:root {
  --surface-0: #f4f7fb;
  --surface-1: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #eef2f7;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-soft: #e2e8f0;
  --border-strong: #cbd5e1;
  --shadow-soft: 0 14px 30px -24px rgba(15, 23, 42, 0.3);
  --selection: rgba(59, 130, 246, 0.25);

  --accent-500: #2563eb;
  --accent-600: #1d4ed8;
  --accent-100: #dbeafe;
  --accent-050: #eff6ff;

  --success-500: #059669;
  --danger-500: #dc2626;
  --warning-500: #d97706;

  --app-bg-gradient: radial-gradient(circle at top, #eff6ff, #f8fafc 38%, #f1f5f9 100%);
  --code-bg: #f1f5f9;
  --code-inline-bg: rgba(15, 23, 42, 0.06);
  --scrollbar-thumb: #cbd5e1;
}

:root[data-theme='dark'] {
  --surface-0: #020617;
  --surface-1: #0f172a;
  --surface-2: #111827;
  --surface-3: #1e293b;
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-soft: #334155;
  --border-strong: #475569;
  --shadow-soft: 0 20px 36px -26px rgba(2, 6, 23, 0.8);
  --selection: rgba(37, 99, 235, 0.35);

  --app-bg-gradient: radial-gradient(circle at top, #111827, #0b1220 38%, #020617 100%);
  --code-bg: #0b1220;
  --code-inline-bg: rgba(148, 163, 184, 0.22);
  --scrollbar-thumb: #475569;
}

html,
body {
  transition: background-color 0.2s ease, color 0.2s ease;
}

body {
  background: var(--app-bg-gradient) !important;
  color: var(--text-primary) !important;
}

::selection {
  background: var(--selection);
}

.theme-surface {
  background: var(--surface-1);
  border-color: var(--border-soft);
  color: var(--text-primary);
}

.theme-muted {
  color: var(--text-muted);
}

.theme-scroll::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

.theme-scroll::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 10px;
}