/* ==========================================
   响应式设计
   ========================================== */

/* 平板设备 */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero-stats {
        gap: 2rem;
    }

    .forum-layout {
        grid-template-columns: 1fr;
    }

    .forum-sidebar {
        position: static;
    }

    .product-detail {
        grid-template-columns: 1fr;
    }

    .product-gallery {
        position: static;
    }

    .profile-layout {
        grid-template-columns: 1fr;
    }

    .profile-sidebar {
        position: static;
    }

    .messages-layout {
        grid-template-columns: 1fr;
    }

    .messages-list {
        display: none;
    }

    .messages-list.show {
        display: block;
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        width: 100%;
        z-index: 10;
    }

    .checkout-layout {
        grid-template-columns: 1fr;
    }

    .checkout-summary {
        position: static;
    }

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

    .settings-layout {
        grid-template-columns: 1fr;
    }

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

    .settings-nav {
        position: static;
        display: flex;
        overflow-x: auto;
        gap: 0.25rem;
        padding-bottom: 0.5rem;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .settings-nav a {
        white-space: nowrap;
        border-right: none;
        border-bottom: 2px solid transparent;
    }

    .settings-nav a.active {
        border-right: none;
        border-bottom-color: var(--primary-color);
    }

    .settings-body {
        padding: 1.25rem;
    }

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

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

/* 移动设备 */
@media (max-width: 768px) {
    /* 导航栏 */
    .navbar {
        padding: 0 1rem;
        height: 3rem;
    }

    .nav-search {
        display: none;
        position: fixed;
        top: 3rem;
        left: 0;
        right: 0;
        padding: 0.75rem 1rem;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        z-index: 999;
        max-width: none;
        margin: 0;
    }

    .nav-search.show {
        display: flex;
    }

    .nav-menu {
        display: none;
        position: fixed;
        top: 3rem;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        z-index: 998;
        box-shadow: var(--shadow-lg);
    }

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

    .nav-links {
        flex-direction: column;
        padding: 0.5rem;
    }

    .nav-links a {
        padding: 0.75rem 1rem;
    }

    .nav-toggle {
        display: flex;
    }

    .user-actions {
        display: none;
    }

    .user-actions.show {
        display: flex;
        position: fixed;
        top: calc(3rem + 50px);
        left: 0;
        right: 0;
        padding: 0.75rem 1rem;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        z-index: 997;
        justify-content: center;
    }

    /* 英雄区域 */
    .hero {
        padding: 2.5rem 1rem;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 0.875rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }

    .hero-buttons .btn {
        padding: 0.625rem 1.25rem;
        font-size: 0.875rem;
    }

    .hero-stats {
        gap: 1.5rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero-stat-value {
        font-size: 1.25rem;
    }

    /* 区块 */
    .section {
        padding: 2rem 0;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    /* 帖子/商品/用户网格 */
    .posts-grid {
        grid-template-columns: 1fr;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .users-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    /* 页脚 */
    .footer {
        padding: 2rem 0 1rem;
        margin-top: 2rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    /* 模态框 */
    .modal {
        padding: 1rem 0.5rem;
    }

    .modal-content {
        padding: 1.5rem;
        max-width: none;
    }

    /* 管理后台 */
    .admin-sidebar {
        transform: translateX(-100%);
    }

    .admin-sidebar.show {
        transform: translateX(0);
    }

    .admin-main {
        margin-left: 0;
    }

    .admin-content {
        padding: 1rem;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
    }

    .quick-actions {
        grid-template-columns: 1fr 1fr;
    }

    .welcome-banner .welcome-stats {
        gap: 1rem;
    }

    .welcome-banner {
        padding: 1.5rem;
    }

    .welcome-banner h2 {
        font-size: 1.25rem;
    }

    /* 论坛过滤器 */
    .forum-filters {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.5rem;
    }

    /* 帖子详情 */
    .post-detail-content {
        padding: 1.25rem;
    }

    .post-detail-content .post-images {
        grid-template-columns: 1fr 1fr;
    }

    /* 设置 */
    .settings-nav {
        flex-wrap: nowrap;
    }
}

/* 小型移动设备 */
@media (max-width: 480px) {
    .navbar {
        padding: 0 0.75rem;
    }

    .nav-brand a {
        font-size: 1rem;
    }

    .hero {
        padding: 2rem 0.75rem;
    }

    .hero h1 {
        font-size: 1.25rem;
    }

    .hero p {
        font-size: 0.8125rem;
    }

    .products-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    .product-info {
        padding: 0.625rem;
    }

    .product-title {
        font-size: 0.8125rem;
    }

    .product-price {
        font-size: 1rem;
    }

    .product-actions {
        flex-direction: column;
    }

    .product-actions .btn {
        font-size: 0.75rem;
    }

    .users-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    .user-card {
        padding: 1rem;
    }

    .user-card img {
        width: 3rem;
        height: 3rem;
    }

    .user-stats {
        gap: 0.75rem;
    }

    .post-card {
        padding: 1rem;
    }

    .order-item {
        flex-direction: column;
    }

    .order-image {
        width: 100%;
        height: 120px;
    }

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

    .quick-actions {
        grid-template-columns: 1fr;
    }

    .welcome-banner .welcome-stats {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .admin-table {
        font-size: 0.75rem;
    }

    .admin-table th,
    .admin-table td {
        padding: 0.5rem 0.75rem;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .btn {
        min-height: 44px;
        min-width: 44px;
    }

    .nav-links a {
        min-height: 44px;
    }

    .post-action {
        min-height: 44px;
        min-width: 44px;
    }

    .social-btn {
        min-height: 44px;
    }
}

/* 打印样式 */
@media print {
    .header,
    .footer,
    .nav-toggle,
    .nav-search,
    .modal,
    .notification,
    .admin-sidebar {
        display: none !important;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
        background: #fff;
    }

    .hero {
        background: #f0f0f0 !important;
        color: #000 !important;
    }

    a {
        text-decoration: underline;
        color: #000;
    }

    .btn {
        border: 1px solid #000;
        background: #fff;
        color: #000;
    }

    .admin-main {
        margin-left: 0;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000;
        --text-primary: #000;
        --text-secondary: #333;
        --bg-primary: #fff;
        --bg-secondary: #f0f0f0;
    }

    .btn-primary {
        background-color: #000;
        color: #fff;
    }

    .btn-outline {
        border: 2px solid #000;
    }
}

/* 减少动画 */
@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;
    }
}

/* 大屏幕 */
@media (min-width: 1400px) {
    .posts-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .products-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}