/* ═══════════════════════════════════════════════════════════
   SPARK I/O — BRAND TOKENS
   The single source of truth for color, type, space, motion.
   Imported by every page. Do not redeclare these locally.
   ═══════════════════════════════════════════════════════════ */

/* ── Fonts ─────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Fraunces:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600&family=Geist:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* ── Color: surfaces ──────────────────────────────────── */
  --bg:            #faf8f3;   /* warm cream — page background */
  --bg-elev:       #f2efe7;   /* slight warm shift — cards, raised surfaces */
  --bg-card:       #ffffff;   /* pure white — primary cards */
  --bg-ink:        #0a0b0d;   /* obsidian — inverted sections */

  /* ── Color: ink (text, marks) ─────────────────────────── */
  --ink:           #0a0b0d;   /* obsidian — primary text */
  --ink-dim:       #55534d;   /* warm grey — secondary text */
  --ink-mute:      #8a877e;   /* muted — labels, meta */
  --ink-soft:      #b8b4a8;   /* softest — decorative */
  --ink-inv:       #faf8f3;   /* on dark */
  --ink-inv-dim:   #9a9992;   /* on dark, secondary */

  /* ── Color: accent (ember) ────────────────────────────── */
  --accent:        #c77a2a;   /* ember — primary accent */
  --accent-deep:   #9a5a1c;   /* darker ember — hover states */
  --accent-soft:   rgba(199,122,42,0.10);   /* ember wash */
  --accent-ink:    #faf8f3;   /* text on accent */

  /* ── Color: structure ─────────────────────────────────── */
  --border:        rgba(10,11,13,0.10);
  --border-strong: rgba(10,11,13,0.22);
  --border-inv:    rgba(255,255,255,0.12);

  /* ── Typography ───────────────────────────────────────── */
  --font-display:  'Instrument Serif', 'Fraunces', Georgia, serif;
  --font-logo:     'Fraunces', 'Instrument Serif', Georgia, serif;
  --font-body:     'Geist', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:     'JetBrains Mono', ui-monospace, Menlo, monospace;

  /* ── Spacing (4px baseline) ───────────────────────────── */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;
  --s-10: 128px;

  /* ── Radii ────────────────────────────────────────────── */
  --r-1: 4px;
  --r-2: 8px;
  --r-3: 12px;
  --r-4: 16px;
  --r-5: 24px;
  --r-full: 999px;

  /* ── Shadows (subtle, warm) ───────────────────────────── */
  --shadow-xs: 0 1px 2px rgba(10,11,13,0.04);
  --shadow-sm: 0 2px 8px rgba(10,11,13,0.06);
  --shadow-md: 0 8px 24px rgba(10,11,13,0.08);
  --shadow-lg: 0 24px 60px rgba(10,11,13,0.12);

  /* ── Motion ───────────────────────────────────────────── */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast: 150ms;
  --dur-med: 280ms;
  --dur-slow: 600ms;

  /* ── Layout ───────────────────────────────────────────── */
  --container: 1360px;
  --container-narrow: 980px;
  --gutter: 40px;
}

/* ── Base resets ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ── The ember slash — the hinge of the identity ─────────── */
.slash-italic {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--accent);
  display: inline-block;
}

/* ── The S/O + Wordmark lockup ───────────────────────────── */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: inherit;
}
.brand-lockup-mark {
  font-family: var(--font-logo);
  font-weight: 600;
  font-size: 28px;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--ink);
  white-space: nowrap;
}
.brand-lockup-mark .slash {
  font-style: italic;
  color: var(--accent);
  margin: 0 -0.05em;
  display: inline-block;
}
.brand-lockup-divider {
  width: 1px;
  height: 26px;
  background: var(--border);
}
.brand-lockup-text {
  font-family: var(--font-logo);
  font-weight: 600;
  font-size: 28px;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--ink);
  white-space: nowrap;
}
.brand-lockup-text .slash {
  font-style: italic;
  color: var(--accent);
  margin: 0 0.02em;
  display: inline-block;
}