/* CSS Variables for Theme Colors */
:root {
    --primary-color: #7b8573;
    --secondary-color: #312824;
    --accent-color: #774b47;
    --light-color: #eddacc;
    --white: #ffffff;
    --black: #000000;
    --gray-light: #f8f9fa;
    --gray-medium: #6c757d;
    --gray-dark: #343a40;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    --gradient-secondary: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    --gradient-light: linear-gradient(135deg, var(--light-color), var(--white));
    
    /* Shadows */
    --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 16px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-small: 4px;
    --radius-medium: 8px;
    --radius-large: 12px;
    --radius-round: 50%;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Noto Sans SC', 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--secondary-color);
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    color: var(--secondary-color);
    position: relative;
}

.section-title i {
    margin-right: var(--spacing-sm);
    color: var(--accent-color);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: var(--radius-small);
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-light);
    z-index: 1000;
    transition: all var(--transition-normal);
}

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

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--secondary-color);
    font-size: 1.25rem;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.nav-logo:hover {
    color: var(--accent-color);
}

.logo-img {
    width: 32px;
    height: 32px;
    margin-right: var(--spacing-sm);
    border-radius: var(--radius-small);
}

.nav-menu {
    display: flex;
}

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

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-medium);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--accent-color);
    background: var(--light-color);
}

.nav-link i {
    font-size: 0.9rem;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--secondary-color);
    margin: 3px 0;
    transition: all var(--transition-fast);
    border-radius: var(--radius-small);
}

/* Hero Section */
.hero {
    background: var(--gradient-light);
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<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="20" cy="20" r="1" fill="%23774b47" opacity="0.1"/><circle cx="80" cy="40" r="1" fill="%237b8573" opacity="0.1"/><circle cx="40" cy="80" r="1" fill="%23312824" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--accent-color);
    margin-bottom: var(--spacing-lg);
    font-family: 'Roboto', sans-serif;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--gray-dark);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.7;
}

.hero-info {
    margin-bottom: var(--spacing-xl);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.info-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-light);
    transition: transform var(--transition-fast);
}

.info-item:hover {
    transform: translateY(-2px);
}

.info-item i {
    color: var(--accent-color);
    font-size: 1.1rem;
}

.platform-tags {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.platform-tag {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-large);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-light);
}

.feature-tags {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.feature-tag {
    background: var(--light-color);
    color: var(--secondary-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-large);
    font-size: 0.9rem;
    font-weight: 500;
    border: 2px solid var(--primary-color);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--gradient-primary);
    color: var(--white);
    text-decoration: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-large);
    font-size: 1.125rem;
    font-weight: 600;
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

.download-btn:hover::before {
    left: 100%;
}

/* News Section */
.news {
    padding: 80px 0;
    background: var(--gray-light);
}

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

.news-item {
    background: var(--white);
    border-radius: var(--radius-large);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-light);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.news-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.news-date {
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.news-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
}

.news-content {
    color: var(--gray-dark);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* Gallery Section */
.gallery {
    padding: 80px 0;
    background: var(--white);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.gallery-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-heavy);
}

.gallery-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay i {
    color: var(--white);
    font-size: 2rem;
}

/* Reviews Section */
.reviews {
    padding: 80px 0;
    background: var(--gradient-light);
}

.reviews-stats {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.rating-overview {
    margin-bottom: var(--spacing-xl);
}

.rating-score {
    font-size: 4rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.rating-stars {
    font-size: 1.5rem;
    color: #ffc107;
    margin-bottom: var(--spacing-sm);
}

.rating-count {
    color: var(--gray-medium);
    font-size: 1.1rem;
}

.rating-tags {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.rating-tag {
    background: var(--white);
    color: var(--secondary-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-large);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-light);
}

.reviews-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.review-item {
    background: var(--white);
    border-radius: var(--radius-large);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-medium);
    transition: transform var(--transition-normal);
}

.review-item:hover {
    transform: translateY(-3px);
}

.review-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.reviewer-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-round);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.2rem;
}

.reviewer-name {
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-xs);
}

.review-stars {
    color: #ffc107;
    font-size: 0.9rem;
}

.review-text {
    color: var(--gray-dark);
    line-height: 1.6;
    font-style: italic;
}

/* Version History Section */
.versions {
    padding: 80px 0;
    background: var(--white);
}

.version-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.version-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-primary);
    border-radius: var(--radius-small);
}

.version-item {
    position: relative;
    margin-bottom: var(--spacing-xxl);
    padding-left: 80px;
}

.version-marker {
    position: absolute;
    left: 18px;
    top: 20px;
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: var(--radius-round);
    border: 4px solid var(--white);
    box-shadow: var(--shadow-medium);
}

.version-content {
    background: var(--white);
    border-radius: var(--radius-large);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-medium);
    border-left: 4px solid var(--accent-color);
}

.version-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.version-number {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--secondary-color);
}

.version-date {
    color: var(--accent-color);
    font-weight: 500;
}

.version-size {
    background: var(--light-color);
    color: var(--secondary-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-small);
    font-size: 0.9rem;
    font-weight: 500;
}

.version-platforms {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.platform-badge {
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-small);
    font-size: 0.8rem;
    font-weight: 500;
}

.version-changes {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.version-changes li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--gray-dark);
    line-height: 1.5;
}

.version-changes li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.version-download {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--gradient-primary);
    color: var(--white);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-medium);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.version-download:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* FAQ Section */
.faq {
    padding: 80px 0;
    background: var(--gray-light);
}

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

.faq-item {
    background: var(--white);
    border-radius: var(--radius-large);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: box-shadow var(--transition-normal);
}

.faq-item:hover {
    box-shadow: var(--shadow-medium);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    cursor: pointer;
    background: var(--white);
    transition: background var(--transition-fast);
}

.faq-question:hover {
    background: var(--gray-light);
}

.faq-question h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin: 0;
}

.faq-question i {
    color: var(--accent-color);
    font-size: 1.2rem;
    transition: transform var(--transition-normal);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
    background: var(--gray-light);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p,
.faq-answer ol,
.faq-answer ul {
    padding: var(--spacing-lg) var(--spacing-xl);
    margin: 0;
    color: var(--gray-dark);
    line-height: 1.6;
}

.faq-answer ol {
    padding-left: calc(var(--spacing-xl) + var(--spacing-lg));
}

.faq-answer li {
    margin-bottom: var(--spacing-sm);
}

/* Footer */
.footer {
    background: var(--gradient-secondary);
    color: var(--light-color);
    padding: 60px 0 20px;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-md);
}

.footer-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--light-color);
}

.footer-logo {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-small);
}

.footer-description {
    color: rgba(237, 218, 204, 0.8);
    line-height: 1.6;
}

.footer-subtitle {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--light-color);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: rgba(237, 218, 204, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--light-color);
}

.footer-links i {
    font-size: 0.9rem;
    width: 16px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(237, 218, 204, 0.2);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    color: rgba(237, 218, 204, 0.8);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.footer-legal a {
    color: rgba(237, 218, 204, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-legal a:hover {
    color: var(--light-color);
}

.footer-legal span {
    color: rgba(237, 218, 204, 0.5);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-round);
    cursor: pointer;
    font-size: 1.2rem;
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-normal);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-medium);
        padding: var(--spacing-lg) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .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);
    }
    
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .platform-tags,
    .feature-tags {
        justify-content: center;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .reviews-slider {
        grid-template-columns: 1fr;
    }
    
    .version-timeline::before {
        left: 15px;
    }
    
    .version-item {
        padding-left: 50px;
    }
    
    .version-marker {
        left: 3px;
    }
    
    .version-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .platform-tags,
    .feature-tags {
        flex-direction: column;
        align-items: center;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section-title {
        font-size: 1.75rem;
    }
}

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.animate-fade-in-left {
    animation: fadeInLeft 0.6s ease-out;
}

.animate-fade-in-right {
    animation: fadeInRight 0.6s ease-out;
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Focus states for accessibility */
.nav-link:focus,
.download-btn:focus,
.version-download:focus,
.back-to-top:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .header,
    .back-to-top {
        display: none;
    }
    
    .hero {
        padding-top: 0;
    }
    
    * {
        color: black !important;
        background: white !important;
    }
}