/* ════════════════════════════════════════════
   VCPL × Claude — Design System (Beige + Serif + Orange)
   ════════════════════════════════════════════ */

:root {
  color-scheme: light;

  /* Surfaces — warm beige Anthropic palette */
  --paper:       #F5F1EB;   /* page background */
  --paper-2:     #EFE9DF;   /* alt section */
  --paper-3:     #E8E0D2;   /* divider/strip */
  --card:        #FAF7F1;   /* card */
  --card-elev:   #FFFFFF;   /* elevated */
  --code-bg:     #2B2620;   /* dark code surface */
  --code-bg-2:   #3A332B;
  --code-ink:    #F1E8D6;

  /* Ink */
  --ink:         #1F1B16;
  --ink-soft:    #3A332B;
  --ink-mute:    #6B6157;
  --ink-faint:   #8E8478;

  /* Rules */
  --rule:        #D8CFBE;
  --rule-soft:   #E5DCCB;
  --rule-strong: #B7AB94;

  /* Brand — Anthropic clay-orange */
  --accent:      #C96442;
  --accent-ink:  #B85535;
  --accent-deep: #8B3E25;
  --accent-soft: rgba(201, 100, 66, 0.14);
  --accent-tint: rgba(201, 100, 66, 0.08);
  --accent-fg:   #FFFFFF;

  /* Secondary */
  --teal:        #5C8C7B;
  --teal-soft:   rgba(92, 140, 123, 0.16);
  --gold:        #B89F3F;
  --gold-soft:   rgba(184, 159, 63, 0.18);

  --shadow-1:    0 1px 0 rgba(31,27,22,0.04), 0 1px 2px rgba(31,27,22,0.06);
  --shadow-2:    0 1px 0 rgba(31,27,22,0.04), 0 8px 24px -10px rgba(31,27,22,0.18);
  --shadow-3:    0 24px 60px -24px rgba(31,27,22,0.28);

  --radius-sm:   6px;
  --radius:      10px;
  --radius-lg:   14px;
  --radius-xl:   20px;

  --hit-mobile:  44px;
  --hit-desk:    36px;

  --focus-ring:  0 0 0 3px rgba(201,100,66,0.32);

  --f-serif: "Source Serif 4", "Source Serif Pro",
             ui-serif, "Iowan Old Style", "Apple Garamond", "Times New Roman",
             "AppleSDGothicNeo", serif;
  --f-body:  "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
             system-ui, "Segoe UI", "Apple SD Gothic Neo", sans-serif;
  --f-mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

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

html {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: -0.005em;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 100% -200px, rgba(201,100,66,0.10), transparent 60%),
    radial-gradient(900px 500px at -10% 0%, rgba(184,159,63,0.08), transparent 60%),
    var(--paper);
}

/* — Typography — */
.serif { font-family: var(--f-serif); font-weight: 400; letter-spacing: -0.01em; }
.mono  { font-family: var(--f-mono); }

h1, h2, h3, h4 { font-family: var(--f-serif); font-weight: 400; letter-spacing: -0.015em; line-height: 1.15; margin: 0; color: var(--ink); }
h1 { font-size: clamp(40px, 6vw, 72px); }
h2 { font-size: clamp(28px, 3.4vw, 40px); }
h3 { font-size: 22px; }
h4 { font-size: 18px; }

p { margin: 0 0 0.8em; color: var(--ink-soft); }

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

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

/* — Focus-visible (keyboard-only) — */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}
button:focus-visible, a:focus-visible, [tabindex]:focus-visible {
  outline-offset: 3px;
}
/* Don't render outline on the programmatic <main tabindex="-1"> jump target */
main:focus-visible { outline: none; }

/* — Skip-to-content link (WCAG 2.4.1) — */
.skip-link {
  position: fixed;
  top: -100px; left: 16px;
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 18px;
  border-radius: var(--radius);
  font-family: var(--f-body); font-size: 14px; font-weight: 500;
  text-decoration: none;
  box-shadow: var(--shadow-2);
}
.skip-link:focus,
.skip-link:focus-visible {
  top: 12px;
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  text-decoration: none;
}

/* — Topbar — */
.topbar {
  position: sticky; top: 0; z-index: 30;
  background: rgba(245, 241, 235, 0.86);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--rule-soft);
}
.topbar-inner {
  max-width: 1240px; margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; gap: 24px;
}
.brand {
  display: inline-flex; align-items: baseline; gap: 10px;
  font-family: var(--f-serif); font-size: 22px;
  color: var(--ink); text-decoration: none;
}
.brand .mark {
  width: 22px; height: 22px;
  display: inline-block; vertical-align: -3px;
  background: var(--accent);
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M5 19 12 4l7 15-7-4-7 4z' fill='black'/></svg>") center/contain no-repeat;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M5 19 12 4l7 15-7-4-7 4z' fill='black'/></svg>") center/contain no-repeat;
}
.brand .tag {
  font-family: var(--f-body); font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 0.04em; text-transform: uppercase;
}
.nav { display: flex; gap: 4px; margin-left: auto; align-items: center; flex-wrap: wrap; }
.nav a {
  font-family: var(--f-body); font-size: 14.5px;
  color: var(--ink-soft);
  padding: 8px 14px; border-radius: 999px;
  transition: background 0.15s, color 0.15s;
}
.nav a:hover { background: var(--paper-3); color: var(--ink); text-decoration: none; }
.nav a.active { color: var(--ink); background: var(--paper-3); }
.nav a.cta {
  background: var(--ink); color: var(--paper);
  padding: 9px 16px;
}
.nav a.cta:hover { background: var(--accent); color: var(--accent-fg); }

/* — Containers — */
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 920px; margin: 0 auto; padding: 0 24px; }

/* — Buttons — */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 44px; padding: 0 22px;
  border-radius: 999px;
  font-family: var(--f-body); font-size: 15px; font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer; user-select: none;
  text-decoration: none;
  transition: transform 0.06s, background 0.15s, border-color 0.15s, color 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { background: var(--accent-ink); color: var(--accent-fg); text-decoration: none; }
.btn-dark { background: var(--ink); color: var(--paper); }
.btn-dark:hover { background: #000; color: var(--paper); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--rule-strong); }
.btn-ghost:hover { background: var(--card); text-decoration: none; }
.btn-sm { height: 36px; padding: 0 14px; font-size: 13.5px; }

/* — Pills / chips — */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  height: 28px; padding: 0 12px;
  border-radius: 999px;
  font-size: 12.5px; font-weight: 500; letter-spacing: 0.01em;
  background: var(--paper-3); color: var(--ink-soft);
  border: 1px solid var(--rule-soft);
}
.pill-accent { background: var(--accent-soft); color: var(--accent-deep); border-color: rgba(201,100,66,0.2); }
.pill-teal   { background: var(--teal-soft); color: #355749; border-color: rgba(92,140,123,0.25); }
.pill-gold   { background: var(--gold-soft); color: #6E5E1F; border-color: rgba(184,159,63,0.3); }

/* — Cards — */
.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--rule-strong); box-shadow: var(--shadow-2); }
.card-elev { background: var(--card-elev); box-shadow: var(--shadow-1); }

/* — Code block — */
.codeblock {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--radius-lg);
  font-family: var(--f-mono); font-size: 13px; line-height: 1.7;
  padding: 18px 20px;
  overflow: auto;
}
.codeblock .tok-c { color: #9CA39A; font-style: italic; }
.codeblock .tok-k { color: #E0A36F; }
.codeblock .tok-s { color: #C7C396; }

/* — Section spacing — */
.section { padding: 88px 0; }
.section-tight { padding: 56px 0; }

/* — Footer — */
.footer {
  border-top: 1px solid var(--rule);
  padding: 40px 24px;
  margin-top: 80px;
  font-size: 13.5px; color: var(--ink-mute);
}
.footer-inner { max-width: 1240px; margin: 0 auto; display: flex; gap: 24px; flex-wrap: wrap; align-items: center; }
.footer .grow { flex: 1; min-width: 200px; }
.footer a { color: var(--ink-soft); }

/* — Version pill (per-content vN.N tag) — */
.version-pill {
  display: inline-flex; align-items: center; gap: 4px;
  height: 22px; padding: 0 9px;
  border-radius: 999px;
  font-family: var(--f-mono); font-size: 11px; font-weight: 600;
  background: var(--accent-soft); color: var(--accent-deep);
  border: 1px solid rgba(201,100,66,0.22);
  letter-spacing: 0.02em;
}
.changelog-note {
  font-family: var(--f-body); font-size: 12px;
  color: var(--ink-mute); line-height: 1.5;
}
.changelog-note .date { font-family: var(--f-mono); color: var(--ink-faint); }
.changelog-note .sep { margin: 0 6px; opacity: 0.5; }

/* — Usage counter badge — */
.use-counter {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 11.5px; font-family: var(--f-mono);
  color: var(--ink-mute);
}
.use-counter::before {
  content: "↗"; color: var(--accent-deep); font-weight: 600;
}
.use-counter[data-loading="1"] { opacity: 0.45; }
.use-counter[data-empty="1"]::before { color: var(--ink-faint); opacity: 0.55; }

/* — Utility — */
.muted { color: var(--ink-mute); }
.eyebrow {
  font-family: var(--f-body); font-size: 12px; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent-deep);
}
.divider { height: 1px; background: var(--rule); border: 0; margin: 24px 0; }

/* — Mobile — */
@media (max-width: 720px) {
  .topbar-inner { padding: 10px 16px; gap: 8px; }
  .nav a { padding: 8px 10px; font-size: 14px; }
  .nav a.cta { padding: 8px 12px; }
  .brand .tag { display: none; }
  .section { padding: 56px 0; }
  h1 { font-size: clamp(34px, 9vw, 48px); }
}