/* ViaductCDN — self-hosted type, dark-first neutral-warm */

:root {
  /* Palette — warm neutral, low chroma */
  --bg: #0e0d0c;
  --bg-1: #161413;
  --bg-2: #1d1a18;
  --line: #2a2624;
  --line-2: #3a3532;
  --fg: #ece8e3;
  --fg-1: #b8b1a8;
  --fg-2: #7a736b;
  --fg-3: #504a44;

  /* Accent — low-chroma violet (Tor-ish without being literal) */
  --accent: oklch(0.72 0.08 300);
  --accent-2: oklch(0.55 0.09 300);
  --accent-bg: oklch(0.25 0.04 300 / 0.35);

  /* BTC orange — used sparingly as a second accent */
  --btc: oklch(0.75 0.12 60);

  /* Type */
  --sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', 'Menlo', 'Consolas', monospace;

  --radius: 4px;
  --radius-lg: 8px;

  --maxw: 1160px;
  --pad: clamp(20px, 4vw, 40px);
}

[data-theme="light"] {
  --bg: #f7f5f1;
  --bg-1: #efece6;
  --bg-2: #e7e3db;
  --line: #d9d4cb;
  --line-2: #c5bfb3;
  --fg: #1a1816;
  --fg-1: #474239;
  --fg-2: #6e6760;
  --fg-3: #948d84;
  --accent: oklch(0.45 0.1 300);
  --accent-2: oklch(0.55 0.1 300);
  --accent-bg: oklch(0.88 0.04 300 / 0.6);
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'ss01', 'cv11';
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

::selection { background: var(--accent-bg); color: var(--fg); }

/* Layout */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.section {
  padding-top: clamp(64px, 9vw, 120px);
  padding-bottom: clamp(64px, 9vw, 120px);
  border-top: 1px solid var(--line);
}

.section-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-2);
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
}

h1, h2, h3, h4 {
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

h1 { font-size: clamp(40px, 6.5vw, 72px); line-height: 1.02; letter-spacing: -0.03em; }
h2 { font-size: clamp(30px, 3.8vw, 44px); line-height: 1.08; }
h3 { font-size: 18px; line-height: 1.3; }

p { margin: 0; text-wrap: pretty; }

.mono { font-family: var(--mono); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 16px;
  border-radius: var(--radius);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  background: transparent;
  color: var(--fg);
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.btn-primary:hover { background: var(--fg-1); border-color: var(--fg-1); }
.btn-ghost {
  border-color: var(--line-2);
  color: var(--fg);
}
.btn-ghost:hover { border-color: var(--fg-2); background: var(--bg-1); }
.btn-sm { height: 32px; padding: 0 12px; font-size: 13px; }
.btn-lg { height: 44px; padding: 0 20px; font-size: 15px; }

.btn .arrow {
  transition: transform 150ms ease;
}
.btn:hover .arrow { transform: translateX(2px); }

/* Code / kbd */
code, kbd {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 1px 6px;
  color: var(--fg-1);
}

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

/* Scrollbar — subtle */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 10px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--fg-3); }

/* Prototype meta layout */
body.has-mobile-preview {
  display: grid;
  grid-template-columns: 1fr 420px;
  min-height: 100vh;
}

.site-col { min-width: 0; }

/* When mobile-preview is off, just one column */
body:not(.has-mobile-preview) .mobile-rail { display: none; }

.mobile-rail {
  position: sticky;
  top: 0;
  height: 100vh;
  background: #0a0909;
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 16px;
  overflow: hidden;
}

@media (max-width: 1100px) {
  body.has-mobile-preview {
    grid-template-columns: 1fr;
  }
  .mobile-rail { display: none !important; }
}