/* ============================================================
   DESIGN TOKENS — từ ri-kos-demo-v1.2
   ============================================================ */
:root {
    --sidebar-w: 268px;
    --bg-page: #faf9f7;
    --bg-surface: #ffffff;
    --bg-sidebar: #0c1222;
    --bg-sidebar-item: #151e30;
    --bg-code: #f3f4f6;
    --bg-badge: #f0fdf4;
    --accent: #0d7377;
    --accent-l: rgba(13, 115, 119, 0.08);
    --learn: #2563eb;
    --learn-l: rgba(37, 99, 235, 0.08);
    --observe: #d97706;
    --observe-l: rgba(217, 119, 6, 0.08);
    --explore: #7c3aed;
    --explore-l: rgba(124, 58, 237, 0.08);
    --txt: #111827;
    --txt2: #4b5563;
    --txt3: #9ca3af;
    --txt-side: #94a3b8;
    --txt-side-a: #f1f5f9;
    --border: #e5e7eb;
    --border2: #d1d5db;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
    --info: #2563eb;
    --radius: 8px;
    --radius-lg: 12px;
    --f-brand: 'DM Serif Display', serif;
    --f-head: 'Figtree', sans-serif;
    --f-body: 'Crimson Pro', serif;
    --f-mono: 'JetBrains Mono', monospace;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html.dark {
    --bg-page: #0f172a;
    --bg-surface: #1e293b;
    --bg-sidebar: #020617;
    --bg-sidebar-item: #0f172a;
    --bg-code: #1e293b;
    --bg-badge: #064e3b;
    --accent: #14b8a6;
    --accent-l: rgba(20, 184, 166, 0.12);
    --txt: #e2e8f0;
    --txt2: #94a3b8;
    --txt3: #475569;
    --txt-side: #64748b;
    --txt-side-a: #f1f5f9;
    --border: #334155;
    --border2: #475569;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}