/* สีแบรนด์ร่วมระหว่าง landing และ login อ้างอิง mobile dark theme */
:root{color-scheme:dark;--rt-bg:#0c0e12;--rt-bg-muted:#12151c;--rt-surface:#161b22;--rt-elevated:#1c212b;--rt-text:#f3f4f6;--rt-secondary:#d1d5db;--rt-muted:#9ca3af;--rt-border:#2d3748;--rt-accent:#a78bfa;--rt-accent-solid:#7c3aed;--rt-positive:#22c55e;--rt-highlight:#f3be4b;--rt-radius:20px}