/* ============================================
   TCM Learn - 专业学术风格
   ============================================ */

/* === Color Palette === */
:root {
    /* 主色 - 专业蓝 */
    --color-primary: #2563EB;
    --color-primary-dark: #1E40AF;
    --color-primary-light: #60A5FA;

    /* 辅助色 - 石板灰 */
    --color-secondary: #64748B;
    --color-secondary-light: #94A3B8;

    /* 背景色 - 纯净白 */
    --color-bg: #FFFFFF;
    --color-bg-light: #F8FAFC;
    --color-bg-white: #FFFFFF;
    --color-bg-gray: #F1F5F9;

    /* 文字色 */
    --color-text: #1E293B;
    --color-text-secondary: #64748B;
    --color-text-light: #94A3B8;
    --color-text-lighter: #CBD5E1;
    --color-text-primary: #0F172A;

    /* 功能色 */
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-info: #3B82F6;
    --color-warning: #F59E0B;

    /* 阴影 - 更柔和 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* === Reset & Base === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei UI", "微软雅黑", sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 1rem;
    line-height: 1.3;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

/* === Spacing System (6px base - more compact) === */
:root {
    --space-xs: 0.375rem;  /* 6px */
    --space-sm: 0.75rem;   /* 12px */
    --space-md: 1rem;      /* 16px */
    --space-lg: 1.25rem;   /* 20px */
    --space-xl: 1.75rem;   /* 28px */
    --space-xxl: 2.5rem;   /* 40px */

    /* Border Radius */
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.5rem;    /* 8px */
    --radius-lg: 0.75rem;   /* 12px */
    --radius-full: 9999px;  /* Fully rounded */
}

/* === Container === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* === Navigation === */
.navbar {
    background-color: var(--color-bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-border-light);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xs) var(--space-sm);
    gap: var(--space-md);
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-md);
    align-items: center;
}

.nav-links li a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    padding: var(--space-xs) var(--space-sm);
    border-radius: 6px;
    transition: all 0.2s;
}

.nav-links li a:hover {
    color: var(--color-primary);
    background-color: var(--color-bg);
}

.nav-links li a.active {
    color: var(--color-primary);
    background-color: var(--color-bg);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding-left: var(--space-sm);
    border-left: 1px solid var(--color-border-light);
}

.nav-user span {
    font-weight: 500;
    color: var(--color-text);
}

/* === Search Bar === */
.nav-search {
    flex: 1;
    max-width: 480px;
    margin: 0 var(--space-lg);
}

.search-form {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.search-input {
    flex: 1;
    padding: 0.625rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.9375rem;
    transition: all 0.2s;
    background-color: var(--color-bg-light);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(124, 179, 66, 0.1);
    background-color: var(--color-bg-white);
}

.search-button {
    padding: 0.625rem 1rem;
    background-color: var(--color-primary);
    color: var(--color-bg-white);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
}

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

/* === Mobile Search Icon === */
.search-icon-mobile {
    display: none;
    color: var(--color-text);
    font-size: 1.5rem;
    padding: 0.5rem;
    transition: color 0.2s;
}

.search-icon-mobile:hover {
    color: var(--color-primary);
}

/* Desktop: Show full search form, hide mobile search icon nav item */
@media (min-width: 769px) {
    .nav-search-desktop {
        display: block;
    }

    .nav-item-mobile {
        display: none;
    }

    .nav-text-mobile {
        display: none;
    }
}

/* === Mobile Dropdown Menu === */
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.2s ease-out;
}

.mobile-menu-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 70vh;
    background-color: var(--color-bg-white);
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
    animation: slideInUp 0.3s ease-out;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem 0.75rem;
    border-bottom: 1px solid var(--color-border);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

.mobile-menu-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.mobile-menu-close:hover {
    color: var(--color-text);
}

.mobile-menu-items {
    padding: 0.75rem 1.25rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    overflow-y: auto;
}

.mobile-menu-item {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 0.875rem 1rem;
    background: none;
    border: none;
    border-radius: 12px;
    text-decoration: none;
    color: var(--color-text);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    text-align: left;
}

.mobile-menu-item:hover {
    background-color: var(--color-bg-light);
}

.mobile-menu-item i {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    width: 1.5rem;
    text-align: center;
}

.mobile-menu-toggle {
    background: none;
    border: none;
    color: var(--color-text);
    font-size: 1.5rem;
    padding: 0.5rem;
    cursor: pointer;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-menu-toggle:hover {
    color: var(--color-primary);
}

@keyframes slideInUp {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

/* === Main Content === */
.main-content {
    flex: 1;
    padding: var(--space-md) 0;
}

/* === Cards === */
.card {
    background-color: var(--color-bg-white);
    border-radius: 12px;
    padding: var(--space-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-sm);
    border: 1px solid var(--color-border-light);
}

.card h2 {
    margin-top: 0;
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border-light);
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-md);
    border: none;
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    gap: var(--space-xs);
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: var(--color-bg-white);
}

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

.btn-danger:hover {
    background-color: #E53935;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

/* === Forms === */
.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 500;
    color: var(--color-text);
    font-size: 0.9375rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s;
    background-color: var(--color-bg-white);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(124, 179, 66, 0.1);
}

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

/* === Flash Messages === */
.flash-messages {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-md);
    z-index: 1000;
    max-width: 380px;
    pointer-events: none;
}

.flash {
    pointer-events: auto;
    padding: var(--space-sm) var(--space-md);
    margin-bottom: var(--space-xs);
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

.flash-success {
    background-color: rgba(102, 187, 106, 0.95);
    color: white;
    border-left: 3px solid #4CAF50;
}

.flash-danger {
    background-color: rgba(239, 83, 80, 0.95);
    color: white;
    border-left: 3px solid #F44336;
}

.flash-info {
    background-color: rgba(66, 165, 245, 0.95);
    color: white;
    border-left: 3px solid #2196F3;
}

.flash-warning {
    background-color: rgba(255, 167, 38, 0.95);
    color: white;
    border-left: 3px solid #FF9800;
}

.flash-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: white;
    opacity: 0.8;
    transition: opacity 0.2s;
    line-height: 1;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.flash-close:hover {
    opacity: 1;
    background-color: rgba(255, 255, 255, 0.2);
}
}

.flash-close:hover {
    opacity: 1;
}

/* === Footer === */
.footer {
    background-color: var(--color-bg-white);
    border-top: 1px solid var(--color-border-light);
    padding: var(--space-sm) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.compliance-notice {
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 4px;
}

.compliance-notice::before {
    content: '⚠️';
    font-size: 0.875rem;
}

.copyright {
    color: var(--color-text-light);
    font-size: 0.75rem;
}

.icp-info {
    font-size: 0.75rem;
}

.icp-info a {
    color: var(--color-text-light);
    text-decoration: none;
    transition: color 0.2s ease;
}

.icp-info a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* === Auth Pages === */
.auth-container {
    max-width: 480px;
    margin: var(--space-xxl) auto;
}

.auth-card {
    background-color: var(--color-bg-white);
    border-radius: 12px;
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
}

.auth-card h1 {
    text-align: center;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

.auth-card p {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.auth-footer {
    text-align: center;
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-light);
}

/* === Helper Classes === */
.text-muted {
    color: var(--color-text-light);
}

.text-center {
    text-align: center;
}

.form-text {
    display: block;
    margin-top: var(--space-xs);
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* === Admin Styles === */
.admin-layout {
    max-width: 1200px;
    margin: 0 auto;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.admin-nav {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.admin-nav .btn {
    flex: 1;
    min-width: 120px;
    text-align: center;
}

.admin-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.admin-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    border: 1px solid var(--color-border-light);
    border-radius: 8px;
    background-color: var(--color-bg-white);
    transition: box-shadow 0.2s;
}

.admin-list-item:hover {
    box-shadow: var(--shadow-sm);
}

.item-info {
    flex: 1;
}

.item-info strong {
    display: block;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
    font-size: 1rem;
}

.item-info p {
    margin: var(--space-xs) 0;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.item-meta {
    display: inline-block;
    margin-right: var(--space-md);
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.item-actions {
    display: flex;
    gap: var(--space-xs);
    align-items: center;
}

.badge-role {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-primary);
    color: var(--color-bg-white);
    border-radius: 12px;
    font-size: 0.8125rem;
    font-weight: 500;
}

/* === Stats Grid === */
.stats-grid {
    display: flex;
    flex-wrap: nowrap; /* 强制不换行 */
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    /* 确保每个卡片占据一半空间，考虑gap */
    box-sizing: border-box;
}

.stat-card {
    background-color: var(--color-bg-white);
    border-radius: 8px;
    padding: var(--space-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    /* 强制均分空间，不允许收缩或增长 */
    flex: 1 1 0;
    min-width: 0; /* 允许内容收缩 */
    overflow: hidden;
    box-sizing: border-box;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--space-xs);
    /* 防止数字过大导致溢出 */
    word-break: break-word;
    overflow-wrap: break-word;
}

.stat-label {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    /* 防止文字过长导致溢出 */
    word-break: keep-all;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* === Utility === */
.checkbox label {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    cursor: pointer;
}

.checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* === Responsive === */
@media (max-width: 768px) {
    .navbar .container {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0;
        padding-top: var(--space-xs);
        padding-bottom: var(--space-xs);
    }

    .nav-brand {
        width: 100%;
        text-align: center;
        margin: 0;
        padding: 0;
        line-height: 1.2;
    }

    .nav-brand a {
        padding: 0;
        margin: 0;
    }

    .nav-links {
        flex-wrap: nowrap;
        gap: var(--space-sm);
        justify-content: center;
        width: 100%;
        margin: 0;
        padding: 0;
    }

    /* Hide desktop items, show mobile items */
    .nav-item-desktop {
        display: none;
    }

    .nav-item-mobile {
        display: block;
    }

    .nav-text-mobile {
        display: inline;
        font-size: 0.875rem;
    }

    .nav-item-mobile .nav-link {
        font-size: 0.875rem;
        padding: var(--space-xs) calc(var(--space-sm) * 0.75);
    }

    .nav-search-desktop {
        display: none;
    }
}

/* 中小屏幕优化：确保统计卡片在一行 */
@media (max-width: 450px) {
    .stats-grid {
        gap: 8px;
    }

    .stat-card {
        padding: 10px;
    }

    .stat-value {
        font-size: 1.75rem;
    }

    .stat-label {
        font-size: 0.8125rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .nav-links {
        font-size: 0.875rem;
    }

    /* 统计卡片 - 调整间距和字体大小 */
    .stats-grid {
        gap: var(--space-sm);
    }

    .stat-card {
        padding: var(--space-sm);
    }

    /* 优化统计数值字体大小 */
    .stat-value {
        font-size: 2rem !important;
    }

    .stat-label {
        font-size: 0.8125rem !important;
    }
}

/* === Dashboard Specific === */
.dashboard-header {
    margin-bottom: var(--space-xl);
}

.dashboard-section {
    margin-bottom: var(--space-xl);
}

.dashboard-section > h2 {
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* === Badges Grid === */
.badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-md);
}

.badge-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: var(--color-bg-light);
    border-radius: 8px;
    border: 1px solid var(--color-border-light);
}

.badge-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.badge-info {
    flex: 1;
}

.badge-name {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.badge-desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* === Card Lists === */
.card-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-md);
}

.card-item {
    background-color: var(--color-bg-white);
    border-radius: 12px;
    padding: var(--space-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    transition: all 0.2s;
    cursor: pointer;
}

.card-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-item-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.card-item-desc {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-item-meta {
    display: flex;
    gap: var(--space-md);
    font-size: 0.875rem;
    color: var(--color-text-light);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border-light);
}

/* === Action Cards === */
.action-card {
    background-color: var(--color-bg-white);
    border-radius: 12px;
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
}

.action-card .btn {
    width: 100%;
    margin-bottom: var(--space-sm);
}

.action-card .btn:last-child {
    margin-bottom: 0;
}

/* === Study Session === */
.study-container {
    max-width: 800px;
    margin: 0 auto;
}

.study-card {
    background-color: var(--color-bg-white);
    border-radius: 12px;
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

.study-card-front,
.study-card-back {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.study-content {
    font-size: 1.5rem;
    line-height: 1.6;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

.study-extra {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-md);
}

.study-actions {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-rating {
    padding: 0.75rem 2rem;
    font-size: 1rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-rating[data-rating="0"] {
    background-color: var(--color-danger);
    color: var(--color-bg-white);
}

.btn-rating[data-rating="3"] {
    background-color: var(--color-warning);
    color: var(--color-bg-white);
}

.btn-rating[data-rating="4"] {
    background-color: var(--color-info);
    color: var(--color-bg-white);
}

.btn-rating[data-rating="5"] {
    background-color: var(--color-success);
    color: var(--color-bg-white);
}

.btn-rating:hover {
    transform: scale(1.05);
}

/* === Empty States === */
.empty-state {
    text-align: center;
    padding: var(--space-xxl) var(--space-lg);
    background-color: var(--color-bg-white);
    border-radius: 12px;
    border: 1px dashed var(--color-border);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.empty-state-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.empty-state-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

/* === Post Styles === */
.post-item {
    background-color: var(--color-bg-white);
    border-radius: 12px;
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    margin-bottom: var(--space-md);
}

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

.post-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.post-meta {
    display: flex;
    gap: var(--space-md);
    font-size: 0.875rem;
    color: var(--color-text-light);
    align-items: center;
}

.post-content {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-bg);
    color: var(--color-primary);
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

.post-actions {
    display: flex;
    gap: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-light);
}

/* === Comments === */
.comment-item {
    padding: var(--space-md);
    background-color: var(--color-bg-light);
    border-radius: 8px;
    margin-bottom: var(--space-sm);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-xs);
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.comment-author {
    font-weight: 600;
    color: var(--color-text);
}

/* === Loaders & Spinners === */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* === Animations === */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* === Visibility === */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

/* === Print Styles === */
@media print {
    .navbar,
    .footer,
    .btn,
    .flash-messages {
        display: none !important;
    }
    
    .main-content {
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--color-border);
    }
}

/* === Secondary Navigation === */
.secondary-nav {
    background-color: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.secondary-nav .container {
    padding: 0 var(--space-md);
}

.secondary-nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
}

.secondary-nav-links li {
    display: flex;
    align-items: center;
}

.secondary-nav-links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s;
}

.secondary-nav-links a:hover {
    color: var(--color-primary);
    background-color: var(--color-bg);
}

.secondary-nav-links a.active {
    color: var(--color-primary);
    background-color: var(--color-bg);
}

.secondary-nav-links .separator {
    color: var(--color-border);
    font-size: 1rem;
    margin: 0 var(--space-xs);
}

/* === Nav Item with Dropdown (future use) === */
.nav-item {
    position: relative;
}

.nav-link {
    position: relative;
    display: flex;
    align-items: center;
}

/* === Nav Link Active State Indicator === */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width 0.2s;
}

.nav-link.active::after {
    width: 100%;
}

/* === Responsive Enhancements === */
@media (max-width: 768px) {
    .nav-links {
        gap: var(--space-sm);
    }

    .nav-link {
        font-size: 0.875rem;
    }

    .secondary-nav-links {
        flex-wrap: wrap;
    }

    .secondary-nav-links .separator {
        display: none;
    }

    .secondary-nav-links li {
        flex-shrink: 0;
    }
}

/* === Dropdown Menu === */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-xs) var(--space-sm);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 4px;
}

.dropdown-toggle:hover {
    background: var(--color-bg-gray);
    color: var(--color-text-primary);
    border-color: var(--color-primary);
}

/* Dropdown toggle with button style */
.dropdown-toggle.btn {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.dropdown-toggle.btn:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: white;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width: 160px;
    z-index: 100;
    display: none;
    animation: fadeIn 0.2s ease;
}

.dropdown.show .dropdown-menu {
    display: block;
}

.dropdown-menu a,
.dropdown-menu button {
    display: block;
    width: 100%;
    padding: var(--space-xs) var(--space-sm);
    border: none;
    background: none;
    text-align: left;
    font-size: 0.875rem;
    color: var(--color-text-primary);
    text-decoration: none;
    transition: background 0.2s;
    cursor: pointer;
}

.dropdown-menu a:hover,
.dropdown-menu button:hover {
    background: var(--color-bg-gray);
}

.dropdown-menu .dropdown-divider {
    height: 1px;
    background: var(--color-border-light);
    margin: var(--space-xs) 0;
}

.dropdown-menu .dropdown-item-danger {
    color: var(--color-danger);
}

.dropdown-menu .dropdown-item-danger:hover {
    background: rgba(239, 83, 80, 0.1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* === Icon Buttons === */
.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 4px 8px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: white;
    color: var(--color-text-secondary);
    font-size: 0.8125rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: var(--color-bg-gray);
    color: var(--color-text-primary);
    border-color: var(--color-primary);
}

.icon-btn.danger {
    color: var(--color-danger);
    border-color: rgba(239, 83, 80, 0.3);
}

.icon-btn.danger:hover {
    background: rgba(239, 83, 80, 0.1);
    border-color: var(--color-danger);
}

.icon-btn.edit {
    color: #FFA726;
    border-color: rgba(255, 167, 38, 0.3);
}

.icon-btn.edit:hover {
    background: rgba(255, 167, 38, 0.1);
    border-color: #FFA726;
}

/* === Breadcrumb Navigation === */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) 0;
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
    flex-wrap: wrap;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-text-secondary);
}

.breadcrumb-item a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.breadcrumb-item a:hover {
    color: var(--color-primary);
}

.breadcrumb-item.active {
    color: var(--color-text-primary);
    font-weight: 500;
}

.breadcrumb-separator {
    color: var(--color-text-tertiary);
    font-size: 0.75rem;
}

/* === Folder Structure === */
.folder-tree {
    margin-bottom: var(--space-lg);
}

.folder-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background 0.2s;
    margin-bottom: var(--space-xs);
}

.folder-item:hover {
    background: var(--color-bg-gray);
}

.folder-item.active {
    background: rgba(124, 179, 66, 0.1);
    color: var(--color-primary);
}

.folder-icon {
    color: #FFA726;
}

.folder-children {
    margin-left: var(--space-lg);
    padding-left: var(--space-sm);
    border-left: 2px solid var(--color-border-light);
}

.folder-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm);
    background: var(--color-bg-gray);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
}

.folder-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    color: var(--color-text-primary);
}

.folder-stats {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

/* === Unified Card Design (Modern Minimalist) === */

/* Base card styles */
.folder-card,
.deck-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--space-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    position: relative;
    border: 1px solid var(--color-border-light);
    min-height: 280px; /* 增加最小高度 */
}

/* 响应式卡片padding */
@media (min-width: 768px) {
    .folder-card,
    .deck-card {
        padding: calc(var(--space-lg) * 1.25);
        min-height: 320px;
    }
}

@media (min-width: 1024px) {
    .folder-card,
    .deck-card {
        padding: var(--space-xl);
        min-height: 360px;
    }
}

.folder-card:hover,
.deck-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px) scale(1.02);
    border-color: var(--color-primary);
}

/* Enhanced hover effect for better visual feedback */
.folder-card,
.deck-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.folder-card:hover,
.deck-card:hover {
    background: linear-gradient(135deg, #ffffff 0%, #f8fdf8 100%);
}

/* Remove default link styling for cards */
.folder-card,
.deck-card {
    text-decoration: none;
    color: inherit;
}

.folder-card:hover,
.deck-card:hover {
    text-decoration: none;
}

/* Card headers */
.folder-card h3,
.deck-card h3 {
    margin: 0 0 var(--space-md) 0;
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding-right: 70px; /* Space for badge */
    line-height: 1.4;
}

.folder-card .folder-icon,
.deck-card .deck-icon {
    font-size: 1.5rem;
    line-height: 1;
}

/* Descriptions */
.folder-description,
.deck-description {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: var(--space-lg);
    min-height: 0; /* 防止flex子元素撑开容器 */
}

/* Progress bars */
.deck-progress {
    margin-bottom: var(--space-md);
}

.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
    font-weight: 500;
}

.progress-track {
    background: var(--color-bg-gray);
    height: 8px;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    transition: width 0.3s ease;
    border-radius: var(--radius-full);
}

.progress-fill.mastered {
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
}

.progress-fill.learning {
    background: linear-gradient(90deg, #FFA726, #FFCC80);
}

.progress-fill.new {
    background: linear-gradient(90deg, #90A4AE, #B0BEC5);
}

/* Statistics */
.folder-stats-info,
.deck-stats {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    flex-wrap: wrap;
}

.folder-stat,
.deck-stat {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg-gray);
    border-radius: var(--radius-md);
}

.folder-stat-value,
.deck-stat-value {
    font-weight: 700;
    color: var(--color-text-primary);
    font-size: 1.125rem;
}

/* Meta information */
.deck-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    padding: var(--space-sm) 0;
    border-top: 1px solid var(--color-border-light);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* Tags */
.deck-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.deck-tag {
    background: var(--color-bg-gray);
    color: var(--color-text-secondary);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
}

/* Badges */
.folder-badge,
.due-badge {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    box-shadow: var(--shadow-sm);
    z-index: 1;
}

.folder-badge {
    background: linear-gradient(135deg, #FFF3E0, #FFE0B2);
    color: #F57C00;
}

.due-badge {
    background: linear-gradient(135deg, #FFEBEE, #FFCDD2);
    color: #D32F2F;
}

/* Visibility indicator */
.deck-visibility {
    position: absolute;
    bottom: var(--space-md);
    right: var(--space-md);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-gray);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-weight: 500;
}

/* === 智能显示：根据卡片内容自动调整 === */

/* 当统计项超过3个时，隐藏元信息以减少拥挤 */
@media (max-width: 1024px) {
    .deck-card:has(.deck-stats:has(.deck-stat:nth-child(4))) .deck-meta {
        display: none;
    }
}

/* 当统计项超过4个时，隐藏标签 */
@media (max-width: 768px) {
    .deck-card:has(.deck-stats:has(.deck-stat:nth-child(n+5))) .deck-tags {
        display: none;
    }
}

/* 小屏幕上隐藏部分元信息项 */
@media (max-width: 768px) {
    .deck-meta .meta-item:nth-child(n+3) {
        display: none;
    }
}

/* 进度条空的时候隐藏 */
.deck-progress:not(:has(.progress-fill[style*="width: 0%"])) {
    display: block;
}

/* 没有卡片时隐藏进度条 */
.deck-stats:has(.deck-stat-value:empty) + .deck-progress {
    display: none;
}

/* Actions removed for minimal design - users click to view details */

/* Grid Layout - 响应式自适应 */
.deck-grid {
    display: grid;
    gap: var(--space-xl);
    /* 默认移动端：1列 */
    grid-template-columns: 1fr;
}

/* 平板尺寸：2列 */
@media (min-width: 768px) {
    .deck-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: calc(var(--space-xl) * 1.5);
    }
}

/* 小型笔记本：3列 */
@media (min-width: 1024px) {
    .deck-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 大屏幕：4列 */
@media (min-width: 1440px) {
    .deck-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: calc(var(--space-xl) * 2);
    }
}

/* 超宽屏：最多5列，限制最大宽度 */
@media (min-width: 1920px) {
    .deck-grid {
        grid-template-columns: repeat(5, 1fr);
        max-width: 1800px;
        margin: 0 auto;
    }
}

/* ========================================
   卡片详情页 - 卡片列表样式
   ======================================== */

/* 卡片列表头部 */
.deck-cards-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--color-border-light);
}

.deck-cards-header h2 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--color-text-primary);
}

.deck-cards-actions {
    display: flex;
    gap: var(--space-sm);
}

/* 卡片列表容器 */
.cards-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* 单个卡片项 */
.card-item {
    background: white;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

.card-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.card-item.expanded {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

/* 卡片主要内容区 */
.card-item-main {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: var(--space-md);
    padding: var(--space-lg);
    align-items: start;
}

/* 卡片题面区 */
.card-item-front {
    display: flex;
    gap: var(--space-md);
    align-items: start;
    min-width: 0;
}

.card-item-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    color: white;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
}

.card-item-content {
    flex: 1;
    min-width: 0;
}

.card-item-title {
    margin: 0 0 var(--space-sm) 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 扩展信息预览 */
.card-item-extra-preview {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-sm);
}

.extra-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    background: var(--color-bg-gray);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.extra-tag strong {
    color: var(--color-text-primary);
    margin-right: 0.25rem;
}

.extra-more {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

/* 卡片元信息 */
.card-item-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    align-items: end;
    padding: var(--space-sm);
    background: var(--color-bg-gray);
    border-radius: var(--radius-md);
    min-width: 120px;
}

.card-date {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.8125rem;
    color: var(--color-text-light);
}

.card-date i {
    font-size: 1rem;
}

/* 卡片操作按钮 */
.card-item-actions {
    display: flex;
    gap: var(--space-xs);
    align-items: center;
}

/* 卡片展开图标 */
.card-item-expand {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    color: var(--color-text-light);
}

.card-item-expand:hover {
    background: var(--color-bg-gray);
    color: var(--color-primary);
}

.card-item-expand .expand-icon {
    font-size: 1.25rem;
    transition: transform 0.3s ease;
}

/* 卡片答案区 */
.card-item-back {
    border-top: 1px solid var(--color-border-light);
    background: var(--color-bg-light);
    padding: var(--space-lg);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card-back-content h4 {
    margin: 0 0 var(--space-sm) 0;
    font-size: 1rem;
    color: var(--color-text-secondary);
}

.card-back-content > p {
    margin: 0 0 var(--space-md) 0;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-primary);
}

/* 扩展信息详情 */
.card-back-extra {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-light);
}

.card-back-extra h5 {
    margin: 0 0 var(--space-sm) 0;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.extra-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--space-sm);
    width: 100%;
}

.extra-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: var(--space-sm);
    background: white;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border-light);
}

.extra-key {
    font-size: 0.75rem;
    color: var(--color-text-light);
    font-weight: 500;
}

.extra-value {
    font-size: 0.875rem;
    color: var(--color-text-primary);
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: pre-wrap;
    line-height: 1.5;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: var(--space-xxl) var(--space-lg);
}

.empty-state h3 {
    margin: var(--space-md) 0 var(--space-sm) 0;
    font-size: 1.25rem;
    color: var(--color-text-primary);
}

.empty-state p {
    margin: 0 0 var(--space-lg) 0;
    color: var(--color-text-light);
}

/* 响应式设计 */

/* 平板设备 */
@media (max-width: 768px) {
    .card-item-main {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }

    .card-item-front {
        gap: var(--space-sm);
    }

    .card-item-meta {
        flex-direction: row;
        align-items: center;
        width: 100%;
    }

    .card-item-actions {
        justify-content: start;
    }

    .extra-grid {
        grid-template-columns: 1fr;
    }
}

/* 手机设备 */
@media (max-width: 480px) {
    .deck-cards-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .card-item-main {
        padding: var(--space-md);
    }

    .card-item-icon {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    .card-item-title {
        font-size: 1rem;
    }

    .card-item-actions .btn {
        padding: 0.375rem 0.75rem;
        font-size: 0.8125rem;
    }
}

/* ========================================
   卡片操作按钮优化样式
   ======================================== */

/* 排序控件 */
.sort-controls {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-right: var(--space-md);
}

.sort-controls label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.sort-select {
    padding: 0.5rem 2rem 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background-color: var(--color-bg-white);
    color: var(--color-text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    transition: all 0.2s ease;
}

.sort-select:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg-light);
}

.sort-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* 卡片项可点击效果 */
.card-item {
    cursor: pointer;
    position: relative;
}

.card-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(124, 179, 66, 0.05) 0%, rgba(141, 110, 99, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 0;
}

.card-item:hover::before {
    opacity: 1;
}

.card-item-main {
    position: relative;
    z-index: 1;
}

/* 卡片操作按钮区域 */
.card-item-actions {
    display: flex;
    gap: var(--space-xs);
    align-items: center;
}

.card-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--color-bg-gray);
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.card-action-btn:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
    transform: scale(1.1);
}

.edit-btn {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    color: white;
}

.edit-btn:hover {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(124, 179, 66, 0.3);
}

.more-btn {
    background: var(--color-bg-gray);
    color: var(--color-text-secondary);
}

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

/* 卡片操作下拉菜单 */
.card-action-dropdown {
    position: relative;
}

.card-action-menu {
    display: none;
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 160px;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    overflow: visible;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.action-menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    padding: 0.75rem 1rem;
    border: none;
    background: none;
    color: var(--color-text-primary);
    font-size: 0.875rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-menu-item:hover {
    background: var(--color-bg-light);
    color: var(--color-primary);
}

.action-menu-item i {
    font-size: 1rem;
}

.action-menu-item.text-danger {
    color: var(--color-danger);
}

.action-menu-item.text-danger:hover {
    background: #fff5f5;
    color: #dc2626;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .sort-controls {
        width: 100%;
        margin-bottom: var(--space-sm);
    }

    .sort-select {
        flex: 1;
    }

    .card-action-btn {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }
}

/* ========================================
   修复卡片下拉菜单显示问题
   ======================================== */

/* 确保卡片不会裁剪下拉菜单 */
.card-item {
    overflow: visible !important;
}

/* 卡片内容区域可以隐藏overflow，但不影响菜单 */
.card-item-main {
    overflow: visible;
}

/* 确保所有子元素不会裁剪下拉菜单 */
.card-item-front {
    overflow: visible !important;
}

.card-item-content {
    overflow: visible !important;
}

.card-item-actions {
    overflow: visible !important;
}

.card-action-dropdown {
    overflow: visible !important;
}

/* 增强下拉菜单的可见性 */
.card-action-menu {
    display: none;
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 180px;
    background: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    overflow: visible;
    animation: menuSlideIn 0.2s ease;
}

@keyframes menuSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.action-menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    padding: 0.875rem 1rem;
    border: none;
    background: white;
    color: var(--color-text-primary);
    font-size: 0.9375rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 1px solid var(--color-border-light);
}

.action-menu-item:last-child {
    border-bottom: none;
}

.action-menu-item:hover {
    background: linear-gradient(135deg, #f8fdf8 0%, #f0f9f0 100%);
    color: var(--color-primary);
    padding-left: 1.25rem;
}

.action-menu-item i {
    font-size: 1.125rem;
    width: 20px;
    text-align: center;
}

.action-menu-item.text-danger {
    color: #dc2626;
}

.action-menu-item.text-danger:hover {
    background: linear-gradient(135deg, #fff5f5 0%, #fed7d7 100%);
    color: #b91c1c;
}

/* 更强明显的更多操作按钮 */
.more-btn {
    background: linear-gradient(135deg, var(--color-bg-gray) 0%, var(--color-bg-dark) 100%);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
    transition: all 0.2s ease;
}

.more-btn:hover {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    color: white;
    border-color: var(--color-primary);
    transform: scale(1.1);
}

/* 点击效果 */
.more-btn:active {
    transform: scale(0.95);
}

/* ========================================
   修复下拉菜单被其他卡片遮挡的问题
   ======================================== */

/* 基础卡片层级 */
.card-item {
    position: relative;
    z-index: 1;
}

/* 当菜单显示时，提升当前卡片的层级（使用 .menu-active 类，兼容性更好） */
/* 注意：已删除 :has() 选择器，改用 .menu-active 类实现相同功能 */

/* 确保下拉菜单在所有内容之上 */
.card-action-menu {
    z-index: 1001 !important;
}

/* 卡片列表容器也要允许溢出 */
.cards-list {
    overflow: visible;
}

/* 确保卡片容器也不裁剪 */
.card {
    overflow: visible;
}

/* 当菜单激活时，提升卡片层级（JavaScript方式） */
.card-item.menu-active {
    z-index: 100 !important;
}

/* 菜单激活时卡片也增加阴影效果 */
.card-item.menu-active {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* 确保菜单激活状态下的过渡效果 */
.card-item {
    transition: box-shadow 0.3s ease;
}

/* ========================================
   移动端卡片布局优化
   ======================================== */

/* 手机设备优化 */
@media (max-width: 480px) {
    /* 卡片整体更紧凑 */
    .card-item-main {
        padding: var(--space-sm) var(--space-md);
        gap: var(--space-sm);
    }

    .card-item-front {
        gap: var(--space-sm);
    }

    /* 图标更小 */
    .card-item-icon {
        width: 32px;
        height: 32px;
        font-size: 1rem;
        flex-shrink: 0;
    }

    /* 标题字体调整 */
    .card-item-title {
        font-size: 0.9375rem;
        line-height: 1.4;
        margin-bottom: 0;
    }

    /* 元信息区域调整 */
    .card-item-meta {
        padding: var(--space-xs);
        min-width: auto;
        align-self: flex-start;
    }

    .card-date {
        font-size: 0.75rem;
    }

    /* 移动端按钮布局优化 - 移到右上角 */
    .card-item-main {
        display: grid;
        grid-template-columns: 1fr auto;
        grid-template-rows: auto auto;
        gap: var(--space-xs);
    }

    .card-item-front {
        grid-column: 1 / 2;
        grid-row: 1 / 2;
    }

    .card-item-actions {
        grid-column: 2 / 3;
        grid-row: 1 / 2;
        justify-content: flex-end;
    }

    .card-item-meta {
        grid-column: 1 / 3;
        grid-row: 2 / 3;
        justify-content: flex-start;
        width: 100%;
        background: transparent;
        padding: 0;
    }

    /* 按钮尺寸 */
    .card-action-btn {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    /* 答案区域更紧凑 */
    .card-item-back {
        padding: var(--space-md);
    }

    .card-back-content h4 {
        font-size: 0.875rem;
        margin-bottom: var(--space-xs);
    }

    .card-back-content > p {
        font-size: 0.9375rem;
        margin-bottom: var(--space-sm);
    }

    /* 扩展信息网格调整为单列 */
    .extra-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xs);
    }

    .extra-item {
        padding: var(--space-xs);
    }

    .extra-key {
        font-size: 0.6875rem;
    }

    .extra-value {
        font-size: 0.8125rem;
    }

    /* 卡片列表间距缩小 */
    .cards-list {
        gap: var(--space-sm);
    }
}

/* 超小屏幕（小于360px）进一步优化 */
@media (max-width: 360px) {
    .card-item-main {
        padding: var(--space-xs) var(--space-sm);
    }

    /* 统计卡片优化 */
    .stats-grid {
        gap: var(--space-xs);
    }

    .stat-card {
        padding: var(--space-xs);
        min-width: 0;
        overflow: hidden;
    }

    .stat-value {
        font-size: 1.5rem !important;
        word-break: break-word;
    }

    .stat-label {
        font-size: 0.75rem !important;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
    }

    .card-item-icon {
        width: 28px;
        height: 28px;
        font-size: 0.875rem;
    }

    .card-item-title {
        font-size: 0.875rem;
    }

    .card-action-btn {
        width: 28px;
        height: 28px;
        font-size: 0.875rem;
    }

    .card-date {
        font-size: 0.6875rem;
    }
}

/* ========================================
   统一的操作按钮和下拉菜单样式
   ======================================== */

/* 统一的下拉菜单基础样式 */
.dropdown-menu,
.card-action-menu {
    display: none;
    min-width: 200px;
    background: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.05);
    z-index: 1001;
    overflow: visible;
    animation: menuSlideIn 0.2s ease;
}

/* 卡片组操作菜单特定样式 */
.card-header .card-action-dropdown {
    position: relative;
}

.card-header .dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
}

/* 统一的菜单项样式 */
.action-menu-item,
.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    padding: 0.875rem 1rem;
    border: none;
    background: white;
    color: var(--color-text-primary);
    font-size: 0.9375rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 1px solid var(--color-border-light);
}

.action-menu-item:last-child,
.dropdown-menu a:last-child {
    border-bottom: none;
}

.action-menu-item:hover,
.dropdown-menu a:hover {
    background: linear-gradient(135deg, #f8fdf8 0%, #f0f9f0 100%);
    color: var(--color-primary);
    padding-left: 1.25rem;
}

.action-menu-item i,
.dropdown-menu a i {
    font-size: 1.125rem;
    width: 20px;
    text-align: center;
}

/* 菜单分隔线 */
.dropdown-divider {
    height: 1px;
    background: var(--color-border-light);
    margin: 0;
}

/* 移动文件夹选择框样式 */
.action-select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-white);
    color: var(--color-text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-select:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-light);
}

.action-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* 确保按钮文字颜色一致 */
.card-header .more-btn {
    color: var(--color-text-primary);
}

/* ========================================
   修复操作按钮和下拉菜单问题
   ======================================== */

/* 统一的操作按钮样式 - 圆形按钮 */
.card-action-btn {
    width: 36px !important;
    height: 36px !important;
    border-radius: 50% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    border: 2px solid var(--color-border) !important;
    background: linear-gradient(135deg, var(--color-bg-gray) 0%, var(--color-bg-dark) 100%) !important;
    color: var(--color-text-primary) !important;
    font-size: 1.125rem !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    padding: 0 !important;
    text-decoration: none !important;
}

.card-action-btn:hover {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%) !important;
    color: white !important;
    border-color: var(--color-primary) !important;
    transform: scale(1.1);
}

.card-action-btn:active {
    transform: scale(0.95);
}

/* 卡片组头部操作按钮容器 */
.card-header .card-action-dropdown {
    display: inline-block;
    vertical-align: middle;
}

/* 确保卡片组头部操作按钮不换行 */
.card-header .header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* 下拉菜单正确定位 */
.card-header .dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 200px;
    z-index: 1002;
}

/* 卡片操作菜单定位 */
.card-item-actions .card-action-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 160px;
    z-index: 1002;
}

/* 移除之前冲突的样式 */
.card-header .more-btn {
    all: initial;
    width: 36px !important;
    height: 36px !important;
    border-radius: 50% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    border: 2px solid var(--color-border) !important;
    background: linear-gradient(135deg, var(--color-bg-gray) 0%, var(--color-bg-dark) 100%) !important;
    color: var(--color-text-primary) !important;
    font-size: 1.125rem !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
}

/* ========================================
   卡片组头部布局修复
   ======================================== */

.card-header {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.card-header > h1 {
    margin: 0;
}

.header-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm);
}

.header-actions .btn {
    flex-shrink: 0;
}

/* 确保操作按钮容器不换行 */
.header-actions > .card-action-dropdown {
    flex-shrink: 0;
}

/* 移动端优化 */
@media (max-width: 768px) {
    .header-actions {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
    }

    .header-actions .btn,
    .header-actions .card-action-dropdown {
        width: 100%;
    }

    .header-actions .card-action-btn {
        width: 100% !important;
        border-radius: var(--radius-sm) !important;
        height: 40px !important;
    }
}

/* ========================================
   纯图标按钮样式
   ======================================== */

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    padding: 0;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-icon i {
    font-size: 1.5rem;
    line-height: 1;
}

.btn-icon.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border: none;
}

.btn-icon.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(124, 179, 66, 0.4);
}

.btn-icon.btn-primary:active {
    transform: scale(0.95);
}

/* 移动端优化 */
@media (max-width: 768px) {
    .btn-icon {
        width: 36px;
        height: 36px;
    }

    .btn-icon i {
        font-size: 1.25rem;
    }
}

/* ========================================
   优化卡片组头部布局
   ======================================== */

.card-header {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

@media (min-width: 768px) {
    .card-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
        gap: var(--space-lg);
    }

    .card-header > h1 {
        flex: 1;
        margin: 0;
        min-width: 0;
    }

    .card-header .header-actions {
        display: flex;
        align-items: center;
        gap: var(--space-sm);
        flex-shrink: 0;
    }

    .card-header .header-actions .btn-icon,
    .card-header .header-actions .card-action-btn {
        flex-shrink: 0;
    }
}

/* 移动端优化 - 保持紧凑的单行布局 */
@media (max-width: 767px) {
    .card-header {
        display: flex;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: var(--space-sm);
        padding: var(--space-md) 0;
    }

    .card-header > h1 {
        flex: 1;
        margin: 0;
        font-size: 1.25rem;
        line-height: 1.2;
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .card-header .header-actions {
        display: flex;
        align-items: center;
        gap: var(--space-xs);
        flex-shrink: 0;
    }

    .card-header .header-actions .btn-icon,
    .card-header .header-actions .card-action-btn {
        width: 32px !important;
        height: 32px !important;
        flex-shrink: 0;
    }

    .card-header .header-actions .btn-icon i,
    .card-header .header-actions .card-action-btn i {
        font-size: 1.125rem !important;
    }
}

/* 超小屏幕进一步优化 */
@media (max-width: 480px) {
    .card-header {
        gap: var(--space-xs);
    }

    .card-header > h1 {
        font-size: 1.125rem;
        padding-right: var(--space-xs);
    }

    .card-header .header-actions .btn-icon,
    .card-header .header-actions .card-action-btn {
        width: 28px !important;
        height: 28px !important;
    }

    .card-header .header-actions .btn-icon i,
    .card-header .header-actions .card-action-btn i {
        font-size: 1rem !important;
    }
}

/* ========================================
   修复移动端按钮遮挡标题问题
   ======================================== */

/* 移动端：使用更可靠的布局 */
@media (max-width: 767px) {
    .card-header {
        display: grid;
        grid-template-columns: 1fr auto;
        align-items: center;
        gap: var(--space-sm);
        padding: var(--space-md) 0;
        width: 100%;
    }

    .card-header > h1 {
        margin: 0;
        font-size: 1.125rem;
        line-height: 1.3;
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        padding-right: var(--space-sm);
    }

    .card-header .header-actions {
        display: flex;
        align-items: center;
        gap: var(--space-xs);
        flex-shrink: 0;
    }

    /* 确保按钮不被压缩 */
    .card-header .header-actions .btn-icon,
    .card-header .header-actions .card-action-dropdown {
        flex-shrink: 0;
        width: 36px;
        height: 36px;
    }

    .card-header .header-actions .btn-icon {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .card-header .header-actions .card-action-btn {
        width: 36px !important;
        height: 36px !important;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .card-header .header-actions .btn-icon i,
    .card-header .header-actions .card-action-btn i {
        font-size: 1.25rem !important;
        line-height: 1;
    }

    /* 确保deck-visibility不换行 */
    .card-header .deck-visibility {
        grid-column: 1 / -1;
        font-size: 0.75rem;
        margin: 0;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
}

/* 超小屏幕优化 */
@media (max-width: 380px) {
    .card-header {
        gap: var(--space-xs);
    }

    .card-header > h1 {
        font-size: 1rem;
    }

    .card-header .header-actions .btn-icon,
    .card-header .header-actions .card-action-dropdown {
        width: 32px;
        height: 32px;
    }

    .card-header .header-actions .card-action-btn {
        width: 32px !important;
        height: 32px !important;
    }

    .card-header .header-actions .btn-icon i,
    .card-header .header-actions .card-action-btn i {
        font-size: 1.125rem !important;
    }
}

/* ========================================
   确保移动端按钮横向排列
   ======================================== */

@media (max-width: 767px) {
    .card-header {
        display: grid;
        grid-template-columns: 1fr auto;
        align-items: center;
        gap: var(--space-sm);
        padding: var(--space-md) 0;
        width: 100%;
    }

    .card-header > h1 {
        margin: 0;
        font-size: 1.125rem;
        line-height: 1.3;
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        padding-right: var(--space-xs);
    }

    /* 关键：确保按钮容器横向排列 */
    .card-header .header-actions {
        display: flex;
        flex-direction: row !important;
        align-items: center;
        gap: var(--space-xs);
        flex-shrink: 0;
    }

    /* 确保每个按钮不被压缩 */
    .card-header .header-actions > * {
        flex-shrink: 0 !important;
        width: 36px !important;
        height: 36px !important;
    }

    /* 图标按钮样式 */
    .card-header .header-actions .btn-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 36px !important;
        height: 36px !important;
        border-radius: 50%;
    }

    /* 下拉菜单容器 */
    .card-header .header-actions .card-action-dropdown {
        display: inline-flex;
        align-items: center;
        position: relative;
    }

    /* 下拉菜单按钮 */
    .card-header .header-actions .card-action-btn {
        width: 36px !important;
        height: 36px !important;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .card-header .header-actions .btn-icon i,
    .card-header .header-actions .card-action-btn i {
        font-size: 1.25rem !important;
        line-height: 1;
    }

    /* 防止deck-visibility换行 */
    .card-header > .deck-visibility {
        grid-column: 1 / -1;
        font-size: 0.75rem;
        margin: var(--space-xs) 0 0 0;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
}

/* ========================================
   调整移动端标题字体大小
   ======================================== */

@media (max-width: 767px) {
    .card-header > h1 {
        font-size: 1.375rem !important;  /* 22px - 更大更醒目 */
        line-height: 1.3;
        font-weight: 600;
    }
}

@media (max-width: 480px) {
    .card-header > h1 {
        font-size: 1.25rem !important;  /* 20px - 小屏幕稍小但仍然醒目 */
    }
}

@media (max-width: 380px) {
    .card-header > h1 {
        font-size: 1.125rem !important;  /* 18px - 超小屏幕 */
    }
}

/* ========================================
   修正标题层级关系
   ======================================== */

@media (max-width: 767px) {
    /* 主标题应该比副标题大 */
    .card-header > h1 {
        font-size: 1.625rem !important;  /* 26px - 明显大于h2 */
        font-weight: 700;
        line-height: 1.2;
    }

    /* 确保卡片列表标题稍小 */
    .deck-cards-header > h2 {
        font-size: 1.25rem;  /* 20px */
        font-weight: 600;
    }
}

@media (max-width: 480px) {
    .card-header > h1 {
        font-size: 1.5rem !important;  /* 24px */
    }

    .deck-cards-header > h2 {
        font-size: 1.125rem;  /* 18px */
    }
}

@media (max-width: 380px) {
    .card-header > h1 {
        font-size: 1.375rem !important;  /* 22px */
    }

    .deck-cards-header > h2 {
        font-size: 1rem;  /* 16px */
    }
}

/* ========================================
   专业学术风格优化
   ======================================== */

/* 导航栏 - 更干净 */
.navbar {
    background-color: #FFFFFF;
    border-bottom: 1px solid #E2E8F0;
    box-shadow: var(--shadow-sm);
}

.nav-link {
    color: #64748B;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
}

/* 次级导航 */
.secondary-nav {
    background-color: #F8FAFC;
    border-bottom: 1px solid #E2E8F0;
}

.secondary-nav-links a {
    color: #64748B;
}

.secondary-nav-links a:hover {
    color: var(--color-primary);
}

.secondary-nav-links a.active {
    color: var(--color-primary);
    font-weight: 600;
}

/* 按钮 - 更专业 */
.btn {
    font-weight: 500;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border: none;
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    border-color: #E2E8F0;
    color: #475569;
    background: white;
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: #F8FAFC;
}

/* 卡片 - 更简洁 */
.card {
    background: white;
    border: 1px solid #E2E8F0;
    box-shadow: var(--shadow-sm);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: #CBD5E1;
}

/* 输入框 */
input, select, textarea {
    border-color: #E2E8F0;
    background: white;
    color: #1E293B;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* 搜索框 */
.search-input {
    background-color: #F8FAFC;
    border-color: #E2E8F0;
}

.search-input:focus {
    background-color: white;
    border-color: var(--color-primary);
}

/* 面包屑 */
.breadcrumb-item {
    color: #64748B;
}

.breadcrumb-item a {
    color: var(--color-primary);
}

.breadcrumb-item.active {
    color: #1E293B;
    font-weight: 500;
}

/* ========================================
   深色模式 - 专业学术风格
   ======================================== */

@media (prefers-color-scheme: dark) {
    :root {
        /* 主色 - 亮蓝色（深色背景下更清晰） */
        --color-primary: #60A5FA;
        --color-primary-dark: #3B82F6;
        --color-primary-light: #93C5FD;

        /* 辅助色 - 浅灰 */
        --color-secondary: #94A3B8;
        --color-secondary-light: #CBD5E1;

        /* 背景色 - 深色系 */
        --color-bg: #0F172A;
        --color-bg-light: #1E293B;
        --color-bg-white: #1E293B;
        --color-bg-gray: #334155;

        /* 文字色 - 反转 */
        --color-text: #F1F5F9;
        --color-text-secondary: #CBD5E1;
        --color-text-light: #94A3B8;
        --color-text-lighter: #64748B;
        --color-text-primary: #FFFFFF;

        /* 功能色 - 调整对比度 */
        --color-border: #334155;
        --color-border-light: #1E293B;
        --color-success: #34D399;
        --color-danger: #F87171;
        --color-info: #60A5FA;
        --color-warning: #FBBF24;

        /* 阴影 - 深色模式下更柔和 */
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    }

    /* 导航栏 */
    .navbar {
        background-color: #1E293B;
        border-bottom-color: #334155;
    }

    /* 次级导航 */
    .secondary-nav {
        background-color: #0F172A;
        border-bottom-color: #334155;
    }

    /* 按钮 */
    .btn-outline {
        border-color: #475569;
        color: #CBD5E1;
        background: #1E293B;
    }

    .btn-outline:hover {
        border-color: var(--color-primary);
        color: var(--color-primary);
        background: #334155;
    }

    /* 卡片 */
    .card {
        background: #1E293B;
        border-color: #334155;
    }

    .card:hover {
        border-color: #475569;
    }

    /* 输入框 */
    input, select, textarea {
        background: #0F172A;
        border-color: #334155;
        color: #F1F5F9;
    }

    input:focus, select:focus, textarea:focus {
        background: #1E293B;
        border-color: var(--color-primary);
    }

    /* 搜索框 */
    .search-input {
        background-color: #1E293B;
        border-color: #334155;
        color: #F1F5F9;
    }

    .search-input:focus {
        background-color: #0F172A;
        border-color: var(--color-primary);
    }

    /* 文字颜色 */
    h1, h2, h3, h4, h5, h6 {
        color: #F1F5F9;
    }

    p {
        color: #CBD5E1;
    }

    /* 面包屑 */
    .breadcrumb-item {
        color: #94A3B8;
    }

    .breadcrumb-item a {
        color: var(--color-primary);
    }

    .breadcrumb-item.active {
        color: #F1F5F9;
    }
}

/* 手动深色模式切换类（可选） */
body.dark-mode {
    /* 主色 - 亮蓝色 */
    --color-primary: #60A5FA !important;
    --color-primary-dark: #3B82F6 !important;
    --color-primary-light: #93C5FD !important;

    /* 辅助色 */
    --color-secondary: #94A3B8 !important;
    --color-secondary-light: #CBD5E1 !important;

    /* 背景色 */
    --color-bg: #0F172A !important;
    --color-bg-light: #1E293B !important;
    --color-bg-white: #1E293B !important;
    --color-bg-gray: #334155 !important;

    /* 文字色 */
    --color-text: #F1F5F9 !important;
    --color-text-secondary: #CBD5E1 !important;
    --color-text-light: #94A3B8 !important;
    --color-text-lighter: #64748B !important;
    --color-text-primary: #FFFFFF !important;

    /* 功能色 */
    --color-border: #334155 !important;
    --color-border-light: #1E293B !important;
    --color-success: #34D399 !important;
    --color-danger: #F87171 !important;
    --color-info: #60A5FA !important;
    --color-warning: #FBBF24 !important;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3) !important;
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4) !important;
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5) !important;

    /* 覆盖组件样式 */
    background-color: #0F172A !important;
    color: #F1F5F9 !important;
}

body.dark-mode .navbar {
    background-color: #1E293B !important;
    border-bottom-color: #334155 !important;
}

body.dark-mode .secondary-nav {
    background-color: #0F172A !important;
    border-bottom-color: #334155 !important;
}

body.dark-mode .card {
    background: #1E293B !important;
    border-color: #334155 !important;
}

body.dark-mode .btn-outline {
    border-color: #475569 !important;
    color: #CBD5E1 !important;
    background: #1E293B !important;
}

body.dark-mode input,
body.dark-mode select,
body.dark-mode textarea {
    background: #0F172A !important;
    border-color: #334155 !important;
    color: #F1F5F9 !important;
}

body.dark-mode .search-input {
    background-color: #1E293B !important;
    border-color: #334155 !important;
    color: #F1F5F9 !important;
}

/* Mobile search icon in dark mode */
body.dark-mode .search-icon-mobile {
    color: #F1F5F9;
}

body.dark-mode .search-icon-mobile:hover {
    color: var(--color-primary);
}

/* Mobile menu in dark mode */
body.dark-mode .mobile-menu-content {
    background-color: #1E293B;
}

body.dark-mode .mobile-menu-header {
    border-color: #334155;
    color: #F1F5F9;
}

body.dark-mode .mobile-menu-close {
    color: #94A3B8;
}

body.dark-mode .mobile-menu-close:hover {
    color: #F1F5F9;
}

body.dark-mode .mobile-menu-item {
    color: #F1F5F9;
}

body.dark-mode .mobile-menu-item:hover {
    background-color: #334155;
}

body.dark-mode .mobile-menu-toggle {
    color: #F1F5F9;
}

body.dark-mode .mobile-menu-toggle:hover {
    color: var(--color-primary);
}

/* ========================================
   深色模式切换按钮
   ======================================== */

.dark-mode-toggle {
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: #64748B;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.dark-mode-toggle:hover {
    color: var(--color-primary);
    transform: scale(1.1);
}

.dark-mode-toggle:active {
    transform: scale(0.95);
}

/* === Notification Badge === */
.nav-link .notification-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    background-color: var(--color-danger);
    color: white;
    font-size: 0.6875rem;
    font-weight: 600;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 3px rgba(239, 68, 68, 0.3);
    z-index: 10;
}

.nav-link .notification-badge.large {
    font-size: 0.625rem;
    padding: 0 4px;
}

/* 深色模式下的按钮样式 */
body.dark-mode .dark-mode-toggle {
    color: #94A3B8;
}

body.dark-mode .dark-mode-toggle:hover {
    color: var(--color-primary);
}

body.dark-mode .nav-link .notification-badge {
    background-color: #EF4444;
    color: white;
    box-shadow: 0 1px 3px rgba(239, 68, 68, 0.5);
}

/* Notification pulse animation */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

/* ========================================
   院校标签深色模式颜色转换
   ======================================== */

/* 北京中医药大学 - 红色系 */
body.dark-mode span[style*="background: #FEF2F2"] {
    background: #7F1D1D !important;
    color: #FCA5A5 !important;
    border-color: #991B1B !important;
}

/* 上海中医药大学 - 绿色系 */
body.dark-mode span[style*="background: #F0FDF4"] {
    background: #14532D !important;
    color: #86EFAC !important;
    border-color: #166534 !important;
}

/* 南京中医药大学 - 蓝色系 */
body.dark-mode span[style*="background: #EFF6FF"] {
    background: #1E3A8A !important;
    color: #93C5FD !important;
    border-color: #1E40AF !important;
}

/* 广州中医药大学 - 绿色系 */
body.dark-mode span[style*="background: #ECFDF5"] {
    background: #064E3B !important;
    color: #6EE7B7 !important;
    border-color: #065F46 !important;
}

/* 成都中医药大学 - 橙色系 */
body.dark-mode span[style*="background: #FFF7ED"] {
    background: #7C2D12 !important;
    color: #FDBA74 !important;
    border-color: #9A3412 !important;
}

/* 山东中医药大学 - 紫色系 */
body.dark-mode span[style*="background: #F5F3FF"] {
    background: #4C1D95 !important;
    color: #C4B5FD !important;
    border-color: #5B21B6 !important;
}

/* 天津中医药大学 - 青色系 */
body.dark-mode span[style*="background: #ECFEFF"] {
    background: #164E63 !important;
    color: #67E8F9 !important;
    border-color: #0E7490 !important;
}

/* 辽宁中医药大学 - 靛蓝系 */
body.dark-mode span[style*="background: #EEF2FF"] {
    background: #3730A3 !important;
    color: #A5B4FC !important;
    border-color: #4338CA !important;
}

/* 河北中医药大学 - 黄色系 */
body.dark-mode span[style*="background: #FEFCE8"] {
    background: #713F12 !important;
    color: #FDE047 !important;
    border-color: #92400E !important;
}

/* 湖北中医药大学 - 青色系 */
body.dark-mode span[style*="background: #F0FDFA"] {
    background: #134E4A !important;
    color: #5EEAD4 !important;
    border-color: #115E59 !important;
}

/* 河南中医药大学、云南中医药大学 - 紫色系 */
body.dark-mode span[style*="background: #FAF5FF"] {
    background: #581C87 !important;
    color: #D8B4FE !important;
    border-color: #6B21A8 !important;
}

/* 陕西中医药大学 - 玫瑰红系 */
body.dark-mode span[style*="background: #FFF1F2"] {
    background: #881337 !important;
    color: #FDA4AF !important;
    border-color: #9F1239 !important;
}

/* 山西中医药大学、湖北中医药大学 - 青色系 */
body.dark-mode span[style*="background: #F0FDFA"] {
    background: #115E59 !important;
    color: #5EEAD4 !important;
    border-color: #0F766E !important;
}

/* 默认学校颜色 */
body.dark-mode span[style*="background: #F3F4F6"] {
    background: #374151 !important;
    color: #D1D5DB !important;
    border-color: #4B5563 !important;
}

/* 统计卡片水平滚动 - 深色模式渐变遮罩 */
body.dark-mode .stats-grid::after {
    background: linear-gradient(to left, #0F172A, transparent) !important;
}

/* 统计卡片 - 深色模式 */
body.dark-mode .stat-card {
    background: #1E293B !important;
    border-color: #334155 !important;
}

body.dark-mode .stat-value {
    color: var(--color-primary) !important;
}

body.dark-mode .stat-label {
    color: #94A3B8 !important;
}

/* 平台统计卡片（蓝色）- 深色模式下保持渐变 */
body.dark-mode .stat-card-blue {
    background: linear-gradient(135deg, #3B82F6 0%, #2563EB 100%) !important;
    color: white !important;
}

body.dark-mode .stat-card-blue .stat-value {
    color: white !important;
}

body.dark-mode .stat-card-blue .stat-label {
    color: rgba(255, 255, 255, 0.9) !important;
}

/* 今日活跃卡片（绿色）- 深色模式下保持渐变 */
body.dark-mode .stat-card-green {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%) !important;
    color: white !important;
}

body.dark-mode .stat-card-green .stat-value {
    color: white !important;
}

body.dark-mode .stat-card-green .stat-label {
    color: rgba(255, 255, 255, 0.9) !important;
}

/* 移动端优化 */
@media (max-width: 768px) {
    /* 深色模式切换按钮 */
    .dark-mode-toggle {
        padding: 0.375rem;
        font-size: 1.125rem;
    }

    /* === 卡片间距优化（保守方案）=== */

    /* 卡片组探索页面 - 卡片内边距 */
    .deck-card > div[style*="padding: 1.5rem"],
    a.deck-card > div {
        padding: 1rem !important;
    }

    /* 网格间距 */
    .deck-grid,
    .questions-grid,
    .posts-grid {
        gap: 1rem !important;
    }

    /* 通用卡片 */
    .card {
        padding: 0.875rem !important;
        margin-bottom: 0.75rem !important;
    }

    /* 动态卡片 */
    .post-item {
        padding: 0.875rem !important;
        margin-bottom: 0.75rem !important;
    }

    /* 问答卡片 */
    .question-item {
        padding: 0.875rem !important;
        margin-bottom: 0.75rem !important;
    }

    /* 卡片项 */
    .card-item {
        padding: 0.875rem !important;
        margin-bottom: 0.75rem !important;
    }

    /* 筛选栏优化 */
    .filter-bar {
        padding: 1rem !important;
        margin-bottom: 1rem !important;
    }

    /* 筛选栏表单元素 */
    .filter-bar input,
    .filter-bar select,
    .filter-bar a {
        padding: 0.625rem 0.875rem !important;
        font-size: 0.875rem !important;
    }

    /* === 字体大小微调 === */
    h1 {
        font-size: 1.5rem !important;
    }

    h2 {
        font-size: 1.25rem !important;
    }

    h3 {
        font-size: 1.125rem !important;
    }

    /* 页面头部优化 */
    .page-header {
        margin-bottom: 1rem !important;
    }

    .page-header p {
        font-size: 0.875rem !important;
    }
}

/* ========================================
   深色模式完整组件覆盖
   ======================================== */

/* 自动深色模式 */
@media (prefers-color-scheme: dark) {
    /* 卡片列表项 */
    .card-item {
        background: #1E293B !important;
        border-color: #334155 !important;
    }

    /* 卡片内容 */
    .card-item-title {
        color: #F1F5F9 !important;
    }

    .card-item-desc {
        color: #CBD5E1 !important;
    }

    .card-item-meta {
        color: #94A3B8 !important;
        border-top-color: #334155 !important;
    }

    /* 卡片答案区域 */
    .card-item-back {
        background: #0F172A !important;
        border-top-color: #334155 !important;
    }

    .card-back-content h4,
    .card-back-content h5 {
        color: #F1F5F9 !important;
    }

    .card-back-content p {
        color: #CBD5E1 !important;
    }

    /* 扩展信息 */
    .extra-tag {
        background: #334155 !important;
        color: #94A3B8 !important;
    }

    .extra-tag strong {
        color: #F1F5F9 !important;
    }

    /* 文件夹 */
    .folder-item {
        color: #CBD5E1 !important;
    }

    .folder-item:hover {
        background: #1E293B !important;
    }

    .folder-item.active {
        background: rgba(96, 165, 250, 0.1) !important;
        color: #60A5FA !important;
    }

    .folder-icon {
        color: #FBBF24 !important;
    }

    .folder-header {
        background: #1E293B !important;
    }

    .folder-title {
        color: #F1F5F9 !important;
    }

    .folder-stats {
        color: #94A3B8 !important;
    }

    .folder-children {
        border-left-color: #334155 !important;
    }

    /* 卡片组操作菜单 */
    .card-action-menu {
        background: #1E293B !important;
        border-color: #334155 !important;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.5) !important;
    }

    .action-menu-item {
        color: #CBD5E1 !important;
    }

    .action-menu-item:hover {
        background: #334155 !important;
        color: #60A5FA !important;
    }

    .dropdown-divider {
        background: #334155 !important;
    }

    /* 按钮和图标 */
    .card-action-btn {
        color: #94A3B8 !important;
        background: #1E293B !important;
    }

    .card-action-btn:hover {
        color: #60A5FA !important;
        background: #334155 !important;
    }

    .btn-icon {
        color: #CBD5E1 !important;
        background: #1E293B !important;
    }

    .btn-icon:hover {
        background: #334155 !important;
    }

    /* 导航链接 */
    .nav-link {
        color: #CBD5E1 !important;
    }

    /* 次级导航链接 */
    .secondary-nav-links a {
        color: #94A3B8 !important;
    }

    /* 空状态 */
    .empty-state {
        color: #94A3B8 !important;
    }

    .empty-state h3 {
        color: #CBD5E1 !important;
    }

    .empty-state p {
        color: #64748B !important;
    }

    /* 表单标签 */
    label {
        color: #CBD5E1 !important;
    }

    /* 排序控件 */
    .sort-controls {
        color: #CBD5E1 !important;
    }

    .sort-select {
        background: #1E293B !important;
        color: #F1F5F9 !important;
        border-color: #334155 !important;
    }

    /* 下拉选择框 */
    select.action-select {
        background: #0F172A !important;
        color: #F1F5F9 !important;
        border-color: #334155 !important;
    }

    /* 面包屑 */
    .breadcrumb-separator {
        color: #64748B !important;
    }

    /* 页脚 */
    .footer {
        background: #0F172A !important;
        border-top-color: #334155 !important;
    }

    .compliance-notice,
    .copyright {
        color: #64748B !important;
    }

    /* 卡片头部 */
    .deck-visibility {
        color: #94A3B8 !important;
    }

    /* 文字颜色修正 */
    h1, h2, h3, h4, h5, h6 {
        color: #F1F5F9 !important;
    }

    p, span, div {
        color: #CBD5E1 !important;
    }

    /* 特殊情况：保持链接颜色 */
    a {
        color: #60A5FA !important;
    }

    a:hover {
        color: #93C5FD !important;
    }
}

/* 手动深色模式 */
body.dark-mode .card-item {
    background: #1E293B !important;
    border-color: #334155 !important;
}

body.dark-mode .card-item-title {
    color: #F1F5F9 !important;
}

body.dark-mode .card-item-desc {
    color: #CBD5E1 !important;
}

body.dark-mode .card-item-meta {
    color: #94A3B8 !important;
    border-top-color: #334155 !important;
}

body.dark-mode .card-item-back {
    background: #0F172A !important;
    border-top-color: #334155 !important;
}

body.dark-mode .card-back-content h4,
body.dark-mode .card-back-content h5 {
    color: #F1F5F9 !important;
}

body.dark-mode .card-back-content p {
    color: #CBD5E1 !important;
}

body.dark-mode .extra-tag {
    background: #334155 !important;
    color: #94A3B8 !important;
}

body.dark-mode .extra-tag strong {
    color: #F1F5F9 !important;
}

body.dark-mode .folder-item {
    color: #CBD5E1 !important;
}

body.dark-mode .folder-item:hover {
    background: #1E293B !important;
}

body.dark-mode .folder-item.active {
    background: rgba(96, 165, 250, 0.1) !important;
    color: #60A5FA !important;
}

body.dark-mode .folder-icon {
    color: #FBBF24 !important;
}

body.dark-mode .folder-header {
    background: #1E293B !important;
}

body.dark-mode .folder-title {
    color: #F1F5F9 !important;
}

body.dark-mode .folder-stats {
    color: #94A3B8 !important;
}

body.dark-mode .folder-children {
    border-left-color: #334155 !important;
}

body.dark-mode .card-action-menu {
    background: #1E293B !important;
    border-color: #334155 !important;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.5) !important;
}

body.dark-mode .action-menu-item {
    color: #CBD5E1 !important;
}

body.dark-mode .action-menu-item:hover {
    background: #334155 !important;
    color: #60A5FA !important;
}

body.dark-mode .dropdown-divider {
    background: #334155 !important;
}

body.dark-mode .card-action-btn {
    color: #94A3B8 !important;
    background: #1E293B !important;
}

body.dark-mode .card-action-btn:hover {
    color: #60A5FA !important;
    background: #334155 !important;
}

body.dark-mode .btn-icon {
    color: #CBD5E1 !important;
    background: #1E293B !important;
}

body.dark-mode .btn-icon:hover {
    background: #334155 !important;
}

body.dark-mode .nav-link {
    color: #CBD5E1 !important;
}

body.dark-mode .secondary-nav-links a {
    color: #94A3B8 !important;
}

body.dark-mode .empty-state {
    color: #94A3B8 !important;
}

body.dark-mode .empty-state h3 {
    color: #CBD5E1 !important;
}

body.dark-mode .empty-state p {
    color: #64748B !important;
}

body.dark-mode label {
    color: #CBD5E1 !important;
}

body.dark-mode .sort-controls {
    color: #CBD5E1 !important;
}

body.dark-mode .sort-select {
    background: #1E293B !important;
    color: #F1F5F9 !important;
    border-color: #334155 !important;
}

body.dark-mode select.action-select {
    background: #0F172A !important;
    color: #F1F5F9 !important;
    border-color: #334155 !important;
}

body.dark-mode .breadcrumb-separator {
    color: #64748B !important;
}

body.dark-mode .footer {
    background: #0F172A !important;
    border-top-color: #334155 !important;
}

body.dark-mode .compliance-notice,
body.dark-mode .copyright,
body.dark-mode .icp-info,
body.dark-mode .icp-info a {
    color: #64748B !important;
}

body.dark-mode .deck-visibility {
    color: #94A3B8 !important;
}

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4,
body.dark-mode h5,
body.dark-mode h6 {
    color: #F1F5F9 !important;
}

/* 修复：让span和div保持继承颜色，不强制覆盖 */
body.dark-mode p,
body.dark-mode span:not(.card-item-title):not(.breadcrumb-item):not(.deck-visibility):not(.card-date):not(.extra-key):not(.extra-value) {
    color: #CBD5E1 !important;
}

/* 卡片日期 */
body.dark-mode .card-date {
    color: #94A3B8 !important;
}

/* 扩展信息的键值对 */
body.dark-mode .extra-key {
    color: #94A3B8 !important;
}

body.dark-mode .extra-value {
    color: #F1F5F9 !important;
}

/* 卡片展开图标 */
body.dark-mode .card-item-expand {
    color: #94A3B8;
}

body.dark-mode .card-item-expand:hover {
    background: #334155;
    color: #818CF8;
}

/* 扩展信息项 */
body.dark-mode .extra-item {
    background: #1E293B;
    border-color: #334155;
}

/* 扩展信息容器 */
body.dark-mode .card-back-extra {
    border-top-color: #334155;
}

body.dark-mode .card-back-extra h5 {
    color: #94A3B8;
}

/* ========================================
   补充：深色模式缺失的组件样式
   ======================================== */

/* 自动深色模式 */
@media (prefers-color-scheme: dark) {
    /* 文件夹和卡片组预览卡片 */
    .folder-card,
    .deck-card {
        background: #1E293B !important;
        border-color: #334155 !important;
    }

    .folder-card:hover,
    .deck-card:hover {
        border-color: #475569 !important;
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5) !important;
    }

    /* 下拉菜单 */
    .dropdown-menu {
        background: #1E293B !important;
        border-color: #334155 !important;
    }

    .dropdown-menu a,
    .dropdown-menu button {
        color: #CBD5E1 !important;
    }

    .dropdown-menu a:hover,
    .dropdown-menu button:hover {
        background: #334155 !important;
        color: #60A5FA !important;
    }

    /* 图标按钮 */
    .icon-btn {
        background: #1E293B !important;
        color: #CBD5E1 !important;
        border-color: #334155 !important;
    }

    .icon-btn:hover {
        background: #334155 !important;
        color: #60A5FA !important;
        border-color: #60A5FA !important;
    }

    /* 扩展信息网格 */
    .extra-grid {
        background: transparent !important;
    }

    /* 卡片组封面区域 */
    .deck-cover {
        background: #0F172A !important;
        border-color: #334155 !important;
    }

    /* 卡片组统计信息 */
    .deck-stats,
    .folder-stats {
        color: #94A3B8 !important;
    }

    /* 卡片组描述 */
    .deck-description,
    .folder-description {
        color: #CBD5E1 !important;
    }

    /* 标签 */
    .tag {
        background: #334155 !important;
        color: #94A3B8 !important;
    }

    /* 分隔线 */
    .dropdown-divider,
    .divider {
        background: #334155 !important;
    }

    /* 模态框/弹出层 */
    .modal {
        background: #1E293B !important;
    }

    .modal-header {
        border-bottom-color: #334155 !important;
    }

    .modal-footer {
        border-top-color: #334155 !important;
    }

    /* 提示框 */
    .tooltip {
        background: #0F172A !important;
        color: #F1F5F9 !important;
    }
}

/* 手动深色模式 */
body.dark-mode .folder-card,
body.dark-mode .deck-card {
    background: #1E293B !important;
    border-color: #334155 !important;
}

body.dark-mode .folder-card:hover,
body.dark-mode .deck-card:hover {
    border-color: #475569 !important;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5) !important;
}

body.dark-mode .dropdown-menu {
    background: #1E293B !important;
    border-color: #334155 !important;
}

body.dark-mode .dropdown-menu a,
body.dark-mode .dropdown-menu button {
    color: #CBD5E1 !important;
}

body.dark-mode .dropdown-menu a:hover,
body.dark-mode .dropdown-menu button:hover {
    background: #334155 !important;
    color: #60A5FA !important;
}

body.dark-mode .icon-btn {
    background: #1E293B !important;
    color: #CBD5E1 !important;
    border-color: #334155 !important;
}

body.dark-mode .icon-btn:hover {
    background: #334155 !important;
    color: #60A5FA !important;
    border-color: #60A5FA !important;
}

body.dark-mode .extra-grid {
    background: transparent !important;
}

body.dark-mode .deck-cover {
    background: #0F172A !important;
    border-color: #334155 !important;
}

body.dark-mode .deck-stats,
body.dark-mode .folder-stats {
    color: #94A3B8 !important;
}

body.dark-mode .deck-description,
body.dark-mode .folder-description {
    color: #CBD5E1 !important;
}

body.dark-mode .tag {
    background: #334155 !important;
    color: #94A3B8 !important;
}

body.dark-mode .dropdown-divider,
body.dark-mode .divider {
    background: #334155 !important;
}

body.dark-mode .modal {
    background: #1E293B !important;
}

body.dark-mode .modal-header {
    border-bottom-color: #334155 !important;
}

body.dark-mode .modal-footer {
    border-top-color: #334155 !important;
}

body.dark-mode .tooltip {
    background: #0F172A !important;
    color: #F1F5F9 !important;
}

/* ========================================
   今日复习页面深色模式
   ======================================== */

/* 自动深色模式 */
@media (prefers-color-scheme: dark) {
    /* 学习卡片容器 */
    .study-card {
        background: #1E293B !important;
        border: 1px solid #334155 !important;
    }

    /* 卡片正面和背面文字 */
    .card-front {
        color: #F1F5F9 !important;
    }

    .card-back h3 {
        color: #CBD5E1 !important;
    }

    .card-back .answer-content {
        color: #F1F5F9 !important;
    }

    .card-back .extra-notes {
        background: #0F172A !important;
        color: #CBD5E1 !important;
        border-left-color: #60A5FA !important;
    }

    /* 进度条容器 */
    .progress-bar-container {
        background: #1E293B !important;
        border: 1px solid #334155 !important;
    }

    .progress-stats {
        color: #CBD5E1 !important;
    }

    .progress-stats .stat-value {
        color: #F1F5F9 !important;
    }

    .progress-track {
        background: #334155 !important;
    }

    /* 评分按钮 - 深色版本 */
    .rating-btn.again {
        background: #3E1A1A !important;
        border-color: #DC2626 !important;
        color: #FCA5A5 !important;
    }

    .rating-btn.again:hover {
        background: #4A1F1F !important;
        border-color: #EF4444 !important;
    }

    .rating-btn.hard {
        background: #3E2E1A !important;
        border-color: #EA580C !important;
        color: #FDBA74 !important;
    }

    .rating-btn.hard:hover {
        background: #4A361F !important;
        border-color: #F97316 !important;
    }

    .rating-btn.good {
        background: #1A3A4E !important;
        border-color: #3B82F6 !important;
        color: #93C5FD !important;
    }

    .rating-btn.good:hover {
        background: #1F4A5E !important;
        border-color: #60A5FA !important;
    }

    .rating-btn.easy {
        background: #1A3E2A !important;
        border-color: #22C55E !important;
        color: #86EFAC !important;
    }

    .rating-btn.easy:hover {
        background: #1F4A33 !important;
        border-color: #4ADE80 !important;
    }

    /* 键盘提示 */
    .keyboard-hint {
        color: #94A3B8 !important;
    }

    .keyboard-hint kbd {
        background: #1E293B !important;
        color: #CBD5E1 !important;
        border-color: #334155 !important;
    }
}

/* 手动深色模式 */
body.dark-mode .study-card {
    background: #1E293B !important;
    border: 1px solid #334155 !important;
}

body.dark-mode .card-front {
    color: #F1F5F9 !important;
}

body.dark-mode .card-back h3 {
    color: #CBD5E1 !important;
}

body.dark-mode .card-back .answer-content {
    color: #F1F5F9 !important;
}

body.dark-mode .card-back .extra-notes {
    background: #0F172A !important;
    color: #CBD5E1 !important;
    border-left-color: #60A5FA !important;
}

body.dark-mode .progress-bar-container {
    background: #1E293B !important;
    border: 1px solid #334155 !important;
}

body.dark-mode .progress-stats {
    color: #CBD5E1 !important;
}

body.dark-mode .progress-stats .stat-value {
    color: #F1F5F9 !important;
}

body.dark-mode .progress-track {
    background: #334155 !important;
}

body.dark-mode .rating-btn.again {
    background: #3E1A1A !important;
    border-color: #DC2626 !important;
    color: #FCA5A5 !important;
}

body.dark-mode .rating-btn.again:hover {
    background: #4A1F1F !important;
    border-color: #EF4444 !important;
}

body.dark-mode .rating-btn.hard {
    background: #3E2E1A !important;
    border-color: #EA580C !important;
    color: #FDBA74 !important;
}

body.dark-mode .rating-btn.hard:hover {
    background: #4A361F !important;
    border-color: #F97316 !important;
}

body.dark-mode .rating-btn.good {
    background: #1A3A4E !important;
    border-color: #3B82F6 !important;
    color: #93C5FD !important;
}

body.dark-mode .rating-btn.good:hover {
    background: #1F4A5E !important;
    border-color: #60A5FA !important;
}

body.dark-mode .rating-btn.easy {
    background: #1A3E2A !important;
    border-color: #22C55E !important;
    color: #86EFAC !important;
}

body.dark-mode .rating-btn.easy:hover {
    background: #1F4A33 !important;
    border-color: #4ADE80 !important;
}

body.dark-mode .keyboard-hint {
    color: #94A3B8 !important;
}

body.dark-mode .keyboard-hint kbd {
    background: #1E293B !important;
    color: #CBD5E1 !important;
    border-color: #334155 !important;
}



/* 点赞和收藏按钮 - 深色模式 */
body.dark-mode .like-btn.unliked,
body.dark-mode .bookmark-btn.unbookmarked {
    background: #1E293B !important;
    color: #94A3B8 !important;
    border-color: #334155 !important;
}

body.dark-mode .like-btn.unliked:hover,
body.dark-mode .bookmark-btn.unbookmarked:hover {
    background: #334155 !important;
    color: #CBD5E1 !important;
    border-color: #475569 !important;
}

/* 已点赞状态保持原有渐变 */
body.dark-mode .like-btn.liked {
    background: linear-gradient(135deg, #991B1B 0%, #DC2626 100%) !important;
    color: #FECACA !important;
    border-color: #7F1D1D !important;
}

/* 已收藏状态保持原有渐变 */
body.dark-mode .bookmark-btn.bookmarked {
    background: linear-gradient(135deg, #B45309 0%, #D97706 100%) !important;
    color: #FEF3C7 !important;
    border-color: #92400E !important;
}

/* Post actions border dark mode */
body.dark-mode .post-actions {
    border-top-color: #1E293B !important;
}




/* 未认证用户标签 - 深色模式 */
body.dark-mode .unverified-badge {
    background: #334155 !important;
    color: #94A3B8 !important;
    border: 1px solid #475569 !important;
}

/* 已采纳状态 - 深色模式 */
body.dark-mode .accepted-status {
    background: #1E3A5F !important;
    border-color: #2563EB !important;
}

body.dark-mode .accepted-status span:first-child {
    color: #60A5FA !important;
}

body.dark-mode .accepted-status span:last-child {
    color: #3B82F6 !important;
}

/* 未采纳状态 - 深色模式 */
body.dark-mode .unaccepted-status {
    background: #1E293B !important;
    border: 1px solid #334155 !important;
}

body.dark-mode .unaccepted-status span {
    color: #9CA3AF !important;
}


/* === Icon Loading Optimization === */
/* 图标字体加载优化 */
@font-face {
  font-family: "remixicon";
  src: url("fonts/remixicon.woff2?t=1690730386070") format("woff2"),
       url("fonts/remixicon.woff?t=1690730386070") format("woff");
  font-display: swap;
}

/* 优化图标加载体验 */
[class^="ri-"], [class*=" ri-"] {
  display: inline-block;
  font-style: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-width: 1em;
}

/* 字体加载完成后移除过渡效果 */
.wf-active [class^="ri-"],
.wf-active [class*=" ri-"] {
  font-display: swap;
}