*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:#f4f6f8;color:#1f2933}.center{display:flex;align-items:center;justify-content:center;min-height:100vh}.layout{display:flex;min-height:100vh}.sidebar{width:230px;background:#10243e;color:#dbe4ee;padding:16px;display:flex;flex-direction:column;gap:8px}.brand{font-size:20px;font-weight:700;color:#fff}.tenant{font-size:12px;opacity:.7;margin-bottom:16px}.sidebar nav{display:flex;flex-direction:column;gap:4px}.sidebar nav a{color:#dbe4ee;text-decoration:none;padding:8px 10px;border-radius:6px}.sidebar nav a:hover{background:#1c3553}.sidebar nav a.active{background:#2563eb;color:#fff}.logout{margin-top:auto;background:none;border:1px solid #4a5c72;color:#dbe4ee;padding:8px;border-radius:6px;cursor:pointer}.content{flex:1;padding:24px 32px;max-width:1100px}.card{background:#fff;border:1px solid #e3e8ee;border-radius:8px;padding:16px;margin-bottom:16px}.chapter-head{background:none;border:none;font-size:15px;cursor:pointer;text-align:left;width:100%}.muted{color:#6b7683;font-size:13px}table{width:100%;border-collapse:collapse;background:#fff;border-radius:8px;overflow:hidden}th,td{text-align:left;padding:8px 12px;border-bottom:1px solid #eef1f5;font-size:14px}th{background:#f0f4f8}code{background:#eef1f5;padding:1px 5px;border-radius:4px;font-size:12px}input,select,button{padding:8px 10px;border:1px solid #ccd3db;border-radius:6px;font-size:14px}button{background:#2563eb;color:#fff;cursor:pointer;border:none}button:disabled{opacity:.5;cursor:default}.login{display:flex;flex-direction:column;gap:10px;width:320px}.login h1{margin:0 0 8px}.tenant-name{font-size:15px;font-weight:600;color:#2563eb;margin-bottom:4px}.admin-sidebar{background:#3b2d5e}