:root{--bg: #f5f6f8;--sidebar: #1a2332;--sidebar-active: #2a3a52;--text: #1a2332;--muted: #6b7280;--border: #e5e7eb;--accent: #2563eb;--accent-hover: #1d4ed8;--danger: #dc2626;--success: #059669;--warning: #d97706}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);font-size:14px}.shell{display:flex;min-height:100vh}.sidebar{width:220px;background:var(--sidebar);color:#fff;padding:20px 0;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}.brand{font-size:20px;font-weight:700;padding:0 20px}.brand-sub{font-size:12px;color:#9ca3af;padding:0 20px 20px}.sidebar nav{flex:1;display:flex;flex-direction:column;gap:2px;padding:0 10px}.sidebar nav a{color:#d1d5db;text-decoration:none;padding:10px 12px;border-radius:6px;font-size:14px}.sidebar nav a:hover{background:#243350}.sidebar nav a.active{background:var(--sidebar-active);color:#fff}.logout-btn{margin:10px;padding:10px;background:transparent;border:1px solid #4b5563;color:#d1d5db;border-radius:6px;cursor:pointer}.logout-btn:hover{background:#243350}.main{flex:1;padding:24px;max-width:1400px}.page-title{font-size:24px;font-weight:700;margin-bottom:4px}.page-sub{color:var(--muted);margin-bottom:20px}.card{background:#fff;border:1px solid var(--border);border-radius:8px;padding:20px;margin-bottom:16px}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:20px}.stat{background:#fff;border:1px solid var(--border);border-radius:8px;padding:16px}.stat .num{font-size:28px;font-weight:700}.stat .label{color:var(--muted);font-size:13px;margin-top:4px}table{width:100%;border-collapse:collapse;background:#fff}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border)}th{background:#f9fafb;font-weight:600;font-size:13px;color:var(--muted)}tr:hover td{background:#f9fafb}.btn{padding:8px 16px;border:none;border-radius:6px;background:var(--accent);color:#fff;cursor:pointer;font-size:14px}.btn:hover{background:var(--accent-hover)}.btn-secondary{background:#e5e7eb;color:var(--text)}.btn-secondary:hover{background:#d1d5db}.btn-danger{background:var(--danger)}.btn-danger:hover{background:#b91c1c}.btn-small{padding:4px 10px;font-size:13px}.badge{display:inline-block;padding:2px 8px;border-radius:12px;font-size:12px;font-weight:600}.badge-active{background:#d1fae5;color:#065f46}.badge-suspended{background:#fee2e2;color:#991b1b}.badge-pending{background:#fef3c7;color:#92400e}.badge-info{background:#dbeafe;color:#1e40af}.form-group{margin-bottom:12px}.form-group label{display:block;margin-bottom:4px;font-weight:600;font-size:13px}.form-group input,.form-group select,.form-group textarea{width:100%;padding:8px 12px;border:1px solid var(--border);border-radius:6px;font-size:14px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:100}.modal{background:#fff;border-radius:8px;padding:24px;width:90%;max-width:560px;max-height:90vh;overflow-y:auto}.modal h3{margin-bottom:16px}.modal-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:16px}.error{background:#fee2e2;color:#991b1b;padding:12px;border-radius:6px;margin-bottom:16px}.success{background:#d1fae5;color:#065f46;padding:12px;border-radius:6px;margin-bottom:16px}.tabs{display:flex;gap:8px;margin-bottom:16px;border-bottom:1px solid var(--border)}.tabs button{padding:8px 16px;background:none;border:none;border-bottom:2px solid transparent;cursor:pointer;font-size:14px;color:var(--muted)}.tabs button.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}