/* ============================================================
   Second Brain — Quantum Studio Edition
   High-Craft AI Knowledge Workspace
   Obsidian & Porcelain · Frosted Glass · Electric Gradient
   ============================================================ */

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

:root {
  /* surfaces — warm paper, the journal's notebook */
  --bg: #f8f5ef;
  --bg-card: #fffdf9;
  --bg-tag: #f2ede4;
  --bg-secondary: #f2ede4;
  --bg-confirm: rgba(99, 102, 241, 0.08);
  --bg-tag-confirmed: #6366f1;
  --surface-1: #fffdf9;
  --surface-2: #f2ede4;
  --surface-3: #e5ddcf;
  --surface-glass: rgba(255, 253, 249, 0.88);
  --card-bg: #fffdf9;
  --card-bg-hover: #fbf7f0;

  /* ink */
  --text-primary: #2a2520;
  --text-secondary: #5f574d;
  --text-tertiary: #978e83;
  --text-tag: #5f574d;
  --text-tag-confirmed: #ffffff;

  /* lines */
  --border: rgba(70, 52, 25, 0.1);
  --border-card: rgba(70, 52, 25, 0.08);
  --border-input: rgba(70, 52, 25, 0.14);
  --border-glass: rgba(70, 52, 25, 0.1);
  --line-soft: rgba(70, 52, 25, 0.07);

  /* accent — electric indigo & radiant gradient */
  --accent: #6366f1;
  --accent-press: #4338ca;
  --accent-soft: rgba(99, 102, 241, 0.08);
  --accent-soft-hover: rgba(99, 102, 241, 0.15);
  --accent-ink: #4f46e5;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 55%, #ec4899 100%);
  --accent-glow: rgba(99, 102, 241, 0.25);
  --good: #10b981;
  --good-soft: rgba(16, 185, 129, 0.1);
  --warn: #b45309;
  --warn-soft: rgba(245, 158, 11, 0.1);
  --danger: #ef4444;
  --danger-soft: rgba(239, 68, 68, 0.08);
  --on-accent: #ffffff;

  /* type */
  --font-sans: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-display: 'Plus Jakarta Sans', 'Geist', sans-serif;
  --font-serif: var(--font-sans);

  /* radii */
  --radius-card: 16px;
  --radius-pill: 9999px;
  --radius-tag: 9999px;
  --radius-bubble: 18px;
  --radius-input: 16px;

  /* elevation */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.03), 0 6px 16px -4px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.05), 0 16px 32px -6px rgba(0, 0, 0, 0.08);
  --shadow-float: 0 12px 32px -4px rgba(0, 0, 0, 0.08), 0 24px 48px -8px rgba(0, 0, 0, 0.06);
  --shadow-sheet: 0 -12px 48px rgba(0, 0, 0, 0.12);

  /* brand mark (S-ribbon) */
  --sb-mark: url('data:image/svg+xml;base64,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');

  /* motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.35, 0.5, 1);
}

html[data-theme='dark'] {
  /* surfaces — obsidian canvas */
  --bg: #090a0f;
  --bg-card: #221f17;
  --bg-tag: #171a26;
  --bg-secondary: #131520;
  --bg-confirm: rgba(99, 102, 241, 0.16);
  --bg-tag-confirmed: #6366f1;
  --surface-1: #11131c;
  --surface-2: #171a26;
  --surface-3: #1f2334;
  --surface-glass: rgba(17, 19, 28, 0.82);
  --card-bg: #11131c;
  --card-bg-hover: #161824;

  /* ink */
  --text-primary: #f4f4f6;
  --text-secondary: #9da0b5;
  --text-tertiary: #8a857f;
  --text-tag: #9da0b5;
  --text-tag-confirmed: #ffffff;

  /* lines */
  --border: rgba(255, 255, 255, 0.08);
  --border-card: rgba(255, 255, 255, 0.07);
  --border-input: rgba(255, 255, 255, 0.12);
  --border-glass: rgba(255, 255, 255, 0.09);
  --line-soft: rgba(255, 255, 255, 0.05);

  /* accent */
  --accent: #818cf8;
  --accent-press: #6366f1;
  --accent-soft: rgba(129, 140, 248, 0.14);
  --accent-soft-hover: rgba(129, 140, 248, 0.22);
  --accent-ink: #a5b4fc;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --accent-glow: rgba(99, 102, 241, 0.4);
  --good: #34d399;
  --good-soft: rgba(52, 211, 153, 0.12);
  --warn: #d9a15c;
  --warn-soft: rgba(251, 191, 36, 0.12);
  --danger: #f87171;
  --danger-soft: rgba(248, 113, 113, 0.12);
  --on-accent: #ffffff;

  /* elevation */
  --shadow-card: 0 2px 6px rgba(0, 0, 0, 0.3), 0 10px 24px -6px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 6px 18px rgba(0, 0, 0, 0.4), 0 18px 36px -4px rgba(0, 0, 0, 0.5);
  --shadow-float: 0 12px 36px -4px rgba(0, 0, 0, 0.6), 0 24px 60px -8px rgba(0, 0, 0, 0.7);
  --shadow-sheet: 0 -16px 54px rgba(0, 0, 0, 0.7);
}

html,
body {
  height: 100%;
  background: var(--bg);
  font-family: var(--font-sans);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow: hidden;
}

body {
  position: relative;
  background-attachment: fixed;
}

/* Ambient lighting effect */
body::before {
  content: '';
  position: fixed;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.12) 0%, rgba(139, 92, 246, 0.05) 45%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

html[data-theme='light'] body::before {
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.06) 0%, rgba(139, 92, 246, 0.02) 45%, transparent 70%);
}

/* Scrollbar refinement */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-input);
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

i.ti {
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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