:root{--primary-color: #3498db;--primary-light: #e3f2fd;--secondary-color: #2ecc71;--background-color: #f5f7fa;--card-background: #ffffff;--text-color: #2c3e50;--text-muted: #7f8c8d;--border-color: #e1e8ed;--hover-color: #f0f3f7;--danger-color: #e74c3c;--warning-color: #f39c12;--success-color: #27ae60}[data-theme=dark]{--primary-color: #5dade2;--primary-light: #1a3a52;--secondary-color: #58d68d;--background-color: #1a1a1a;--card-background: #2d2d2d;--text-color: #ecf0f1;--text-muted: #95a5a6;--border-color: #34495e;--hover-color: #34495e;--danger-color: #ec7063;--warning-color: #f8c471;--success-color: #52be80}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;font-size:16px;line-height:1.5}.card{background-color:var(--card-background);border-radius:1rem;padding:1.5rem;box-shadow:0 2px 8px #0000001a;transition:all .3s}.card:hover{box-shadow:0 4px 16px #00000026;transform:translateY(-2px)}.btn{padding:.75rem 1.5rem;border:none;border-radius:.5rem;font-weight:600;cursor:pointer;transition:all .2s;font-size:1rem}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{opacity:.9;transform:translateY(-1px)}input,select{padding:.75rem;border:2px solid var(--border-color);border-radius:.5rem;background-color:var(--card-background);color:var(--text-color);font-size:1rem;transition:border-color .2s}input:focus,select:focus{outline:none;border-color:var(--primary-color)}.loading{display:flex;justify-content:center;align-items:center;padding:3rem}.spinner{border:4px solid var(--border-color);border-top:4px solid var(--primary-color);border-radius:50%;width:50px;height:50px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}