/* Beijing Xiannuoda Commerce And Trade Co., Ltd. - Responsive Styles */

/* Tablet and Below */
@media (max-width: 1024px) {
    :root {
        --font-size-4xl: 48px;
        --font-size-3xl: 36px;
        --font-size-2xl: 28px;
        --spacing-3xl: 64px;
        --spacing-2xl: 48px;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-stats {
        gap: var(--spacing-xl);
    }

    .hero-stat-number {
        font-size: var(--font-size-2xl);
    }

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

    .app-showcase {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .app-preview {
        order: -1;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

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

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

    .timeline::before {
        left: 30px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        padding-left: 80px;
        padding-right: 0;
        justify-content: flex-start;
    }

    .timeline-dot {
        left: 30px;
    }

    .timeline-content::before,
    .timeline-item:nth-child(even) .timeline-content::before {
        left: -10px;
        right: auto;
    }
}

/* Mobile Devices */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 36px;
        --font-size-3xl: 28px;
        --font-size-2xl: 24px;
        --font-size-xl: 20px;
        --spacing-3xl: 48px;
        --spacing-2xl: 32px;
        --spacing-xl: 24px;
        --max-width: 100%;
    }

    body {
        font-size: 14px;
    }

    /* Navigation */
    .navbar-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--bg-white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        gap: var(--spacing-sm);
    }

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

    .navbar-toggle {
        display: flex;
    }

    .navbar-link {
        padding: var(--spacing-sm);
        width: 100%;
        text-align: center;
        border-radius: var(--border-radius-md);
        transition: var(--transition-fast);
    }

    .navbar-link:hover {
        background: var(--bg-light);
    }

    /* Hero Section */
    .hero {
        min-height: auto;
        padding: 100px 0 var(--spacing-2xl);
    }

    .hero-content {
        padding: var(--spacing-md);
    }

    .hero-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--spacing-md);
    }

    .hero-subtitle {
        font-size: var(--font-size-lg);
        margin-bottom: var(--spacing-lg);
    }

    .hero-description {
        font-size: var(--font-size-base);
    }

    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .hero-stat {
        padding: var(--spacing-sm);
        background: var(--bg-white);
        border-radius: var(--border-radius-lg);
        box-shadow: var(--shadow-sm);
    }

    .hero-stat-number {
        font-size: var(--font-size-2xl);
    }

    .hero-bg-animation {
        display: none;
    }

    /* Sections */
    .section {
        padding: var(--spacing-2xl) 0;
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .section-subtitle {
        font-size: var(--font-size-base);
    }

    /* Services Grid */
    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .service-card {
        padding: var(--spacing-lg);
    }

    .service-icon {
        width: 60px;
        height: 60px;
    }

    .service-icon svg {
        width: 30px;
        height: 30px;
    }

    /* Features Grid */
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .feature-item {
        padding: var(--spacing-sm);
    }

    .feature-icon {
        width: 50px;
        height: 50px;
    }

    .feature-icon svg {
        width: 24px;
        height: 24px;
    }

    /* App Showcase */
    .app-showcase {
        gap: var(--spacing-lg);
    }

    .app-mockup {
        width: 250px;
        height: 500px;
        border-radius: 30px;
        border-width: 6px;
    }

    .app-info {
        padding: var(--spacing-md);
    }

    .app-info h3 {
        font-size: var(--font-size-xl);
    }

    .app-features {
        gap: var(--spacing-sm);
    }

    .app-feature {
        padding: var(--spacing-xs);
        font-size: var(--font-size-sm);
    }

    /* About Section */
    .about-grid {
        gap: var(--spacing-lg);
    }

    .about-image-placeholder {
        height: 250px;
        font-size: var(--font-size-xl);
    }

    .about-content h3 {
        font-size: var(--font-size-xl);
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .about-stat {
        padding: var(--spacing-sm);
    }

    .about-stat-number {
        font-size: var(--font-size-xl);
    }

    /* News Grid */
    .news-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .news-image {
        height: 180px;
        font-size: var(--font-size-2xl);
    }

    .news-content {
        padding: var(--spacing-md);
    }

    /* Contact Section */
    .contact-grid {
        gap: var(--spacing-lg);
    }

    .contact-info,
    .contact-form {
        padding: var(--spacing-lg);
    }

    .contact-item {
        padding: var(--spacing-sm) 0;
    }

    .contact-icon {
        width: 40px;
        height: 40px;
    }

    .contact-icon svg {
        width: 20px;
        height: 20px;
    }

    /* Footer */
    .footer {
        padding: var(--spacing-xl) 0 var(--spacing-lg);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }

    .footer-legal {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    /* Page Header */
    .page-header {
        padding: 100px 0 var(--spacing-xl);
    }

    .page-header h1 {
        font-size: var(--font-size-2xl);
    }

    .page-header p {
        font-size: var(--font-size-base);
    }

    /* Culture Section */
    .culture-values {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .culture-card {
        padding: var(--spacing-lg);
    }

    .culture-icon {
        width: 80px;
        height: 80px;
    }

    .culture-icon svg {
        width: 40px;
        height: 40px;
    }

    /* Timeline */
    .timeline {
        padding: var(--spacing-sm);
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        padding-left: 60px;
    }

    .timeline-dot {
        left: 20px;
        width: 16px;
        height: 16px;
    }

    .timeline-content {
        padding: var(--spacing-md);
    }

    .timeline-title {
        font-size: var(--font-size-base);
    }

    .timeline-description {
        font-size: var(--font-size-sm);
    }

    /* Legal Content */
    .legal-content {
        padding: var(--spacing-lg);
        margin: var(--spacing-md);
    }

    .legal-content h2 {
        font-size: var(--font-size-xl);
    }

    .legal-content h3 {
        font-size: var(--font-size-lg);
    }

    .legal-content p {
        font-size: var(--font-size-sm);
    }
}

/* Small Mobile Devices */
@media (max-width: 480px) {
    :root {
        --font-size-4xl: 28px;
        --font-size-3xl: 24px;
        --font-size-2xl: 20px;
        --spacing-3xl: 32px;
        --spacing-2xl: 24px;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .navbar-brand span {
        font-size: var(--font-size-lg);
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: var(--font-size-sm);
    }

    .btn-lg {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-base);
    }

    .app-mockup {
        width: 200px;
        height: 400px;
        border-radius: 24px;
        border-width: 5px;
    }

    .footer-section h4 {
        font-size: var(--font-size-base);
    }

    .footer-section p,
    .footer-link {
        font-size: var(--font-size-sm);
    }

    .social-link {
        width: 35px;
        height: 35px;
    }

    .social-link svg {
        width: 18px;
        height: 18px;
    }
}

/* Large Desktop Screens */
@media (min-width: 1440px) {
    :root {
        --max-width: 1400px;
        --font-size-4xl: 72px;
        --font-size-3xl: 56px;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-2xl);
    }

    .services-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .news-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Ultra Wide Screens */
@media (min-width: 1920px) {
    :root {
        --max-width: 1600px;
        --font-size-4xl: 80px;
        --font-size-3xl: 64px;
        --font-size-2xl: 40px;
    }

    .hero {
        min-height: 90vh;
    }

    .hero-content {
        max-width: 1200px;
    }

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

/* Print Styles */
@media print {
    .navbar,
    .hero-bg-animation,
    .hero-buttons,
    .footer,
    .mobile-menu-toggle {
        display: none !important;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-lg);
    }

    .section {
        padding: var(--spacing-lg) 0;
        break-inside: avoid;
    }

    a {
        text-decoration: underline;
    }

    .legal-content {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}

/* Accessibility - Reduced Motion */
@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;
    }

    .hero-bg-animation {
        display: none;
    }

    .app-mockup {
        animation: none;
    }

    .reveal,
    .reveal-left,
    .reveal-right,
    .reveal-up,
    .reveal-scale {
        opacity: 1;
        transform: none;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #004499;
        --secondary-color: #002244;
        --text-dark: #000000;
        --text-light: #333333;
        --border-color: #000000;
    }

    .service-card,
    .news-card,
    .culture-card {
        border: 2px solid var(--text-dark);
    }

    .btn {
        border: 2px solid currentColor;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        /* Can be customized for dark mode if needed */
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .navbar-link:hover::after {
        width: 0;
    }

    .service-card:hover {
        transform: none;
    }

    .news-card:hover {
        transform: none;
    }

    .feature-item:hover {
        transform: none;
    }

    .app-feature:hover {
        background: var(--bg-light);
        color: var(--text-dark);
    }

    .app-feature:hover svg {
        fill: var(--primary-color);
    }

    /* Active states for touch devices */
    .btn:active {
        transform: scale(0.98);
    }

    .service-card:active,
    .news-card:active {
        transform: scale(0.99);
    }
}

/* Landscape Mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: 80px 0 var(--spacing-lg);
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .hero-stats {
        flex-direction: row;
        gap: var(--spacing-lg);
    }

    .hero-stat {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* Smart TV / Large Touch Screens */
@media (min-width: 1920px) and (hover: none) and (pointer: coarse) {
    .navbar-link {
        font-size: var(--font-size-lg);
        padding: var(--spacing-md);
    }

    .btn {
        padding: var(--spacing-md) var(--spacing-xl);
        font-size: var(--font-size-lg);
    }

    .service-card {
        padding: var(--spacing-2xl);
    }

    .service-icon {
        width: 100px;
        height: 100px;
    }
}

/* Orientation Change */
@media (orientation: portrait) {
    .app-showcase {
        grid-template-columns: 1fr;
    }

    .app-preview {
        order: -1;
    }
}

@media (orientation: landscape) {
    .app-showcase {
        grid-template-columns: 1fr 1fr;
    }
}