/* ==================== 平板设备 (768px 及以上) ==================== */

@media (max-width: 1024px) {
    .container {
        padding: 0 30px;
    }

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

    .hero-title {
        font-size: 2.5rem;
    }

    .value-proposition {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .value-image .placeholder {
        min-height: 300px;
    }

    .modules-container {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: 1.5rem;
    }
}

/* ==================== 小平板设备 (768px) ==================== */

@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
    }

    .nav-link {
        font-size: 0.9rem;
    }

    .hero {
        grid-template-columns: 1fr;
        padding: 3rem 0;
        min-height: auto;
        gap: 2rem;
    }

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

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-image .placeholder {
        min-height: 300px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .values-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

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

    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .reason-card {
        padding: 1.5rem;
    }

    .reason-number {
        font-size: 2.5rem;
    }

    .modules-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .module-card {
        padding: 1.5rem;
    }

    .cta h2 {
        font-size: 1.8rem;
    }

    .cta p {
        font-size: 1rem;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

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

/* ==================== 手机设备 (640px) ==================== */

@media (max-width: 640px) {
    .container {
        padding: 0 15px;
    }

    /* 导航栏调整 */
    .navbar-content {
        padding: 0.75rem 0;
    }

    .logo h1 {
        font-size: 1.4rem;
    }

    .logo .tagline {
        font-size: 0.65rem;
    }

    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .mobile-menu.active {
        display: flex;
    }

    /* 英雄区段 */
    .hero {
        padding: 2rem 0;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-description {
        font-size: 0.95rem;
    }

    .hero-image .placeholder {
        min-height: 250px;
    }

    /* 标题 */
    .section-title {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .section-title::after {
        width: 60px;
    }

    /* 卡片网格 */
    .values-grid,
    .scenarios-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .value-card,
    .scenario-card {
        padding: 1.5rem;
    }

    .value-card h3,
    .scenario-card h3 {
        font-size: 1.2rem;
    }

    .value-icon,
    .scenario-icon {
        font-size: 2.5rem;
    }

    .feature-item {
        margin-bottom: 1rem;
    }

    .feature-image {
        height: 150px;
    }

    .feature-item h3 {
        font-size: 1.1rem;
        padding: 1rem 1rem 0.5rem;
    }

    .feature-item p {
        padding: 0 1rem 1rem;
        font-size: 0.9rem;
    }

    /* 理由卡片 */
    .reason-card {
        padding: 1rem;
        margin-bottom: 1rem;
    }

    .reason-number {
        font-size: 2rem;
    }

    .reason-card h3 {
        font-size: 1.1rem;
    }

    /* CTA */
    .cta {
        padding: 3rem 0;
    }

    .cta h2 {
        font-size: 1.5rem;
    }

    .cta p {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }

    .cta-buttons {
        gap: 0.75rem;
    }

    .btn {
        padding: 10px 24px;
        font-size: 0.9rem;
    }

    .btn-large {
        padding: 12px 32px;
        font-size: 1rem;
    }

    /* 模块卡片 */
    .modules-container {
        gap: 0.75rem;
    }

    .module-card {
        padding: 1.2rem;
    }

    .module-number {
        font-size: 1.5rem;
    }

    .module-card h3 {
        font-size: 1.1rem;
    }

    .module-features li {
        font-size: 0.85rem;
        padding: 0.5rem 0;
        padding-left: 1.2rem;
    }

    /* 页脚 */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .footer-section h4 {
        font-size: 1rem;
        margin-bottom: 1rem;
    }

    .footer-section a,
    .footer-section p {
        font-size: 0.9rem;
        color: #d0d0d0;
    }

    .footer-bottom {
        gap: 0.5rem;
    }

    .footer-bottom p {
        font-size: 0.8rem;
        color: #d0d0d0;
    }

    .footer-links {
        gap: 1rem;
        font-size: 0.85rem;
    }

    .footer-links a {
        color: #d0d0d0;
    }

    /* 价值区段 */
    .value-proposition {
        gap: 1.5rem;
    }

    .value-text h3 {
        font-size: 1.3rem;
    }

    .value-text > p {
        font-size: 0.95rem;
    }

    .value-list li {
        padding: 0.75rem;
    }

    .value-image .placeholder {
        min-height: 250px;
    }

    /* 填充区段高度 */
    .core-values {
        padding: 2.5rem 0;
    }

    #features {
        padding: 2.5rem 0;
    }

    .core-features {
        padding: 2.5rem 0;
    }

    .platform-values {
        padding: 2.5rem 0;
    }

    .user-scenarios {
        padding: 2.5rem 0;
    }

    .why-choose {
        padding: 2.5rem 0;
    }
}

/* ==================== 超小手机设备 (480px 及以下) ==================== */

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    .logo h1 {
        font-size: 1.2rem;
    }

    .logo .tagline {
        font-size: 0.6rem;
    }

    .hero-title {
        font-size: 1.3rem;
        line-height: 1.2;
    }

    .hero-description {
        font-size: 0.85rem;
    }

    .section-title {
        font-size: 1.3rem;
        margin-bottom: 1.2rem;
    }

    .value-icon,
    .scenario-icon {
        font-size: 2rem;
    }

    .value-card p,
    .scenario-card p,
    .feature-item p {
        font-size: 0.85rem;
    }

    .cta h2 {
        font-size: 1.3rem;
    }

    .cta p {
        font-size: 0.85rem;
    }

    .btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    .module-card h3 {
        font-size: 1rem;
    }

    .value-text h3 {
        font-size: 1.2rem;
    }

    .feature-image {
        height: 120px;
    }

    /* 比例调整 */
    .hero {
        padding: 1.5rem 0;
    }

    .core-values,
    #features,
    .core-features,
    .platform-values,
    .user-scenarios,
    .why-choose {
        padding: 1.5rem 0;
    }

    .cta {
        padding: 2rem 0;
    }

    .footer {
        padding: 2rem 0 1rem;
    }

    .value-list li {
        padding: 0.75rem;
        color: var(--text-gray);
        font-size: 0.8rem;
        background-color: var(--light-bg);
    }
}

/* ==================== 打印样式 ==================== */

@media print {
    .navbar,
    .mobile-menu,
    .cta,
    .footer {
        display: none;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }

    .section-title {
        page-break-after: avoid;
    }

    .hero,
    .value-card,
    .feature-item,
    .module-card {
        page-break-inside: avoid;
    }
}

/* ==================== 暗色模式支持 ==================== */

@media (prefers-color-scheme: dark) {
    :root {
        --text-dark: #ecf0f1;
        --text-gray: #bdc3c7;
        --light-bg: #34495e;
        --light-gray: #2c3e50;
    }

    body {
        background-color: #2c3e50;
        color: var(--text-dark);
    }

    .navbar {
        background-color: #34495e;
        border-bottom-color: var(--light-gray);
    }

    .value-card,
    .feature-item,
    .module-card,
    .scenario-card,
    .reason-card {
        background-color: #34495e;
    }

    .hero {
        background: linear-gradient(135deg, rgba(127, 192, 208, 0.2) 0%, rgba(127, 192, 208, 0.1) 100%);
    }

    .placeholder {
        background-color: var(--light-gray);
    }

    .value-list li {
        background-color: rgba(127, 192, 208, 0.1);
    }
}

/* ==================== 触摸设备优化 ==================== */

@media (hover: none) {
    .btn:active {
        transform: translateY(-1px);
    }

    .value-card:active,
    .feature-item:active,
    .module-card:active,
    .scenario-card:active {
        transform: translateY(-4px);
    }

    .nav-link::after {
        display: none;
    }
}

/* ==================== 高清屏幕 (2倍及以上分辨率) ==================== */

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .section-title::after,
    .reason-card::before {
        will-change: transform;
    }
}

/* ==================== 低带宽模式 ==================== */

@media (prefers-reduced-data: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .placeholder svg {
        display: none;
    }

    .placeholder::after {
        content: '图片区域';
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-gray);
    }
}