:root{--bg-color:#f8fafc;--surface-color:#fff;--text-primary:#0f172a;--text-secondary:#64748b;--primary-color:#2563eb;--primary-hover:#1d4ed8;--border-color:#e2e8f0;--danger-color:#ef4444;--success-color:#10b981}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);justify-content:center;align-items:center;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.5;display:flex}.card{background:var(--surface-color);border:1px solid var(--border-color);width:500px;padding:32px;box-shadow:0 4px 6px -1px #0000000d}.btn{cursor:pointer;background:var(--primary-color);color:#fff;border:none;width:100%;margin-top:8px;padding:12px;font-size:15px;font-weight:600;transition:background .2s;display:block}.btn:hover{background:var(--primary-hover)}.btn-danger{background:var(--danger-color)}.btn-danger:hover{background:#dc2626}.btn:disabled{opacity:.7;cursor:not-allowed}.form-label{color:var(--text-secondary);margin-bottom:6px;font-size:13px;font-weight:600;display:block}.input{border:1px solid var(--border-color);width:100%;margin-bottom:20px;padding:12px;font-size:15px;transition:border-color .2s}.input:focus{border-color:var(--primary-color);outline:none;box-shadow:0 0 0 3px #2563eb1a}