/*
 * ============================================
 * Responsive Styles - 响应式样式文件
 * ============================================
 *
 * 此文件包含所有响应式 CSS 媒体查询
 * This file contains all responsive CSS media queries
 *
 * 断点说明 (Breakpoints):
 * - Desktop:  >= 1024px
 * - Tablet:   >= 768px and < 1024px
 * - Mobile:   < 768px
 * - Small Mobile: < 480px
 *
 * 提取自 (Extracted from): frontend/index.html
 * 最后更新 (Last Updated): 2025-12-19
 * ============================================
 */

/* ============================================
 * 移动端浮动按钮样式
 * Mobile Floating Button Styles
 * ============================================ */
@media (max-width: 768px) {
    .blog-esim-float {
        bottom: 70px;
        right: 12px;
        padding: 12px 18px;
    }
    .blog-esim-float .float-text {
        font-size: 0.85rem;
    }
}

/* ============================================
 * 轮播图响应式布局
 * Carousel Responsive Layout
 * ============================================ */

/* 平板端：每行显示 2 个项目 (Tablet: 2 items per row) */
@media (min-width: 768px) {
    .carousel-slide {
        flex: 0 0 50%;
    }
}

/* 桌面端：每行显示 3 个项目 (Desktop: 3 items per row) */
@media (min-width: 1024px) {
    .carousel-slide {
        flex: 0 0 33.3333%;
    }
}

/* 移动端：隐藏轮播导航按钮 (Mobile: Hide carousel navigation buttons) */
@media (max-width: 768px) {
    .carousel-btn {
        display: none;
    }
}

/* ============================================
 * 平板端响应式样式 (max-width: 1024px)
 * Tablet Responsive Styles
 * ============================================ */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 3.5rem;
    }
    .packages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    /* .testimonial-grid { grid-template-columns: 1fr; }  Removed grid */
    .steps-container {
        flex-direction: column;
        gap: 40px;
        margin-top: 20px;
    }
    .steps-container::before {
        width: 2px;
        height: 100%;
        left: 50%;
        top: 0;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .blob-1, .blob-2 {
        width: 300px;
        height: 300px;
    }
}

/* ============================================
 * 移动端响应式样式 (max-width: 768px)
 * Mobile Responsive Styles
 * ============================================ */
@media (max-width: 768px) {
    /* 导航栏优化 (Navigation Optimization) */
    .nav-menu,
    .nav-actions .btn,
    .nav-actions .lang-select {
        display: none !important;
    }
    .mobile-toggle {
        display: block;
    }
    /* 移动端让 nav-actions 和 mobile-toggle 靠近但不误触 */
    .nav-inner {
        gap: 16px;
    }
    .nav-actions {
        gap: 8px;
        margin-left: auto;
    }
    .user-avatar {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }
    .mobile-toggle {
        font-size: 1.4rem;
    }

    /* Hero 区域优化 (Hero Section Optimization) */
    .hero {
        height: auto;
        padding: 100px 0 50px;
    }
    .hero h1 {
        font-size: 2.5rem;
    }

    /* 网格布局优化 (Grid Layout Optimization) */
    .packages-grid {
        grid-template-columns: 1fr;
    }
    .blog-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        margin-bottom: 20px;
    }

    /* 页面间距优化 (Spacing Optimization) */
    footer {
        padding: 30px 0 15px;
        margin-top: 30px;
    }
    .section {
        padding: 40px 0;
    }
    .section-header {
        margin-bottom: 35px;
    }
    .page-section {
        padding-top: 40px;
    }

    /* 关于页面优化 (About Page Optimization) */
    #about.page-section {
        padding: 110px 0 25px !important;
        min-height: auto !important;
    }
    .about-card {
        padding: 40px 30px !important;
        margin: 0 16px !important;
    }

    /* 隐私协议和服务条款页面适配 (Privacy & Terms Page Optimization) */
    #privacy .u-card,
    #terms .u-card {
        padding: 30px 20px !important;
        margin: 0 16px !important;
    }
    #privacy h1,
    #terms h1 {
        font-size: 1.8rem;
    }
    #privacy h2,
    #terms h2 {
        font-size: 1.3rem !important;
    }

    /* 搜索框优化 (Search Box Optimization) */
    .search-box {
        width: 100%;
    }

    /* 卡片左右边距优化 (Card Margin Optimization) */
    .package-card {
        margin: 0 16px;
    }
    .faq-item {
        margin-left: 16px;
        margin-right: 16px;
    }

    /* 博客文章详情页优化 (Blog Article Page Optimization) */
    .article-container {
        padding: 12px 16px 30px !important;
        margin: 0 0 40px !important;
    }
    .breadcrumb-nav {
        margin-bottom: 12px !important;
    }
    .blog-header {
        margin-bottom: 10px !important;
        padding-bottom: 8px !important;
    }

    /* ============================================
     * 弹窗优化 (Modal Optimization)
     * ============================================ */

    /* 通用弹窗样式 (General Modal Styles) */
    .modal {
        width: 95%;
        padding: 24px 16px;
        border-radius: 20px;
        max-height: calc(100vh - 40px);
        box-sizing: border-box;
    }
    .modal-overlay {
        padding: 20px 10px;
        align-items: center;
    }

    /* 套餐详情弹窗 (Package Detail Modal) */
    .package-detail-modal {
        width: 95%;
        border-radius: 20px;
        overflow: hidden;
    }
    .pkg-detail-header {
        padding: 24px 20px 20px;
        border-radius: 20px 20px 0 0;
    }
    .pkg-detail-close {
        top: 16px;
        right: 16px;
        font-size: 2rem;
    }
    .pkg-detail-title {
        font-size: 1.5rem;
    }
    .pkg-detail-flag {
        width: 40px;
    }
    .pkg-detail-specs {
        gap: 8px;
    }
    .pkg-detail-spec-item {
        padding: 10px 8px;
    }
    .pkg-detail-spec-label {
        font-size: 0.7rem;
    }
    .pkg-detail-spec-value {
        font-size: 1.1rem;
    }
    .pkg-detail-body {
        padding: 24px 20px;
    }
    .pkg-detail-section {
        margin-bottom: 24px;
    }
    .pkg-detail-section-title {
        font-size: 1rem;
    }
    .pkg-detail-footer {
        padding: 20px 20px 24px;
    }
    .pkg-detail-buy-btn {
        padding: 16px;
        font-size: 1rem;
    }
    .pkg-detail-buy-price {
        font-size: 1.1rem;
    }

    /* 二级弹窗优化 (Sub-modal Optimization) */
    .sub-modal {
        width: 95%;
        max-width: none;
        max-height: 80vh;
        border-radius: 16px;
    }
    .sub-modal-header {
        padding: 20px 20px;
        border-radius: 16px 16px 0 0;
    }
    .sub-modal-title {
        font-size: 1.1rem;
    }
    .sub-modal-body {
        padding: 20px 20px;
    }
    .sub-modal-list-item {
        padding: 12px 14px;
        font-size: 0.9rem;
    }
    .sub-modal-close {
        width: 28px;
        height: 28px;
        font-size: 1.1rem;
    }
    .close-modal {
        top: 16px;
        right: 16px;
        font-size: 1.8rem;
    }

    /* ============================================
     * 账户模块优化 (Account Module Optimization)
     * ============================================ */

    /* 余额卡片优化 (Balance Card) */
    .balance-card {
        padding: 30px 20px;
    }
    .balance-card #userBalance,
    .balance-card #userBonusBalance {
        font-size: 2rem !important;
    }
    .balance-card .btn {
        font-size: 0.9rem;
        padding: 12px 20px;
        margin-top: 16px;
    }
    .balance-card .btn-outline {
        top: 4px !important;
        right: 6px !important;
    }

    /* 邀请返利区域优化 (Referral Section) */
    #account .u-card {
        padding: 40px 20px !important;
    }
    #account .u-card > div[style*="display: inline-flex"] {
        display: flex !important;
        flex-direction: column !important;
        gap: 12px !important;
        width: 100% !important;
        padding: 16px !important;
    }
    #account .u-card > div[style*="display: inline-flex"] span {
        font-size: 1.2rem !important;
    }
    #account .u-card > div[style*="display: inline-flex"] button {
        width: 100% !important;
        padding: 12px 24px !important;
    }

    /* 统计数字区域优化 (Statistics Section) */
    #account .u-card > div[style*="border-top"] {
        gap: 30px !important;
        padding-top: 20px !important;
    }
    #account .u-card > div[style*="border-top"] > div > div[style*="font-size: 2.5rem"] {
        font-size: 1.8rem !important;
    }
}

/* ============================================
 * 小屏幕移动端优化 (max-width: 480px)
 * Small Mobile Optimization
 * ============================================ */
/*
 * 注意：当前源文件中未找到专门针对 480px 断点的样式
 * 如需要可以在此添加更小屏幕的优化样式
 *
 * Note: No specific 480px breakpoint styles found in source
 * Add small mobile optimizations here if needed
 */

/* ============================================
 * 结束 (End of Responsive Styles)
 * ============================================ */