/* ========================================
   顶级论坛高手资料论坛 - 高手榜资料云社区
   响应式样式表
   更新日期: 2026-02-25
   ======================================== */

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }
    
    .header-container {
        max-width: 1600px;
    }
}

/* Desktop (1200px - 1439px) */
@media (max-width: 1439px) {
    .experts-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Tablet Landscape (992px - 1199px) */
@media (max-width: 1199px) {
    :root {
        --space-24: 5rem;
        --space-20: 4rem;
        --space-16: 3rem;
    }
    
    .header-container {
        padding: 0 var(--space-4);
    }
    
    .nav-link {
        padding: var(--space-2) var(--space-3);
        font-size: var(--font-size-sm);
    }
    
    .experts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-brand {
        grid-column: span 3;
        max-width: 100%;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
}

/* Tablet Portrait (768px - 991px) */
@media (max-width: 991px) {
    :root {
        --space-24: 4rem;
        --space-20: 3.5rem;
        --space-16: 2.5rem;
        --space-12: 2rem;
    }
    
    /* Mobile Navigation */
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        z-index: var(--z-fixed);
        padding: var(--space-6);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }
    
    .main-nav.active {
        transform: translateX(0);
    }
    
    .nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-2);
    }
    
    .nav-link {
        padding: var(--space-4);
        font-size: var(--font-size-lg);
        text-align: center;
        border-radius: var(--radius-lg);
    }
    
    .btn-login {
        display: none;
    }
    
    /* Hero Section */
    .hero-section {
        padding: calc(72px + var(--space-12)) var(--space-4) var(--space-12);
    }
    
    .hero-stats {
        gap: var(--space-8);
    }
    
    .stat-number {
        font-size: var(--font-size-2xl);
    }
    
    /* Categories Grid */
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Experts Grid */
    .experts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
    
    .expert-card.featured {
        grid-column: span 2;
    }
    
    /* Activity Section */
    .activity-wrapper {
        grid-template-columns: 1fr;
    }
    
    .activity-sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
    
    /* Footer */
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-brand {
        grid-column: span 2;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
}

/* Mobile Landscape (576px - 767px) */
@media (max-width: 767px) {
    :root {
        --space-24: 3.5rem;
        --space-20: 3rem;
        --space-16: 2rem;
        --space-12: 1.5rem;
        --space-10: 1.25rem;
        --space-8: 1.5rem;
    }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    /* Hero Section */
    .hero-section {
        min-height: auto;
        padding: calc(72px + var(--space-8)) var(--space-4) var(--space-12);
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-description {
        font-size: var(--font-size-base);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-4);
    }
    
    .stat-item {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: var(--space-2);
    }
    
    .stat-number {
        font-size: var(--font-size-xl);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-actions .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .hero-scroll-indicator {
        display: none;
    }
    
    /* Categories Grid */
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .category-card {
        padding: var(--space-6);
    }
    
    /* Experts Grid */
    .experts-grid {
        grid-template-columns: 1fr;
    }
    
    .expert-card.featured {
        grid-column: span 1;
    }
    
    /* Resources Grid */
    .resources-grid {
        grid-template-columns: 1fr;
    }
    
    /* Activity Section */
    .activity-sidebar {
        grid-template-columns: 1fr;
    }
    
    /* CTA Section */
    .cta-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-actions .btn {
        width: 100%;
        max-width: 280px;
    }
    
    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand {
        grid-column: span 1;
    }
    
    .footer-logo {
        justify-content: center;
    }
    
    .contact-list li {
        justify-content: center;
    }
    
    /* Search Overlay */
    .search-container {
        margin: 0 var(--space-4);
    }
    
    .search-input {
        padding: var(--space-4);
        font-size: var(--font-size-base);
    }
}

/* Mobile Portrait (up to 575px) */
@media (max-width: 575px) {
    :root {
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
        --font-size-xl: 1.125rem;
    }
    
    .logo-text {
        display: none;
    }
    
    .hero-badge {
        font-size: var(--font-size-xs);
    }
    
    .section-header {
        margin-bottom: var(--space-8);
    }
    
    .section-title {
        font-size: var(--font-size-xl);
    }
    
    .section-description {
        font-size: var(--font-size-sm);
    }
    
    .category-card {
        padding: var(--space-5);
    }
    
    .category-icon {
        width: 48px;
        height: 48px;
    }
    
    .expert-card {
        padding: var(--space-4);
    }
    
    .expert-avatar {
        width: 80px;
        height: 80px;
    }
    
    .expert-card.featured .expert-avatar {
        width: 100px;
        height: 100px;
    }
    
    .activity-item {
        padding: var(--space-4);
    }
    
    .activity-icon {
        width: 40px;
        height: 40px;
    }
    
    .activity-icon svg {
        width: 20px;
        height: 20px;
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: var(--space-4);
        right: var(--space-4);
    }
    
    .back-to-top svg {
        width: 20px;
        height: 20px;
    }
}

/* Small Mobile (up to 375px) */
@media (max-width: 375px) {
    .container {
        padding: 0 var(--space-3);
    }
    
    .hero-title {
        font-size: var(--font-size-xl);
    }
    
    .expert-stats {
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .resource-stats {
        flex-direction: column;
        gap: var(--space-2);
    }
}

/* High DPI / Retina Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    img {
        image-rendering: -webkit-optimize-contrast;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f7fafc;
        --text-secondary: #a0aec0;
        --text-muted: #718096;
        --bg-primary: #1a202c;
        --bg-secondary: #171923;
        --bg-dark: #000000;
        --border-color: #2d3748;
    }
    
    .main-header {
        background: rgba(26, 32, 44, 0.95);
        border-bottom-color: var(--border-color);
    }
    
    .hero-section {
        background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
    }
    
    .category-card,
    .expert-card,
    .resource-card,
    .activity-item,
    .sidebar-widget {
        background: #2d3748;
    }
    
    .nav-link:hover,
    .nav-link.active {
        background: rgba(102, 126, 234, 0.2);
    }
    
    .expert-avatar img {
        border-color: #2d3748;
    }
    
    .expert-tags .tag,
    .tag-cloud .tag {
        background: #4a5568;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .hero-scroll-indicator {
        animation: none;
    }
}

/* Print Styles */
@media print {
    .main-header,
    .hero-scroll-indicator,
    .back-to-top,
    .search-overlay,
    .cta-section,
    .footer-social,
    .btn {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
        background: #fff;
    }
    
    .hero-section {
        min-height: auto;
        padding: 2rem 0;
    }
    
    .category-card,
    .expert-card,
    .resource-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    a {
        text-decoration: underline;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        transform: none;
    }
    
    .category-card:hover,
    .expert-card:hover,
    .resource-card:hover {
        transform: none;
    }
    
    .back-to-top:hover {
        transform: translateY(0);
    }
}

/* Landscape Orientation on Mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .hero-section {
        min-height: auto;
        padding: calc(72px + var(--space-4)) var(--space-4) var(--space-8);
    }
    
    .hero-stats {
        flex-direction: row;
        gap: var(--space-6);
    }
    
    .hero-scroll-indicator {
        display: none;
    }
}