:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;

    --light-bg: #f8f9fa;
    --dark-bg: #343a40;
    --white: #fff;
    --black: #000;

    --text-color: #343a40;
    --subtle-text-color: #6c757d;

    --border-color: #dee2e6;
    --input-background: #e9ecef;

    --success-bg: #d4edda;
    --success-text: #155724;
    --success-border: #c3e6cb;

    --error-bg: #f8d7da;
    --error-text: #721c24;
    --error-border: #f5c6cb;

    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

/* 全局重置和基本样式 */
body {
    font-family: var(--font-family-base);
    background-color: var(--light-bg);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* 登录页面样式 */
body.login-body {
    background: linear-gradient(120deg, #74ebd5 0%, #ACB6E5 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-family-base);
}

.login-container {
    background: var(--white);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(44, 62, 80, 0.15);
    padding: 40px 32px 32px 32px;
    width: 350px;
    max-width: 90vw;
    text-align: center;
    animation: fadeIn 0.8s;
}

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

.login-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.login-form input {
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.login-form input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.login-form button {
    padding: 12px;
    background: linear-gradient(90deg, #74ebd5 0%, #ACB6E5 100%);
    border: none;
    border-radius: 8px;
    color: var(--white);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(44, 62, 80, 0.08);
    transition: background 0.2s, transform 0.1s ease-in-out;
}

.login-form button:hover {
    background: linear-gradient(90deg, #ACB6E5 0%, #74ebd5 100%);
    transform: translateY(-1px);
}

.login-form button:active {
    transform: translateY(0);
}

.error-message {
    color: var(--error-text);
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    border-radius: 6px;
    padding: 8px 0;
    margin-bottom: 10px;
    font-size: 0.98rem;
    display: none;
}

.login-footer {
    margin-top: 18px;
    font-size: 0.95rem;
    color: var(--subtle-text-color);
}

/* 后台管理界面样式 */
.admin-layout {
    min-height: 100vh;
    padding: 20px;
    background-color: var(--light-bg);
}

.admin-container {
    max-width: 1400px; /* 增加最大宽度 */
    margin: 20px auto;
    padding: 20px;
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    border-radius: 8px;
}

/* 头部控件 */
.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.admin-h1 {
    margin: 0;
    font-size: 1.8em; /* 增大标题 */
    color: var(--dark-bg);
}

/* 按钮样式 */
.admin-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    color: var(--white);
    font-size: 1rem;
    transition: background-color 0.2s, transform 0.1s ease-in-out;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
}

.admin-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

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

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

.admin-btn-danger {
    background-color: var(--danger-color);
}

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

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

.btn-icon {
    font-size: 1.1em;
}

/* 消息提示 */
.admin-message {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    animation: fadeIn 0.3s;
    font-weight: 500;
}

.admin-message.success {
    background: var(--success-bg);
    color: var(--success-text);
    border: 1px solid var(--success-border);
}

.admin-message.error {
    background: var(--error-bg);
    color: var(--error-text);
    border: 1px solid var(--error-border);
}

/* Admin forms */
.admin-form {
    max-width: 700px; /* 增加表单最大宽度 */
    margin: 0 auto;
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--light-bg);
}

.admin-form-group {
    margin-bottom: 1.5rem;
}

.admin-form-group label {
    display: block;
    margin-bottom: 0.8rem; /* 增加标签间距 */
    font-weight: 600;
    color: var(--text-color);
}

.admin-form-group input[type="text"],
.admin-form-group input[type="password"],
.admin-form-group input[type="url"],
.admin-form-group input[type="number"],
.admin-select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    background-color: var(--white);
}

.admin-form-group input:focus,
.admin-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.admin-input-group {
    display: flex;
    align-items: stretch;
}

.admin-input-prefix {
    padding: 10px 12px;
    background: var(--input-background);
    border: 1px solid var(--border-color);
    border-right: none;
    border-radius: 6px 0 0 6px;
    color: var(--subtle-text-color);
    display: flex;
    align-items: center;
}

.admin-input-group input {
    border-radius: 0 6px 6px 0;
    border-left: none;
}

.admin-form-divider {
    margin: 2rem 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

.admin-form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    justify-content: flex-end; /* 按钮右对齐 */
}

.admin-checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: normal;
}

.admin-current-user {
    padding: 0.5rem 1rem;
    background: var(--input-background);
    border-radius: 4px;
    font-weight: 500;
    color: var(--text-color);
}

.admin-form-notice {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--subtle-text-color);
}

/* 统计卡片 */
.admin-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.admin-stat-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease-in-out;
}

.admin-stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--subtle-text-color);
}

/* 标签页 */
.admin-header-tabs {
    display: flex;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 20px;
}

.admin-tab {
    background: none;
    border: none;
    padding: 12px 20px;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--subtle-text-color);
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease-in-out;
    display: flex;
    align-items: center;
    gap: 8px;
}

.admin-tab:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.admin-tab.active {
    color: var(--primary-color);
    border-color: var(--primary-color);
    font-weight: 600;
}

.tab-icon {
    font-size: 1.2em;
}

.admin-tab-content {
    padding-top: 20px;
}

/* 搜索和筛选 */
.admin-search-bar {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.admin-search-input,
.admin-select {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}

/* 表格样式 */
.admin-table-container {
    overflow-x: auto;
    margin-top: 20px;
}

.admin-table {
    width: 100%;
    border-collapse: separate; /* 使用 separate 允许 border-spacing */
    border-spacing: 0 8px; /* 行间距 */
}

.admin-table th,
.admin-table td {
    padding: 12px 15px;
    text-align: left;
    vertical-align: middle;
}

.admin-table thead th {
    background-color: var(--light-bg);
    font-weight: 600;
    color: var(--subtle-text-color);
    border-bottom: 2px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1;
}

.admin-table tbody tr {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px; /* 圆角 */
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
    transition: all 0.2s ease-in-out;
}

.admin-table tbody tr:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.admin-table tbody td {
    border: none; /* 移除单元格边框 */
    border-top: 1px solid var(--border-color);
}

.admin-table tbody tr:first-child td {
    border-top: none;
}

.admin-table tbody tr td:first-child {
    border-top-left-radius: 8px;
    border-bottom-left-radius: 8px;
}

.admin-table tbody tr td:last-child {
    border-top-right-radius: 8px;
    border-bottom-right-radius: 8px;
}

.admin-table .short-link {
    font-weight: 500;
    color: var(--primary-color);
}

.admin-table .action-buttons .admin-btn {
    margin-right: 8px;
    padding: 6px 12px;
    font-size: 0.85rem;
}

.admin-btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.action-buttons {
    display: flex;
    gap: 8px;
    justify-content: center;
}

/* Pagination */
.admin-pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 2rem 0;
}

.admin-pagination .page-link {
    padding: 0.6rem 1.1rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.2s;
    background-color: var(--white);
}

.admin-pagination .page-link:hover {
    background-color: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-color: var(--primary-color);
}

.admin-pagination .page-link.active {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
    font-weight: 600;
}

/* Loading indicator */
.loading {
    text-align: center;
    padding: 20px;
    font-style: italic;
    color: var(--subtle-text-color);
}

/* Admin Modal */
.admin-modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1000; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgba(0, 0, 0, 0.4); /* Black w/ opacity */
    display: flex;
    align-items: center;
    justify-content: center;
}

.admin-modal-content {
    background-color: var(--white);
    margin: auto;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    position: relative;
    width: 90%;
    max-width: 600px;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.admin-close-button {
    color: var(--subtle-text-color);
    position: absolute;
    top: 15px;
    right: 25px;
    font-size: 30px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.2s;
}

.admin-close-button:hover,
.admin-close-button:focus {
    color: var(--danger-color);
    text-decoration: none;
    cursor: pointer;
}

/* Section Header with button */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h2 {
    margin-bottom: 0;
    border-bottom: none;
    padding-bottom: 0;
}

/* Responsive adjustments */
@media (max-width: 1200px) {
    .admin-container {
        margin: 15px;
        padding: 15px;
    }
}

@media (max-width: 992px) {
    .admin-stats {
        grid-template-columns: 1fr;
    }

    .admin-header-tabs {
        flex-wrap: wrap;
    }

    .admin-tab {
        flex: 1 1 auto;
        justify-content: center;
    }

    .admin-search-bar {
        flex-direction: column;
    }

    .admin-table thead {
        display: none;
    }

    .admin-table tbody tr {
        display: block;
        margin-bottom: 15px;
        border: 1px solid var(--border-color);
        border-radius: 8px;
        padding: 15px;
    }

    .admin-table tbody td {
        display: block;
        text-align: right;
        padding: 8px 0;
        border-bottom: 1px dashed var(--border-color);
    }

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

    .admin-table tbody td::before {
        content: attr(data-label);
        float: left;
        font-weight: 600;
        color: var(--text-color);
    }

    .admin-table .action-buttons {
        display: flex;
        justify-content: flex-end;
        gap: 8px;
        margin-top: 10px;
    }

    .admin-form {
        padding: 15px;
    }
}

@media (max-width: 576px) {
    .admin-layout {
        padding: 10px;
    }

    .admin-container {
        margin: 10px auto;
        padding: 10px;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .admin-h1 {
        font-size: 1.5em;
        text-align: center;
        margin-bottom: 15px;
    }

    .admin-btn {
        width: 100%;
        margin-bottom: 10px;
    }

    .admin-tab {
        font-size: 0.9rem;
        padding: 10px 15px;
    }

    .admin-form-actions {
        flex-direction: column;
    }

    .admin-pagination {
        flex-wrap: wrap;
        gap: 5px;
    }

    .admin-pagination .page-link {
        padding: 0.5rem 0.8rem;
        font-size: 0.9rem;
    }
}