/* ===== CSS Variables - White & Green Theme ===== */
:root {
    --primary: #22C55E;
    --primary-dark: #16A34A;
    --primary-light: #86EFAC;
    --secondary: #166534;
    --accent: #10B981;
    --accent-light: #A7F3D0;
    --bg-light: #FFFFFF;
    --bg-dark: #064E3B;
    --bg-gradient: linear-gradient(135deg, #064E3B 0%, #065F46 100%);
    --text-dark: #1F2937;
    --text-light: #FFFFFF;
    --text-muted: #6B7280;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Section 1: Product Info - Clean White & Green ===== */
.product-info {
    background: #FFFFFF;
    padding: 0;
    min-height: auto;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.product-info .container {
    position: relative;
    z-index: 1;
    padding: 60px 20px;
}

.product-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
}

@media (min-width: 992px) {
    .product-grid {
        grid-template-columns: 1fr 1fr;
        gap: 60px;
    }
}

/* Product Gallery - Main Image + Thumbnails */
.product-gallery {
    position: relative;
}

.main-image-container {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border: 1px solid rgba(34, 197, 94, 0.15);
    box-shadow:
        0 25px 50px -12px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(34, 197, 94, 0.05);
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 450px;
    aspect-ratio: 1 / 1;
}

.main-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.main-image.fade {
    opacity: 0;
    transform: scale(0.95);
}

.gallery-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: #FFFFFF;
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    color: var(--secondary);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    z-index: 10;
}

.gallery-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 8px 25px rgba(34, 197, 94, 0.4);
}

.gallery-btn.prev {
    left: 16px;
}

.gallery-btn.next {
    right: 16px;
}

/* Thumbnail Container */
.thumbnail-container {
    display: flex;
    justify-content: flex-start;
    gap: 10px;
    margin-top: 16px;
    padding: 10px;
    overflow-x: auto;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

.thumbnail-container::-webkit-scrollbar {
    height: 6px;
}

.thumbnail-container::-webkit-scrollbar-track {
    background: rgba(34, 197, 94, 0.1);
    border-radius: 3px;
}

.thumbnail-container::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

.thumbnail {
    min-width: 70px;
    width: 70px;
    height: 70px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    background: #FFFFFF;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    padding: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
    transition: var(--transition);
}

.thumbnail:hover {
    border-color: rgba(34, 197, 94, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(34, 197, 94, 0.15);
}

.thumbnail.active {
    border-color: var(--primary);
    box-shadow: 0 4px 15px rgba(34, 197, 94, 0.3);
}

/* Premium Product Details */
.product-details {
    padding: 20px 0;
}

.product-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 20px;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.product-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    color: var(--secondary);
    margin-bottom: 20px;
    letter-spacing: -0.5px;
    line-height: 1.15;
}

.product-price-wrapper {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 32px;
}

.product-price {
    font-family: 'Montserrat', sans-serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0;
}

.product-price-old {
    font-size: 1.2rem;
    color: var(--text-muted);
    text-decoration: line-through;
}

/* CTA Buttons */
.cta-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--primary);
    color: white;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    background: transparent;
    color: var(--primary);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    border: 2px solid var(--primary);
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

/* Compact Info Cards Grid */
.info-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

@media (max-width: 480px) {
    .info-cards {
        grid-template-columns: 1fr;
    }
}

.info-card {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: #FFFFFF;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(34, 197, 94, 0.12);
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.info-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(34, 197, 94, 0.12);
}

.info-icon {
    font-size: 1.3rem;
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(34, 197, 94, 0.1);
    border-radius: 8px;
}

.info-content h3 {
    font-size: 0.85rem;
    color: var(--secondary);
    margin-bottom: 2px;
    font-weight: 600;
}

.info-content p {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ===== Section 2: Hero Banner ===== */
.hero-banner {
    width: 100%;
    overflow: hidden;
    padding: 40px 0;
    background: #FFFFFF;
}

.hero-banner .container {
    max-width: 1100px;
}

.hero-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Mobile: Full width banner */
@media (max-width: 768px) {
    .hero-banner {
        padding: 0;
    }

    .hero-banner .container {
        max-width: 100%;
        padding: 0;
    }

    .hero-image {
        border-radius: 0;
        box-shadow: none;
    }
}

/* ===== Section 3: Description ===== */
.description-section {
    background: var(--bg-gradient);
    padding: 80px 0;
    text-align: center;
}

.description-content {
    max-width: 800px;
    margin: 0 auto;
}

.description-text {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
    margin-bottom: 24px;
}

.description-text strong {
    color: var(--text-light);
}

.highlight {
    color: var(--primary);
    font-weight: 600;
}

.highlight-price {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.2em;
}

.tagline {
    font-family: 'Montserrat', sans-serif;
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-weight: 800;
    color: var(--primary-light);
    letter-spacing: 1px;
}

/* ===== Section 4: Video ===== */
.video-section {
    padding: 80px 0;
    background: var(--text-light);
}

.video-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
}

.video-thumbnail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.video-container:hover .video-thumbnail {
    transform: scale(1.05);
    opacity: 0.9;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    z-index: 5;
}

.play-button:hover {
    transform: translate(-50%, -50%) scale(1.15);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* ===== Section 5: Technical Specs ===== */
.specs-section {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--bg-light) 0%, #ECEFF1 100%);
}

.section-title {
    text-align: center;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    color: var(--secondary);
    margin-bottom: 48px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    margin: 16px auto 0;
    border-radius: 2px;
}

.specs-image-wrapper {
    max-width: 100%;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: #fff;
}

.specs-image {
    width: 100%;
    height: auto;
    display: block;
}

/* ===== Feature Sections ===== */
.feature-section {
    padding: 80px 0;
}

.feature-section:nth-child(odd) {
    background: var(--text-light);
}

.feature-section:nth-child(even) {
    background: var(--bg-light);
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
}

@media (min-width: 992px) {
    .feature-grid {
        grid-template-columns: 1fr 1fr;
    }

    .feature-left .feature-grid {
        grid-template-columns: 1fr 1fr;
    }

    .feature-right .feature-grid {
        grid-template-columns: 1fr 1fr;
    }

    .feature-right .feature-content {
        order: -1;
    }
}

.feature-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

/* Portrait images (2:3 ratio) - prevent cropping */
.feature-image.feature-portrait {
    max-width: 400px;
    margin: 0 auto;
}

.feature-image.feature-portrait img {
    width: 100%;
    height: auto;
    object-fit: contain;
}

.feature-image:hover img {
    transform: scale(1.02);
}

.feature-content {
    padding: 20px 0;
}

.feature-number {
    font-size: 3rem;
    color: var(--primary);
    opacity: 0.3;
    margin-bottom: -10px;
}

.feature-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--secondary);
    margin-bottom: 20px;
}

.feature-text {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 16px;
}

.feature-text strong {
    color: var(--secondary);
}

/* ===== Section 9: Video Playlist ===== */
.playlist-section {
    padding: 80px 0;
    background: var(--bg-gradient);
}

.playlist-section .section-title {
    color: var(--text-light);
}

.playlist-section .section-title::after {
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-light) 100%);
}

.playlist-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 768px) {
    .playlist-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.playlist-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.playlist-item:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent);
}

.playlist-item .video-container {
    border-radius: 0;
    padding-bottom: 56.25%;
}

.video-title {
    padding: 16px;
    color: var(--text-light);
    font-size: 0.95rem;
    text-align: center;
}

/* ===== Footer ===== */
.footer {
    background: var(--secondary);
    color: rgba(255, 255, 255, 0.85);
    padding: 48px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    margin-bottom: 32px;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.footer-section h4 {
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: 12px;
}

.footer-section p {
    font-size: 0.9rem;
    line-height: 1.8;
    margin-bottom: 4px;
}

.footer-section a {
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--primary);
    text-decoration: underline;
}

.hotline-main a {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.6s ease forwards;
}

/* ===== Mobile Responsive ===== */
@media (max-width: 768px) {
    .product-info .container {
        padding: 24px 16px;
    }

    .product-grid {
        gap: 24px;
    }

    .main-image-container {
        padding: 20px;
        min-height: 280px;
    }

    .main-image {
        max-height: 280px;
    }

    .gallery-btn {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }

    .gallery-btn.prev {
        left: 8px;
    }

    .gallery-btn.next {
        right: 8px;
    }

    .thumbnail-container {
        gap: 8px;
    }

    .thumbnail {
        width: 60px;
        height: 60px;
        padding: 6px;
    }

    .product-title {
        font-size: 1.4rem;
    }

    .product-price {
        font-size: 1.8rem;
    }

    .product-price-wrapper {
        margin-bottom: 20px;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 24px;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        padding: 14px 20px;
        font-size: 0.85rem;
    }

    .info-cards {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .info-card {
        padding: 12px;
    }

    .info-icon {
        width: 32px;
        height: 32px;
        font-size: 1.1rem;
    }

    .info-content h3 {
        font-size: 0.8rem;
    }

    .info-content p {
        font-size: 0.7rem;
    }

    .description-section,
    .video-section,
    .specs-section,
    .feature-section,
    .playlist-section {
        padding: 40px 0;
    }

    .section-title {
        font-size: 1.4rem;
        margin-bottom: 32px;
    }

    /* Feature Sections Mobile: Text trên, Ảnh dưới */
    .feature-grid {
        display: flex;
        flex-direction: column;
        gap: 24px;
    }

    .feature-content {
        order: 1;
        padding: 0;
    }

    .feature-image {
        order: 2;
    }

    .feature-number {
        font-size: 2rem;
        margin-bottom: -5px;
    }

    .feature-title {
        font-size: 1.2rem;
        margin-bottom: 12px;
    }

    .feature-text {
        font-size: 0.95rem;
        line-height: 1.6;
        margin-bottom: 12px;
    }

    .feature-image img {
        border-radius: var(--radius-md);
    }
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===== Floating CTA Buttons ===== */
.floating-cta {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 1000;
}

.floating-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    animation: pulse 2s infinite;
}

.floating-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.3);
}

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

.floating-btn.facebook {
    background: #1877F2;
    color: white;
}

.floating-btn .icon {
    font-size: 1.2rem;
}

.floating-btn .label {
    display: none;
}

@media (min-width: 768px) {
    .floating-btn .label {
        display: inline;
    }
}

@keyframes pulse {

    0%,
    100% {
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    }

    50% {
        box-shadow: 0 4px 30px rgba(34, 197, 94, 0.4);
    }
}