/* 后台布局 */
.admin-container { display: flex; min-height: 100vh; }
.admin-sidebar { width: 220px; background: #1a2332; color: #fff; padding: 20px; }
.admin-sidebar h2 { color: #fff; margin-bottom: 30px; }
.admin-sidebar ul { list-style: none; padding: 0; }
.admin-sidebar ul li { margin-bottom: 10px; }
.admin-sidebar ul li a { color: #aaa; display: block; padding: 8px 12px; border-radius: 4px; }
.admin-sidebar ul li a:hover { background: #2a3342; color: #fff; }
.admin-main { flex: 1; padding: 30px; background: #f5f7fa; }

/* 登录页 */
.login-page { display: flex; justify-content: center; align-items: center; height: 100vh; background: #f0f2f5; }
.login-box { background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 2px 12px rgba(0,0,0,0.1); width: 360px; }
.login-box h1 { text-align: center; margin-bottom: 30px; }
.login-box input { width: 100%; padding: 12px; margin-bottom: 15px; border: 1px solid #ddd; border-radius: 4px; }
.login-box button { width: 100%; padding: 12px; background: #0055a4; color: #fff; border: none; border-radius: 4px; cursor: pointer; }

/* 表格 */
.admin-table { width: 100%; background: #fff; border-collapse: collapse; margin-top: 20px; }
.admin-table th, .admin-table td { padding: 12px 15px; border-bottom: 1px solid #eee; text-align: left; }
.admin-table th { background: #f8f9fa; font-weight: 600; }

/* 错误