/* ===================================
   Responsive Styles
   Mobile First Approach
   =================================== */

/* ===================================
   Tablet (768px and below)
   =================================== */
@media (max-width: 768px) {
    /* Typography Adjustments */
    :root {
        --font-size-5xl: 42px;
        --font-size-4xl: 36px;
        --font-size-3xl: 28px;
        --font-size-2xl: 22px;
        --spacing-4xl: 64px;
        --spacing-3xl: 48px;
    }

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

    /* Navigation */
    .nav {
        height: 70px;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(10, 17, 40, 0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(0, 217, 255, 0.2);
        padding: var(--spacing-lg) 0;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-item {
        width: 100%;
        text-align: center;
        padding: var(--spacing-md) 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-item:last-child {
        border-bottom: none;
    }

    .nav-link {
        display: block;
        padding: var(--spacing-md);
    }

    .nav-cta {
        display: inline-block;
        margin-top: var(--spacing-md);
    }

    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-toggle.active .hamburger {
        background: transparent;
    }

    .nav-toggle.active .hamburger::before {
        transform: rotate(45deg);
        top: 0;
    }

    .nav-toggle.active .hamburger::after {
        transform: rotate(-45deg);
        top: 0;
    }

    /* Hero Section */
    .hero {
        min-height: auto;
        padding: calc(70px + var(--spacing-3xl)) 0 var(--spacing-2xl);
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .hero-content {
        order: 2;
        text-align: center;
        max-width: 100%;
    }

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

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

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .hero-stats {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
        width: 100%;
        overflow: hidden;
    }

    .stat {
        min-width: 0;
        text-align: center;
    }

    .stat-icon svg,
    .icon-head-small svg {
        max-width: 52px;
        height: auto;
    }

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

    .hero-visual {
        order: 1;
    }

    .visual-card {
        max-width: 350px;
    }

    /* Sections */
    .section-title {
        font-size: var(--font-size-3xl);
    }

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

    /* Reconnect Section */
    .reconnect {
        padding: var(--spacing-3xl) 0;
    }

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

    .reconnect-image {
        height: 200px;
    }

    /* Advantages Section */
    .advantages {
        padding: var(--spacing-3xl) 0;
    }

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

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

    .advantage-icon {
        width: 56px;
        height: 56px;
    }

    .advantage-scroll-svg {
        width: 37px;
        height: 44px;
    }

    .advantage-title {
        font-size: var(--font-size-lg);
    }

    /* News Section */
    .news {
        padding: var(--spacing-3xl) 0;
    }

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

    /* Contact Section */
    .contact {
        padding: var(--spacing-3xl) 0;
    }

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

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

    /* Download Section */
    .download {
        padding: var(--spacing-3xl) 0;
    }

    .download-card {
        grid-template-columns: 1fr;
        padding: var(--spacing-2xl);
        gap: var(--spacing-2xl);
    }

    .download-title {
        font-size: var(--font-size-3xl);
        text-align: center;
    }

    .download-subtitle {
        text-align: center;
        font-size: var(--font-size-base);
    }

    .download-visual {
        display: none;
    }

    /* Donation Section */
    .donation {
        padding: var(--spacing-2xl) 0;
    }

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

    .donation-title {
        font-size: var(--font-size-2xl);
        text-align: center;
    }

    .donation-subtitle {
        text-align: center;
        font-size: var(--font-size-sm);
    }

    .donation-amount-btns,
    .donation-payment-btns {
        gap: var(--spacing-xs);
    }

    .donation-visual {
        display: none;
    }

    /* Footer */
    .footer {
        padding: var(--spacing-2xl) 0 var(--spacing-lg);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }

    .footer-logo {
        width: 100%;
        align-items: center;
        display: flex;
        flex-direction: column;
        text-align: center;
    }

    .footer-description {
        text-align: center;
        align-items: center;
        display: flex;
        flex-direction: column;
    }

    .footer-heading {
        text-align: center;
    }

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

    .footer-links-2col {
        grid-template-columns: 1fr;
    }

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

    .footer-contact li {
        justify-content: center;
    }

    .footer-made-in-france {
        justify-content: center;
    }

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

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

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

    .back-to-top {
        bottom: 20px;
        right: 20px;
    }

    /* Modal */
    .modal-content {
        padding: var(--spacing-lg);
    }

    .modal-title {
        font-size: var(--font-size-xl);
        padding-right: var(--spacing-2xl);
    }

    .modal-amount-selector {
        flex-wrap: wrap;
    }

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

/* ===================================
   Large Tablet (900px and below)
   =================================== */
@media (max-width: 900px) and (min-width: 769px) {
    .reconnect-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .hero-content {
        max-width: 100%;
        text-align: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-visual {
        max-width: 400px;
        margin: 0 auto;
    }

    .download-card {
        grid-template-columns: 1fr;
    }

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

/* ===================================
   Mobile (480px and below)
   =================================== */
@media (max-width: 480px) {
    :root {
        --font-size-5xl: 32px;
        --font-size-4xl: 28px;
        --font-size-3xl: 24px;
        --font-size-2xl: 20px;
        --spacing-3xl: 32px;
        --spacing-2xl: 24px;
    }

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

    .nav-logo {
        gap: var(--spacing-sm);
    }

    .logo {
        width: 100px;
        height: 100px;
    }

    .lang-switcher {
        margin-left: var(--spacing-sm);
    }

    .lang-btn {
        font-size: 13px;
    }

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

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .visual-card {
        max-width: 280px;
    }

    .section-header {
        margin-bottom: var(--spacing-2xl);
    }

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

    .advantage-card {
        padding: var(--spacing-md);
    }

    .advantage-icon {
        width: 48px;
        height: 48px;
    }

    .advantage-scroll-svg {
        width: 32px;
        height: 38px;
    }

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

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

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

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

    .download-info {
        gap: var(--spacing-sm);
    }

    .info-item {
        font-size: var(--font-size-sm);
    }

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

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

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

    /* Coming soon label — réduit sur petite carte */
    .coming-soon-label {
        font-size: 11px;
        letter-spacing: 0.04em;
        bottom: var(--spacing-sm);
    }

    /* Donation buttons — taille réduite sur mobile */
    .donation-amount-btn,
    .donation-pay-btn {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-md);
    }

    /* Coming soon modal body — padding réduit */
    .cs-modal-body {
        padding: var(--spacing-md) var(--spacing-sm) var(--spacing-lg);
    }
}

/* ===================================
   Large Screens (1440px and above)
   =================================== */
@media (min-width: 1440px) {
    .container {
        max-width: 1320px;
    }

    .hero-title {
        font-size: 72px;
    }

    .section-title {
        font-size: 56px;
    }

    .reconnect-grid,
    .advantages-grid,
    .news-grid {
        gap: var(--spacing-2xl);
    }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .header,
    .nav-toggle,
    .hero-visual,
    .download-visual,
    .floating-element,
    .gradient-orb,
    .modal,
    .footer {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .hero,
    .advantages,
    .news,
    .download {
        page-break-inside: avoid;
    }

    a {
        text-decoration: underline;
    }

    .btn {
        border: 1px solid black;
    }
}

/* ===================================
   Landscape Mobile Orientation
   =================================== */
@media (max-height: 600px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: calc(70px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    }

    .hero-stats {
        flex-direction: row;
        justify-content: center;
        padding-top: var(--spacing-md);
    }

    .visual-card {
        max-width: 300px;
    }
}

/* ===================================
   Touch Device Optimizations
   =================================== */
@media (hover: none) and (pointer: coarse) {
    /* Larger tap targets for touch devices */
    .btn {
        min-height: 48px;
        padding: var(--spacing-md) var(--spacing-xl);
    }

    .nav-link {
        padding: var(--spacing-lg);
    }

    .nav-toggle {
        min-width: 48px;
        min-height: 48px;
    }

    /* Remove hover effects on touch devices */
    .advantage-card:hover,
    .news-card:hover {
        transform: none;
    }

    /* Simplify animations */
    .gradient-orb {
        animation: none;
    }

    .visual-card {
        animation: none;
    }
}

/* ===================================
   High DPI Screens
   =================================== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    /* Ensure images and graphics are crisp on retina displays */
    body {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
}

/* ===================================
   Dark Mode Support (Optional)
   =================================== */
@media (prefers-color-scheme: dark) {
    /* Already optimized for dark mode as default */
    /* This section can be used if you want to add a light mode toggle */
}

/* ===================================
   Reduced Data Mode
   =================================== */
@media (prefers-reduced-data: reduce) {
    /* Reduce or remove background effects */
    .gradient-orb {
        display: none;
    }

    .floating-element {
        display: none;
    }

    /* Simplify backgrounds */
    .hero-background {
        background: var(--color-dark-blue);
    }

    .advantages {
        background: var(--color-dark-blue-lighter);
    }
}