/* Đặt lại kiểu */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Tối ưu hóa hiệu suất */
html {
    scroll-behavior: smooth;
}

/* Tải trước tài nguyên chính */
.preload {
    content: '';
    position: absolute;
    left: -9999px;
    background-image: url('./logo.png');
}

/* Tối ưu hóa hình ảnh */
img {
    max-width: 100%;
    height: auto;
    display: block;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Giảm thiểu việc vẽ lại và sắp xếp lại */
.will-change {
    will-change: transform, opacity;
}

/* Tăng tốc GPU */
.gpu-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Biến gốc */
:root {
    --primary-color: #ff6b35;
    --secondary-color: #1a1a2e;
    --accent-color: #16213e;
    --text-primary: #ffffff;
    --text-secondary: #b8b8b8;
    --gradient-primary: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
    --gradient-secondary: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --gradient-dark: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 100%);
    --shadow-primary: 0 10px 30px rgba(255, 107, 53, 0.3);
    --shadow-secondary: 0 5px 15px rgba(0, 0, 0, 0.3);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Kiểu cơ bản */
body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--gradient-dark);
    overflow-x: hidden;
    font-display: swap;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Thanh điều hướng */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid rgba(255, 107, 53, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.brand-name {
    font-family: 'Orbitron', monospace;
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
}

/* Biểu ngữ trang chủ */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-dark);
    z-index: -2;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23ff6b35" stroke-width="0.5" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(10px, 10px); }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, transparent 0%, rgba(26, 26, 46, 0.8) 100%);
    z-index: -1;
}

.hero-content {
    text-align: center;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    margin-bottom: 20px;
}

.title-main {
    display: block;
    font-family: 'Orbitron', monospace;
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    animation: titleGlow 2s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    from { filter: drop-shadow(0 0 20px rgba(255, 107, 53, 0.5)); }
    to { filter: drop-shadow(0 0 30px rgba(255, 107, 53, 0.8)); }
}

.title-sub {
    display: block;
    font-size: clamp(1.2rem, 3vw, 2rem);
    font-weight: 300;
    color: var(--text-secondary);
    letter-spacing: 2px;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
}

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

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator {
    width: 2px;
    height: 30px;
    background: var(--gradient-primary);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.5); }
}

/* Kiểu khối chung */
section {
    padding: 100px 0;
}

.section-title {
    font-family: 'Orbitron', monospace;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Khu vực hiển thị trò chơi */
.games-section {
    background: var(--gradient-secondary);
}

.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.game-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(255, 107, 53, 0.1);
}

.game-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-primary);
    border-color: var(--primary-color);
}

.game-image {
    position: relative;
    overflow: hidden;
    height: 200px;
}

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

.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.game-card:hover .game-image img {
    transform: scale(1.1);
}

.play-btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.play-btn:hover {
    transform: scale(1.05);
}

.game-info {
    padding: 20px;
}

.game-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.game-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Khu vực tính năng đặc biệt */
.features-section {
    background: var(--gradient-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 40px 20px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: 1px solid rgba(255, 107, 53, 0.1);
}

.feature-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    color: var(--primary-color);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Khu vực tin tức */
.news-section {
    background: var(--gradient-secondary);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.news-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(255, 107, 53, 0.1);
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-secondary);
    border-color: var(--primary-color);
}

.news-image {
    height: 200px;
    overflow: hidden;
}

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

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

.news-content {
    padding: 25px;
}

.news-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
    font-size: 0.85rem;
}

.news-date {
    color: var(--text-secondary);
}

.news-category {
    color: var(--primary-color);
    font-weight: 500;
}

.news-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.news-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 15px;
}

.news-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.news-link:hover {
    color: #ff8c5a;
}

/* Khu vực liên hệ */
.contact-section {
    background: var(--gradient-dark);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.contact-info p {
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.6;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-secondary);
}

.contact-icon {
    font-size: 1.2rem;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form input,
.form textarea {
    padding: 15px;
    border: 1px solid rgba(255, 107, 53, 0.2);
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form input:focus,
.form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.form input::placeholder,
.form textarea::placeholder {
    color: var(--text-secondary);
}

/* Chân trang */
.footer {
    background: var(--accent-color);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.footer-logo span {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 12px;
    border: 1px solid rgba(255, 107, 53, 0.2);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.social-link:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background: rgba(255, 107, 53, 0.1);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 107, 53, 0.1);
    color: var(--text-secondary);
}

/* Thiết kế đáp ứng */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: rgba(26, 26, 46, 0.98);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        padding: 20px 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 200px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .games-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .news-grid {
        grid-template-columns: 1fr;
    }

    section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .nav-container {
        padding: 0 15px;
    }

    .hero-content {
        padding: 0 15px;
    }

    .game-info,
    .news-content {
        padding: 20px 15px;
    }

    .feature-card {
        padding: 30px 15px;
    }
}

/* Kiểu thanh cuộn */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-color);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #ff8c5a 0%, #ffb347 100%);
}

/* Hiệu ứng tải */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Kiểu chọn văn bản */
::selection {
    background: rgba(255, 107, 53, 0.3);
    color: var(--text-primary);
}

::-moz-selection {
    background: rgba(255, 107, 53, 0.3);
    color: var(--text-primary);
}

/* Logo Link Styles */
.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.logo-link:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

/* Reviews Section */
.reviews-section {
    padding: 100px 0;
    background: var(--gradient-secondary);
    position: relative;
}

.reviews-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.02"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    pointer-events: none;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin: 50px 0;
}

.review-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    padding: 30px;
    border: 1px solid rgba(255, 107, 53, 0.1);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-primary);
    border-color: rgba(255, 107, 53, 0.3);
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
}

.reviewer-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.reviewer-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.reviewer-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 5px;
}

.review-rating .stars {
    font-size: 16px;
    color: #ffd700;
}

.review-date {
    color: var(--text-secondary);
    font-size: 14px;
}

.review-content p {
    font-style: italic;
    line-height: 1.7;
    color: var(--text-secondary);
}

.reviews-summary {
    text-align: center;
    margin-top: 50px;
    padding: 40px;
    background: rgba(255, 107, 53, 0.1);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 107, 53, 0.2);
}

.rating-score {
    font-size: 48px;
    font-weight: 900;
    color: var(--primary-color);
    display: block;
    margin-bottom: 10px;
}

.rating-stars {
    font-size: 24px;
    margin-bottom: 15px;
}

.rating-text {
    color: var(--text-secondary);
    font-size: 16px;
}

/* FAQ Section */
.faq-section {
    padding: 100px 0;
    background: var(--gradient-dark);
    position: relative;
}

.faq-container {
    max-width: 800px;
    margin: 50px auto 0;
}

.faq-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border: 1px solid rgba(255, 107, 53, 0.1);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(255, 107, 53, 0.3);
}

.faq-question {
    padding: 25px 30px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(255, 107, 53, 0.1);
}

.faq-question h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.faq-toggle {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    transition: var(--transition);
    min-width: 30px;
    text-align: center;
}

.faq-answer {
    padding: 0 30px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 30px 25px;
    max-height: 200px;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* Responsive Design for New Sections */
@media (max-width: 768px) {
    .reviews-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .review-card {
        padding: 20px;
    }
    
    .reviewer-info {
        gap: 10px;
    }
    
    .reviewer-avatar {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .rating-score {
        font-size: 36px;
    }
    
    .faq-question {
        padding: 20px;
    }
    
    .faq-question h3 {
        font-size: 16px;
    }
    
    .faq-item.active .faq-answer {
        padding: 0 20px 20px;
    }
}