:root{--bg:#fafafa;--fg:#18181b;--muted:#71717a;--border:#d4d4d8;--accent:#2563eb;--accent-hover:#1d4ed8;--success:#16a34a;--error:#dc2626;--card:#ffffff}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Sarabun,Noto Sans Thai,sans-serif;font-size:15px;line-height:1.5}button{font-family:inherit;font-size:inherit;cursor:pointer}