/* ClawBrain · Design Tokens v2 — 2026.04
   Philosophy: ink + gray + single memory-purple accent.
   Fonts: Inter + JetBrains Mono. Minimal chrome, developer-first. */

:root {
  /* ─── Ink & surface (neutral, very slight warm tint) ─── */
  --ink:        #18181b;
  --ink-2:      #27272a;
  --ink-3:      #52525b;
  --muted:      #71717a;
  --muted-2:    #a1a1aa;
  --line:       #e4e4e7;
  --line-2:     #f1f1f3;
  --surface:    #f7f6f3;
  --surface-2:  #fafaf9;
  --canvas:     #ffffff;

  /* ─── Accent (memory-purple, used sparingly) ─── */
  --accent:     #4f46e5;
  --accent-ink: #3730a3;
  --accent-bg:  #eef2ff;
  --accent-tint:#f5f3ff;

  /* Pure black kept for deep/CTA surfaces only */
  --ink-deep:   #0a0a0a;

  /* ─── Semantic ─── */
  --ok:         #1f7a3a;
  --warn:       #8a5a00;
  --bad:        #b4252b;
  --ok-bg:      #f3faf5;
  --bad-bg:     #fff5f5;

  /* ─── Type ─── */
  --font-sans:  'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono:  'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  /* ─── Radii ─── */
  --r-xs: 3px; --r-sm: 4px; --r: 6px; --r-lg: 10px; --r-xl: 16px;

  /* ─── Shadows (very restrained) ─── */
  --sh-sm: 0 1px 2px rgba(24,24,27,.04);
  --sh:    0 2px 8px rgba(24,24,27,.06), 0 1px 2px rgba(24,24,27,.04);
  --sh-lg: 0 12px 32px -8px rgba(24,24,27,.12);

  /* ─── Spacing scale ─── */
  --pad-x: 40px;

  /* ─── Max widths ─── */
  --maxw: 1200px;
  --maxw-prose: 720px;
}

/* ─── Base ─── */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--canvas); color: var(--ink);
  font-family: var(--font-sans); font-size: 15px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01", "cv11", "tnum";
}
h1,h2,h3,h4 { margin: 0; font-weight: 700; letter-spacing: -.02em; line-height: 1.15; color: var(--ink); }
h1 { font-size: clamp(34px, 4.6vw, 52px); letter-spacing: -.03em; line-height: 1.05; }
h2 { font-size: clamp(26px, 3vw, 36px); }
h3 { font-size: 20px; font-weight: 600; letter-spacing: -.01em; }
h4 { font-size: 15px; font-weight: 600; letter-spacing: 0; }
p { margin: 0; color: var(--muted); }
a { color: var(--ink); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent); }
code, pre, .mono, .num { font-family: var(--font-mono); font-feature-settings: "tnum"; }
::selection { background: var(--accent-bg); color: var(--accent-ink); }

button { font-family: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

/* ─── Layout helpers ─── */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad-x); }
.prose { max-width: var(--maxw-prose); margin: 0 auto; padding: 0 var(--pad-x); }
.section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.section.surface { background: var(--surface); }
.section.ink { background: var(--ink); color: #fff; }
.section.ink h1, .section.ink h2, .section.ink h3 { color: #fff; }
.section.ink p { color: #aaa; }

/* Kicker: the mono eyebrow above titles */
.kicker {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent-ink); font-weight: 500;
  display: inline-flex; align-items: center; gap: 10px;
}
.kicker::before { content: ""; display: inline-block; width: 24px; height: 1px; background: var(--accent); }
.section.ink .kicker { color: #c4b5fd; }
.section.ink .kicker::before { background: #a5b4fc; }

/* Section head */
.sec-head { margin-bottom: 56px; }
.sec-head h2 { margin-top: 14px; max-width: 720px; }
.sec-head p.lead { margin-top: 12px; max-width: 620px; font-size: 16px; color: var(--muted); }

/* ─── Buttons (3 tiers) ─── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; font-size: 14px; font-weight: 600;
  border-radius: var(--r); transition: all .15s; text-decoration: none;
  letter-spacing: .005em; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-ink); color: #fff; transform: translateY(-1px); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-ink); color: #fff; transform: translateY(-1px); }
.btn-secondary { background: transparent; color: var(--ink); border: 1px solid var(--line); padding: 10px 19px; }
.btn-secondary:hover { border-color: var(--ink); color: var(--ink); }
.btn-tertiary { padding: 11px 2px; color: var(--ink); }
.btn-tertiary::after { content: " →"; font-family: var(--font-mono); transition: transform .15s; display: inline-block; }
.btn-tertiary:hover { color: var(--accent); }
.btn-tertiary:hover::after { transform: translateX(3px); }
.section.ink .btn-primary { background: #fff; color: var(--ink); }
.section.ink .btn-primary:hover { background: #eee; color: var(--ink); }
.section.ink .btn-secondary { color: #fff; border-color: #3a3a3d; }
.section.ink .btn-secondary:hover { border-color: #fff; }
.section.ink .btn-tertiary { color: #fff; }

/* ─── Tags / pills ─── */
.tag {
  display: inline-flex; align-items: center; gap: 5px;
  font-family: var(--font-mono); font-size: 11px;
  padding: 3px 8px; border: 1px solid var(--line); border-radius: var(--r-sm);
  color: var(--muted); background: var(--canvas);
  white-space: nowrap;
}
.tag-ok   { color: var(--ok);   border-color: #bfd9c7; background: var(--ok-bg); }
.tag-warn { color: var(--warn); border-color: #f0d69c; background: #fff9e8; }
.tag-bad  { color: var(--bad);  border-color: #f1c5c7; background: var(--bad-bg); }
.tag-accent { color: var(--accent-ink); border-color: #d0c9fa; background: var(--accent-tint); }

/* ─── Cards ─── */
.card {
  background: var(--canvas); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 28px; transition: border-color .2s, box-shadow .2s;
}
.card:hover { border-color: var(--ink-3); }

/* ─── Code blocks ─── */
pre.code, .code-block {
  background: var(--ink-deep); color: #e4e4e7; border-radius: var(--r-lg);
  padding: 20px 24px; overflow-x: auto; font-family: var(--font-mono);
  font-size: 13px; line-height: 1.75; margin: 0;
}
.code-block .k { color: #a5b4fc; }  /* keyword */
.code-block .s { color: #86efac; }  /* string */
.code-block .c { color: #71717a; }  /* comment */
.code-block .n { color: #fbbf24; }  /* number */
.code-win {
  background: var(--ink-deep); border-radius: var(--r-lg); overflow: hidden;
  border: 1px solid rgba(79,70,229,.3);
}
.code-win-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 10px 16px; border-bottom: 1px solid #27272a;
  font-family: var(--font-mono); font-size: 11px; color: #71717a;
}
.code-win-bar .d { width: 10px; height: 10px; border-radius: 50%; background: #3a3a3d; }
.code-win-bar .file { margin-left: auto; }

code.inline {
  font-family: var(--font-mono); font-size: .92em;
  background: var(--surface); padding: 1px 6px; border-radius: var(--r-xs);
  color: var(--ink);
}

/* ─── Nav ─── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: none; padding: 0 var(--pad-x); height: 60px;
  display: flex; align-items: center; justify-content: space-between; gap: 32px;
}
.nav-brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 700; color: var(--accent-ink); letter-spacing: -.01em;
  line-height: 1;
  background: var(--accent-bg);
  padding: 4px 10px; border-radius: var(--r);
}
.nav-brand:hover { color: var(--accent-ink); }
.nav-brand .mark-svg {
  width: 22px; height: 22px; display: inline-block; flex-shrink: 0;
}
.nav-brand .mark {
  width: 18px; height: 18px; border-radius: 4px;
  background: var(--ink); display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-family: var(--font-mono); font-weight: 700; font-size: 11px;
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  color: var(--muted); font-size: 13.5px; font-weight: 500;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-right { display: flex; align-items: center; gap: 16px; }
.nav-console {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--accent); color: #fff; padding: 7px 14px;
  border-radius: var(--r); font-size: 13px; font-weight: 600;
}
.nav-console:hover { background: var(--accent-ink); color: #fff; }
.nav-console::after { content: "→"; font-family: var(--font-mono); }

/* Nav dropdown */
.nav-drop { position: relative; }
.nav-drop > a { cursor: pointer; display: inline-flex; align-items: center; gap: 4px; }
.nav-drop > a::after { content: "▾"; font-size: 9px; opacity: .6; }
.nav-drop-menu {
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
  padding-top: 10px; /* hover-bridge so cursor can cross to menu */
  min-width: 220px;
  opacity: 0; visibility: hidden; transition: opacity .15s; z-index: 200;
  pointer-events: none;
}
.nav-drop-menu > .nav-drop-inner {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--r-lg); box-shadow: var(--sh-lg); padding: 8px;
}
.nav-drop:hover .nav-drop-menu,
.nav-drop:focus-within .nav-drop-menu { opacity: 1; visibility: visible; pointer-events: auto; }
.nav-drop-menu a {
  display: block; padding: 10px 12px; font-size: 13px; color: var(--muted);
  border-radius: var(--r); line-height: 1.4;
}
.nav-drop-menu a b { display: block; color: var(--ink); font-weight: 600; margin-bottom: 2px; font-size: 13px; }
.nav-drop-menu a small { color: var(--muted-2); font-size: 11.5px; display: block; }
.nav-drop-menu a:hover { background: var(--surface); }

/* ─── Footer ─── */
footer.ft {
  border-top: 1px solid var(--line); padding: 56px var(--pad-x) 64px;
  background: var(--canvas); margin-top: 0;
}
.ft-grid {
  max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px;
}
.ft-col h4 {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--muted); font-weight: 500; margin-bottom: 14px;
}
.ft-col a { display: block; font-size: 13.5px; color: var(--muted); padding: 4px 0; }
.ft-col a:hover { color: var(--ink); }
.ft-brand-block .nav-brand { display: inline-flex; margin-bottom: 14px; line-height: 1; padding: 6px 14px; }
.ft-brand-block .nav-brand .mark-svg { width: 22px; height: 22px; }
.ft-brand-block p { font-size: 13px; max-width: 280px; line-height: 1.7; margin: 0; color: var(--muted); }
.ft-bottom {
  max-width: var(--maxw); margin: 48px auto 0; padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-mono); font-size: 11.5px; color: var(--muted);
  flex-wrap: wrap; gap: 12px;
}
.ft-bottom a { color: var(--muted); margin-left: 18px; }
.ft-bottom a:hover { color: var(--ink); }

/* ─── Utility ─── */
.mono { font-family: var(--font-mono); }
.tnum { font-variant-numeric: tabular-nums; }
.muted { color: var(--muted); }
.hl { color: var(--accent); }
.ink-bg { background: var(--ink); color: #fff; }
.grid-bg {
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 80px 80px;
}

/* ─── Responsive ─── */
@media (max-width: 900px) {
  :root { --pad-x: 20px; }
  .section { padding: 64px 0; }
  .nav-links { display: none; }
  .ft-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}