/* CSS Reset and Variables */
:root {
    --primary-color: #a59b8f;
    --secondary-color: #934f3d;
    --accent-color: #dd763a;
    --dark-color: #3b2627;
    --text-light: #ffffff;
    --text-dark: #333333;
    --text-gray: #666666;
    --bg-light: #fafafa;
    --bg-dark: #2a1f20;
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent-color) 0%, var(--secondary-color) 100%);
    --gradient-dark: linear-gradient(135deg, var(--dark-color) 0%, var(--secondary-color) 100%);
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.25);
    --border-radius: 8px;
    --border-radius-large: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-primary: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Playfair Display', serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-color);
}

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

/* Utility Classes */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.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 0.5s;
}

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

.btn-primary {
    background: var(--gradient-accent);
    color: var(--text-light);
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
    color: var(--text-light);
}

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

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

.btn-download {
    background: var(--gradient-primary);
    color: var(--text-light);
    font-size: 1.125rem;
    padding: 1rem 2.5rem;
    box-shadow: var(--shadow-medium);
}

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

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    color: var(--dark-color);
    margin-bottom: 1rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.section-subtitle {
    color: var(--text-gray);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(165, 155, 143, 0.2);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-light);
}

.navbar {
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-logo a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--dark-color);
    font-weight: 700;
    font-size: 1.25rem;
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 4px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-dark);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--accent-color);
    background: rgba(221, 118, 58, 0.1);
}

.nav-link i {
    font-size: 0.875rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 3px;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--dark-color);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: var(--gradient-dark);
    color: var(--text-light);
    padding: 8rem 0 6rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at top right, rgba(221, 118, 58, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at bottom left, rgba(165, 155, 143, 0.1) 0%, transparent 50%);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(221, 118, 58, 0.2);
    color: var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(221, 118, 58, 0.3);
}

.hero-title {
    margin-bottom: 1.5rem;
}

.title-main {
    display: block;
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-light) 0%, var(--primary-color) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.title-sub {
    display: block;
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary-color);
    font-family: var(--font-primary);
}

.hero-description {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
    min-width: 24px;
}

.feature-text h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
    color: var(--text-light);
}

.feature-text span {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.hero-info {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
}

.info-item i {
    color: var(--accent-color);
}

.hero-image {
    position: relative;
}

.game-preview {
    position: relative;
    border-radius: var(--border-radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-heavy);
}

.game-preview img {
    width: 100%;
    height: auto;
    display: block;
}

.preview-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    cursor: pointer;
}

.preview-overlay i {
    font-size: 4rem;
    color: var(--text-light);
}

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

/* Features Section */
.features {
    padding: 6rem 0;
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--text-light);
    padding: 2rem;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon i {
    font-size: 2rem;
    color: var(--text-light);
}

.feature-card h3 {
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.7;
}

/* Gallery Section */
.gallery {
    padding: 6rem 0;
    background: var(--text-light);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.gallery-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 16/10;
}

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

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

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

.gallery-item:hover img {
    transform: scale(1.05);
}

/* Gallery Modal */
.gallery-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 10000;
    padding: 2rem;
}

.modal-content {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-image {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: var(--border-radius);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
    color: var(--text-light);
    cursor: pointer;
    z-index: 10001;
}

.modal-prev,
.modal-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    color: var(--text-light);
    border: none;
    padding: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.modal-prev {
    left: 2rem;
}

.modal-next {
    right: 2rem;
}

.modal-prev:hover,
.modal-next:hover {
    background: rgba(0, 0, 0, 0.8);
}

.modal-counter {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-light);
    font-size: 1rem;
}

/* News Section */
.news {
    padding: 6rem 0;
    background: var(--bg-light);
}

.news-grid {
    display: grid;
    gap: 2rem;
}

.news-card {
    background: var(--text-light);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
}

.news-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.news-card.featured {
    background: var(--gradient-dark);
    color: var(--text-light);
}

.news-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--accent-color);
    color: var(--text-light);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.news-card h3 {
    margin-bottom: 1rem;
    color: inherit;
}

.news-excerpt {
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.news-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    opacity: 0.8;
}

.news-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.news-link {
    color: var(--accent-color);
    font-weight: 500;
}

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

/* Reviews Section */
.reviews {
    padding: 6rem 0;
    background: var(--text-light);
}

.reviews-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
    text-align: center;
}

.stat-item {
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: var(--border-radius);
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent-color);
    font-family: var(--font-display);
}

.stat-label {
    color: var(--text-gray);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.stat-stars {
    color: var(--accent-color);
}

.reviews-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 3rem;
}

.tag {
    background: var(--primary-color);
    color: var(--text-light);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
}

.reviews-carousel {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    overflow: hidden;
}

.review-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: var(--border-radius-large);
    text-align: center;
    display: none;
}

.review-card.active {
    display: block;
}

.review-stars {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.review-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-gray);
    margin-bottom: 1.5rem;
    font-style: italic;
}

.review-author {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.author-name {
    font-weight: 600;
    color: var(--dark-color);
}

.author-platform {
    font-size: 0.875rem;
    color: var(--text-gray);
}

.carousel-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.carousel-btn {
    background: var(--primary-color);
    color: var(--text-light);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.carousel-btn:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}

.carousel-dots {
    display: flex;
    gap: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(165, 155, 143, 0.3);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--primary-color);
}

/* Changelog Section */
.changelog {
    padding: 6rem 0;
    background: var(--bg-light);
}

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

.changelog-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 5rem;
}

.timeline-badge {
    position: absolute;
    left: 0;
    top: 0;
    width: 60px;
    height: 60px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-medium);
}

.timeline-badge i {
    font-size: 1.5rem;
    color: var(--text-light);
}

.timeline-content {
    background: var(--text-light);
    padding: 2rem;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-light);
}

.version-header {
    margin-bottom: 1.5rem;
}

.version-header h3 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.version-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-gray);
}

.version-meta span {
    background: var(--bg-light);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
}

.version-features h4 {
    color: var(--secondary-color);
    margin: 1.5rem 0 1rem;
    font-size: 1.125rem;
}

.version-features ul {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.version-features li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.version-platforms {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.platform-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-light);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    color: var(--text-light);
}

/* Download Section */
.download {
    padding: 6rem 0;
    background: var(--gradient-dark);
    color: var(--text-light);
}

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

.download .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.download-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-large);
    padding: 3rem;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 3rem;
    align-items: center;
    margin-bottom: 3rem;
}

.game-title h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.game-subtitle {
    font-size: 1.125rem;
    color: var(--primary-color);
    font-weight: 300;
}

.download-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
}

.detail-item i {
    color: var(--accent-color);
    min-width: 20px;
}

.download-action {
    text-align: center;
}

.download-note {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.system-requirements {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-large);
    padding: 2rem;
}

.system-requirements h4 {
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

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

.req-item {
    font-size: 0.9rem;
    line-height: 1.6;
}

.req-item strong {
    color: var(--accent-color);
}

/* FAQ Section */
.faq {
    padding: 6rem 0;
    background: var(--text-light);
}

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

.faq-item {
    background: var(--bg-light);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(165, 155, 143, 0.1);
}

.faq-question h4 {
    margin: 0;
    color: var(--dark-color);
    font-size: 1.125rem;
}

.faq-question i {
    color: var(--accent-color);
    transition: var(--transition);
}

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

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease-out;
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding: 0 1.5rem 1.5rem;
}

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

/* Footer */
.footer {
    background: var(--dark-color);
    color: var(--text-light);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

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

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.footer-info p {
    margin: 0;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--accent-color);
    color: var(--text-light);
    transform: translateY(-2px);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-accent);
    color: var(--text-light);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .nav-container {
        padding: 0 1.5rem;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
    
    .download-card {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
    
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--text-light);
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-medium);
        gap: 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-item {
        width: 100%;
        text-align: center;
        margin-bottom: 1rem;
    }
    
    .nav-link {
        justify-content: center;
        padding: 1rem;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero {
        padding: 6rem 0 4rem;
    }
    
    .title-main {
        font-size: 2.5rem;
    }
    
    .hero-features {
        grid-template-columns: 1fr;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-info {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .reviews-stats {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .modal-prev,
    .modal-next {
        padding: 0.75rem;
        font-size: 1.25rem;
    }
    
    .modal-prev {
        left: 1rem;
    }
    
    .modal-next {
        right: 1rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .hero-features {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }
    
    .feature-item {
        flex-direction: column;
        text-align: center;
        padding: 0.75rem;
    }
    
    .feature-text h4 {
        font-size: 0.875rem;
    }
    
    .feature-text span {
        font-size: 0.75rem;
    }
    
    .download-details {
        grid-template-columns: 1fr;
    }
    
    .requirements-grid {
        grid-template-columns: 1fr;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }
}

/* Loading and Lazy Loading - 已移除懒加载效果 */

/* Smooth Scrolling Enhancement */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Print Styles */
@media print {
    .header,
    .back-to-top,
    .carousel-controls,
    .modal-prev,
    .modal-next {
        display: none !important;
    }
    
    .hero {
        background: none !important;
        color: var(--text-dark) !important;
    }
    
    .hero-title {
        color: var(--text-dark) !important;
    }
}