:root,[data-theme=dark]{--bg: #0c0c14;--bg-card: #13131f;--bg-card-hover: #1a1a2e;--border: #1e1e30;--border-hover: #6366f1;--text: #d4d4dc;--text-secondary: #8888a0;--heading: #f0f0f5;--accent: #6366f1;--accent-light: #a5b4fc;--danger: #ef4444;--warning: #f59e0b}[data-theme=light]{--bg: #f8f9fa;--bg-card: #ffffff;--bg-card-hover: #f0f1f3;--border: #e0e0e8;--border-hover: #6366f1;--text: #3a3a48;--text-secondary: #7a7a8a;--heading: #1a1a28;--accent: #6366f1;--accent-light: #4f46e5;--danger: #dc2626;--warning: #d97706}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;transition:background .3s,color .3s}.settings-app{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1;max-width:720px;width:100%;margin:0 auto;padding:32px 24px}.site-footer{border-top:1px solid var(--border);padding:24px;text-align:center}.site-footer p{font-size:13px;color:var(--text-secondary)}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:8px;font-size:14px;font-weight:500;border:none;cursor:pointer;transition:background .2s,transform .1s}.btn:active{transform:scale(.98)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-light)}.btn-primary:disabled{opacity:.4;cursor:not-allowed}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{opacity:.85}.btn-outline{background:transparent;color:var(--accent);border:1px solid var(--border)}.btn-outline:hover{border-color:var(--accent);background:var(--bg-card)}.btn-sm{padding:6px 14px;font-size:13px}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:24px}@media (max-width: 768px){.main-content{padding:20px 16px}}