/* SinoXivs Additional Styles - Fix missing CSS classes */

/* ===== Feature Cards ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin: 24px 0;
}

.feature-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    text-align: center;
    transition: all 0.2s ease;
}

.feature-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-card .feature-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    color: #fff;
    font-size: 28px;
}

.feature-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin: 24px 0;
}

.stat-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    text-align: center;
    transition: all 0.2s ease;
}

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

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    line-height: 1;
}

.stat-label {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== About Content ===== */
.about-content {
    margin: 24px 0;
}

.about-content p {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

/* ===== Contact Page Styles ===== */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.contact-info h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

.contact-method {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.contact-method i {
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 20px;
    flex-shrink: 0;
}

.contact-method h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.contact-method p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.social-connect h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.social-links-large {
    display: flex;
    gap: 12px;
}

.social-links-large .social-link {
    width: 48px;
    height: 48px;
}

/* ===== Form Styles ===== */
.form-row {
    margin-bottom: 16px;
}

.form-row.multi-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    background: #fff;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.form-group.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-top: 4px;
}

.form-group.checkbox-group label {
    margin-bottom: 0;
    font-weight: 400;
    cursor: pointer;
}

.form-actions {
    display: flex;
    gap: 16px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.form-section {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.form-section:last-child {
    border-bottom: none;
}

.form-section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
}

/* ===== Submit Page Styles ===== */
.submit-steps {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 24px;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0.5;
}

.step.active {
    opacity: 1;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--text-secondary);
}

.step.active .step-number {
    background: var(--primary-gradient);
    color: #fff;
}

.step-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.step.active .step-title {
    color: var(--primary);
    font-weight: 600;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg-tertiary);
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.1);
}

.upload-icon {
    font-size: 48px;
    color: var(--primary-light);
    margin-bottom: 16px;
}

.upload-text {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.upload-hint {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.file-list {
    margin-top: 16px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
}

.file-item i {
    color: var(--danger);
    font-size: 20px;
}

.file-name {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.file-size {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.file-remove {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    transition: color 0.2s ease;
}

.file-remove:hover {
    color: var(--danger);
}

/* ===== Profile Page Styles ===== */
.profile-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 24px;
}

.profile-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.profile-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    text-align: center;
}

.profile-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 16px;
    border: 4px solid var(--border-color);
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-name {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.profile-institution {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.profile-field {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.profile-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

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

.profile-stat .stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary);
    display: block;
}

.profile-stat .stat-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
}

.profile-menu {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.profile-menu .menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.2s ease;
    border-bottom: 1px solid var(--border-color);
}

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

.profile-menu .menu-item:hover,
.profile-menu .menu-item.active {
    background: var(--bg-tertiary);
    color: var(--primary);
}

.profile-menu .menu-item i {
    width: 20px;
    text-align: center;
}

.profile-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Sidebar Modules */
.sidebar-module {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.sidebar-module .module-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

/* Academic Impact */
.impact-metrics {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.impact-metric {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.impact-metric .metric-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.impact-metric .metric-info {
    flex: 1;
}

.impact-metric .metric-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
}

.impact-metric .metric-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Suggested Collaborators */
.collaborator-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.collaborator-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: var(--radius-md);
    transition: background 0.2s;
}

.collaborator-item:hover {
    background: var(--bg-tertiary);
}

.collaborator-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.collaborator-info {
    flex: 1;
    min-width: 0;
}

.collaborator-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.collaborator-inst {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-follow {
    padding: 4px 12px;
    border: 1px solid var(--primary);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--primary);
    font-size: var(--font-size-xs);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.btn-follow:hover {
    background: var(--primary);
    color: #fff;
}

/* Trending in Field */
.trending-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.trending-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: all 0.2s;
    text-decoration: none;
}

.trending-item:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
}

.trending-rank {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-size: var(--font-size-xs);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.trending-item:nth-child(1) .trending-rank {
    background: #fef3c7;
    color: #d97706;
}

.trending-item:nth-child(2) .trending-rank {
    background: #f3f4f6;
    color: #6b7280;
}

.trending-item:nth-child(3) .trending-rank {
    background: #fff7ed;
    color: #c2410c;
}

.content-section {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.about-text {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.8;
}

.interests-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

/* ===== My Papers Page Styles ===== */
.papers-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    padding: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    width: fit-content;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    background: #fff;
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.paper-status {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.paper-status.published {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.paper-status.review {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.paper-status.draft {
    background: rgba(148, 163, 184, 0.1);
    color: var(--text-muted);
}

.paper-actions {
    display: flex;
    gap: 8px;
    margin-top: 16px;
}

/* ===== Guidelines Page Styles ===== */
.guidelines-toc {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 32px;
}

.guidelines-toc h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.guidelines-toc ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

.guidelines-toc li a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: color 0.2s ease;
}

.guidelines-toc li a:hover {
    color: var(--primary);
}

.guideline-section {
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.guideline-section:last-child {
    border-bottom: none;
}

.content-block {
    margin-top: 24px;
}

.content-block h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.content-list {
    list-style: none;
    margin-bottom: 24px;
}

.content-list li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
}

.content-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 16px;
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
}

.content-list li strong {
    color: var(--text-primary);
}

.format-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}

.format-table th,
.format-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.format-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.format-table td {
    color: var(--text-secondary);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.process-step {
    text-align: center;
    padding: 24px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
}

.step-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    color: #fff;
    font-size: 24px;
}

.process-step h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.process-step p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 24px;
}

.faq-item {
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.faq-question {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.faq-answer {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Browse Page Styles ===== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.category-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all 0.2s ease;
    cursor: pointer;
}

.category-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.category-card .category-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 24px;
    margin-bottom: 16px;
}

.category-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.category-card .category-count {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: 12px;
}

.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.category-tags span {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 20px;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

/* ===== Templates Page Styles ===== */
.templates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.template-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all 0.2s ease;
}

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

.template-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: #fff;
    font-size: 32px;
}

.template-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.template-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.template-features {
    list-style: none;
    text-align: left;
    margin-bottom: 24px;
}

.template-features li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.template-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: 600;
}

.reference-styles {
    margin-top: 48px;
}

.style-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.style-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 20px;
}

.style-card h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.style-example {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-family: monospace;
    background: #fff;
    padding: 12px;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary);
}

/* ===== Advanced Search Page Styles ===== */
.advanced-search-form {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.search-field {
    margin-bottom: 20px;
}

.search-field label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.search-field input,
.search-field select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    background: #fff;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-field input:focus,
.search-field select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-actions {
    display: flex;
    gap: 16px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

/* ===== Videos Page Styles ===== */
.videos-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    padding: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    width: fit-content;
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.video-card {
    display: block;
    text-decoration: none;
    color: inherit;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.2s ease;
    cursor: pointer;
}

.video-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.video-thumbnail {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
    overflow: hidden;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    padding: 4px 8px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: var(--radius-sm);
}

.video-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 24px;
    transition: all 0.2s ease;
}

.video-card:hover .video-play {
    background: #fff;
    transform: translate(-50%, -50%) scale(1.1);
}

.video-info {
    padding: 20px;
}

.video-info h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.video-meta {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-bottom: 8px;
}

.video-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== Popular Videos Sidebar Styles ===== */
.popular-videos-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.popular-video-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.25s ease;
}

.popular-video-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.popular-video-thumb {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
    overflow: hidden;
}

.popular-video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.popular-video-card:hover .popular-video-thumb img {
    transform: scale(1.05);
}

.popular-video-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    transition: all 0.2s ease;
}

.popular-video-play i {
    color: var(--primary);
    font-size: 12px;
    margin-left: 2px;
}

.popular-video-card:hover .popular-video-play {
    background: #fff;
    transform: translate(-50%, -50%) scale(1.1);
}

.popular-video-duration {
    position: absolute;
    bottom: 4px;
    right: 4px;
    padding: 2px 5px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    font-size: 10px;
    font-weight: 600;
    border-radius: 3px;
    font-variant-numeric: tabular-nums;
}

.popular-video-info {
    padding: 10px;
}

.popular-video-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    margin: 0 0 6px 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.2s ease;
}

.popular-video-card:hover .popular-video-title {
    color: var(--primary);
}

.popular-video-meta {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 6px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.popular-video-meta span {
    display: flex;
    align-items: center;
    gap: 3px;
}

.popular-video-meta i {
    font-size: 10px;
    color: var(--text-muted);
}

.popular-video-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.popular-video-tag {
    padding: 2px 6px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    font-size: 10px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.2s ease;
}

.popular-video-card:hover .popular-video-tag {
    background: var(--primary-light);
    color: #fff;
}

@media (max-width: 1200px) {
    .popular-videos-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .popular-videos-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Stats Grid for Videos */
.sidebar-card .stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.sidebar-card .stat-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    text-align: center;
}

.sidebar-card .stat-icon {
    width: 36px;
    height: 36px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 14px;
    margin-bottom: 8px;
}

.sidebar-card .stat-value {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.sidebar-card .stat-label {
    font-size: 11px;
    color: var(--text-muted);
    white-space: nowrap;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.quick-action-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s ease;
}

.quick-action-btn:hover {
    background: var(--primary);
    color: #fff;
}

.quick-action-btn i {
    font-size: 14px;
    color: var(--primary);
    transition: color 0.2s ease;
}

.quick-action-btn:hover i {
    color: #fff;
}

/* ===== Search Results Styles ===== */
.search-results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.results-count {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 32px;
}

.page-btn {
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #fff;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.page-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.page-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.page-ellipsis {
    display: flex;
    align-items: center;
    color: var(--text-muted);
}

/* ===== Settings Page Styles ===== */
.settings-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    padding: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    width: fit-content;
}

.settings-section {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.settings-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

/* ===== Responsive Adjustments ===== */
@media (max-width: 1200px) {
    .profile-layout {
        grid-template-columns: 250px 1fr;
    }
    
    .contact-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .features-grid,
    .stats-grid,
    .categories-grid,
    .templates-grid,
    .videos-grid {
        grid-template-columns: 1fr;
    }
    
    .profile-layout {
        grid-template-columns: 1fr;
    }
    
    .form-row.multi-col {
        grid-template-columns: 1fr;
    }
    
    .submit-steps {
        flex-wrap: wrap;
        gap: 16px;
    }
    
    .process-steps {
        grid-template-columns: 1fr;
    }
    
    .papers-tabs,
    .videos-tabs,
    .settings-tabs {
        flex-wrap: wrap;
        width: 100%;
    }
}

/* ===== Categories Page Enhanced Styles ===== */

/* 学科分类网格 */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

/* 分类卡片 - 美化升级 */
.category-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.category-card:hover {
    border-color: transparent;
    box-shadow: 0 20px 40px -12px rgba(30, 58, 95, 0.18);
    transform: translateY(-6px);
}

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

/* 图标容器 - 每个科目不同渐变 */
.category-card .category-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 26px;
    margin-bottom: 18px;
    transition: all 0.3s ease;
    box-shadow: 0 8px 20px -4px rgba(0,0,0,0.15);
}

.category-card:hover .category-icon {
    transform: scale(1.1) rotate(-5deg);
}

/* 为不同卡片指定不同颜色 */
.category-card:nth-child(1)  .category-icon { background: linear-gradient(135deg, #2563eb, #1d4ed8); }
.category-card:nth-child(2)  .category-icon { background: linear-gradient(135deg, #0ea5e9, #0284c7); }
.category-card:nth-child(3)  .category-icon { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
.category-card:nth-child(4)  .category-icon { background: linear-gradient(135deg, #ec4899, #db2777); }
.category-card:nth-child(5)  .category-icon { background: linear-gradient(135deg, #f59e0b, #d97706); }
.category-card:nth-child(6)  .category-icon { background: linear-gradient(135deg, #10b981, #059669); }
.category-card:nth-child(7)  .category-icon { background: linear-gradient(135deg, #ef4444, #dc2626); }
.category-card:nth-child(8)  .category-icon { background: linear-gradient(135deg, #6366f1, #4f46e5); }
.category-card:nth-child(9)  .category-icon { background: linear-gradient(135deg, #14b8a6, #0d9488); }
.category-card:nth-child(10) .category-icon { background: linear-gradient(135deg, #84cc16, #65a30d); }
.category-card:nth-child(11) .category-icon { background: linear-gradient(135deg, #22c55e, #16a34a); }
.category-card:nth-child(12) .category-icon { background: linear-gradient(135deg, #06b6d4, #0891b2); }
.category-card:nth-child(13) .category-icon { background: linear-gradient(135deg, #a855f7, #9333ea); }
.category-card:nth-child(14) .category-icon { background: linear-gradient(135deg, #f97316, #ea580c); }
.category-card:nth-child(15) .category-icon { background: linear-gradient(135deg, #3b82f6, #2563eb); }
.category-card:nth-child(16) .category-icon { background: linear-gradient(135deg, #64748b, #475569); }

/* 科目名称 */
.category-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: -0.2px;
}

/* 科目描述 */
.category-card .category-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 14px;
    flex: 1;
}

/* 论文数量 */
.category-card .category-count {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    background: rgba(37, 99, 235, 0.06);
    padding: 6px 12px;
    border-radius: 20px;
    display: inline-block;
    width: fit-content;
    transition: all 0.3s ease;
}

.category-card:hover .category-count {
    background: var(--primary);
    color: #fff;
}

/* 侧边栏卡片 */
.sidebar-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.sidebar-card:hover {
    box-shadow: var(--shadow-md);
}

.sidebar-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-card h3 i {
    color: var(--primary);
    font-size: 18px;
}

/* 统计行 */
.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px dashed var(--border-color);
    transition: all 0.2s ease;
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-row:hover {
    padding-left: 6px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.stat-value {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary);
}

/* 热门学科列表 */
.hot-category-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hot-category-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    cursor: pointer;
}

.hot-category-item:hover {
    background: var(--bg-secondary);
    transform: translateX(4px);
}

.hot-rank {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    flex-shrink: 0;
}

.hot-category-item:nth-child(1) .hot-rank {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #fff;
    box-shadow: 0 4px 10px -2px rgba(251, 191, 36, 0.4);
}

.hot-category-item:nth-child(2) .hot-rank {
    background: linear-gradient(135deg, #94a3b8, #64748b);
    color: #fff;
    box-shadow: 0 4px 10px -2px rgba(148, 163, 184, 0.4);
}

.hot-category-item:nth-child(3) .hot-rank {
    background: linear-gradient(135deg, #b45309, #92400e);
    color: #fff;
    box-shadow: 0 4px 10px -2px rgba(180, 83, 9, 0.4);
}

.hot-cat-info {
    flex: 1;
    min-width: 0;
}

.hot-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.hot-count {
    font-size: 12px;
    color: var(--text-muted);
}

.hot-journal-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

.hot-journal-item:hover .hot-name {
    color: var(--primary);
}

.hot-journal-item:nth-child(1) .hot-rank {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #fff;
    box-shadow: 0 4px 10px -2px rgba(251, 191, 36, 0.4);
}

.hot-journal-item:nth-child(2) .hot-rank {
    background: linear-gradient(135deg, #94a3b8, #64748b);
    color: #fff;
    box-shadow: 0 4px 10px -2px rgba(148, 163, 184, 0.4);
}

.hot-journal-item:nth-child(3) .hot-rank {
    background: linear-gradient(135deg, #b45309, #92400e);
    color: #fff;
    box-shadow: 0 4px 10px -2px rgba(180, 83, 9, 0.4);
}

.hot-journal-info {
    flex: 1;
    min-width: 0;
}

/* 快速导航链接 */
.quick-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.quick-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.quick-link i {
    color: var(--primary);
    font-size: 15px;
    width: 20px;
    text-align: center;
    transition: transform 0.2s ease;
}

.quick-link:hover {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--primary);
    transform: translateX(4px);
}

.quick-link:hover i {
    transform: scale(1.2);
}

/* ===== Page Header ===== */
.page-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 32px 0;
}

.page-header-journals {
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
    border-bottom: none;
    position: relative;
    overflow: hidden;
}

.page-header-journals::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150%;
    height: 150%;
    background: radial-gradient(ellipse at center, rgba(255,255,255,0.4) 0%, rgba(59,130,246,0.3) 30%, transparent 60%);
    transform: translate(-50%, -50%);
    animation: glowPulse 3s ease-in-out infinite;
}

.page-header-journals .about-container {
    position: relative;
    z-index: 2;
}

.page-header-journals .about-container h1,
.page-header-journals .about-container p {
    color: #fff;
}

.page-header-journals .about-container p {
    opacity: 0.9;
}

.about-container {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding-left: 48px;
    text-align: left;
}

.about-container h1 {
    font-size: var(--font-size-4xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.about-container p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .categories-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 16px;
    }
    
    .category-card {
        padding: 20px 16px;
    }
    
    .category-card .category-icon {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }
}

/* ===== Stats Sidebar Components ===== */
.stats-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.stats-sidebar .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 0;
}

.stats-sidebar .stat-box {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.stats-sidebar .stat-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-md);
    font-size: 14px;
    flex-shrink: 0;
}

.stats-sidebar .stat-info {
    min-width: 0;
}

.stats-sidebar .stat-value {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stats-sidebar .stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.2;
}

/* Trending list */
.trending-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.trending-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    cursor: default;
}

.trending-item:hover {
    background: var(--bg-secondary);
}

.trending-rank {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

.trending-item:nth-child(1) .trending-rank {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #fff;
}

.trending-item:nth-child(2) .trending-rank {
    background: linear-gradient(135deg, #94a3b8, #64748b);
    color: #fff;
}

.trending-item:nth-child(3) .trending-rank {
    background: linear-gradient(135deg, #cd7f32, #a0522d);
    color: #fff;
}

.trending-name {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.trending-count {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 600;
    flex-shrink: 0;
}

/* ===== Help Page Styles ===== */

/* 搜索框 */
.help-search {
    margin-bottom: 40px;
}

.search-input-wrap {
    position: relative;
    max-width: 600px;
}

.search-input-wrap i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 18px;
}

.search-input-wrap .search-input {
    width: 100%;
    padding: 14px 16px 14px 48px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.search-input-wrap .search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.search-input-wrap .search-input::placeholder {
    color: var(--text-muted);
}

/* FAQ 分类 */
.faq-section {
    margin-bottom: 40px;
}

.faq-category-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.faq-category-title i {
    color: var(--primary);
    font-size: 20px;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* FAQ 条目 */
.faq-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.faq-item:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

.faq-item.open {
    border-color: var(--primary);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.12);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
    transition: background 0.2s ease;
    gap: 12px;
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-question span {
    flex: 1;
}

.faq-question i {
    color: var(--text-muted);
    font-size: 14px;
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-item.open .faq-question i {
    transform: rotate(180deg);
    color: var(--primary);
}

/* FAQ 答案 */
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    padding: 0 20px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding: 0 20px 18px;
}

.faq-answer p {
    margin-bottom: 10px;
}

.faq-answer ol,
.faq-answer ul {
    margin: 10px 0;
    padding-left: 20px;
}

.faq-answer li {
    margin-bottom: 6px;
}

/* 联系客服 */
.contact-support {
    margin-top: 48px;
    margin-bottom: 48px;
}

.contact-support .section-heading {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-support .section-heading i {
    color: var(--primary);
}

.support-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.support-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    text-align: center;
    transition: all 0.2s ease;
}

.support-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.1);
    transform: translateY(-2px);
}

.support-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(37, 99, 235, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.support-icon i {
    font-size: 22px;
    color: var(--primary);
}

.support-card h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.support-card p {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 6px;
}

.support-time {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* 使用技巧 */
.tips-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.tip-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

.tip-item i {
    color: var(--primary);
    margin-top: 2px;
    font-size: 14px;
    flex-shrink: 0;
}