:root {
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #6366F1;
    --secondary-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
    --success-color: #10B981;
    --info-color: #3B82F6;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    --radius-sm: 0.25rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-white:hover {
    background: var(--bg-tertiary);
}

.btn-outline-light {
    background: transparent;
    color: white;
    border-color: white;
}

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

.btn-warning {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    color: white;
}

.btn-link {
    background: transparent;
    color: var(--primary-color);
    padding: 0.5rem 0.75rem;
}

.btn-link:hover {
    background: var(--bg-tertiary);
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

.icon-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 1rem;
}

.icon-btn:hover {
    background: var(--bg-tertiary);
}

.header {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-icon {
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

.nav-menu a {
    display: block;
    padding: 0.625rem 1rem;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
    background: rgba(79, 70, 229, 0.1);
}

.nav-actions {
    display: flex;
    gap: 0.75rem;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

main {
    min-height: calc(100vh - 400px);
}

.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.page-header p {
    font-size: 1.125rem;
    opacity: 0.95;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.stats-section {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.stat-card {
    text-align: center;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 1rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.data-trends {
    padding: 4rem 0;
}

.trend-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.trend-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.trend-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.trend-header h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
}

.trend-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
}

.trend-badge.positive {
    background: #D1FAE5;
    color: #065F46;
}

.trend-badge.negative {
    background: #FEE2E2;
    color: #991B1B;
}

.trend-chart {
    height: 200px;
    background: linear-gradient(180deg, rgba(79, 70, 229, 0.1) 0%, rgba(79, 70, 229, 0) 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

.trend-footer {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.875rem;
}

.featured-content {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.content-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.content-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.content-card.featured {
    grid-column: span 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.content-image {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-image {
    font-size: 4rem;
}

.content-card.featured .placeholder-image {
    font-size: 6rem;
}

.content-body {
    padding: 1.5rem;
    position: relative;
}

.content-tag {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.content-body h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

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

.content-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.forum-preview {
    padding: 4rem 0;
}

.forum-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.forum-item {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.forum-item:hover {
    box-shadow: var(--shadow-md);
}

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

.forum-content h4 {
    font-size: 1.125rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.forum-content p {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-size: 0.9375rem;
}

.forum-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

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

.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.cta-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.footer {
    background: var(--text-primary);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.footer-col p {
    color: #9CA3AF;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 0.5rem;
}

.footer-col ul li a {
    color: #9CA3AF;
}

.footer-col ul li a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 0.75rem;
}

.social-links a {
    font-size: 1.5rem;
    transition: var(--transition);
}

.social-links a:hover {
    transform: scale(1.2);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid #374151;
    text-align: center;
    color: #9CA3AF;
}

@media (max-width: 1024px) {
    .stats-grid,
    .trend-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .content-card.featured {
        grid-column: auto;
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu,
    .nav-actions {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .stats-grid,
    .trend-grid {
        grid-template-columns: 1fr;
    }
    
    .forum-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.auth-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-width: 1000px;
    width: 100%;
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.auth-card {
    padding: 3rem;
}

.auth-header {
    margin-bottom: 2rem;
}

.auth-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.auth-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.auth-header p {
    color: var(--text-secondary);
}

.auth-form {
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

.forgot-link {
    color: var(--primary-color);
    font-size: 0.9375rem;
    font-weight: 500;
}

.auth-divider {
    position: relative;
    text-align: center;
    margin: 2rem 0;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
}

.auth-divider span {
    position: relative;
    background: white;
    padding: 0 1rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.social-login {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    background: white;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9375rem;
    font-weight: 500;
}

.social-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

.auth-footer {
    text-align: center;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 600;
}

.auth-side {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    padding: 3rem;
    color: white;
    display: flex;
    align-items: center;
}

.auth-side-content h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
}

.benefits-list {
    list-style: none;
}

.benefits-list li {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.benefit-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.benefits-list strong {
    display: block;
    margin-bottom: 0.25rem;
    font-size: 1.125rem;
}

.benefits-list p {
    font-size: 0.9375rem;
    opacity: 0.9;
}

.forum-page .forum-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    padding: 2rem 0;
}

.forum-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.sidebar-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.sidebar-section h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.category-list {
    list-style: none;
}

.category-list li a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: var(--radius);
    color: var(--text-secondary);
    transition: var(--transition);
}

.category-list li a:hover,
.category-list li.active a {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.category-icon {
    font-size: 1.25rem;
}

.category-list .count {
    margin-left: auto;
    font-size: 0.875rem;
    color: var(--text-light);
}

.hot-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.topic-tag {
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 9999px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.topic-tag:hover {
    background: var(--primary-color);
    color: white;
}

.forum-stats .stat-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.forum-stats .stat-item:last-child {
    border-bottom: none;
}

.forum-stats .label {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.forum-stats .value {
    font-weight: 600;
    color: var(--primary-color);
}

.forum-main {
    min-width: 0;
}

.forum-toolbar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 200px;
    display: flex;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.search-input {
    flex: 1;
    padding: 0.625rem 1rem;
    border: none;
    outline: none;
    font-size: 0.9375rem;
}

.search-btn {
    padding: 0.625rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

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

.filter-select {
    padding: 0.625rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    background: white;
    font-size: 0.9375rem;
    cursor: pointer;
}

.post-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.post-item {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.post-item:hover {
    box-shadow: var(--shadow-md);
}

.post-item.sticky {
    border: 2px solid var(--warning-color);
}

.post-item.hot .post-badge {
    background: linear-gradient(135deg, #EF4444, #DC2626);
}

.post-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.25rem 0.5rem;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.post-avatar {
    flex-shrink: 0;
}

.avatar-placeholder {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

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

.post-title a {
    font-size: 1.125rem;
    color: var(--primary-color);
    font-weight: 600;
    display: block;
    margin-bottom: 0.5rem;
}

.post-excerpt {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--text-light);
}

.post-meta .author {
    color: var(--text-secondary);
    font-weight: 500;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 2rem;
}

.page-item {
    padding: 0.625rem 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius);
    color: var(--text-secondary);
    transition: var(--transition);
}

.page-item:hover,
.page-item.active {
    background: var(--primary-color);
    color: white;
}

.analysis-page .analysis-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-group label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.data-selector,
.time-selector,
.chart-type-selector {
    padding: 0.625rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    background: white;
    font-size: 0.9375rem;
    cursor: pointer;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.dashboard-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.dashboard-card.full-width {
    grid-column: span 2;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.card-header h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
}

.card-actions {
    display: flex;
    gap: 0.5rem;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
    display: flex;
    gap: 2rem;
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric-label {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.25rem;
}

.metric-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.metric-value.positive {
    color: var(--success-color);
}

.metric-value.negative {
    color: var(--danger-color);
}

.metric-value.warning {
    color: var(--warning-color);
}

.chart-container {
    height: 300px;
    background: linear-gradient(180deg, rgba(79, 70, 229, 0.05) 0%, rgba(79, 70, 229, 0) 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

.chart-legend {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.kpi-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.kpi-icon {
    font-size: 2rem;
}

.kpi-content {
    flex: 1;
}

.kpi-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.kpi-label {
    font-size: 0.875rem;
    color: var(--text-light);
}

.kpi-trend {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--success-color);
}

.region-table {
    margin-top: 1.5rem;
    overflow-x: auto;
}

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

.region-table th,
.region-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

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

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

.data-sources {
    margin-top: 3rem;
    text-align: center;
}

.data-sources h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.source-list {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.source-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.source-icon {
    font-size: 1.5rem;
}

.prediction-page .prediction-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.prediction-dashboard {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.dashboard-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.model-selector,
.parameter-panel {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.model-selector h3,
.parameter-panel h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.model-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.model-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    background: white;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9375rem;
}

.model-btn:hover,
.model-btn.active {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary-color);
}

.model-icon {
    font-size: 1.25rem;
}

.parameter-panel .form-group {
    margin-bottom: 1rem;
}

.form-range {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
}

.range-value {
    text-align: center;
    margin-top: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.prediction-result {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.result-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.result-actions {
    display: flex;
    gap: 0.75rem;
}

.prediction-chart {
    height: 400px;
    background: linear-gradient(180deg, rgba(79, 70, 229, 0.05) 0%, rgba(79, 70, 229, 0) 100%);
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

.prediction-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.metric-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    text-align: center;
}

.metric-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.metric-detail {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.prediction-insights {
    margin-bottom: 2rem;
}

.prediction-insights h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.insight-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.insight-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border-left: 4px solid var(--info-color);
}

.insight-item.positive {
    border-left-color: var(--success-color);
}

.insight-item.warning {
    border-left-color: var(--warning-color);
}

.insight-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.insight-content strong {
    display: block;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.insight-content p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.recommendation-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.recommendation-item {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 2px solid transparent;
    transition: var(--transition);
}

.recommendation-item:hover {
    border-color: var(--primary-color);
}

.rec-rank {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    margin-bottom: 1rem;
}

.rec-content h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.rec-content p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 0.75rem;
}

.rec-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.8125rem;
}

.rec-meta span {
    padding: 0.25rem 0.5rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

.model-performance,
.use-cases {
    margin-top: 3rem;
}

.model-performance h2,
.use-cases h2 {
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.performance-grid,
.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.performance-card,
.case-card {
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.performance-card:hover,
.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.performance-card h4,
.case-card h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.performance-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 4px;
    transition: width 1s ease;
}

.performance-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.case-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.case-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.user-page .user-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    padding: 2rem 0;
}

.user-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.user-profile-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.profile-avatar {
    margin-bottom: 1rem;
}

.profile-avatar .avatar-placeholder {
    width: 80px;
    height: 80px;
    margin: 0 auto;
    font-size: 2.5rem;
}

.user-profile-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.profile-level {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.profile-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.profile-stat {
    display: flex;
    flex-direction: column;
}

.profile-stat .stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

.user-menu {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

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

.user-menu-item .badge {
    margin-left: auto;
    padding: 0.125rem 0.5rem;
    background: var(--danger-color);
    color: white;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.user-vip-card {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    color: white;
    text-align: center;
}

.user-vip-card h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.user-vip-card p {
    font-size: 0.9375rem;
    opacity: 0.9;
    margin-bottom: 1rem;
}

.user-main {
    min-width: 0;
}

.user-content-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.profile-form .form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.tags-input {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    min-height: 46px;
    padding: 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
}

.tags-input .tag {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.tags-input .tag button {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    color: var(--text-light);
    font-size: 1rem;
}

.tags-input input {
    flex: 1;
    min-width: 100px;
    border: none;
    outline: none;
    font-size: 0.9375rem;
}

.activity-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.activity-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.activity-icon {
    font-size: 2.5rem;
}

.activity-trend {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--success-color);
    margin-left: auto;
}

.recent-posts,
.favorites-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.post-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    transition: var(--transition);
}

.post-row:hover {
    background: var(--bg-tertiary);
}

.post-row-content h4 a {
    color: var(--primary-color);
    font-size: 1rem;
}

.post-row-meta {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.post-row-stats {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-light);
    flex-shrink: 0;
}

.favorite-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.favorite-card h4 a {
    color: var(--primary-color);
    font-size: 1rem;
    display: block;
    margin-bottom: 0.5rem;
}

.favorite-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 0.75rem;
}

.favorite-meta {
    font-size: 0.875rem;
    color: var(--text-light);
}

.notifications-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.notification-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    transition: var(--transition);
}

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

.notification-item.unread {
    background: rgba(79, 70, 229, 0.1);
    border-left: 3px solid var(--primary-color);
}

.notification-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.notification-content p {
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.notification-excerpt {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.notification-time {
    font-size: 0.8125rem;
    color: var(--text-light);
    margin-top: 0.5rem;
    display: block;
}

@media (max-width: 1024px) {
    .auth-container {
        grid-template-columns: 1fr;
    }
    
    .auth-side {
        display: none;
    }
    
    .forum-page .forum-layout,
    .prediction-dashboard,
    .user-page .user-layout {
        grid-template-columns: 1fr;
    }
    
    .forum-sidebar,
    .user-sidebar {
        position: static;
    }
    
    .dashboard-grid,
    .prediction-metrics,
    .performance-grid,
    .cases-grid,
    .activity-stats-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-card.full-width {
        grid-column: auto;
    }
    
    .recommendation-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .profile-form .form-row {
        grid-template-columns: 1fr;
    }
    
    .hero-actions,
    .cta-actions {
        flex-direction: column;
    }
    
    .content-grid,
    .trend-grid {
        grid-template-columns: 1fr;
    }
}