/* ===== RESPONSIVE DESIGN & MEDIA QUERIES ===== */

/* ===== BREAKPOINTS ===== */
/* 
Mobile First Approach:
- xs: 0px (default)
- sm: 576px
- md: 768px  
- lg: 992px
- xl: 1200px
- xxl: 1400px
*/

/* ===== EXTRA SMALL DEVICES (Mobile Portrait) ===== */
@media (max-width: 575px) {
    :root {
        --container-padding: 1rem;
        --space-xs: 0.25rem;
        --space-sm: 0.5rem;
        --space-md: 0.5rem;   /* giảm spacing trên mobile */
        --space-lg: 0.75rem;  /* giảm spacing trên mobile */
        --space-xl: 1rem;     /* giảm spacing trên mobile */
        --space-2xl: 1.5rem;  /* giảm spacing trên mobile */
        --space-3xl: 2rem;    /* giảm spacing trên mobile */
    }

    .hero {
        padding: 6rem 0 2rem;
        min-height: auto;
    }

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

    .hero-text {
        order: 2;
    }

    .hero-image {
        order: 1;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--space-md);
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-md);
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

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

    .feature-card {
        padding: var(--space-lg);
    }

    .screenshots-gallery {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

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

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

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

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

    .section-title {
        font-size: 1.75rem;
    }

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

/* ===== SMALL DEVICES (Mobile Landscape) ===== */
@media (min-width: 576px) and (max-width: 767px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
        text-align: center;
    }

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

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

    .screenshots-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }

    .download-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }

    .docs-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }

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

/* ===== MEDIUM DEVICES (Tablets) ===== */
@media (min-width: 768px) and (max-width: 991px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-2xl);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }

    .screenshots-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }

    .download-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }

    .docs-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-xl);
    }

    .footer-content {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-xl);
    }

    /* Mobile navigation for tablets */
    .mobile-nav-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--space-lg);
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--text-muted);
    }

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

/* ===== LARGE DEVICES (Desktop) ===== */
@media (min-width: 992px) and (max-width: 1199px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }

    .screenshots-gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-xl);
    }

    .download-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-xl);
    }

    .docs-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-xl);
    }

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

/* ===== EXTRA LARGE DEVICES (Large Desktop) ===== */
@media (min-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-xl);
    }

    .screenshots-gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-2xl);
    }

    .download-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-2xl);
    }

    .docs-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-2xl);
    }

    .footer-content {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-2xl);
    }
}

/* ===== ULTRA WIDE SCREENS ===== */
@media (min-width: 1400px) {
    :root {
        --container-max-width: 1320px;
    }

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

    .screenshots-gallery {
        grid-template-columns: repeat(3, 1fr);  /* 3 ảnh trên 1 dòng cho màn hình lớn */
        gap: 3rem;
    }
}

/* ===== VERY LARGE SCREENS (1800px+) ===== */
@media (min-width: 1800px) {
    :root {
        --container-max-width: 1600px;
    }

    .screenshots-gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: 4rem;
        max-width: 1400px;
        margin: 0 auto;
    }
}

/* ===== ORIENTATION SPECIFIC ===== */
@media (orientation: landscape) and (max-height: 600px) {
    .hero {
        padding: 4rem 0 2rem;
        min-height: auto;
    }

    .hero-content {
        gap: var(--space-xl);
    }

    .section {
        padding: var(--space-2xl) 0;
    }
}

/* ===== HIGH DPI / RETINA DISPLAYS ===== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .hero-image img,
    .screenshot-item img {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .hero-image img {
        animation: none !important;
    }

    .loading,
    .loading-spinner {
        animation: none !important;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    * {
        background: white !important;
        color: black !important;
        box-shadow: none !important;
    }

    .navbar,
    .nav-controls,
    .mobile-nav-toggle,
    .theme-toggle,
    .lang-toggle,
    .lightbox,
    .footer {
        display: none !important;
    }

    .hero {
        padding: 2rem 0;
        background: white !important;
    }

    .section {
        padding: 1rem 0;
    }

    .btn {
        border: 1px solid black !important;
        background: white !important;
        color: black !important;
    }

    .feature-card,
    .download-card,
    .doc-card,
    .screenshot-item {
        border: 1px solid #ccc !important;
        box-shadow: none !important;
        page-break-inside: avoid;
    }

    .section-title,
    .hero-text h1 {
        color: black !important;
    }

    a {
        color: black !important;
        text-decoration: underline !important;
    }

    a::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #000000;
        --text-secondary: #333333;
        --text-muted: #666666;
        --bg-primary: #ffffff;
        --bg-secondary: #f8f9fa;
        --primary-color: #0066cc;
        --accent-color: #cc0066;
    }

    [data-theme="dark"] {
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
        --text-muted: #999999;
        --bg-primary: #000000;
        --bg-secondary: #1a1a1a;
        --primary-color: #66b3ff;
        --accent-color: #ff6699;
    }

    .btn,
    .feature-card,
    .download-card,
    .doc-card,
    .screenshot-item {
        border: 2px solid currentColor !important;
    }
}

/* ===== CUSTOM BREAKPOINT UTILITIES ===== */
.hide-mobile {
    display: block;
}

.show-mobile {
    display: none;
}

@media (max-width: 767px) {
    .hide-mobile {
        display: none;
    }

    .show-mobile {
        display: block;
    }
}

.hide-tablet {
    display: block;
}

.show-tablet {
    display: none;
}

@media (min-width: 768px) and (max-width: 991px) {
    .hide-tablet {
        display: none;
    }

    .show-tablet {
        display: block;
    }
}

.hide-desktop {
    display: block;
}

.show-desktop {
    display: none;
}

@media (min-width: 992px) {
    .hide-desktop {
        display: none;
    }

    .show-desktop {
        display: block;
    }
}