/* ============================================================
   Responsive Styles - 现代化响应式设计
   ============================================================ */

/* ===== Breakpoints =====
   - Mobile: < 768px
   - Tablet: 768px - 1024px
   - Desktop: 1024px - 1280px
   - Widescreen: > 1280px
============================================ */

/* ===== Mobile First (Base) ===== */

/* ===== Small Mobile (< 400px) ===== */
@media screen and (max-width: 400px) {
    html {
        font-size: 13px;
    }

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

    /* Hero Section */
    .hero-section {
        padding: var(--space-lg) 0;
    }

    .hero-main .hero-title {
        font-size: var(--font-size-lg) !important;
    }

    .hero-main .hero-overlay {
        padding: 40px 16px 16px !important;
    }

    /* Article Card */
    .article-card-content {
        padding: var(--space-md);
    }

    .article-card-title {
        font-size: var(--font-size-sm);
    }

    /* Widget */
    .widget-box {
        padding: var(--space-md);
    }
}

/* ===== Mobile (< 768px) ===== */
@media screen and (max-width: 768px) {
    /* Typography */
    html {
        font-size: 14px;
    }

    h1 { font-size: var(--font-size-2xl); }
    h2 { font-size: var(--font-size-xl); }
    h3 { font-size: var(--font-size-lg); }

    /* Container */
    .container {
        padding: 0 var(--space-md);
    }

    /* Section */
    .section {
        padding: var(--space-xl) 0;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
        padding: 0 var(--space-sm);
    }

    .section-title {
        font-size: var(--font-size-lg);
    }

    /* Grid to Single Column */
    .content-grid,
    .article-layout {
        grid-template-columns: 1fr !important;
    }

    /* Article Grid */
    .article-grid,
    .recommend-grid,
    .recommend-grid-lg,
    .category-grid {
        grid-template-columns: 1fr !important;
    }

    /* Hero Section */
    .hero-section {
        padding: var(--space-lg) 0;
        margin-bottom: var(--space-lg);
    }

    .hero-grid {
        grid-template-columns: 1fr !important;
    }

    .hero-main {
        min-height: 250px !important;
    }

    .hero-main .hero-title {
        font-size: var(--font-size-xl) !important;
    }

    .hero-main .hero-overlay {
        padding: 60px 20px 20px !important;
    }

    .hero-side {
        display: none !important;
    }

    /* Article Hero */
    .article-hero {
        height: 280px !important;
    }

    .article-hero .hero-title {
        font-size: var(--font-size-xl) !important;
    }

    .article-hero .hero-meta {
        flex-wrap: wrap;
        gap: var(--space-sm) !important;
    }

    /* Article Container */
    .article-container {
        margin-top: -30px !important;
        padding: var(--space-lg) 0 var(--space-xl) !important;
    }

    .article-detail {
        padding: var(--space-md) !important;
        border-radius: var(--border-radius) !important;
    }

    .article-title {
        font-size: var(--font-size-xl) !important;
    }

    .article-content {
        font-size: var(--font-size-base) !important;
    }

    /* Article Navigation - 手机端横向紧凑布局 */
    .article-nav {
        grid-template-columns: 1fr 1fr !important;
        gap: var(--space-sm) !important;
    }

    .article-nav-item {
        padding: var(--space-md) var(--space-sm) !important;
    }

    .article-nav-item .nav-label {
        font-size: 11px !important;
        margin-bottom: 4px !important;
    }

    .article-nav-item .nav-title {
        font-size: var(--font-size-sm) !important;
        -webkit-line-clamp: 1 !important;
        word-break: break-all;
    }

    /* Sidebar */
    .content-sidebar,
    .article-sidebar {
        position: static !important;
        display: flex;
        flex-direction: column;
        gap: var(--space-lg);
        margin-top: var(--space-xl);
    }

    /* Widget Box */
    .widget-box {
        margin-bottom: 0;
    }

    /* Tags */
    .article-tags {
        flex-direction: column;
        align-items: flex-start;
    }

    .tags-list {
        width: 100%;
    }

    /* Popular List */
    .popular-item {
        padding: var(--space-sm);
    }

    /* Category List */
    .category-list-item {
        padding: var(--space-sm) var(--space-md);
    }

    /* Hide on Mobile */
    .hide-mobile {
        display: none !important;
    }

    /* Breadcrumb */
    .breadcrumb-nav {
        font-size: var(--font-size-xs);
    }

    /* Footer */
    .site-footer .footer-grid {
        grid-template-columns: 1fr !important;
        text-align: center;
    }

    .site-footer .footer-section {
        margin-bottom: var(--space-lg);
    }

    /* Back to Top */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
}

/* ===== Tablet (768px - 1024px) ===== */
@media screen and (min-width: 768px) and (max-width: 1024px) {
    /* Two Column Layout */
    .content-grid {
        grid-template-columns: 1fr !important;
    }

    .article-layout {
        grid-template-columns: 1fr !important;
    }

    /* Article Grid - 2 columns */
    .article-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }

    .category-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }

    .recommend-grid-lg {
        grid-template-columns: repeat(2, 1fr) !important;
    }

    /* Hero Grid */
    .hero-grid {
        grid-template-columns: 1.5fr 1fr !important;
    }

    /* Sidebar - Horizontal layout */
    .content-sidebar,
    .article-sidebar {
        position: static !important;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
        margin-top: var(--space-xl);
    }

    /* Article Hero */
    .article-hero {
        height: 350px;
    }
}

/* ===== Desktop (1024px - 1280px) ===== */
@media screen and (min-width: 1024px) and (max-width: 1280px) {
    .container {
        max-width: 1024px;
    }

    /* Grid Layout */
    .content-grid {
        grid-template-columns: 1fr 300px;
    }

    .article-layout {
        grid-template-columns: 1fr 300px;
    }

    /* Category Grid - 2 columns */
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===== Widescreen (> 1280px) ===== */
@media screen and (min-width: 1280px) {
    .container {
        max-width: 1200px;
    }
}

/* ===== Large Screen (> 1440px) ===== */
@media screen and (min-width: 1440px) {
    .container {
        max-width: 1320px;
    }
}

/* ===== Hover Effects - Desktop Only ===== */
@media (hover: hover) and (pointer: fine) {
    .article-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-card-hover);
    }

    .article-card-mini:hover {
        transform: translateX(4px);
        background: var(--bg-hover);
    }

    .hero-side-item:hover {
        background: rgba(255, 255, 255, 0.2);
        transform: translateX(-4px);
    }

    .tag-item:hover {
        background: var(--gradient-primary);
        color: white;
        transform: scale(1.05);
    }

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

    .category-list-item:hover {
        background: var(--bg-hover);
        color: var(--color-primary);
    }
}

/* ===== Touch Device Optimizations ===== */
@media (hover: none) and (pointer: coarse) {
    /* Remove hover effects */
    .article-card:hover,
    .article-card-mini:hover {
        transform: none;
        box-shadow: var(--shadow-card);
    }

    /* Larger touch targets */
    .tag-item,
    .btn,
    .btn-icon,
    .popular-item,
    .category-list-item {
        min-height: 44px;
    }

    .tag-item {
        padding: 10px 16px;
    }

    /* Better tap feedback */
    .article-card:active,
    .article-card-mini:active {
        transform: scale(0.98);
    }
}

/* ===== Landscape Mobile ===== */
@media screen and (max-width: 900px) and (orientation: landscape) {
    .hero-main {
        min-height: 200px !important;
    }

    .article-hero {
        height: 250px !important;
    }
}

/* ===== High DPI Screens ===== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    /* Sharper borders */
    .article-card,
    .widget-box,
    .article-detail {
        border-width: 0.5px;
    }
}

/* ===== Safe Area Insets (Notch Phones) ===== */
@supports (padding: max(0px)) {
    .site-navbar {
        padding-left: max(var(--space-lg), env(safe-area-inset-left));
        padding-right: max(var(--space-lg), env(safe-area-inset-right));
    }

    .site-footer {
        padding-bottom: max(var(--space-xl), env(safe-area-inset-bottom));
    }

    .container {
        padding-left: max(var(--space-md), env(safe-area-inset-left));
        padding-right: max(var(--space-md), env(safe-area-inset-right));
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ===== Print Styles ===== */
@media print {
    .site-navbar,
    .site-footer,
    .sidebar,
    .content-sidebar,
    .article-sidebar,
    .back-to-top,
    .article-nav,
    .recommend-section {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .article-detail {
        box-shadow: none;
        padding: 0;
    }

    .article-content {
        font-size: 12pt;
        line-height: 1.5;
    }

    a {
        color: black;
        text-decoration: underline;
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}

/* ===== Dark Mode System Preference ===== */
@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) {
        --bg-body: #0f172a;
        --bg-card: #1e293b;
        --bg-card-hover: #334155;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #64748b;
        --border-color: #334155;
    }
}

/* ===== Utility Classes for Responsive ===== */
.hide-mobile {
    display: block;
}

.show-mobile {
    display: none;
}

@media screen and (max-width: 768px) {
    .hide-mobile {
        display: none !important;
    }

    .show-mobile {
        display: block !important;
    }
}

.hide-tablet {
    display: block;
}

.show-tablet {
    display: none;
}

@media screen and (min-width: 768px) and (max-width: 1024px) {
    .hide-tablet {
        display: none !important;
    }

    .show-tablet {
        display: block !important;
    }
}

.hide-desktop {
    display: block;
}

.show-desktop {
    display: none;
}

@media screen and (min-width: 1024px) {
    .hide-desktop {
        display: none !important;
    }

    .show-desktop {
        display: block !important;
    }
}