/* Trifrost marketing site — "Frost Noir with Aurora Signal"
   Design tokens per docs/marketing-site-plan.md §3.3 */

:root {
  --bg-base: #06080F;
  --bg-surface: #0C1018;
  --bg-elevated: #141A26;
  --border: #1F2937;
  --border-strong: #2A3648;
  --text-primary: #F2F5FA;
  --text-secondary: #9AA4B2;
  --text-muted: #5B6675;

  --signal: #2DE2FF;
  --signal-glow: rgba(45, 226, 255, 0.35);
  --signal-dim: rgba(45, 226, 255, 0.12);
  --ice: #8FB4FF;
  --violet: #B06AFF;
  --success: #3FE3A0;
  --warning: #FFB454;
  --danger: #FF5C6C;

  --aurora: linear-gradient(115deg, #2DE2FF 0%, #6A8BFF 35%, #B06AFF 70%, #FF6AC2 100%);
  --aurora-soft: linear-gradient(115deg, rgba(45,226,255,.14) 0%, rgba(106,139,255,.14) 35%, rgba(176,106,255,.14) 70%, rgba(255,106,194,.14) 100%);

  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', monospace;

  --maxw: 1200px;
  --radius: 12px;
  --radius-sm: 8px;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
}

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.625;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--signal-glow); }

/* ---------- Typography ---------- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.1; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 700; }
h2 { font-size: clamp(1.9rem, 4vw, 2.9rem); }
h3 { font-size: clamp(1.25rem, 2.4vw, 1.6rem); }
h4 { font-size: 1.05rem; letter-spacing: 0; }
p { color: var(--text-secondary); }
.lede { font-size: clamp(1.1rem, 2vw, 1.35rem); color: var(--text-secondary); max-width: 62ch; }
.mono { font-family: var(--font-mono); }
.eyebrow {
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--signal);
  display: inline-block; margin-bottom: 1rem;
}
.eyebrow::before { content: '// '; color: var(--text-muted); }

a { color: var(--signal); text-decoration: none; }
a:hover { text-decoration: underline; }
main a { text-underline-offset: 3px; }

/* ---------- Layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: clamp(64px, 9vw, 120px) 0; }
.section + .section { border-top: 1px solid var(--border); }
.section-head { max-width: 720px; margin-bottom: clamp(36px, 5vw, 64px); }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head .lede { margin-top: 1.1rem; }
.section-head.center .lede { margin-left: auto; margin-right: auto; }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 960px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ---------- Nav ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(6, 8, 15, 0.82); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 28px; height: 64px; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; color: var(--text-primary); letter-spacing: 0.02em; }
.nav-logo:hover { text-decoration: none; }
.nav-logo svg { display: block; }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; list-style: none; }
.nav-links > li > a, .nav-links > li > button {
  display: block; padding: 8px 14px; color: var(--text-secondary); font-size: 0.92rem; font-weight: 500;
  background: none; border: none; cursor: pointer; font-family: var(--font-body); border-radius: var(--radius-sm);
}
.nav-links > li > a:hover, .nav-links > li > button:hover { color: var(--text-primary); text-decoration: none; background: var(--bg-elevated); }
.nav-links a[aria-current="page"] { color: var(--signal); }

.nav-drop { position: relative; }
.nav-drop > button::after { content: '▾'; margin-left: 6px; font-size: 0.7em; color: var(--text-muted); }
.nav-drop .drop-menu {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 280px;
  background: var(--bg-surface); border: 1px solid var(--border-strong); border-radius: var(--radius);
  padding: 8px; list-style: none; opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
  box-shadow: 0 24px 48px rgba(0,0,0,.5);
}
.nav-drop:hover .drop-menu, .nav-drop:focus-within .drop-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.drop-menu a { display: block; padding: 10px 12px; border-radius: var(--radius-sm); color: var(--text-primary); font-size: 0.92rem; }
.drop-menu a:hover { background: var(--bg-elevated); text-decoration: none; }
.drop-menu a span { display: block; font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

.nav-cta { display: flex; align-items: center; gap: 10px; margin-left: 12px; }
.nav-toggle { display: none; background: none; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); color: var(--text-primary); padding: 8px 12px; cursor: pointer; font-size: 1rem; }

@media (max-width: 960px) {
  .nav-toggle { display: block; margin-left: auto; }
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch;
    background: var(--bg-surface); border-bottom: 1px solid var(--border); padding: 12px 24px 20px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links > li > a, .nav-links > li > button { padding: 12px 8px; width: 100%; text-align: left; }
  .nav-drop .drop-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; background: transparent; padding: 0 0 0 16px; }
  .nav-cta { margin: 12px 0 0; flex-direction: column; align-items: stretch; }
  .nav-cta .btn { text-align: center; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 24px;
  font-family: var(--font-display); font-weight: 600; font-size: 0.95rem;
  border-radius: var(--radius-sm); border: 1px solid transparent; cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-signal { background: var(--signal); color: #04121a; box-shadow: 0 0 24px var(--signal-glow); }
.btn-signal:hover { box-shadow: 0 0 36px var(--signal-glow); color: #04121a; }
.btn-ghost { background: transparent; color: var(--text-primary); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--signal); color: var(--signal); }
.btn-sm { padding: 8px 16px; font-size: 0.85rem; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: clamp(80px, 12vw, 160px) 0 clamp(64px, 8vw, 110px); overflow: hidden; }
.hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 60% 45% at 75% -5%, rgba(45,226,255,.13), transparent 60%),
    radial-gradient(ellipse 45% 40% at 15% 10%, rgba(176,106,255,.09), transparent 60%);
}
.hero-inner { position: relative; }
.hero h1 { max-width: 14ch; }
.hero .lede { margin: 1.5rem 0 2.25rem; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-badges { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 2.5rem; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
@media (max-width: 960px) { .hero-grid { grid-template-columns: 1fr; } }

/* ---------- Cards ---------- */
.card {
  background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.card h3 { margin-bottom: .6rem; }
.card p { font-size: .95rem; }
.card .card-icon { margin-bottom: 16px; }
.card-link { display: inline-block; margin-top: 14px; font-size: .9rem; font-weight: 600; }
.card-accent { border-top: 2px solid var(--signal); }
.card-hover:hover { border-color: var(--signal); box-shadow: 0 8px 32px rgba(45,226,255,.08); }

/* ---------- Stats ---------- */
.stat-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.stat { background: var(--bg-surface); padding: 28px 24px; text-align: center; }
.stat .num { font-family: var(--font-display); font-size: clamp(1.7rem, 3.4vw, 2.5rem); font-weight: 700; color: var(--signal); }
.stat .lbl { font-size: .82rem; color: var(--text-muted); margin-top: 6px; letter-spacing: .04em; }
@media (max-width: 800px) { .stat-band { grid-template-columns: repeat(2, 1fr); } }

/* ---------- Badges / chips ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px;
  font-family: var(--font-mono); font-size: .74rem; font-weight: 500;
  border: 1px solid var(--border-strong); border-radius: 100px; color: var(--text-secondary);
  background: var(--bg-surface); white-space: nowrap;
}
.badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 8px var(--signal); }
.badge.success .dot { background: var(--success); box-shadow: 0 0 8px var(--success); }
.badge.aurora { border: none; background: var(--aurora-soft); color: var(--text-primary); }
.chip-row { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- Code ---------- */
.codeblock {
  background: #080B12; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; font-family: var(--font-mono); font-size: .85rem;
}
.codeblock .code-head {
  display: flex; align-items: center; gap: 8px; padding: 10px 16px;
  border-bottom: 1px solid var(--border); color: var(--text-muted); font-size: .75rem; letter-spacing: .06em;
}
.codeblock .code-head .dots { display: flex; gap: 5px; }
.codeblock .code-head .dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--border-strong); display: block; }
.codeblock pre { padding: 18px 20px; overflow-x: auto; line-height: 1.7; }
.codeblock .c-k { color: var(--signal); }      /* keyword / command */
.codeblock .c-s { color: #9ECE6A; }            /* string */
.codeblock .c-c { color: var(--text-muted); }  /* comment */
.codeblock .c-n { color: var(--ice); }         /* number / const */
.codeblock .c-p { color: var(--violet); }      /* param */

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-surface); }
table.cmp { width: 100%; border-collapse: collapse; font-size: .92rem; min-width: 640px; }
.cmp th, .cmp td { padding: 13px 18px; text-align: left; border-bottom: 1px solid var(--border); }
.cmp thead th { font-family: var(--font-display); font-size: .82rem; letter-spacing: .08em; text-transform: uppercase; color: var(--text-muted); background: var(--bg-elevated); }
.cmp tbody tr:last-child td { border-bottom: none; }
.cmp tbody tr:hover { background: rgba(45,226,255,.03); }
.cmp td.yes { color: var(--success); font-weight: 600; }
.cmp td.no { color: var(--text-muted); }
.cmp td:first-child { color: var(--text-primary); font-weight: 500; }
.cmp .highlight-col { background: rgba(45,226,255,.05); }

/* ---------- Screenshots ---------- */
.shot {
  border: 1px solid var(--border-strong); border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 32px 80px rgba(0,0,0,.55), 0 0 0 1px rgba(45,226,255,.05);
  background: var(--bg-surface);
}
.shot img { display: block; width: 100%; height: auto; }
.shot figcaption { padding: 12px 18px; font-size: .82rem; color: var(--text-muted); border-top: 1px solid var(--border); font-family: var(--font-mono); }

/* ---------- Diagram panels ---------- */
.diagram-panel {
  background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: clamp(20px, 4vw, 44px); position: relative; overflow: hidden;
}
.diagram-panel .diagram-caption {
  margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--border);
  font-family: var(--font-mono); font-size: .85rem; color: var(--signal); min-height: 1.6em;
}
.diagram-legend { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 14px; font-size: .8rem; color: var(--text-muted); }
.diagram-legend span { display: inline-flex; align-items: center; gap: 7px; }
.diagram-legend i { width: 10px; height: 10px; border-radius: 50%; display: block; }

/* ---------- Callouts ---------- */
.callout {
  border: 1px solid var(--border); border-left: 3px solid var(--signal);
  background: var(--bg-surface); border-radius: var(--radius-sm); padding: 20px 24px;
}
.callout.warn { border-left-color: var(--warning); }
.callout h4 { margin-bottom: .4rem; }
.callout p { font-size: .92rem; }

/* ---------- Split feature rows ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.split.rev > .split-media { order: 2; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } .split.rev > .split-media { order: 0; } }
.split ul.tick { list-style: none; margin-top: 18px; }
.split ul.tick li { padding: 7px 0 7px 30px; position: relative; color: var(--text-secondary); font-size: .95rem; }
.split ul.tick li::before { content: '▸'; position: absolute; left: 4px; color: var(--signal); }
.split ul.tick li strong { color: var(--text-primary); }

/* ---------- CTA band ---------- */
.cta-band { position: relative; text-align: center; padding: clamp(64px, 9vw, 110px) 0; overflow: hidden; }
.cta-band::before { content: ''; position: absolute; inset: 0; background: var(--aurora-soft); opacity: .5; pointer-events: none; }
.cta-band::after { content: ''; position: absolute; left: 0; right: 0; top: 0; height: 1px; background: var(--aurora); }
.cta-band > .wrap { position: relative; }
.cta-band h2 { max-width: 20ch; margin: 0 auto 1.2rem; }
.cta-band .hero-ctas { justify-content: center; }

/* ---------- Roadmap honesty strip ---------- */
.roadmap-strip { border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-surface); padding: 26px 30px; display: flex; gap: 24px; align-items: flex-start; flex-wrap: wrap; }
.roadmap-strip .rs-col { flex: 1; min-width: 240px; }
.roadmap-strip h4 { font-family: var(--font-mono); font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; margin-bottom: 10px; }
.roadmap-strip .now h4 { color: var(--success); }
.roadmap-strip .next h4 { color: var(--ice); }
.roadmap-strip p, .roadmap-strip li { font-size: .88rem; color: var(--text-secondary); }

/* ---------- Forms ---------- */
.form-grid { display: grid; gap: 16px; max-width: 640px; }
.form-grid label { display: block; font-size: .82rem; font-weight: 600; margin-bottom: 6px; color: var(--text-secondary); letter-spacing: .03em; }
.form-grid input, .form-grid select, .form-grid textarea {
  width: 100%; background: var(--bg-surface); border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  color: var(--text-primary); padding: 12px 14px; font-family: var(--font-body); font-size: .95rem;
}
.form-grid input:focus, .form-grid select:focus, .form-grid textarea:focus { outline: none; border-color: var(--signal); box-shadow: 0 0 0 3px var(--signal-dim); }
.form-grid textarea { min-height: 140px; resize: vertical; }
.form-note { font-size: .82rem; color: var(--text-muted); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: #04060B; padding: 64px 0 32px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(4, 1fr); gap: 32px; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
.footer-brand p { font-size: .88rem; margin-top: 14px; max-width: 30ch; }
.footer-col h4 { font-family: var(--font-mono); font-size: .74rem; letter-spacing: .16em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 14px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 9px; }
.footer-col a { color: var(--text-secondary); font-size: .9rem; }
.footer-col a:hover { color: var(--signal); text-decoration: none; }
.footer-bottom { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border); font-size: .82rem; color: var(--text-muted); }
.footer-bottom .spacer { flex: 1; }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .5s ease, transform .5s cubic-bezier(.22,.68,0,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }

/* ---------- Failover diagram ---------- */
#failover-diagram { width: 100%; height: auto; display: block; }
#failover-diagram text { font-family: var(--font-mono); fill: var(--text-secondary); }
#failover-diagram .node-label { font-family: var(--font-display); font-weight: 600; fill: var(--text-primary); }
#failover-diagram .fo-box, #failover-diagram .fo-edge { transition: stroke .4s ease, opacity .4s ease; }
#failover-diagram .fo-down .fo-box { stroke: var(--danger); }
#failover-diagram .fo-down { opacity: .55; }
#failover-diagram .fo-probe .fo-box { stroke: var(--warning); }
#failover-diagram .fo-edge-down { stroke: var(--danger); opacity: .35; }
.failover-static { display: none; }
@media (prefers-reduced-motion: reduce) {
  #failover-diagram, #governance-diagram, .failover-live-ui, .diagram-caption, .diagram-legend { display: none; }
  .failover-static { display: grid; gap: 20px; }
}

/* ---------- Governance diagram ---------- */
#governance-diagram { width: 100%; height: auto; display: block; }
#governance-diagram text { font-family: var(--font-mono); fill: var(--text-secondary); }
#governance-diagram .node-label { font-family: var(--font-display); font-weight: 600; fill: var(--text-primary); }
#governance-diagram .gv-box { transition: stroke .3s ease; }
#gv-gateway-box { transition: stroke .18s ease, stroke-width .18s ease; }

/* ---------- Directives widget ---------- */
.directives-widget { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
@media (max-width: 860px) { .directives-widget { grid-template-columns: 1fr; } }
.dw-list { display: grid; gap: 10px; }
.dw-row { display: grid; grid-template-columns: 1fr auto auto auto; gap: 10px; align-items: center; background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 16px; }
.dw-row .pname { font-family: var(--font-mono); font-size: .88rem; color: var(--text-primary); }
.dw-row .pslug { font-size: .72rem; color: var(--text-muted); display: block; }
.dw-toggle { display: flex; flex-direction: column; align-items: center; gap: 3px; font-size: .68rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; }
.dw-toggle input { accent-color: var(--signal); width: 17px; height: 17px; cursor: pointer; }
.dw-output .codeblock { height: 100%; }
.dw-result { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; min-height: 34px; }
.dw-result .badge { font-size: .8rem; padding: 7px 14px; }
.dw-error { color: var(--danger); font-family: var(--font-mono); font-size: .85rem; }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; } .mt-4 { margin-top: 32px; } .mt-5 { margin-top: 48px; }
.mb-2 { margin-bottom: 16px; } .mb-3 { margin-bottom: 24px; } .mb-4 { margin-bottom: 32px; }
.muted { color: var(--text-muted); }
.small { font-size: .85rem; }
.maxw-60 { max-width: 60ch; }
.maxw-70 { max-width: 70ch; }
.flex { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.region-list { display: flex; gap: 10px; flex-wrap: wrap; }
hr.sep { border: none; border-top: 1px solid var(--border); margin: 40px 0; }