/* ========================================
   卡密代理系统 - 现代化UI样式 v2.0
   设计风格：简洁、现代、渐变、圆角
   ======================================== */

/* CSS 变量定义 */
:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --primary-light: #8499f5;
    --secondary: #764ba2;
    --success: #27ae60;
    --success-dark: #219a52;
    --danger: #e74c3c;
    --danger-dark: #c0392b;
    --warning: #f39c12;
    --warning-dark: #d68910;
    --info: #3498db;
    --info-dark: #2980b9;
    
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    --bg-primary: #f0f2f5;
    --bg-card: #ffffff;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    --transition: all 0.3s ease;
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-primary);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
}

/* ========================================
   导航栏样式
   ======================================== */
.navbar {
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.navbar .logo {
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    text-decoration: none;
    padding: 14px 0;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.navbar .logo:hover {
    color: var(--primary-light);
}

.navbar .nav-links {
    display: flex;
    align-items: center;
    gap: 5px;
}

.navbar .nav-links a {
    color: var(--gray-300);
    text-decoration: none;
    padding: 14px 16px;
    font-size: 14px;
    transition: var(--transition);
    border-radius: var(--radius-sm);
    position: relative;
}

.navbar .nav-links a:hover {
    color: #fff;
    background: rgba(255,255,255,0.1);
}

.navbar .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
}

.navbar .nav-links a:hover::after {
    width: 80%;
}

.navbar .user-info {
    color: var(--gray-400);
    font-size: 13px;
    padding: 0 15px;
    border-left: 1px solid var(--gray-600);
    margin-left: 10px;
}

.navbar .btn-logout {
    color: var(--danger) !important;
    font-weight: 600;
}

.navbar .btn-logout:hover {
    background: rgba(231, 76, 60, 0.1) !important;
}

.navbar .menu-toggle {
    display: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    padding: 10px;
}

.admin-nav {
    background: linear-gradient(135deg, #1a252f 0%, #2c3e50 100%);
}

/* ========================================
   容器和主要内容
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.main-content {
    padding: 30px 0;
    min-height: calc(100vh - 120px);
}

/* ========================================
   卡片样式
   ======================================== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 24px;
    margin-bottom: 24px;
    transition: var(--transition);
    border: 1px solid var(--gray-200);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--gray-800);
    border-bottom: 2px solid var(--gray-100);
    padding-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title::before {
    content: '';
    width: 4px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 2px;
}

/* ========================================
   表单样式
   ======================================== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--gray-700);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: var(--transition);
    background: var(--gray-50);
    color: var(--gray-800);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

/* ========================================
   按钮样式
   ======================================== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(39, 174, 96, 0.4);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(39, 174, 96, 0.5);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, var(--danger-dark) 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.4);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(231, 76, 60, 0.5);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning) 0%, var(--warning-dark) 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(243, 156, 18, 0.4);
}

.btn-warning:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(243, 156, 18, 0.5);
}

.btn-info {
    background: linear-gradient(135deg, var(--info) 0%, var(--info-dark) 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
}

.btn-info:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(52, 152, 219, 0.5);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* ========================================
   表格样式
   ======================================== */
.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    overflow: hidden;
}

.table th {
    background: var(--gray-50);
    padding: 14px 18px;
    text-align: left;
    font-size: 13px;
    color: var(--gray-600);
    font-weight: 600;
    border-bottom: 2px solid var(--gray-200);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table td {
    padding: 14px 18px;
    font-size: 14px;
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-700);
}

.table tr {
    transition: var(--transition);
}

.table tr:hover {
    background: var(--gray-50);
}

.table tr:last-child td {
    border-bottom: none;
}

/* 操作列样式 */
.table td .btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 600;
}

/* 用户列表表格 */
.table-users th {
    background: var(--gray-800);
    color: #fff;
    border: none;
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 600;
}

.table-users td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
}

.table-users tr:nth-child(even) {
    background: var(--gray-50);
}

/* ========================================
   徽章样式
   ======================================== */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: #fff;
    letter-spacing: 0.3px;
}

.badge-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
}

.badge-warning {
    background: linear-gradient(135deg, var(--warning) 0%, var(--warning-dark) 100%);
}

.badge-danger {
    background: linear-gradient(135deg, var(--danger) 0%, var(--danger-dark) 100%);
}

.badge-info {
    background: linear-gradient(135deg, var(--info) 0%, var(--info-dark) 100%);
}

.badge-secondary {
    background: linear-gradient(135deg, var(--gray-400) 0%, var(--gray-500) 100%);
}

/* ========================================
   统计卡片
   ======================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
    cursor: default;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    transition: height 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 15px 30px rgba(102, 126, 234, 0.2);
    border-color: var(--primary-light);
}

.stat-card:hover::before {
    height: 6px;
}

.stat-card .stat-value {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: transform 0.3s ease;
}

.stat-card:hover .stat-value {
    transform: scale(1.05);
}

.stat-card .stat-label {
    font-size: 13px;
    color: var(--gray-500);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 统计卡片颜色变体 */
.stat-card.stat-green::before {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
}

.stat-card.stat-green:hover {
    box-shadow: 0 15px 30px rgba(39, 174, 96, 0.2);
    border-color: var(--success);
}

.stat-card.stat-green .stat-value {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card.stat-orange::before {
    background: linear-gradient(135deg, #f39c12 0%, #d68910 100%);
}

.stat-card.stat-orange:hover {
    box-shadow: 0 15px 30px rgba(243, 156, 18, 0.2);
    border-color: #f39c12;
}

.stat-card.stat-orange .stat-value {
    background: linear-gradient(135deg, #f39c12 0%, #d68910 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card.stat-red::before {
    background: linear-gradient(135deg, var(--danger) 0%, var(--danger-dark) 100%);
}

.stat-card.stat-red:hover {
    box-shadow: 0 15px 30px rgba(231, 76, 60, 0.2);
    border-color: var(--danger);
}

.stat-card.stat-red .stat-value {
    background: linear-gradient(135deg, var(--danger) 0%, var(--danger-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card.stat-blue::before {
    background: linear-gradient(135deg, var(--info) 0%, var(--info-dark) 100%);
}

.stat-card.stat-blue:hover {
    box-shadow: 0 15px 30px rgba(52, 152, 219, 0.2);
    border-color: var(--info);
}

.stat-card.stat-blue .stat-value {
    background: linear-gradient(135deg, var(--info) 0%, var(--info-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card.stat-purple::before {
    background: linear-gradient(135deg, #9b59b6 0%, #8e44ad 100%);
}

.stat-card.stat-purple:hover {
    box-shadow: 0 15px 30px rgba(155, 89, 182, 0.2);
    border-color: #9b59b6;
}

.stat-card.stat-purple .stat-value {
    background: linear-gradient(135deg, #9b59b6 0%, #8e44ad 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   登录/注册页面
   ======================================== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    position: relative;
    overflow: hidden;
}

/* 动态背景光晕 */
.auth-page::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.15) 0%, transparent 70%);
    top: -200px;
    right: -150px;
    border-radius: 50%;
    animation: floatGlow 8s ease-in-out infinite;
}

.auth-page::after {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(118, 75, 162, 0.12) 0%, transparent 70%);
    bottom: -180px;
    left: -120px;
    border-radius: 50%;
    animation: floatGlow 6s ease-in-out infinite reverse;
}

@keyframes floatGlow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.1); }
}

.auth-box {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: 50px 45px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-box .auth-icon {
    text-align: center;
    font-size: 56px;
    margin-bottom: 10px;
    line-height: 1;
    animation: bounceIn 0.8s ease-out 0.1s both;
}

@keyframes bounceIn {
    0% { opacity: 0; transform: scale(0.3); }
    50% { transform: scale(1.08); }
    70% { transform: scale(0.95); }
    100% { opacity: 1; transform: scale(1); }
}

.auth-box h2 {
    text-align: center;
    margin-bottom: 8px;
    color: var(--gray-800);
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.auth-box .auth-subtitle {
    text-align: center;
    color: var(--gray-500);
    font-size: 14px;
    margin-bottom: 32px;
}

.auth-box .form-group {
    margin-bottom: 20px;
}

.auth-box .form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--gray-700);
    font-weight: 600;
    letter-spacing: 0.3px;
}

.auth-box .form-control {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 15px;
    background: var(--gray-50);
    transition: var(--transition);
    box-sizing: border-box;
}

.auth-box .form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.auth-box .form-control::placeholder {
    color: var(--gray-400);
}

.auth-box .btn {
    width: 100%;
    padding: 15px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: 0.5px;
    transition: var(--transition);
    margin-top: 10px;
}

.auth-box .btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.auth-box .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

.auth-box .btn-primary:active {
    transform: translateY(0);
}

.auth-box .btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(17, 153, 142, 0.4);
}

.auth-box .btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(17, 153, 142, 0.5);
}

.auth-box .switch-link {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: var(--gray-500);
}

.auth-box .switch-link a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
}

.auth-box .switch-link a:hover {
    color: var(--secondary);
}

/* ========================================
   提示消息
   ======================================== */
.alert {
    padding: 14px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.alert::before {
    content: '';
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.alert-info {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    color: #1976d2;
    border: 1px solid #90caf9;
}

.alert-info::before {
    content: 'i';
    background: #1976d2;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

.alert-success {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    color: #2e7d32;
    border: 1px solid #81c784;
}

.alert-success::before {
    content: '\2713';
    background: #2e7d32;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

.alert-danger {
    background: linear-gradient(135deg, #ffebee 0%, #ffcdd2 100%);
    color: #c62828;
    border: 1px solid #ef5350;
}

.alert-danger::before {
    content: '\2717';
    background: #c62828;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

.alert-warning {
    background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
    color: #e65100;
    border: 1px solid #ffb74d;
}

.alert-warning::before {
    content: '!';
    background: #e65100;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

/* ========================================
   分页
   ======================================== */
.pagination {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
    padding: 20px 0;
}

.pagination a,
.pagination span {
    padding: 12px 18px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--gray-700);
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    background: #fff;
    min-width: 44px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.pagination a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    transition: left 0.5s ease;
}

.pagination a:hover {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #fff;
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(102, 126, 234, 0.3);
}

.pagination a:hover::before {
    left: 100%;
}

.pagination .active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
    position: relative;
    z-index: 1;
}

.pagination .active::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: var(--radius-md);
    z-index: -1;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 0.7; }
    50% { opacity: 1; }
    100% { opacity: 0.7; }
}

.pagination .ellipsis {
    padding: 12px 8px;
    color: var(--gray-500);
    border: none;
    background: transparent;
    cursor: default;
}

.pagination .ellipsis:hover {
    background: transparent;
    color: var(--gray-500);
    transform: none;
    box-shadow: none;
    border: none;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
    color: var(--gray-400);
    text-align: center;
    padding: 24px 0;
    font-size: 13px;
    margin-top: auto;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
    .navbar .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 50px;
        left: 0;
        right: 0;
        background: var(--gray-800);
        padding: 15px;
        box-shadow: var(--shadow-lg);
    }

    .navbar .nav-links.show {
        display: flex;
    }

    .navbar .nav-links a {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
    }

    .navbar .menu-toggle {
        display: block;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 15px;
    }

    .stat-card .stat-value {
        font-size: 24px;
    }

    .auth-box {
        margin: 20px;
        padding: 35px 28px;
        border-radius: var(--radius-lg);
    }

    .auth-box h2 {
        font-size: 22px;
    }

    .auth-box .auth-icon {
        font-size: 44px;
    }

    .table-responsive {
        font-size: 13px;
    }

    .card {
        padding: 18px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .auth-box {
        padding: 28px 20px;
    }

    .auth-box h2 {
        font-size: 20px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 13px;
    }
}

/* ========================================
   价格标签
   ======================================== */
.price-tag {
    font-size: 20px;
    font-weight: 700;
    color: var(--danger);
    background: linear-gradient(135deg, var(--danger) 0%, var(--danger-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price-original {
    text-decoration: line-through;
    color: var(--gray-400);
    font-size: 14px;
    margin-left: 8px;
}

/* ========================================
   卡密展示
   ======================================== */
.card-key {
    background: var(--gray-50);
    border: 2px dashed var(--gray-300);
    padding: 18px;
    border-radius: var(--radius-md);
    font-family: 'Courier New', monospace;
    font-size: 16px;
    letter-spacing: 1px;
    margin: 12px 0;
    word-break: break-all;
    color: var(--gray-700);
    transition: var(--transition);
}

.card-key:hover {
    background: var(--gray-100);
    border-color: var(--primary);
}

/* ========================================
   动画效果
   ======================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

.slide-up {
    animation: slideUp 0.5s ease-out;
}

/* ========================================
   滚动条美化
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* 支付记录表格 */
.table-payments th {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 600;
}

.table-payments td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
    font-size: 13px;
}

.table-payments tr:nth-child(even) {
    background: var(--gray-50);
}

/* 搜索表单美化 */
.search-form .form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.search-form .form-group {
    margin-bottom: 0;
}

.search-form .form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--gray-600);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.search-form .form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    background: var(--gray-50);
    color: var(--gray-800);
    position: relative;
}

.search-form .form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.search-form .form-control:hover {
    border-color: var(--gray-300);
    background: #fff;
}

.search-form .form-row:last-child {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 10px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-200);
}

.search-form .form-row:last-child .btn {
    min-width: 100px;
    padding: 12px 24px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* 用户管理页面搜索和充值区域 */
.users-search-recharge {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.users-search-recharge .card {
    margin-bottom: 0;
}

.users-search-recharge .card-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--gray-100);
    display: flex;
    align-items: center;
    gap: 8px;
}

.users-search-recharge .card-title::before {
    content: '';
    width: 4px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 2px;
}

/* 充值表单样式 */
#rechargeForm {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: flex-end;
}

#rechargeForm input {
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: all 0.3s ease;
    background: var(--gray-50);
    color: var(--gray-800);
}

#rechargeForm input:focus {
    outline: none;
    border-color: var(--success);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(39, 174, 96, 0.1);
}

#rechargeForm input[name="user_id"] {
    width: 120px;
}

#rechargeForm input[name="amount"] {
    width: 140px;
}

#rechargeForm .btn-success {
    min-width: 100px;
    padding: 12px 24px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* 管理员余额显示 */
.admin-balance-info {
    font-size: 13px;
    color: var(--gray-600);
    margin-bottom: 12px;
    padding: 8px 12px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.admin-balance-info strong {
    color: var(--success);
    font-weight: 700;
}

.admin-balance-info .mode-indicator {
    color: var(--primary);
    font-weight: 600;
    padding: 2px 8px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 4px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

/* ========================================
   工具类
   ======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.p-20 { padding: 20px; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-10 { gap: 10px; }
.gap-20 { gap: 20px; }
.flex-wrap { flex-wrap: wrap; }
.flex-column { flex-direction: column; }
.w-100 { width: 100%; }