/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 15px 0;
    margin-bottom: 30px;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar .logo {
    font-size: 24px;
    font-weight: bold;
    color: #667eea;
}

.navbar .nav-links a {
    margin-left: 30px;
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.navbar .nav-links a:hover {
    color: #667eea;
}

/* 卡片 */
.card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

/* 套餐卡片 */
.packages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.package-card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
    overflow: hidden;
}

.package-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.package-card.hot::before {
    content: '🔥 热门';
    position: absolute;
    top: 10px;
    right: -30px;
    background: #ff6b6b;
    color: white;
    padding: 5px 40px;
    transform: rotate(45deg);
    font-size: 12px;
    font-weight: bold;
}

.package-card h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 22px;
}

.package-card .energy {
    font-size: 32px;
    font-weight: bold;
    color: #333;
    margin: 10px 0;
}

.package-card .duration {
    color: #666;
    margin-bottom: 10px;
}

.package-card .price {
    font-size: 28px;
    color: #667eea;
    font-weight: bold;
    margin: 15px 0;
}

.package-card .original-price {
    text-decoration: line-through;
    color: #999;
    font-size: 16px;
    margin-left: 10px;
}

.package-card .description {
    color: #666;
    font-size: 14px;
    margin: 15px 0;
    line-height: 1.6;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-success {
    background: #51cf66;
    color: white;
}

.btn-danger {
    background: #ff6b6b;
    color: white;
}

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

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
}

/* 表格 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #333;
}

.table tr:hover {
    background: #f8f9fa;
}

/* 状态标签 */
.badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: #d3f9d8;
    color: #2b8a3e;
}

.badge-warning {
    background: #fff3bf;
    color: #e67700;
}

.badge-danger {
    background: #ffe3e3;
    color: #c92a2a;
}

.badge-info {
    background: #d0ebff;
    color: #1971c2;
}

/* 响应式 */
@media (max-width: 768px) {
    .packages-grid {
        grid-template-columns: 1fr;
    }
    
    .navbar .container {
        flex-direction: column;
    }
    
    .navbar .nav-links {
        margin-top: 15px;
    }
    
    .navbar .nav-links a {
        margin: 0 10px;
    }
}

/* 加载动画 */
.loading {
    text-align: center;
    padding: 40px;
    color: #667eea;
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}