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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #f0f2f5;
    color: #333;
    line-height: 1.5;
}

a { color: #667eea; text-decoration: none; }
a:hover { text-decoration: underline; }

code {
    background: #f0f0f0;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

/* 登录页 */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: #fff;
    padding: 40px;
    border-radius: 12px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.login-box h1 {
    font-size: 22px;
    text-align: center;
    margin-bottom: 4px;
}

.login-box .subtitle {
    text-align: center;
    color: #999;
    font-size: 14px;
    margin-bottom: 24px;
}

.login-form label {
    display: block;
    margin-bottom: 16px;
}

.login-form label span {
    display: block;
    font-size: 13px;
    color: #666;
    margin-bottom: 6px;
}

.login-form input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 15px;
}

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

/* 按钮 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: background 0.2s;
}

.btn-primary {
    background: #667eea;
    color: #fff;
    width: 100%;
}

.btn-primary:hover {
    background: #5a6fd6;
    text-decoration: none;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-outline {
    background: #fff;
    color: #667eea;
    border: 1px solid #667eea;
}

.btn-outline:hover {
    background: #f0f4ff;
    text-decoration: none;
}

.btn-danger {
    background: #e74c3c;
    color: #fff;
}

.btn-danger:hover {
    background: #c0392b;
}

.delete-form {
    display: inline;
}

/* 提示 */
.alert {
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error {
    background: #fdecea;
    color: #c0392b;
}

.alert-success {
    background: #e8f5e9;
    color: #2e7d32;
}

/* 后台头部 */
.admin-header {
    background: #fff;
    border-bottom: 1px solid #e8e8e8;
    padding: 0 24px;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.admin-header h1 {
    font-size: 18px;
    font-weight: 600;
}

.admin-header nav a {
    margin-left: 20px;
    color: #666;
    font-size: 14px;
}

.admin-header nav a.active,
.admin-header nav a:hover {
    color: #667eea;
    text-decoration: none;
}

/* 主内容 */
.admin-main {
    max-width: 1200px;
    margin: 24px auto;
    padding: 0 24px;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: #fff;
    padding: 24px;
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: #667eea;
}

.stat-label {
    font-size: 14px;
    color: #999;
    margin-top: 4px;
}

/* 面板 */
.panel {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    padding: 24px;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.panel-header h2 {
    font-size: 16px;
}

.filter-form {
    display: flex;
    gap: 8px;
    align-items: center;
}

.filter-form select,
.filter-form input[type="date"] {
    padding: 6px 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 13px;
}

/* 表格 */
.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th, td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
}

th {
    background: #fafafa;
    font-weight: 600;
    color: #666;
    font-size: 13px;
}

.empty {
    text-align: center;
    color: #999;
    padding: 40px;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
}

.badge-mobile { background: #e8f5e9; color: #2e7d32; }
.badge-tablet { background: #e3f2fd; color: #1565c0; }
.badge-desktop { background: #f3e5f5; color: #7b1fa2; }
.badge-bot { background: #fafafa; color: #999; }

/* 分页 */
.pagination {
    display: flex;
    gap: 4px;
    margin-top: 20px;
    justify-content: center;
}

.pagination a {
    display: inline-block;
    padding: 6px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    color: #666;
    font-size: 13px;
}

.pagination a.active {
    background: #667eea;
    color: #fff;
    border-color: #667eea;
}

/* 二维码页 */
.qr-panel h2 {
    font-size: 18px;
    margin-bottom: 8px;
}

.qr-panel .hint {
    color: #999;
    font-size: 14px;
    margin-bottom: 24px;
}

.qr-display {
    text-align: center;
    margin-bottom: 24px;
}

.qr-display img {
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 12px;
    background: #fff;
}

.url-box {
    margin-bottom: 20px;
}

.url-box label {
    display: block;
    font-size: 13px;
    color: #666;
    margin-bottom: 6px;
}

.url-row {
    display: flex;
    gap: 8px;
}

.url-row input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    background: #fafafa;
}

.qr-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
}

.tips h3 {
    font-size: 15px;
    margin-bottom: 8px;
}

.tips ol {
    font-size: 14px;
    color: #666;
    line-height: 2;
    padding-left: 20px;
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .panel-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .filter-form {
        flex-wrap: wrap;
    }
}