/* ============================================
   Mubit Landing Page - Liquid Glass Design System
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
    /* Brand Colors */
    --accent-primary: #1E8C60;
    --accent-primary-pressed: #166A49;
    --accent-primary-soft: rgba(30, 140, 96, 0.12);
    
    /* Light Theme */
    --bg-primary-light: #F7F8FA;
    --bg-secondary-light: #FFFFFF;
    --border-light: #D9DDE3;
    --text-primary-light: #0B1220;
    --text-secondary-light: #4B5565;
    --text-tertiary-light: #7B8796;
    --icon-primary-light: #1F2A37;
    
    /* Dark Theme */
    --bg-primary-dark: #0B0F17;
    --bg-secondary-dark: #0F1623;
    --border-dark: #243041;
    --text-primary-dark: #F2F5F8;
    --text-secondary-dark: #B9C2CE;
    --text-tertiary-dark: #8E9AAD;
    --icon-primary-dark: #D5DCE6;
    
    /* Active Theme (Light by default) */
    --bg-primary: var(--bg-primary-light);
    --bg-secondary: var(--bg-secondary-light);
    --border-color: var(--border-light);
    --text-primary: var(--text-primary-light);
    --text-secondary: var(--text-secondary-light);
    --text-tertiary: var(--text-tertiary-light);
    --icon-primary: var(--icon-primary-light);
    
    /* Typography */
    --font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --space-4: 4px;
    --space-8: 8px;
    --space-12: 12px;
    --space-16: 16px;
    --space-20: 20px;
    --space-24: 24px;
    --space-32: 32px;
    --space-40: 40px;
    --space-48: 48px;
    --space-64: 64px;
    --space-80: 80px;
    
    /* Border Radius */
    --radius-12: 12px;
    --radius-16: 16px;
    --radius-20: 20px;
    --radius-28: 28px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: var(--bg-primary-dark);
    --bg-secondary: var(--bg-secondary-dark);
    --border-color: var(--border-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --text-tertiary: var(--text-tertiary-dark);
    --icon-primary: var(--icon-primary-dark);
    
    --glass-bg: rgba(15, 22, 35, 0.7);
    --glass-border: rgba(36, 48, 65, 0.5);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-24);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

/* Glass Card Component */
.glass-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-16);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    border-color: var(--accent-primary);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-20) 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .nav {
    background: rgba(11, 15, 23, 0.95);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-12);
    font-weight: 700;
    font-size: 24px;
}

.logo {
    font-size: 32px;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-32);
}

.nav-links a {
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

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

.theme-toggle {
    background: transparent;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: var(--space-8);
    border-radius: var(--radius-12);
    transition: background 0.3s ease;
}

.theme-toggle:hover {
    background: var(--accent-primary-soft);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--space-8);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Buttons */
.btn-primary {
    background: var(--accent-primary);
    color: white;
    padding: 16px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn-primary:hover {
    background: var(--accent-primary-pressed);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(30, 140, 96, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    padding: 16px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    border: 2px solid var(--border-color);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-3px);
}

.btn-large {
    padding: 18px 40px;
    font-size: 17px;
}

/* Hero Section */
.hero {
    position: relative;
    padding: 140px 0 100px;
    overflow: hidden;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-64);
    align-items: center;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: var(--space-24);
    line-height: 1.2;
    color: var(--text-primary);
}

.gradient-text {
    color: var(--accent-primary);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: var(--space-40);
    line-height: 1.8;
    max-width: 540px;
}

.hero-cta {
    display: flex;
    gap: var(--space-16);
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-phone {
    width: 100%;
    max-width: 450px;
    height: auto;
    border-radius: var(--radius-20);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: var(--space-20);
    line-height: 1.3;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 600px;
    margin: 0 auto;
}

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-40);
}

.feature-card {
    padding: var(--space-40);
    text-align: left;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-16);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-primary);
}

.feature-icon {
    font-size: 56px;
    margin-bottom: var(--space-24);
    display: block;
}

.feature-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--space-16);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 16px;
}

/* Screenshots Showcase */
.showcase {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.screenshots-carousel {
    display: flex;
    gap: var(--space-24);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: var(--space-16) 0;
    -webkit-overflow-scrolling: touch;
}

.screenshots-carousel::-webkit-scrollbar {
    height: 8px;
}

.screenshots-carousel::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.screenshots-carousel::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.screenshots-carousel::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

.screenshot-item {
    text-align: center;
    flex: 0 0 auto;
    scroll-snap-align: center;
    min-width: 220px;
}

.screenshot-item img {
    width: 100%;
    max-width: 220px;
    height: auto;
    border-radius: var(--radius-20);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--space-16);
    transition: transform 0.3s ease;
}

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

.screenshot-caption h4 {
    font-size: 18px;
    margin-bottom: var(--space-8);
}

.screenshot-caption p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Challenges Section */
.challenges-section {
    padding: 100px 0;
    background: var(--bg-primary);
}

.challenges-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-80);
    align-items: center;
}

.challenges-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.section-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: var(--space-32);
    line-height: 1.6;
}

.challenges-features {
    list-style: none;
}

.challenges-features li {
    display: flex;
    align-items: center;
    gap: var(--space-16);
    margin-bottom: var(--space-20);
    font-size: 18px;
}

.challenges-features svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

/* Insights Section */
.insights-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.insights-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-80);
    align-items: center;
}

.challenges-image img,
.insights-image img {
    width: 100%;
    max-width: 350px;
    height: auto;
    border-radius: var(--radius-20);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.insights-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-20);
    margin-top: var(--space-32);
}

.insight-stat {
    padding: var(--space-24);
    text-align: center;
}

.insight-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: var(--space-8);
}

.insight-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Premium Section */
.premium-section {
    padding: 100px 0;
    background: var(--bg-primary);
}

.premium-card {
    padding: var(--space-64);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.premium-title {
    font-size: 42px;
    margin-bottom: var(--space-16);
}

.premium-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: var(--space-32);
}

.premium-features {
    list-style: none;
    text-align: left;
    max-width: 500px;
    margin: 0 auto var(--space-40);
}

.premium-features li {
    font-size: 18px;
    margin-bottom: var(--space-16);
    padding-left: var(--space-32);
}

/* Download Section */
.download-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

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

.download-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-24);
    margin-top: var(--space-40);
}

.store-button {
    display: flex;
    align-items: center;
    gap: var(--space-16);
    padding: var(--space-16) var(--space-32);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-16);
    transition: all 0.3s ease;
}

.store-button:hover:not(.disabled) {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

.store-button.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.store-text {
    text-align: left;
}

.store-label {
    font-size: 12px;
    color: var(--text-tertiary);
}

.store-name {
    font-size: 18px;
    font-weight: 600;
}

/* Footer */
.footer {
    padding: var(--space-64) 0 var(--space-32);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--space-64);
    margin-bottom: var(--space-48);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-12);
    font-weight: 700;
    font-size: 24px;
    margin-bottom: var(--space-16);
}

.footer-tagline {
    color: var(--text-secondary);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-32);
}

.footer-column h4 {
    font-size: 16px;
    margin-bottom: var(--space-16);
    color: var(--text-primary);
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    margin-bottom: var(--space-12);
    font-size: 14px;
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-32);
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-32);
    }
    
    .hero-content,
    .challenges-content,
    .insights-content {
        grid-template-columns: 1fr;
        gap: var(--space-48);
    }
    
    .insights-content .insights-image {
        order: -1;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .section-title {
        font-size: 36px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--space-32);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .insights-stats {
        grid-template-columns: 1fr;
    }
    
    .hero-phone,
    .challenges-image img,
    .insights-image img {
        max-width: 320px;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-cta a {
        width: 100%;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .store-button {
        width: 100%;
        max-width: 300px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .feature-card {
        padding: var(--space-32);
    }
}

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

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

/* Smooth Transitions */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}