/* Enhanced Mobile-First CSS for Calsyco Download Page */
/* Modern Reset & Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Modern Color System - Google Play Store Inspired */
    --primary-color: #1976D2;
    --primary-dark: #1565C0;
    --primary-light: #42A5F5;
    --secondary-color: #2E7D32;
    --accent-color: #FF6F00;
    
    /* Light Theme Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --bg-tertiary: #F1F3F4;
    --surface-color: #FFFFFF;
    --surface-elevated: #FFFFFF;
    
    /* Text Colors */
    --text-primary: #202124;
    --text-secondary: #5F6368;
    --text-tertiary: #80868B;
    --text-inverse: #FFFFFF;
    --text-disabled: #DADCE0;
    
    /* Border & Divider Colors */
    --border-primary: #DADCE0;
    --border-secondary: #E8EAED;
    --border-light: #F1F3F4;
    --divider-color: #E8EAED;
    
    /* Status Colors */
    --success-color: #137333;
    --warning-color: #F9AB00;
    --error-color: #D93025;
    --info-color: #1976D2;
    
    /* Shadow System - Material Design 3 */
    --shadow-xs: 0 1px 2px 0 rgba(60, 64, 67, 0.1);
    --shadow-sm: 0 1px 3px 0 rgba(60, 64, 67, 0.15), 0 1px 2px 0 rgba(60, 64, 67, 0.06);
    --shadow-md: 0 2px 6px 2px rgba(60, 64, 67, 0.15), 0 1px 2px 0 rgba(60, 64, 67, 0.3);
    --shadow-lg: 0 4px 8px 3px rgba(60, 64, 67, 0.15), 0 1px 3px 0 rgba(60, 64, 67, 0.3);
    --shadow-xl: 0 6px 10px 4px rgba(60, 64, 67, 0.15), 0 2px 3px 0 rgba(60, 64, 67, 0.3);
    --shadow-2xl: 0 8px 12px 6px rgba(60, 64, 67, 0.15), 0 4px 4px 0 rgba(60, 64, 67, 0.3);
    
    /* Border Radius System */
    --radius-xs: 4px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 28px;
    --radius-full: 9999px;
    
    /* Spacing System (Mobile-First) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;
    
    /* Typography System */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    --font-size-4xl: 40px;
    --font-size-5xl: 48px;
    
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-black: 900;
    
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Transitions */
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index Scale */
    --z-base: 0;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bg-primary: #121212;
    --bg-secondary: #1E1E1E;
    --bg-tertiary: #2F2F2F;
    --surface-color: #121212;
    --surface-elevated: #1E1E1E;
    
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --text-tertiary: #808080;
    --text-inverse: #121212;
    --text-disabled: #404040;
    
    --border-primary: #404040;
    --border-secondary: #2F2F2F;
    --border-light: #2F2F2F;
    --divider-color: #2F2F2F;
}
}

/* Base HTML & Body */
html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow-x: hidden;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Focus Management */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

/* Container System */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-8);
    }
}

/* Header - Mobile First */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-secondary);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: blur(16px) saturate(180%);
    background: rgba(255, 255, 255, 0.8);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
}

.nav-container {
    padding: var(--space-3) 0;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    transition: var(--transition-fast);
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

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

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    background: var(--bg-tertiary);
}

.logo-text {
    font-weight: var(--font-weight-black);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: none;
    gap: var(--space-2);
}

.nav-link {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

/* Theme Toggle Button */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    margin-left: var(--space-3);
}

.theme-toggle:hover {
    background: var(--bg-primary);
    color: var(--primary-color);
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.theme-toggle i {
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
}

[data-theme="dark"] .theme-toggle i.fa-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle::before {
    content: '\f185';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: var(--font-size-base);
}

.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    gap: 4px;
}

.mobile-menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: var(--transition-fast);
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: none;
    }
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 80px);
}

/* Hero Section - Mobile Optimized */
.hero-section {
    padding: var(--space-8) 0;
    background: var(--bg-primary);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    align-items: center;
}

@media (min-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr 400px;
        gap: var(--space-12);
    }
}

/* App Info Section */
.app-info {
    text-align: center;
}

@media (min-width: 1024px) {
    .app-info {
        text-align: left;
    }
}

.app-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
    .app-header {
        flex-direction: row;
        text-align: left;
    }
}

.app-icon-container {
    position: relative;
}

.app-icon {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

@media (min-width: 768px) {
    .app-icon {
        width: 120px;
        height: 120px;
    }
}

.app-icon-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: var(--bg-tertiary);
    transition: var(--transition-normal);
}

.app-icon-img:hover {
    transform: scale(1.05);
}

/* Error handling for broken images */
.app-icon-img::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.verified-badge {
    position: absolute;
    bottom: -6px;
    right: -6px;
    width: 28px;
    height: 28px;
    background: var(--secondary-color);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-md);
    border: 3px solid var(--bg-primary);
}

.app-details {
    flex: 1;
    min-width: 0;
}

.app-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-black);
    margin-bottom: var(--space-2);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: var(--line-height-tight);
}

@media (min-width: 768px) {
    .app-title {
        font-size: var(--font-size-4xl);
    }
}

.app-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-normal);
}

@media (min-width: 768px) {
    .app-subtitle {
        font-size: var(--font-size-xl);
    }
}

/* Limited Time Badge */
.limited-time-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    background: linear-gradient(135deg, #FF6F00 0%, #FF8F00 100%);
    color: var(--text-inverse);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow-md);
    animation: pulse 2s ease-in-out infinite;
}

.limited-time-badge i {
    animation: tick 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: var(--shadow-md);
    }
    50% {
        transform: scale(1.05);
        box-shadow: var(--shadow-lg);
    }
}

@keyframes tick {
    0%, 100% {
        transform: rotate(0deg);
    }
    25% {
        transform: rotate(-10deg);
    }
    75% {
        transform: rotate(10deg);
    }
}

.app-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    align-items: center;
}

@media (min-width: 768px) {
    .app-meta {
        flex-direction: row;
        flex-wrap: wrap;
        align-items: flex-start;
        gap: var(--space-6);
    }
}

.rating,
.download-count,
.content-rating {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
}

.stars {
    display: flex;
    gap: 2px;
}

.stars i {
    color: #FBBC04;
    font-size: var(--font-size-sm);
}

.rating-text {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.rating-count {
    color: var(--text-secondary);
}

.download-count i {
    color: var(--primary-color);
}

.age-rating {
    background: var(--bg-tertiary);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-xs);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-xs);
}

/* Download Section */
.download-section {
    margin-top: var(--space-8);
}

.download-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    position: relative;
    overflow: hidden;
    min-height: 56px;
    -webkit-tap-highlight-color: transparent;
}

@media (min-width: 640px) {
    .download-btn {
        width: auto;
        min-width: 280px;
    }
}

.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 0.6s;
}

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

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

.download-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.download-btn i {
    font-size: var(--font-size-xl);
}

.download-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
}

.download-label {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
}

.download-size {
    font-size: var(--font-size-xs);
    opacity: 0.9;
}

.download-note {
    margin-top: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.download-note i {
    color: var(--secondary-color);
}

/* Limited Time Notice */
.limited-time-notice {
    margin-top: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--accent-color);
    background: linear-gradient(135deg, rgba(255, 111, 0, 0.1) 0%, rgba(255, 143, 0, 0.1) 100%);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 111, 0, 0.2);
    text-align: center;
}

.limited-time-notice i {
    color: var(--accent-color);
    animation: bounce 2s ease-in-out infinite;
}

.limited-time-notice strong {
    color: var(--accent-color);
    font-weight: var(--font-weight-bold);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-3px);
    }
    60% {
        transform: translateY(-2px);
    }
}

/* Screenshots Preview */
.screenshots-preview {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    position: relative;
    width: 250px;
    height: 500px;
}

@media (min-width: 768px) {
    .phone-mockup {
        width: 300px;
        height: 600px;
    }
}

.phone-frame {
    width: 100%;
    height: 100%;
    background: var(--text-primary);
    border-radius: var(--radius-2xl);
    padding: var(--space-6) var(--space-4);
    box-shadow: var(--shadow-2xl);
    position: relative;
}

.phone-frame::before {
    content: '';
    position: absolute;
    top: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 6px;
    background: var(--text-tertiary);
    border-radius: var(--radius-full);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.screenshot-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
    background: var(--bg-tertiary);
}

/* Screenshots Section */
.screenshots-section {
    padding: var(--space-12) 0;
    background: var(--bg-secondary);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-black);
    text-align: center;
    margin-bottom: var(--space-8);
    color: var(--text-primary);
}

@media (min-width: 768px) {
    .section-title {
        font-size: var(--font-size-4xl);
    }
}

.screenshots-carousel {
    position: relative;
}

.carousel-container {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: var(--z-dropdown);
    width: 48px;
    height: 48px;
    background: var(--bg-primary);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
}

.carousel-btn:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn.prev {
    left: var(--space-4);
}

.carousel-btn.next {
    right: var(--space-4);
}

.screenshots-grid {
    display: flex;
    gap: var(--space-4);
    overflow-x: auto;
    scroll-behavior: smooth;
    padding: var(--space-6);
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.screenshots-grid::-webkit-scrollbar {
    display: none;
}

.screenshot-item {
    position: relative;
    min-width: 180px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--bg-primary);
    transition: var(--transition-normal);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

@media (min-width: 768px) {
    .screenshot-item {
        min-width: 220px;
    }
}

.screenshot-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.screenshot-item.active {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--primary-color);
}

.screenshot-item img {
    width: 100%;
    height: 320px;
    object-fit: cover;
    display: block;
    background: var(--bg-tertiary);
    transition: var(--transition-normal);
}

@media (min-width: 768px) {
    .screenshot-item img {
        height: 400px;
    }
}

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

.screenshot-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: var(--text-inverse);
    padding: var(--space-6) var(--space-4) var(--space-4);
    text-align: center;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    opacity: 0;
    transition: var(--transition-normal);
}

.screenshot-item:hover .screenshot-label {
    opacity: 1;
}

/* Features Section */
.features-section {
    padding: var(--space-12) 0;
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 640px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.feature-card {
    background: var(--bg-secondary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid var(--border-light);
    cursor: pointer;
}

.feature-card:hover {
    background: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
    color: var(--text-inverse);
    font-size: var(--font-size-2xl);
}

.feature-card h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

/* App Info Section */
.app-info-section {
    padding: var(--space-12) 0;
    background: var(--bg-secondary);
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
}

@media (min-width: 1024px) {
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.info-card {
    background: var(--bg-primary);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.info-card h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-6);
    color: var(--text-primary);
}

.version-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.version {
    font-weight: var(--font-weight-semibold);
    color: var(--primary-color);
}

.date {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.update-list {
    list-style: none;
    padding: 0;
}

.update-list li {
    position: relative;
    padding-left: var(--space-6);
    margin-bottom: var(--space-3);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

.update-list li::before {
    content: '•';
    position: absolute;
    left: var(--space-2);
    color: var(--primary-color);
    font-weight: var(--font-weight-bold);
}

.app-details-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--border-light);
}

.detail-item:last-child {
    border-bottom: none;
}

.label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

.value {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: var(--text-inverse);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer-content {
        grid-template-columns: repeat(4, 1fr);
    }
}

.footer-section h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
    color: var(--text-inverse);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.footer-logo img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    object-fit: cover;
}

.footer-logo span {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-black);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-6);
    line-height: var(--line-height-relaxed);
}

.social-links {
    display: flex;
    gap: var(--space-4);
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    text-decoration: none;
    transition: var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: var(--space-3);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
}

.footer-section ul li a:hover {
    color: var(--text-inverse);
    text-decoration: underline;
}

.footer-download-btn {
    background: var(--primary-color);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: fit-content;
}

.footer-download-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-sm);
}

/* Download Modal */
.download-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.download-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    max-width: 400px;
    width: calc(100% - var(--space-8));
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9) translateY(20px);
    transition: var(--transition-normal);
    box-shadow: var(--shadow-2xl);
}

.download-modal.active .modal-content {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
}

.modal-header h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.close-btn {
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

.close-btn:hover {
    background: var(--error-color);
    color: var(--text-inverse);
}

.download-progress {
    margin-bottom: var(--space-6);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-4);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.download-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.info-item i {
    color: var(--primary-color);
    width: 16px;
}

/* Utility Classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000FF;
        --text-primary: #000000;
        --text-secondary: #000000;
        --border-primary: #000000;
        --bg-primary: #FFFFFF;
        --bg-secondary: #FFFFFF;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .download-modal,
    .carousel-btn {
        display: none !important;
    }
    
    .main-content {
        padding: 0 !important;
    }
    
    * {
        background: white !important;
        color: black !important;
        box-shadow: none !important;
    }
}

/* Ultra-wide screens */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }
}

/* Small mobile devices */
@media (max-width: 374px) {
    .container {
        padding: 0 var(--space-3);
    }
    
    .app-title {
        font-size: var(--font-size-2xl);
    }
    
    .download-btn {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-sm);
    }
    
    .phone-mockup {
        width: 200px;
        height: 400px;
    }
}

/* Landscape mobile optimization */
@media (max-height: 500px) and (orientation: landscape) {
    .hero-section {
        padding: var(--space-6) 0;
    }
    
    .phone-mockup {
        width: 200px;
        height: 350px;
    }
    
    .app-header {
        flex-direction: row;
        gap: var(--space-4);
    }
}

/* Touch optimization */
@media (hover: none) and (pointer: coarse) {
    .nav-link,
    .download-btn,
    .screenshot-item,
    .feature-card {
        -webkit-tap-highlight-color: rgba(25, 118, 210, 0.1);
    }
    
    .download-btn {
        min-height: 48px;
    }
    
    .close-btn {
        min-width: 44px;
        min-height: 44px;
    }
}

/* Promotional Banner */
.promo-banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
    position: relative;
    overflow: hidden;
}

.promo-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shine 4s infinite;
}

.promo-content {
    display: flex;
    align-items: center;
    gap: 20px;
    position: relative;
    z-index: 1;
}

@media (max-width: 640px) {
    .promo-content {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
}

.promo-icon {
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.promo-icon i {
    font-size: 24px;
    color: #ff6b6b;
    animation: flame 2s infinite;
}

.promo-text {
    flex: 1;
}

.promo-text h3 {
    margin: 0 0 5px 0;
    font-size: 18px;
    font-weight: 700;
}

.promo-text p {
    margin: 0;
    font-size: 14px;
    opacity: 0.9;
}

.promo-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.15);
    padding: 10px 15px;
    border-radius: 25px;
    border: 1px solid rgba(255,255,255,0.2);
}

.promo-timer i {
    animation: tick 1s infinite;
    color: #ffeb3b;
}

.promo-timer span {
    font-weight: 600;
    font-size: 14px;
}

@keyframes flame {
    0%, 100% { transform: scale(1); }
    25% { transform: scale(1.1) rotate(-5deg); }
    75% { transform: scale(1.1) rotate(5deg); }
}