<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">/*
 * Tá»‡p CSS Responsive cho Website Video
 * TÃ¡c giáº£: AI Assistant
 * PhiÃªn báº£n: 1.0.0
 * MÃ´ táº£: CSS responsive há»— trá»£ toÃ&nbsp;n bá»™ thiáº¿t bá»‹ tá»« mobile Ä‘áº¿n desktop
 * Chá»©c nÄƒng: Cáº£i thiá»‡n tráº£i nghiá»‡m ngÆ°á»i dÃ¹ng trÃªn má»i kÃ­ch thÆ°á»›c mÃ&nbsp;n hÃ¬nh
 */

/* ================================
   BIáº¾N CSS VÃ€ CÃ€I Äáº¶T CÆ&nbsp; Báº¢N
   ================================ */
:root {
    /* MÃ&nbsp;u sáº¯c chá»§ Ä‘áº¡o */
    --primary-color: #0d9bff;
    --secondary-color: #ff6e2f;
    --accent-color: #00b7ff;
    --background-dark: #16161a;
    --background-card: #25252b;
    --background-secondary: #2a2a32;
    --text-primary: rgba(255, 255, 255, 0.87);
    --text-secondary: rgba(255, 255, 255, 0.6);
    --text-muted: #999;
    
    /* KÃ­ch thÆ°á»›c cÆ¡ báº£n */
    --container-max-width: 1200px;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    
    /* Khoáº£ng cÃ¡ch */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
}

/* ================================
   RESET VÃ€ CÃ€I Äáº¶T CÆ&nbsp; Báº¢N
   ================================ */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-dark);
    overflow-x: hidden;
}

/* ================================
   RESPONSIVE CONTAINER
   ================================ */
.container-responsive {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.wwp {
    max-width: 100%;
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ================================
   RESPONSIVE GRID SYSTEM
   ================================ */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -var(--spacing-sm);
}

.col {
    flex: 1;
    padding: 0 var(--spacing-sm);
}

.col-1 { flex: 0 0 8.333333%; }
.col-2 { flex: 0 0 16.666667%; }
.col-3 { flex: 0 0 25%; }
.col-4 { flex: 0 0 33.333333%; }
.col-5 { flex: 0 0 41.666667%; }
.col-6 { flex: 0 0 50%; }
.col-7 { flex: 0 0 58.333333%; }
.col-8 { flex: 0 0 66.666667%; }
.col-9 { flex: 0 0 75%; }
.col-10 { flex: 0 0 83.333333%; }
.col-11 { flex: 0 0 91.666667%; }
.col-12 { flex: 0 0 100%; }

/* ================================
   RESPONSIVE HEADER
   ================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(22, 22, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    max-width: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.logo-responsive {
    flex-shrink: 0;
    height: 40px;
}

.logo-responsive img {
    height: 100%;
    width: auto;
    object-fit: contain;
}

/* Responsive Navigation */
.nav-responsive {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: var(--spacing-sm) 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

/* Responsive Search */
.search-responsive {
    flex: 1;
    max-width: 500px;
    margin: 0 var(--spacing-lg);
    position: relative;
}

.search-input-responsive {
    width: 100%;
    height: 40px;
    border: none;
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    padding: 0 var(--spacing-lg) 0 var(--spacing-md);
    font-size: 14px;
    transition: var(--transition);
}

.search-input-responsive:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.search-button-responsive {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
}

/* ================================
   RESPONSIVE CAROUSEL
   ================================ */
.carousel-responsive {
    position: relative;
    height: 500px;
    margin-bottom: var(--spacing-xxl);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.carousel-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.carousel-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, rgba(0,0,0,0.3), rgba(0,0,0,0.7));
}

.carousel-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 600px;
    padding: var(--spacing-lg);
}

.carousel-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.carousel-description {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

/* ================================
   RESPONSIVE CARDS
   ================================ */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xxl);
}

.card-responsive {
    background: var(--background-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

.card-responsive:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.card-image {
    position: relative;
    width: 100%;
    aspect-ratio: 3/4;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.card-responsive:hover .card-image img {
    transform: scale(1.05);
}

.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent, rgba(0,0,0,0.8));
    display: flex;
    align-items: flex-end;
    padding: var(--spacing-md);
    opacity: 0;
    transition: var(--transition);
}

.card-responsive:hover .card-overlay {
    opacity: 1;
}

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

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ================================
   RESPONSIVE BUTTONS
   ================================ */
.btn-responsive {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    gap: var(--spacing-xs);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: darken(var(--primary-color), 10%);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--background-secondary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: lighten(var(--background-secondary), 10%);
}

/* ================================
   RESPONSIVE UTILITIES
   ================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-flex { display: flex; }
.d-block { display: block; }
.d-none { display: none; }

.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

/* ================================
   RESPONSIVE BREAKPOINTS
   ================================ */

/* Tablet - 768px and down */
@media (max-width: 768px) {
    :root {
        --container-max-width: 100%;
        --spacing-md: 12px;
        --spacing-lg: 16px;
        --spacing-xl: 24px;
        --spacing-xxl: 32px;
    }
    
    html { font-size: 14px; }
    
    .header-container {
        height: 60px;
        padding: 0 var(--spacing-md);
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--background-dark);
        flex-direction: column;
        padding: var(--spacing-lg);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-mobile-toggle {
        display: block;
    }
    
    .search-responsive {
        margin: 0 var(--spacing-sm);
        max-width: 200px;
    }
    
    .carousel-responsive {
        height: 300px;
    }
    
    .carousel-title {
        font-size: 1.8rem;
    }
    
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-md);
    }
}

/* Mobile - 480px and down */
@media (max-width: 480px) {
    :root {
        --spacing-md: 8px;
        --spacing-lg: 12px;
        --spacing-xl: 16px;
        --spacing-xxl: 24px;
    }
    
    html { font-size: 13px; }
    
    .header-container {
        height: 50px;
        padding: 0 var(--spacing-sm);
    }
    
    .logo-responsive {
        height: 30px;
    }
    
    .search-responsive {
        display: none;
    }
    
    .carousel-responsive {
        height: 250px;
        margin-bottom: var(--spacing-lg);
    }
    
    .carousel-title {
        font-size: 1.5rem;
    }
    
    .carousel-description {
        font-size: 0.9rem;
    }
    
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .card-content {
        padding: var(--spacing-sm);
    }
    
    .card-title {
        font-size: 0.875rem;
    }
    
    .card-subtitle {
        font-size: 0.75rem;
    }
}

/* Large Desktop - 1200px and up */
@media (min-width: 1200px) {
    :root {
        --container-max-width: 1400px;
    }
    
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    }
    
    .carousel-responsive {
        height: 600px;
    }
}

/* ================================
   PERFORMANCE OPTIMIZATIONS
   ================================ */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s;
}

.lazy-load.loaded {
    opacity: 1;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
        --background-dark: #000000;
        --background-card: #1a1a1a;
    }
}

/* ================================
   DARK/LIGHT MODE SUPPORT
   ================================ */
[data-theme="light"] {
    --background-dark: #ffffff;
    --background-card: #f8f9fa;
    --background-secondary: #e9ecef;
    --text-primary: rgba(0, 0, 0, 0.87);
    --text-secondary: rgba(0, 0, 0, 0.6);
    --text-muted: #6c757d;
}

/* ================================
   PRINT STYLES
   ================================ */
@media print {
    .header,
    .nav-responsive,
    .search-responsive,
    .btn-responsive {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .card-responsive {
        break-inside: avoid;
        margin-bottom: var(--spacing-md);
    }
} </pre></body></html>