:root{--primary: #2563eb;--primary-hover: #1d4ed8;--bg: #0f172a;--bg-surface: #1e293b;--bg-card: #334155;--text: #f1f5f9;--text-muted: #94a3b8;--border: #475569;--success: #22c55e;--danger: #ef4444;--radius: 8px;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .3)}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}#app{min-height:100vh;display:flex;flex-direction:column}button{cursor:pointer;border:none;border-radius:var(--radius);padding:8px 16px;font-size:14px;font-weight:500;transition:all .2s ease}button:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-secondary{background:var(--bg-card);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){background:var(--border)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626}input,textarea,select{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);padding:8px 12px;font-size:14px;outline:none;transition:border-color .2s}input:focus,textarea:focus,select:focus{border-color:var(--primary)}textarea{resize:vertical;font-family:Cascadia Code,Fira Code,monospace}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-surface)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}