/* 全局样式 */
:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2ecc71;
    --secondary-dark: #27ae60;
    --text-color: #333;
    --light-text: #777;
    --bg-color: #f5f7fa;
    --card-bg: #fff;
    --border-color: #e1e4e8;
    --success-color: #2ecc71;
    --error-color: #e74c3c;
    --warning-color: #f39c12;
    --info-color: #3498db;
    --reset-color: #95a5a6;
    --reset-dark: #7f8c8d;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 头部样式 */
header {
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 15px 0;
    margin-bottom: 30px;
}

.header-content {
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    text-align: center;
}

/* 主要内容区域 */
main {
    flex: 1;
    padding: 20px 0;
}

/* 卡片样式 */
.card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 30px;
    margin-bottom: 30px;
}

.card-header {
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    text-align: center;
}

.card-title {
    font-size: 22px;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.card-subtitle {
    font-size: 14px;
    color: var(--light-text);
}

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

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

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    margin: -10px;
}

.form-col {
    flex: 1;
    padding: 10px;
    min-width: 200px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    text-decoration: none;
    text-align: center;
    transition: background-color 0.3s, transform 0.1s;
}

.btn:hover {
    background-color: var(--primary-dark);
}

.btn:active {
    transform: translateY(1px);
}

.btn-success {
    background-color: var(--secondary-color);
}

.btn-success:hover {
    background-color: var(--secondary-dark);
}

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

/* 重置按钮样式 */
.reset-btn {
    background-color: var(--reset-color);
    margin-top: 15px;
}

.reset-btn:hover {
    background-color: var(--reset-dark);
}

.reset-container {
    text-align: center;
    margin-top: 20px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

/* 消息样式 */
.message {
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-left: 4px solid transparent;
}

.success-message {
    background-color: #d4edda;
    color: #155724;
    border-left-color: var(--success-color);
}

.error-message {
    background-color: #f8d7da;
    color: #721c24;
    border-left-color: var(--error-color);
}

.info-message {
    background-color: #d1ecf1;
    color: #0c5460;
    border-left-color: var(--info-color);
}

.warning-message {
    background-color: #fff3cd;
    color: #856404;
    border-left-color: var(--warning-color);
}

/* 结果展示区域 */
.result-box {
    background-color: #f8f9fa;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 20px;
    margin-top: 20px;
    text-align: center;
}

.short-url {
    font-size: 18px;
    color: var(--primary-color);
    word-break: break-all;
    margin-bottom: 15px;
    padding: 10px;
    background-color: rgba(52, 152, 219, 0.1);
    border-radius: 4px;
}

.copy-btn {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
    margin-right: 10px;
}

.copy-btn:hover {
    background-color: var(--secondary-dark);
}

/* 二维码样式 */
.qrcode-container {
    margin-top: 20px;
    text-align: center;
}

.qrcode-img {
    max-width: 200px;
    border: 1px solid var(--border-color);
    padding: 10px;
    background-color: white;
    border-radius: 4px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.result-actions {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 10px;
}

/* 页脚样式 */
footer {
    background-color: var(--card-bg);
    padding: 20px 0;
    text-align: center;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

.footer-text {
    color: var(--light-text);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
    }
    
    .form-col {
        min-width: 100%;
    }
    
    .result-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .copy-btn {
        margin-right: 0;
        margin-bottom: 10px;
    }
}

/* 后台管理样式 */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: #2c3e50;
    color: white;
    padding: 20px 0;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 0 20px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 20px;
}

.sidebar-title {
    font-size: 20px;
    color: white;
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav-item {
    margin-bottom: 5px;
}

.sidebar-nav-link {
    display: block;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

.sidebar-nav-link:hover,
.sidebar-nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-left-color: var(--primary-color);
}

.sidebar-nav-link i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

.admin-content {
    flex: 1;
    padding: 20px;
    background-color: var(--bg-color);
    overflow-y: auto;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.admin-title {
    font-size: 24px;
    color: var(--text-color);
}

/* 表格样式 */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: var(--text-color);
}

.table tr:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

.table-actions {
    display: flex;
    gap: 10px;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 14px;
}

.btn-edit {
    background-color: var(--info-color);
}

.btn-delete {
    background-color: var(--error-color);
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    margin-top: 30px;
    list-style: none;
}

.pagination-item {
    margin: 0 5px;
}

.pagination-link {
    display: block;
    padding: 8px 12px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s;
}

.pagination-link:hover,
.pagination-link.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 统计卡片 */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.stat-title {
    font-size: 14px;
    color: var(--light-text);
    margin-bottom: 10px;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 10px;
}

.stat-icon {
    align-self: flex-end;
    font-size: 24px;
    color: rgba(52, 152, 219, 0.2);
}

/* 响应式后台布局 */
@media (max-width: 992px) {
    .admin-layout {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        padding: 10px 0;
    }
    
    .sidebar-nav {
        display: flex;
        flex-wrap: wrap;
        padding: 0 10px;
    }
    
    .sidebar-nav-item {
        margin: 5px;
    }
    
    .sidebar-nav-link {
        padding: 8px 15px;
        border-left: none;
        border-radius: 4px;
    }
}