/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --primary-color: #8b5cf6;
    --primary-dark: #6d28d9;
    --secondary-color: #3b82f6;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #ffffff;
    --bg-light: #f9fafb;
    --bg-dark: #111827;
    --overlay-dark: rgba(0, 0, 0, 0.6);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;

    /* Layout */
    --container-width: 1200px;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* ===== CSS Reset ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

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

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

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* ===== Utility Classes ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.navbar.transparent {
    background: transparent;
    box-shadow: none;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-brand .logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
    background: rgba(139, 92, 246, 0.1);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-xs);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-image: url('../images/ai-generated/hero-banner.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--overlay-dark);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    color: var(--text-light);
    padding: var(--spacing-md);
}

.hero-title {
    font-size: 5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    letter-spacing: 0.05em;
}

.hero-subtitle {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

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

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: var(--font-size-lg);
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-light);
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(139, 92, 246, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    border: 2px solid var(--text-light);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--text-light);
    opacity: 0.8;
}

.scroll-indicator span {
    display: block;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

.scroll-arrow {
    width: 30px;
    height: 30px;
    border-left: 2px solid var(--text-light);
    border-bottom: 2px solid var(--text-light);
    transform: rotate(-45deg);
    margin: 0 auto;
    animation: bounce 2s infinite;
}

/* ===== Features Section ===== */
.features-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-light);
}

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

.feature-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 10px;
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-description {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== Gameplay Section ===== */
.gameplay-section {
    padding: var(--spacing-xl) 0;
    background: white;
}

.gameplay-content {
    margin-top: var(--spacing-lg);
}

.gameplay-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.gameplay-item.reverse {
    direction: rtl;
}

.gameplay-item.reverse > * {
    direction: ltr;
}

.gameplay-image {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.gameplay-image img {
    width: 100%;
    height: auto;
    transition: var(--transition);
}

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

.gameplay-text h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.gameplay-text p {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== Gallery Section ===== */
.gallery-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-light);
}

.carousel {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.carousel-container {
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.carousel-track {
    display: flex;
    transition: transform 0.5s ease;
}

.carousel-slide {
    min-width: 100%;
    flex-shrink: 0;
}

.carousel-slide img {
    width: 100%;
    height: auto;
    display: block;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    z-index: 10;
}

.carousel-btn:hover {
    background: white;
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn-prev {
    left: 20px;
}

.carousel-btn-next {
    right: 20px;
}

.carousel-indicators {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #d1d5db;
    cursor: pointer;
    transition: var(--transition);
}

.indicator.active {
    background: var(--primary-color);
    transform: scale(1.3);
}

.indicator:hover {
    background: var(--primary-dark);
}

/* ===== Download Section ===== */
.download-section {
    position: relative;
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-image: url('../images/ai-generated/download-bg.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--text-light);
}

.download-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--overlay-dark);
}

.download-section .container {
    position: relative;
    z-index: 10;
}

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

.qrcode-container {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.qrcode-item {
    text-align: center;
}

.qrcode-box {
    width: 200px;
    height: 200px;
    background: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    margin-bottom: var(--spacing-md);
}

.qrcode-box img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.qrcode-placeholder {
    background: #f3f4f6;
    display: flex;
    align-items: center;
    justify-content: center;
}

.qrcode-label {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.download-tip {
    text-align: center;
    margin-top: var(--spacing-lg);
    font-size: var(--font-size-base);
    opacity: 0.9;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

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

.footer-info h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.footer-info p {
    color: #9ca3af;
    line-height: 1.8;
}

.footer-links h4,
.footer-contact h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-links a {
    color: #9ca3af;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-contact p {
    color: #9ca3af;
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: var(--spacing-md);
    text-align: center;
}

.footer-bottom p {
    color: #6b7280;
    font-size: var(--font-size-sm);
    line-height: 1.8;
}

/* ===== Lazy Load Placeholder ===== */
.lazy-load {
    opacity: 0;
    transition: opacity 0.5s ease;
}

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