/* 响应式设计样式 */

/* 平板样式 (768px - 1024px) */
@media (max-width: 1024px) {
    .container {
        padding: 0 16px;
    }

    .section {
        padding: 60px 0;
    }

    .hero {
        padding: 100px 0;
    }

    .hero-title {
        font-size: 3rem;
    }

    .feature-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 24px;
    }

    .footer-container {
        gap: 32px;
    }
}

/* 平板垂直样式 (768px 及以下) */
@media (max-width: 768px) {
    :root {
        --border-radius: 6px;
        --border-radius-lg: 10px;
    }

    html {
        font-size: 14px;
    }

    .container {
        padding: 0 12px;
    }

    .section {
        padding: 40px 0;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: 12px;
    }

    .section-subtitle {
        font-size: 1rem;
        margin-bottom: 32px;
    }

    /* 导航栏 */
    .nav-container {
        padding: 0 12px;
        height: 56px;
        position: relative;
    }

    .nav-brand .brand-text {
        display: none;
    }

    /* 移动端中心显示网站名称 */
    .mobile-brand-center {
        display: flex;
        align-items: center;
        justify-content: center;
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        z-index: 1;
    }

    .mobile-brand-text {
        font-size: 1rem;
        font-weight: 600;
        color: var(--text-primary);
    }

    /* 移动端隐藏登录/注册按钮和用户菜单 */
    .nav-actions .btn,
    .nav-actions .user-menu {
        display: none;
    }

    /* 移动端只显示主题切换和菜单按钮 */
    .nav-actions {
        gap: 8px;
        margin-left: auto;
    }

    .btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    /* 移动端菜单 */
    .mobile-menu {
        width: 280px;
        right: -280px;
    }

    /* 英雄区域 */
    .hero {
        padding: 80px 0;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
        max-width: 300px;
        margin: 0 auto;
    }

    .hero-actions .btn {
        justify-content: center;
        padding: 12px 24px;
    }

    /* 功能卡片 */
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 32px;
    }

    .feature-card {
        padding: 24px 20px;
    }

    .feature-icon {
        width: 56px;
        height: 56px;
        font-size: 1.25rem;
        margin-bottom: 16px;
    }

    .feature-title {
        font-size: 1.1rem;
    }

    /* 压缩工具 */
    .tool-container {
        max-width: 100%;
    }

    .upload-area {
        padding: 32px 20px;
        margin-bottom: 24px;
    }

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

    .upload-text {
        font-size: 1rem;
    }

    .upload-options {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 24px;
    }

    .upload-option {
        padding: 10px 20px;
    }

    .compression-settings {
        padding: 20px;
        margin-bottom: 24px;
    }

    .compression-modes {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .compression-mode {
        padding: 16px;
    }

    /* 结果展示 */
    .results-container {
        padding: 24px 20px;
        margin-top: 24px;
    }

    .results-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-bottom: 24px;
    }

    .result-item {
        max-width: 100%;
    }

    .result-stats {
        grid-template-columns: 1fr;
        gap: 8px;
    }

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

    .result-actions .btn {
        justify-content: center;
    }

    /* 页脚 */
    .footer-container {
        padding: 48px 16px 24px;
    }

    .footer-main {
        grid-template-columns: 1fr;
        gap: 40px;
        margin-bottom: 40px;
    }

    .footer-section {
        margin-bottom: 0;
        text-align: center;
    }

    .footer-brand {
        max-width: 100%;
    }

    .footer-brand-content {
        align-items: center;
    }

    .footer-title {
        font-size: 1.125rem;
    }

    .footer-title::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .footer-description {
        text-align: center;
        max-width: 500px;
        margin: 0 auto;
    }

    .footer-features {
        justify-content: center;
        margin-top: 16px;
    }

    .footer-links {
        align-items: center;
    }

    .footer-links a {
        justify-content: center;
    }

    .footer-stats-card {
        max-width: 280px;
        margin: 16px auto 0;
    }

    .stat-item {
        flex-direction: row;
        justify-content: center;
    }

    .footer-bottom-container {
        padding: 0 16px;
    }

    /* 返回顶部按钮 */
    .back-to-top {
        bottom: 16px;
        right: 16px;
        width: 44px;
        height: 44px;
    }
    
    .back-to-top i {
        font-size: 1.1rem;
    }
    
    /* 核心卖点标识移动端 */
    .selling-points {
        gap: 0.5rem;
        padding: 0.45rem 0.75rem;
        margin: 0.875rem 0;
        border-radius: 45px;
    }
    
    .selling-point-item {
        padding: 0.4rem 0.65rem;
        gap: 0.35rem;
        border-radius: 22px;
    }
    
    .selling-point-item i {
        font-size: 0.85rem;
    }
    
    .selling-point-item .selling-point-text {
        font-size: 0.7rem;
        letter-spacing: 0.3px;
    }
}

/* 小屏幕手机 (480px 及以下) */
@media (max-width: 480px) {
    html {
        font-size: 13px;
    }

    .container {
        padding: 0 8px;
    }

    .section {
        padding: 32px 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
    }

    /* 导航栏 */
    .nav-container {
        padding: 0 8px;
        height: 52px;
    }

    /* 英雄区域 */
    .hero {
        padding: 60px 0;
    }

    .hero-title {
        font-size: 2rem;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 24px;
    }

    /* 功能卡片 */
    .feature-card {
        padding: 20px 16px;
    }

    /* 压缩工具 */
    .upload-area {
        padding: 24px 16px;
    }

    .upload-icon {
        font-size: 2rem;
        margin-bottom: 12px;
    }

    .compression-settings {
        padding: 16px;
    }

    /* 结果展示 */
    .results-container {
        padding: 20px 16px;
    }

    .result-info {
        padding: 12px;
    }

    /* 页脚 */
    .footer-container {
        padding: 40px 12px 20px;
    }

    .footer-main {
        gap: 32px;
        margin-bottom: 32px;
    }

    .footer-section {
        margin-bottom: 0;
    }

    .footer-title {
        font-size: 1.0625rem;
        padding-bottom: 10px;
    }

    .footer-description {
        font-size: 0.875rem;
    }

    .footer-features {
        gap: 12px;
        margin-top: 12px;
    }

    .footer-feature-item {
        padding: 6px 12px;
        font-size: 0.8125rem;
    }

    .footer-feature-item i {
        font-size: 0.85rem;
    }

    .footer-links {
        gap: 10px;
    }

    .footer-links a {
        font-size: 0.9rem;
        padding: 6px 0;
    }

    .footer-stats-card {
        padding: 16px;
        max-width: 100%;
    }

    .stat-icon-wrapper {
        width: 44px;
        height: 44px;
        font-size: 1.125rem;
    }

    .stat-number {
        font-size: 1.375rem;
    }

    .stat-label {
        font-size: 0.75rem;
    }

    .footer-bottom {
        padding-top: 24px;
    }

    .footer-bottom-container {
        padding: 0 12px;
    }

    .footer-copyright {
        gap: 10px;
    }

    .copyright-text {
        font-size: 0.8125rem;
    }

    .footer-links-inline {
        gap: 10px;
    }

    .footer-links-inline a {
        font-size: 0.8125rem;
    }
    
    /* 核心卖点标识小屏幕 */
    .selling-points {
        gap: 0.4rem;
        padding: 0.4rem 0.65rem;
        margin: 0.75rem 0;
        flex-direction: row;
        flex-wrap: wrap;
        border-radius: 35px;
    }
    
    .selling-point-item {
        padding: 0.35rem 0.55rem;
        width: auto;
        flex: 1;
        min-width: 0;
        justify-content: center;
        border-radius: 18px;
    }
    
    .selling-point-item i {
        font-size: 0.8rem;
    }
    
    .selling-point-item .selling-point-text {
        font-size: 0.65rem;
        letter-spacing: 0.2px;
    }
    
    /* 返回顶部按钮小屏幕 */
    .back-to-top {
        bottom: 12px;
        right: 12px;
        width: 40px;
        height: 40px;
    }
    
    .back-to-top i {
        font-size: 1rem;
    }
}

/* 超小屏幕 (360px 及以下) */
@media (max-width: 360px) {
    .nav-brand .brand-link {
        font-size: 1.1rem;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .feature-title {
        font-size: 1rem;
    }

    .upload-text {
        font-size: 0.9rem;
    }

    .footer-stats {
        display: none; /* 在超小屏幕上隐藏统计信息 */
    }
}

/* 横屏手机优化 */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        padding: 40px 0;
    }

    .hero-title {
        font-size: 2rem;
        margin-bottom: 8px;
    }

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 16px;
    }

    .section {
        padding: 24px 0;
    }

    .feature-card {
        padding: 16px;
    }
}

/* 高分辨率屏幕优化 */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }

    .hero-title {
        font-size: 4rem;
    }

    .section-title {
        font-size: 3rem;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .nav-link,
    .btn,
    .upload-option,
    .compression-mode,
    .user-menu-trigger {
        min-height: 44px; /* iOS 推荐的最小触摸目标 */
        padding: 12px 16px;
    }

    .tooltip {
        display: none; /* 在触摸设备上禁用工具提示 */
    }
}

/* 打印样式 */
@media print {
    .header,
    .footer,
    .back-to-top,
    .mobile-menu,
    .nav-actions,
    .selling-points {
        display: none !important;
    }

    .main-content {
        min-height: auto;
    }

    .section {
        page-break-inside: avoid;
    }

    .feature-card,
    .result-item {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* 深色模式媒体查询 */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #0f172a;
        --surface-color: #1e293b;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --border-color: #334155;
    }
}

/* 减少动画偏好 */
@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;
    }

    .loading-spinner {
        animation: none;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0066cc;
        --text-primary: var(--text-primary);
        --background-color: var(--background-color);
        --border-color: var(--border-color);
    }
    
    [data-theme="dark"] {
        --primary-color: #60a5fa;
        --text-primary: var(--text-primary);
        --background-color: var(--background-color);
        --border-color: var(--border-color);
    }

    .feature-icon {
        background: var(--primary-color);
        color: #ffffff;
    }
}

/* 屏幕阅读器优化 */
@media (max-width: 1px) {
    .skip-link {
        position: static;
        width: auto;
        height: auto;
        padding: 0;
        background: transparent;
        color: var(--primary-color);
        text-decoration: underline;
    }
}