font-weight: 500; color: var(--ink-soft);
  border: 1px solid var(--line-strong); border-radius: 999px; padding: 6px 12px 6px 8px;
  text-decoration: none; background: color-mix(in srgb, var(--surface) 70%, transparent);
  margin-bottom: 0; flex: none; transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.pill:hover { color: var(--ink); border-color: var(--accent); }
.pill .pill-arc { width: 22px; height: 12px; display: block; }
.pill .pill-arrow { color: var(--accent); }
.eyebrow {
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; font-weight: 500;
  color: var(--accent); margin: 0 0 12px;
}
.eyebrow .sep { color: var(--ink-faint); margin-inline: 8px; }
.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.9rem);
  line-height: 1.02; letter-spacing: -0.04em; font-weight: 600;
  margin-bottom: 22px;
}
.lede {
  font-size: clamp(1.08rem, 1.5vw, 1.28rem); line-height: 1.55;
  color: var(--ink-soft); max-width: 36em; margin-bottom: 32px;
}
.lede em { color: var(--ink); font-style: normal; font-weight: 600; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* Provenance trail — the product, drawn */
.trail {
  margin: 0; border: 1px solid var(--line); border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg) 92%, transparent); padding: 22px 24px 10px;
  box-shadow: var(--shadow-card);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.trail-caption { font-size: 0.84rem; color: var(--ink-faint); margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.trail-caption .mono { color: var(--accent); }
.trail-list { list-style: none; margin: 0; padding: 0 0 0 22px; position: relative; }
.trail-list::before {
  content: ""; position: absolute; left: 4px; top: 12px; bottom: 26px; width: 1.5px;
  background: linear-gradient(to bottom, var(--accent), var(--cyan) 70%, var(--gold));
}
.trail-list li {
  position: relative; display: grid; grid-template-columns: 100px 1fr; gap: 14px; align-items: baseline;
  padding: 7px 0;
}
.trail-list li::before {
  content: ""; position: absolute; left: -22px; top: 14px; width: 9px; height: 9px; border-radius: 50%;
  background: var(--bg); border: 1.5px solid var(--accent);
}
.trail-list li:last-child::before { background: var(--gold); border-color: var(--gold); box-shadow: 0 0 0 4px var(--gold-soft); }
.trail-key { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); font-weight: 500; }
.trail-list li:last-child .trail-key { color: var(--ink); }
.trail-val { font-size: 0.92rem; color: var(--ink-soft); line-height: 1.4; }

/* Page-load reveal */
.reveal { opacity: 0; transform: translateY(10px); animation: reveal 640ms var(--ease) forwards; animation-delay: calc(var(--i, 0) * 90ms); }
@keyframes reveal { to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .reveal { animation: none; opacity: 1; transform: none; } }

/* ---------- Questions band ---------- */
.band { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); }
.questions { padding: clamp(40px, 6vh, 72px) 0; }
.two-col { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.h-label { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; font-weight: 500; color: var(--ink-faint); margin: 6px 0 16px; }
.qlist { list-style: none; margin: 0; padding: 0; }
.qlist li {
  font-size: clamp(1.02rem, 1.4vw, 1.2rem); line-height: 1.4; font-weight: 500; letter-spacing: -0.01em;
  padding: 13px 0 13px 28px; border-top: 1px solid var(--line); position: relative;
}
.qlist li:last-child { border-bottom: 1px solid var(--line); }
.qlist li::before { content: "?"; position: absolute; left: 0; top: 13px; font-family: var(--mono); font-size: 0.85rem; color: var(--accent); background: var(--accent-soft); width: 18px; height: 18px; border-radius: 5px; display: grid; place-items: center; line-height: 1; margin-top: 3px; }

/* ---------- Prose ---------- */
.prose { max-width: var(--measure); }
.prose .lead { font-size: 1.14rem; line-height: 1.5; color: var(--ink); font-weight: 500; letter-spacing: -0.01em; }
.prose p:last-child { margin-bottom: 0; }

/* ---------- Pillars ---------- */
.pillars { padding: clamp(48px, 8vh, 96px) 0 clamp(24px, 4vh, 48px); }
.pillar-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.pillar { padding: 26px 26px 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); position: relative; overflow: hidden; transition: border-color var(--t-med) var(--ease), transform var(--t-med) var(--ease); }
.pillar::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 3px; background: linear-gradient(90deg, var(--accent), var(--cyan)); opacity: 0; transition: opacity var(--t-med) var(--ease); }
.pillar:hover { border-color: var(--accent); transform: translateY(-2px); }
.pillar:hover::before { opacity: 1; }
.pillar-num { display: inline-block; color: var(--accent); background: var(--accent-soft); padding: 4px 8px; border-radius: 6px; margin-bottom: 18px; }
.pillar h3 { font-size: 1.32rem; margin-bottom: 10px; }
.pillar p { margin: 0; color: var(--ink-soft); font-size: 0.96rem; }

/* ---------- Sections ---------- */
.section { padding: clamp(56px, 9vh, 112px) 0; border-top: 1px solid var(--line); scroll-margin-top: calc(var(--nav-h) + 8px); }
.section.alt { background: var(--surface); }
.section-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: clamp(28px, 5vw, 80px); align-items: start; }
.section-head { position: sticky; top: calc(var(--nav-h) + 32px); }
.section-num { display: inline-block; color: var(--accent); background: var(--accent-soft); padding: 4px 8px; border-radius: 6px; margin-bottom: 16px; }
.section-head h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
.section-note { margin: 16px 0 0; color: var(--ink-soft); font-size: 0.95rem; max-width: 28em; }
.section-note em { color: var(--ink); font-style: normal; font-weight: 500; }
.section-body > * + * { margin-top: 36px; }

/* ---------- Ledger (diff of failure classes) ---------- */
.ledger-legend { display: flex; gap: 22px; color: var(--ink-faint); padding-bottom: 12px; border-bottom: 1px solid var(--line); margin-top: 28px; }
.ledger-legend b { font-weight: 600; margin-right: 6px; }
.lg-minus b { color: var(--ink-faint); }
.lg-plus b { color: var(--accent); }
.ledger { list-style: none; margin: 0; padding: 0; }
.hunk { padding: 26px 0; border-bottom: 1px solid var(--line); }
.hunk h3 { font-size: 1.22rem; margin-bottom: 14px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 12px; }
.hunk-idx { color: var(--accent); font-size: 0.72rem; background: var(--accent-soft); padding: 3px 7px; border-radius: 6px; }
.tag { font-size: 0.64rem; color: var(--ink-faint); border: 1px solid var(--line-strong); border-radius: 999px; padding: 3px 9px; letter-spacing: 0.06em; }
.hunk p { position: relative; padding: 11px 16px 11px 38px; margin: 0; font-size: 0.96rem; line-height: 1.55; border-radius: var(--radius-sm); }
.hunk .sign { position: absolute; left: 14px; top: 10px; font-family: var(--mono); font-weight: 600; font-size: 1rem; }
.hunk .minus { color: var(--ink-soft); background: var(--surface-2); border-left: 3px solid var(--line-strong); }
.hunk .minus .sign { color: var(--ink-faint); }
.hunk .plus { color: var(--ink); background: var(--accent-soft); border-left: 3px solid var(--accent); margin-top: 6px; }
.hunk .plus .sign { color: var(--accent); }
.section.alt .hunk .minus { background: var(--bg); }
.fn { font-family: var(--mono); font-size: 0.66em; vertical-align: super; line-height: 0; text-decoration: none; margin-left: 3px; color: var(--accent); }
.fn + .fn { margin-left: 2px; }

/* ---------- Mechanisms (How it works) ---------- */
.mech { margin: 0; }
.mech-row { display: grid; grid-template-columns: 132px 1fr; gap: 18px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.mech-row:first-child { border-top: 1px solid var(--line); }
.mech dt { color: var(--accent); padding-top: 4px; }
.mech dd { margin: 0; color: var(--ink); max-width: var(--measure); }

/* ---------- Stats (The shape) ---------- */
.stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.stat { padding: 24px 24px 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); }
.section.alt .stat { background: var(--bg); }
.stat h3 { color: var(--ink-faint); margin-bottom: 14px; }
.stat-num { font-size: clamp(2.2rem, 3.6vw, 3.2rem); line-height: 1; letter-spacing: -0.04em; font-weight: 600; color: var(--accent); margin: 0 0 8px; display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; font-variant-numeric: tabular-nums; }
.stat-unit { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); font-weight: 500; }
.stat-sub { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint); margin: 0 0 12px; letter-spacing: 0.02em; }
.stat-desc { margin: 0; font-size: 0.94rem; color: var(--ink-soft); }

.callout { border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; max-width: var(--measure); background: var(--surface); position: relative; }
.callout::before { content: ""; position: absolute; left: 0; top: 18px; bottom: 18px; width: 3px; border-radius: 3px; background: linear-gradient(to bottom, var(--accent), var(--cyan)); }
.callout-label { display: block; color: var(--accent); margin-bottom: 10px; }
.callout p { margin: 0; }

/* ---------- Steps (Rollout) ---------- */
.steps { list-style: none; margin: 0; padding: 0; }
.step { display: grid; grid-template-columns: 56px 1fr; gap: 20px; padding: 24px 0; border-top: 1px solid var(--line); }
.step:last-child { border-bottom: 1px solid var(--line); }
.step-num { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; font-family: var(--mono); font-weight: 600; font-size: 0.95rem; color: var(--accent); background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }
.step h3 { font-size: 1.28rem; margin-bottom: 10px; display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: baseline; }
.step-role { color: var(--ink-faint); font-size: 0.68rem; }
.step p { margin: 0; color: var(--ink-soft); max-width: var(--measure); }

/* ---------- Audit checklist ---------- */
.checks { list-style: none; margin: 0 0 1.1em; padding: 0; }
.checks li { position: relative; padding: 11px 0 11px 30px; border-top: 1px solid var(--line); }
.checks li:last-child { border-bottom: 1px solid var(--line); }
.checks li::before { content: ""; position: absolute; left: 2px; top: 17px; width: 14px; height: 14px; border-radius: 4px; background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); }
.checks li::after { content: ""; position: absolute; left: 6px; top: 20px; width: 6px; height: 3px; border-left: 1.5px solid var(--accent); border-bottom: 1.5px solid var(--accent); transform: rotate(-45deg); }

/* ---------- Candor ---------- */
.candor { border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 28px; max-width: calc(var(--measure) + 4ch); background: var(--bg); border-top: 3px solid var(--ink); }
.candor p { color: var(--ink-soft); }
.candor p strong { color: var(--ink); font-weight: 600; }
.candor p:last-child { margin-bottom: 0; }

/* ---------- Terms ---------- */
.terms { margin: 0; }
.term { padding: 22px 0; border-top: 1px solid var(--line); }
.term:last-child { border-bottom: 1px solid var(--line); }
.term dt { font-size: 1.15rem; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 8px; }
.term dd { margin: 0; color: var(--ink-soft); max-width: var(--measure); }

/* ---------- Start ---------- */
.start-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.start-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; display: flex; flex-direction: column; gap: 10px; background: var(--surface); }
.start-card h3 { font-size: 1.3rem; }
.start-card p { margin: 0; color: var(--ink-soft); }
.start-card .btn { align-self: flex-start; margin-top: 14px; }
.start-email { margin: 10px 0 0; font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.04em; }
.start-card.emphasis .start-email a { color: var(--on-navy-soft); text-decoration-color: color-mix(in srgb, var(--on-navy-soft) 40%, transparent); }
.start-card.emphasis .start-email a:hover { color: var(--on-navy); }
.start-card.emphasis { background: var(--navy); color: var(--on-navy); border-color: var(--navy); position: relative; overflow: hidden; }
.start-card.emphasis::after { content: ""; position: absolute; right: -80px; top: -80px; width: 260px; height: 260px; border-radius: 50%; background: radial-gradient(closest-side, rgba(22, 184, 243, 0.35), transparent 70%); pointer-events: none; }
.start-card.emphasis h3 { color: var(--on-navy); }
.start-card.emphasis p { color: var(--on-navy-soft); }
.start-card.emphasis .btn-primary { background: var(--cyan); border-color: var(--cyan); color: var(--navy); position: relative; z-index: 1; }
.start-card.emphasis .btn-primary:hover { background: #4ACBF5; border-color: #4ACBF5; color: var(--navy); }
@media (prefers-color-scheme: dark) {
  .start-card.emphasis { background: var(--surface-2); border-color: var(--line-strong); }
}

/* ---------- Sources ---------- */
.sources { padding-top: clamp(40px, 6vh, 64px); padding-bottom: clamp(40px, 6vh, 64px); }
.sources .section-head h2 { font-size: 1.6rem; }
.srcs { margin: 0; padding-left: 1.6em; font-size: 0.9rem; color: var(--ink-soft); columns: 2; column-gap: 40px; }
.srcs li { margin-bottom: 8px; break-inside: avoid; scroll-margin-top: calc(var(--nav-h) + 16px); }
.srcs li:target { color: var(--ink); }
.src-note { font-size: 0.88rem; color: var(--ink-faint); max-width: var(--measure); margin-top: 24px; margin-bottom: 0; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); background: var(--surface); padding: 44px 0 48px; }
.footer-grid { display: grid; grid-template-columns: auto 1fr auto; gap: 36px; align-items: start; }
.footer-brand { display: flex; flex-direction: column; gap: 14px; }
.footer-by { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-faint); }
.lume-link { display: inline-block; line-height: 0; border-radius: var(--radius-sm); }
.lume-link img { width: 176px; height: auto; display: block; }
.footer-meta { font-size: 0.86rem; color: var(--ink-faint); max-width: 60ch; padding-top: 4px; }
.footer-meta p { margin: 0 0 6px; }
.footer-meta .mono { font-size: 0.66rem; letter-spacing: 0.06em; text-transform: none; }
.footer-links { display: flex; flex-direction: column; gap: 8px; font-size: 0.9rem; text-align: right; padding-top: 4px; }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; align-items: start; }
  .trail { max-width: 560px; }
  .section-grid { grid-template-columns: 1fr; gap: 24px; }
  .section-head { position: static; }
  .section-note { max-width: var(--measure); }
}
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .hero-top { margin-bottom: 24px; }
  .nav-menu {
    position: absolute; left: 0; right: 0; top: var(--nav-h);
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 8px var(--gutter) 16px;
    display: none;
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 12px 4px; font-size: 1rem; border-bottom: 1px solid var(--line); border-radius: 0; }
  .nav-menu a:hover { background: transparent; }
  .nav-menu .btn-nav { margin: 14px 0 0; border-bottom: 0; justify-content: center; border-radius: var(--radius-sm); }
  .two-col { grid-template-columns: 1fr; }
  .pillar-grid { grid-template-columns: 1fr; }
  .start-grid { grid-template-columns: 1fr; }
  .srcs { columns: 1; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-links { flex-direction: row; text-align: left; gap: 20px; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .hero { padding-top: 16px; }
  .hero h1 { font-size: clamp(2.2rem, 10vw, 3rem); }
  .cta-row .btn { width: 100%; }
  .trail { padding: 18px 16px 8px; }
  .trail-list li { grid-template-columns: 1fr; gap: 2px; }
  .mech-row { grid-template-columns: 1fr; gap: 6px; }
  .stats { grid-template-columns: 1fr; }
  .step { grid-template-columns: 48px 1fr; gap: 14px; }
  .hunk h3 { font-size: 1.12rem; }
  .hunk p { padding-left: 34px; }
  .candor { padding: 20px 18px; }
}