:root{--bg: #f5f7fa;--panel: #ffffff;--border: #d9dee5;--text: #1f2937;--muted: #6b7280;--primary: #2563eb;--primary-hover: #1d4ed8;--danger: #dc2626;--success: #16a34a}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}a{color:var(--primary);text-decoration:none}button{cursor:pointer}.container{max-width:1100px;margin:0 auto;padding:24px}.card{background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:20px;margin-bottom:20px}.form-grid{display:grid;gap:12px}.form-grid label{display:flex;flex-direction:column;gap:4px;font-size:14px;color:var(--muted)}input,select,textarea{padding:8px 10px;border:1px solid var(--border);border-radius:6px;font-size:14px}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary)}.btn{display:inline-block;padding:8px 14px;border:none;border-radius:6px;background:var(--primary);color:#fff;font-size:14px}.btn:hover{background:var(--primary-hover)}.btn.secondary{background:#e5e7eb;color:var(--text)}.btn.danger{background:var(--danger)}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--border);font-size:14px}th{color:var(--muted);font-weight:600}.error{color:var(--danger);font-size:14px}.success{color:var(--success);font-size:14px}.nav{display:flex;gap:16px;align-items:center;border-bottom:1px solid var(--border);padding:0 24px;background:var(--panel)}.nav a{padding:14px 4px;color:var(--muted);font-size:14px}.nav a.active{color:var(--primary);font-weight:600;border-bottom:2px solid var(--primary)}.nav .spacer{flex:1}