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

:root {
    /* Colors - matching AppTheme.swift */
    --primary: #1C1C1E;
    --secondary: #8E8E93;
    --success: #34C759;
    --error: #FF3B30;
    --accent: #007AFF;
    
    --text-primary: #000000;
    --text-secondary: rgba(60, 60, 67, 0.6);
    --text-tertiary: rgba(60, 60, 67, 0.3);
    
    --background: #F2F2F7;
    --card-background: #FFFFFF;
    --border: #C6C6C8;
    --divider: #E5E5EA;
    
    --shadow-light: rgba(0, 0, 0, 0.04);
    --shadow-medium: rgba(0, 0, 0, 0.08);
    --shadow-dark: rgba(0, 0, 0, 0.12);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-s: 8px;
    --spacing-m: 16px;
    --spacing-l: 20px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-xxxl: 64px;
    
    /* Border Radius */
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 20px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', 'Roboto', sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Language Switcher */
.language-switcher {
    position: fixed;
    top: var(--spacing-l);
    right: var(--spacing-l);
    z-index: 1000;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-s);
    background: var(--card-background);
    border: 1px solid var(--border);
    border-radius: var(--radius-medium);
    padding: var(--spacing-s) var(--spacing-m);
    font-size: 15px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
    box-shadow: 0 2px 12px var(--shadow-medium);
    min-width: 160px;
}

.lang-toggle:hover {
    background: var(--background);
    box-shadow: 0 4px 16px var(--shadow-dark);
}

.lang-icon {
    font-size: 18px;
}

.lang-current {
    flex: 1;
    text-align: left;
}

.lang-arrow {
    font-size: 10px;
    transition: transform 0.2s ease;
}

.lang-toggle.active .lang-arrow {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + var(--spacing-s));
    right: 0;
    background: var(--card-background);
    border-radius: var(--radius-medium);
    padding: var(--spacing-s);
    box-shadow: 0 4px 20px var(--shadow-medium);
    display: none;
    flex-direction: column;
    gap: var(--spacing-xs);
    max-height: 60vh;
    overflow-y: auto;
    min-width: 200px;
}

.lang-dropdown.show {
    display: flex;
}

.lang-btn {
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-small);
    padding: var(--spacing-s) var(--spacing-m);
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
    text-align: left;
    white-space: nowrap;
}

.lang-btn:hover {
    background: var(--background);
    color: var(--text-primary);
    border-color: var(--border);
}

.lang-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xxxl) 0;
    background: linear-gradient(135deg, #F2F2F7 0%, #E5E5EA 100%);
}

.hero-icon {
    font-size: 120px;
    margin-bottom: var(--spacing-l);
    animation: float 3s ease-in-out infinite;
}

.hero-logo {
    width: 180px;
    height: 180px;
    margin-bottom: var(--spacing-l);
    border-radius: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero-title {
    font-size: 64px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-m);
    letter-spacing: -2px;
}

.hero-subtitle {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-l);
}

.hero-description {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-m);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-m) var(--spacing-xl);
    border-radius: var(--radius-small);
    font-size: 17px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px var(--shadow-medium);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-dark);
}

.btn-secondary {
    background: var(--card-background);
    color: var(--primary);
    border: 1px solid var(--border);
}

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

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

.badge {
    background: var(--card-background);
    padding: var(--spacing-s) var(--spacing-m);
    border-radius: var(--radius-large);
    font-size: 14px;
    color: var(--text-primary);
    box-shadow: 0 2px 8px var(--shadow-light);
}

/* Features Section */
.features {
    padding: var(--spacing-xxxl) 0;
    background: var(--card-background);
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    text-align: center;
    color: var(--primary);
    margin-bottom: var(--spacing-xxl);
    letter-spacing: -1px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--background);
    padding: var(--spacing-xl);
    border-radius: var(--radius-medium);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-medium);
}

.feature-icon {
    font-size: 56px;
    margin-bottom: var(--spacing-m);
}

.feature-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--spacing-s);
}

.feature-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* What is HEIC Section */
.what-is-heic {
    padding: var(--spacing-xxxl) 0;
    background: linear-gradient(135deg, #F8F9FA 0%, #E9ECEF 100%);
}

.heic-content {
    max-width: 900px;
    margin: 0 auto;
}

.heic-intro {
    font-size: 20px;
    line-height: 1.8;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    padding: 0 var(--spacing-l);
}

.heic-comparison {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xxl);
}

.comparison-item {
    background: var(--card-background);
    padding: var(--spacing-xl);
    border-radius: var(--radius-large);
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.comparison-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-medium);
}

.comparison-item.highlight {
    border-color: var(--success);
    background: linear-gradient(135deg, #FFFFFF 0%, #F0FFF4 100%);
}

.comparison-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-m);
}

.comparison-item h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--spacing-m);
}

.comparison-item p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.heic-benefits {
    background: var(--card-background);
    padding: var(--spacing-xl);
    border-radius: var(--radius-large);
    box-shadow: 0 4px 16px var(--shadow-light);
}

.heic-benefits h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--spacing-l);
    text-align: center;
}

.benefits-list {
    list-style: none;
    display: grid;
    gap: var(--spacing-m);
}

.benefits-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-m);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
}

.benefit-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--success);
    color: white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}

/* Formats Section */
.formats {
    padding: var(--spacing-xxxl) 0;
    background: var(--background);
}

.formats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-l);
    max-width: 900px;
    margin: 0 auto;
}

.format-item {
    background: var(--card-background);
    padding: var(--spacing-xl);
    border-radius: var(--radius-medium);
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.format-item:hover {
    border-color: var(--accent);
    transform: scale(1.05);
}

.format-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.format-desc {
    font-size: 14px;
    color: var(--text-secondary);
    overflow-wrap: break-word;
    word-break: break-word;
    hyphens: auto;
}

/* Download Section */
.download {
    padding: var(--spacing-xxxl) 0;
    background: linear-gradient(135deg, var(--primary) 0%, #2C2C2E 100%);
    color: white;
    text-align: center;
}

.download .section-title {
    color: white;
}

.download-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xxl);
}

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

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-m);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-l) var(--spacing-xl);
    border-radius: var(--radius-medium);
    text-decoration: none;
    color: white;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.download-icon {
    font-size: 48px;
}

.download-info {
    text-align: left;
}

.download-label {
    font-size: 12px;
    opacity: 0.8;
}

.download-platform {
    font-size: 24px;
    font-weight: 700;
}

.download-note {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.7);
}

/* Footer */
.footer {
    padding: var(--spacing-xxl) 0;
    background: var(--card-background);
    text-align: center;
    border-top: 1px solid var(--divider);
}

.footer-text {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-m);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero-logo {
        width: 120px;
        height: 120px;
        border-radius: 28px;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .heic-comparison {
        grid-template-columns: 1fr;
        gap: var(--spacing-l);
    }
    
    .heic-intro {
        font-size: 18px;
    }
    
    .formats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .language-switcher {
        top: var(--spacing-m);
        right: var(--spacing-m);
    }
    
    .lang-toggle {
        min-width: 140px;
        font-size: 14px;
    }
    
    .lang-dropdown {
        max-height: 50vh;
    }
}

@media (max-width: 480px) {
    .hero-logo {
        width: 100px;
        height: 100px;
        border-radius: 24px;
    }
    
    .hero-icon {
        font-size: 80px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .formats-grid {
        grid-template-columns: 1fr;
    }
    
    .language-switcher {
        top: var(--spacing-s);
        right: var(--spacing-s);
    }
    
    .lang-toggle {
        min-width: 120px;
        font-size: 13px;
        padding: 6px 10px;
    }
    
    .lang-dropdown {
        max-height: 40vh;
        min-width: 160px;
    }
    
    .lang-btn {
        font-size: 13px;
        padding: 6px 10px;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background: var(--accent);
    color: white;
}