/* ===== 平板设备 (768px - 1024px) ===== */
@media (max-width: 1024px) {
    .container {
        padding: 0 15px;
    }
    
    .nav-menu.desktop-menu {
        gap: 15px;
    }
    
    .hero {
        grid-template-columns: 1fr;
        padding: 60px 0;
    }
    
    .hero-content h1 {
        font-size: 36px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .cta-buttons .btn {
        width: 100%;
        justify-content: center;
    }
}

/* ===== 手机设备 (480px - 768px) ===== */
@media (max-width: 768px) {
    .navbar {
        height: 60px;
    }
    
    .nav-container {
        height: 60px;
        padding: 0 15px;
    }
    
    .logo {
        height: 35px;
    }
    
    .logo-text {
        font-size: 20px;
    }
    
    /* 隐藏桌面菜单，显示汉堡菜单 */
    .nav-menu.desktop-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    main {
        margin-top: 60px;
    }
    
    .page-header {
        padding: 60px 0;
        margin-top: 60px;
    }
    
    .page-header h1 {
        font-size: 28px;
    }
    
    .page-header p {
        font-size: 16px;
    }
    
    /* Hero 区 */
    .hero {
        padding: 40px 0;
    }
    
    .hero-content h1 {
        font-size: 28px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    /* 特性区 */
    .features {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 24px;
        margin-bottom: 40px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feature-card {
        padding: 30px;
    }
    
    /* 统计区 */
    .stats {
        padding: 60px 0;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    .stat-number {
        font-size: 32px;
    }
    
    .stat-label {
        font-size: 14px;
    }
    
    /* 快速开始 */
    .quick-start {
        padding: 60px 0;
    }
    
    .steps-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .step-card {
        padding: 30px;
    }
    
    /* CTA 区 */
    .cta-section {
        padding: 60px 0;
    }
    
    .cta-content h2 {
        font-size: 24px;
    }
    
    .cta-content p {
        font-size: 16px;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .cta-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    /* 下载页面 */
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .download-card {
        padding: 30px;
    }
    
    .channels-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tab-buttons {
        flex-direction: column;
        gap: 10px;
    }
    
    .tab-btn {
        padding: 12px 15px;
        border-bottom: none;
        border: 2px solid var(--border-color);
        border-radius: 8px;
        margin-bottom: 0;
    }
    
    .tab-btn.active {
        border-color: var(--primary-color);
        background: rgba(30, 136, 229, 0.1);
    }
    
    .requirements-grid {
        grid-template-columns: 1fr;
    }
    
    /* FAQ */
    .category-tabs {
        gap: 10px;
    }
    
    .category-btn {
        padding: 8px 15px;
        font-size: 14px;
    }
    
    .faq-header h3 {
        font-size: 16px;
    }
    
    .category-badge {
        padding: 4px 10px;
        font-size: 11px;
        margin-left: 10px;
    }
    
    .faq-body {
        padding: 20px;
    }
    
    .faq-cta h2 {
        font-size: 24px;
    }
    
    .faq-cta p {
        font-size: 16px;
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .scroll-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
}

/* ===== 小屏手机 (< 480px) ===== */
@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }
    
    .nav-container {
        padding: 0 12px;
    }
    
    .page-header h1 {
        font-size: 24px;
    }
    
    .hero-content h1 {
        font-size: 24px;
    }
    
    .hero-content p {
        font-size: 14px;
    }
    
    .section-title {
        font-size: 20px;
        margin-bottom: 30px;
    }
    
    .feature-card {
        padding: 20px;
    }
    
    .feature-icon {
        font-size: 36px;
    }
    
    .feature-card h3 {
        font-size: 18px;
    }
    
    .feature-card p {
        font-size: 14px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .stat-number {
        font-size: 28px;
    }
    
    .step-card {
        padding: 20px;
    }
    
    .step-number {
        width: 50px;
        height: 50px;
        font-size: 24px;
    }
    
    .step-card h3 {
        font-size: 18px;
    }
    
    .cta-content h2 {
        font-size: 20px;
    }
    
    .cta-content p {
        font-size: 14px;
    }
    
    .btn {
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .btn-large {
        padding: 12px 20px;
        font-size: 16px;
    }
    
    .download-card {
        padding: 20px;
    }
    
    .platform-icon {
        font-size: 48px;
    }
    
    .download-card h2 {
        font-size: 22px;
    }
    
    .qr-code img {
        width: 120px;
        height: 120px;
    }
    
    .channels-grid {
        grid-template-columns: 1fr;
    }
    
    .channel-item {
        padding: 20px;
    }
    
    .guide-steps li {
        padding-left: 40px;
    }
    
    .guide-steps li::before {
        width: 35px;
        height: 35px;
        font-size: 16px;
    }
    
    .guide-steps h3 {
        font-size: 16px;
    }
    
    .requirement-card {
        padding: 20px;
    }
    
    .requirement-card h3 {
        font-size: 18px;
    }
    
    .faq-header {
        padding: 15px;
    }
    
    .faq-header h3 {
        font-size: 14px;
    }
    
    .faq-body {
        padding: 15px;
        font-size: 14px;
    }
    
    .faq-body h4 {
        font-size: 15px;
    }
    
    .faq-tip,
    .faq-warning {
        padding: 12px 15px;
        gap: 10px;
    }
    
    .faq-tip i,
    .faq-warning i {
        font-size: 18px;
    }
    
    .footer-content {
        gap: 20px;
    }
    
    .footer-section h4 {
        font-size: 14px;
    }
    
    .footer-section a {
        font-size: 14px;
    }
    
    .disclaimer {
        font-size: 11px;
    }
}

/* ===== 超小屏设备 (< 360px) ===== */
@media (max-width: 360px) {
    .logo-text {
        font-size: 18px;
    }
    
    .page-header h1 {
        font-size: 20px;
    }
    
    .hero-content h1 {
        font-size: 20px;
    }
    
    .section-title {
        font-size: 18px;
    }
    
    .stat-number {
        font-size: 24px;
    }
    
    .btn {
        padding: 8px 12px;
        font-size: 13px;
    }
}

/* ===== 横屏模式 ===== */
@media (max-height: 600px) and (orientation: landscape) {
    .hero {
        padding: 40px 0;
    }
    
    .hero-content h1 {
        font-size: 28px;
    }
    
    .features {
        padding: 40px 0;
    }
    
    .quick-start {
        padding: 40px 0;
    }
}

/* ===== 打印样式 ===== */
@media print {
    .navbar,
    .mobile-menu,
    .scroll-to-top,
    .cta-section,
    .faq-cta {
        display: none;
    }
    
    body {
        background: white;
    }
    
    main {
        margin-top: 0;
    }
    
    .page-header {
        margin-top: 0;
    }
}

/* ===== 高分辨率屏幕 ===== */
@media (min-width: 1440px) {
    .container {
        max-width: 1320px;
    }
    
    .hero-content h1 {
        font-size: 56px;
    }
    
    .section-title {
        font-size: 40px;
    }
    
    .feature-card {
        padding: 50px;
    }
}