/* ==========================================================================
   Bit2Bus Promotional Website Styles
   ========================================================================== */

/* Root Variables */
:root {
    /* Colors */
    --primary-color: #4CAF50;
    --primary-dark: #388E3C;
    --primary-light: #81C784;
    --secondary-color: #2196F3;
    --secondary-dark: #1976D2;
    --accent-color: #FF9800;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --error-color: #F44336;
    
    /* Neutrals */
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-light: #FFFFFF;
    --background-light: #FAFAFA;
    --background-white: #FFFFFF;
    --background-dark: #1A1A1A;
    --border-light: #E0E0E0;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --shadow-heavy: rgba(0, 0, 0, 0.3);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 80px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Animations */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

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

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

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

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

ul {
    list-style: none;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

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

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

/* ==========================================================================
   Interactive Logo Component
   ========================================================================== */

.interactive-logo {
    position: relative;
    cursor: pointer;
    user-select: none;
    transition: transform var(--transition-normal);
}

.interactive-logo:hover {
    transform: scale(1.05);
}

/* Mobile-specific logo hover states */
@media (hover: hover) and (pointer: fine) {
    .interactive-logo:hover .logo-background {
        background: linear-gradient(135deg, #66BB6A 0%, #4CAF50 50%, #388E3C 100%);
        box-shadow: 0 4px 16px rgba(76, 175, 80, 0.4);
    }
}

@media (hover: none) and (pointer: coarse) {
    .interactive-logo:hover {
        transform: none;
    }
    
    .interactive-logo:active {
        transform: scale(0.95);
    }
    
    .interactive-logo:active .logo-background {
        background: linear-gradient(135deg, #388E3C 0%, #2E7D32 100%);
    }
}

.interactive-logo.small {
    width: 40px;
    height: 40px;
}

.interactive-logo:not(.small):not(.large) {
    width: 60px;
    height: 60px;
}

.interactive-logo.large {
    width: 120px;
    height: 120px;
}

.logo-background {
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    border-radius: 12px;
    padding: 16%;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: box-shadow var(--transition-normal);
}

.interactive-logo:hover .logo-background {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.logo-switches {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.switch-row {
    display: flex;
    justify-content: center;
    gap: 20%;
    height: 30%;
    align-items: center;
}

.switch-label {
    color: white;
    font-weight: 600;
    font-size: 0.3em;
    width: 30%;
    text-align: center;
}

.dip-switches {
    display: flex;
    justify-content: center;
    gap: 25%;
    height: 50%;
}

.dip-switch {
    width: 12%;
    height: 100%;
    background: white;
    border-radius: 3%;
    position: relative;
    cursor: pointer;
    transition: all var(--transition-fast);
}

/* Only scale on desktop */
@media (hover: hover) and (pointer: fine) {
    .dip-switch:hover {
        transform: scale(1.005);
    }
}

.switch-indicator {
    width: 12%;
    height: 12%;
    background: var(--primary-color);
    border-radius: 6%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    transition: all var(--transition-normal);
}

.dip-switch[data-state="off"] .switch-indicator {
    bottom: 10%;  /* OFF = DOWN position = INACTIVE (0) */
}

.dip-switch[data-state="on"] .switch-indicator {
    top: 10%;     /* ON = UP position = ACTIVE (1) */
}

/* Easter Egg Animation */
.interactive-logo.easter-egg-active {
    animation: pulse 1s ease-in-out 3;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

@keyframes pulse-glow {
    0% { 
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(0, 200, 81, 0.4);
    }
    50% { 
        transform: scale(1.05);
        box-shadow: 0 0 0 4px rgba(0, 200, 81, 0.2);
    }
    100% { 
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(0, 200, 81, 0);
    }
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px var(--shadow-light);
}

.nav-container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.nav-brand {
    display: flex;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.brand-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-weight: 500;
    transition: color var(--transition-normal);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero-container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-4xl);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
}

.hero-features {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.feature-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--background-light);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.feature-badge i {
    color: var(--primary-color);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    text-decoration: none;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-light);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(76, 175, 80, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

/* Hero Visual */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    position: relative;
    z-index: 2;
}

.phone-frame {
    width: 280px;
    height: 560px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: 20px;
    padding: 4px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--background-white);
    border-radius: 20px;
    overflow: hidden;
}

.phone-screenshot {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.floating-elements {
    position: absolute;
    inset: -150px;
    pointer-events: none;
}

.floating-card {
    position: absolute;
    background: var(--background-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 15px 40px var(--shadow-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-md);
    font-weight: 600;
    animation: float 6s ease-in-out infinite;
    white-space: nowrap;
    z-index: 1;
}

.floating-card i {
    color: var(--primary-color);
    font-size: var(--font-size-xl);
}

.card-1 {
    top: 20%;
    right: 64%;
    animation-delay: 0s;
}

.card-2 {
    top: 32%;
    left: 64%;
    animation-delay: 2s;
}

.card-3 {
    bottom: 45%;
    right: 65%;
    animation-delay: 4s;
}

.card-4 {
    bottom: 25%;
    left: 65%;
    animation-delay: 6s;
}

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

/* Hero Background */
.hero-background {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.grid-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(76, 175, 80, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(76, 175, 80, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: grid-move 20s linear infinite;
}

@keyframes grid-move {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.gradient-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        rgba(76, 175, 80, 0.05) 0%, 
        rgba(33, 150, 243, 0.05) 100%);
}

/* ==========================================================================
   Features Section
   ========================================================================== */

.features {
    padding: var(--spacing-4xl) 0;
    background: var(--background-light);
}

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

.feature-card {
    background: var(--background-white);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 20px var(--shadow-light);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px var(--shadow-medium);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

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

.feature-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.feature-highlights {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.highlight {
    background: var(--primary-color);
    color: var(--text-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

/* ==========================================================================
   Experimental Features Section
   ========================================================================== */

.experimental-features {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-light);
}

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

.experimental-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.experimental-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-xl);
    padding: var(--spacing-2xl);
    transition: all var(--transition-normal);
}

.experimental-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.experimental-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.experimental-icon i {
    font-size: var(--font-size-xl);
    color: var(--text-light);
}

.experimental-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.experimental-card p {
    opacity: 0.9;
    line-height: 1.6;
}

.easter-egg-hint {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent-color);
}

.hint-label {
    font-weight: 600;
    color: var(--accent-color);
}

.gesture-demo {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.shake-animation {
    font-size: var(--font-size-3xl);
    animation: shake 2s infinite;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-10px); }
    20%, 40%, 60%, 80% { transform: translateX(10px); }
}

/* ==========================================================================
   Benefits Section
   ========================================================================== */

.benefits {
    padding: var(--spacing-4xl) 0;
    background: var(--background-white);
}

.benefits-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.benefits-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.benefit-item {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.benefit-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.benefit-icon i {
    color: var(--text-light);
    font-size: var(--font-size-lg);
}

.benefit-content h4 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.benefit-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.benefits-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.stat-card {
    background: var(--background-light);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    text-align: center;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow-light);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==========================================================================
   Target Audience Section
   ========================================================================== */

.target-audience {
    padding: var(--spacing-4xl) 0;
    background: var(--background-light);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
}

.audience-card {
    background: var(--background-white);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    text-align: center;
    box-shadow: 0 4px 20px var(--shadow-light);
    transition: all var(--transition-normal);
}

.audience-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px var(--shadow-medium);
}

.audience-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

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

.audience-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.audience-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==========================================================================
   Screenshots Section
   ========================================================================== */

.screenshots {
    padding: var(--spacing-4xl) 0;
    background: var(--background-white);
}

.screenshots-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-2xl);
}

.screenshot-item {
    position: relative;
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: 0 8px 30px var(--shadow-light);
    transition: all var(--transition-normal);
}

.screenshot-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px var(--shadow-medium);
}

.screenshot-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.screenshot-item:hover img {
    transform: scale(1.1);
}

.screenshot-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: var(--text-light);
    padding: var(--spacing-xl);
    transform: translateY(100%);
    transition: transform var(--transition-normal);
}

.screenshot-item:hover .screenshot-overlay {
    transform: translateY(0);
}

.screenshot-overlay h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

/* ==========================================================================
   Changelog Section
   ========================================================================== */

.changelog {
    padding: var(--spacing-4xl) 0;
    background: var(--background-light);
}

.changelog-content {
    max-width: 800px;
    margin: 0 auto;
}

.version-card {
    background: var(--background-white);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 20px var(--shadow-light);
    margin-bottom: var(--spacing-2xl);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: box-shadow var(--transition-normal);
}

.version-card:hover {
    box-shadow: 0 8px 30px var(--shadow-medium);
}

.version-card.upcoming {
    background: linear-gradient(135deg, #f8f9ff 0%, #e8f2ff 100%);
    border: 1px solid #d1e7ff;
}

.version-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: var(--spacing-xl);
    color: var(--text-light);
}

.version-card.upcoming .version-header {
    background: linear-gradient(135deg, #4a90e2 0%, #357abd 100%);
}

.version-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.version-number {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin: 0;
}

.version-date {
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.version-badge {
    background: var(--accent-color);
    color: var(--text-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.version-badge.latest {
    background: #00c851;
    animation: pulse-glow 2s ease-in-out infinite;
}

.version-badge.upcoming {
    background: #ff6b35;
}

.version-content {
    padding: var(--spacing-2xl);
}

.version-content h4 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.version-content > p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.changelog-section {
    margin-bottom: var(--spacing-xl);
}

.changelog-section:last-child {
    margin-bottom: 0;
}

.changelog-section h5 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.changelog-section li {
    position: relative;
    padding: var(--spacing-sm) 0 var(--spacing-sm) var(--spacing-xl);
    border-left: 2px solid var(--border-light);
    margin-bottom: var(--spacing-sm);
}

.changelog-section li:last-child {
    margin-bottom: 0;
}

.changelog-section li::before {
    content: '•';
    position: absolute;
    left: -6px;
    top: var(--spacing-sm);
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0;
    border: 2px solid var(--background-white);
}

.changelog-section li strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* ==========================================================================
   Download Section
   ========================================================================== */

.download {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(135deg, var(--background-light), var(--background-white));
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.download-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

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

.download-stat .stat-number {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

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

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 300px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
    text-decoration: none;
    border: 2px solid transparent;
}

.download-btn.primary {
    background: var(--text-primary);
    color: var(--text-light);
}

.download-btn.secondary {
    background: var(--secondary-color);
    color: var(--text-light);
}

.download-btn.coming-soon {
    background: var(--text-secondary);
    color: var(--text-light);
    opacity: 0.7;
    cursor: not-allowed;
}

.download-btn:not(.coming-soon):hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.btn-icon {
    font-size: var(--font-size-2xl);
}

.btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.btn-label {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

.btn-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

/* ==========================================================================
   Technical Specs Section
   ========================================================================== */

.tech-specs {
    padding: var(--spacing-4xl) 0;
    background: var(--background-light);
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.spec-category {
    background: var(--background-white);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 20px var(--shadow-light);
}

.spec-category h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: var(--spacing-sm);
}

.spec-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.spec-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: background var(--transition-normal);
}

.spec-item:hover {
    background: var(--background-light);
}

.spec-item i {
    color: var(--primary-color);
    font-size: var(--font-size-lg);
    width: 20px;
    text-align: center;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact {
    padding: var(--spacing-4xl) 0;
    background: var(--background-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.contact-item {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    color: var(--text-light);
    font-size: var(--font-size-lg);
}

.contact-details h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.contact-details a {
    color: var(--primary-color);
    font-weight: 500;
}

.contact-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.contact-logo {
    position: relative;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background: var(--text-primary);
    color: var(--text-light);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer-brand-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.footer-description {
    opacity: 0.8;
    line-height: 1.6;
}

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

.footer-section h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-section a {
    opacity: 0.8;
    transition: opacity var(--transition-normal);
}

.footer-section a:hover {
    opacity: 1;
}

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

.footer-copyright {
    opacity: 0.8;
}

.footer-easter-egg {
    opacity: 0.6;
    font-size: var(--font-size-sm);
}

/* ==========================================================================
   Back to Top Button
   ========================================================================== */

.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--text-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    box-shadow: 0 4px 20px var(--shadow-medium);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 1000;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px var(--shadow-heavy);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Large Tablet - Keep floating cards */
@media (max-width: 768px) and (min-width: 601px) {
    :root {
        --font-size-6xl: 2.5rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
    }
    
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }
    
    .hero-text {
        order: 2;
    }
    
    .hero-visual {
        order: 1;
    }
    
    .phone-frame {
        width: 280px;
        height: 560px;
    }
    
    /* Adjust floating cards for medium tablets */
    .card-1 { right: 25%; }
    .card-2 { left: 20%; }
    .card-3 { right: 30%; }
    .card-4 { left: 25%; }
    
    .benefits-content,
    .download-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer-main {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

/* Small Tablet and Mobile */
@media (max-width: 600px) {
    
    .phone-frame {
        width: 240px;
        height: 480px;
    }
    
    
    .benefits-content,
    .download-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer-main {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

/* Small Tablet and Mobile Navigation */
@media (max-width: 600px) {
    /* Smaller, cleaner logo for mobile */
    .interactive-logo:not(.small):not(.large) {
        width: 36px;
        height: 36px;
    }
    
    /* Simplify and SHRINK logo elements on mobile */
    .logo-background {
        border-radius: 6px;
        padding: 18%;
        box-shadow: 0 2px 6px rgba(76, 175, 80, 0.25);
    }
    
    .switch-row {
        height: 20%;
        margin-bottom: 5%;
    }
    
    .switch-label {
        font-size: 0.25em;
        font-weight: 600;
    }
    
    .dip-switches {
        height: 60%;
        gap: 60%;
    }
    
    .dip-switch {
        width: 10%;
        border-radius: 4%;
        box-shadow: inset 0 0.5px 1px rgba(0,0,0,0.1);
    }
    
    .switch-indicator {
        width: 10%;
        height: 10%;
        border-radius: 4%;
        box-shadow: 0 0.5px 1px rgba(0,0,0,0.15);
    }
    
    .brand-name {
        font-size: var(--font-size-xl);
        font-weight: 700;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--background-white);
        flex-direction: column;
        padding: var(--spacing-xl);
        box-shadow: 0 8px 30px var(--shadow-medium);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        z-index: 999;
        max-height: calc(100vh - var(--header-height));
        overflow-y: auto;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        padding: var(--spacing-md) 0;
        border-bottom: 1px solid var(--border-light);
        font-size: var(--font-size-lg);
        text-align: center;
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .nav-toggle {
        display: flex;
        width: 30px;
        height: 30px;
        padding: var(--spacing-xs);
        touch-action: manipulation;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    /* Prevent body scroll when menu is open */
    body.menu-open {
        overflow: hidden;
        position: fixed;
        width: 100%;
    }
    
    /* Add backdrop when menu is open */
    .nav-backdrop {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 998;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-backdrop.active {
        opacity: 1;
        visibility: visible;
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
        --spacing-3xl: 2.5rem;
        --spacing-4xl: 3rem;
        --font-size-6xl: 2rem;
        --font-size-5xl: 1.75rem;
        --font-size-4xl: 1.5rem;
        --font-size-3xl: 1.25rem;
        --font-size-2xl: 1.125rem;
    }
    
    /* Compact logo on small mobile */
    .interactive-logo:not(.small):not(.large) {
        width: 34px;
        height: 34px;
    }
    
    .logo-background {
        border-radius: 5px;
        padding: 20%;
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
        box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
    }
    
    .switch-label {
        font-size: 0.2em;
        font-weight: 700;
        text-shadow: none;
    }
    
    .switch-indicator {
        width: 8%;
        height: 8%;
        background: #ffffff;
        box-shadow: 0 0.5px 1px rgba(0,0,0,0.2);
        border-radius: 3%;
    }
    
    .brand-name {
        font-size: var(--font-size-lg);
        font-weight: 700;
        text-shadow: none;
    }
    
    .logo-container {
        gap: var(--spacing-sm);
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-container {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-features {
        justify-content: center;
        gap: var(--spacing-sm);
    }
    
    .feature-badge {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: var(--font-size-xs);
    }
    
    .hero-buttons {
        justify-content: center;
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-sm);
        min-width: 200px;
        justify-content: center;
    }
    
    .phone-frame {
        width: 180px;
        height: 360px;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .feature-card {
        padding: var(--spacing-lg);
    }
    
    .experimental-grid {
        grid-template-columns: 1fr;
    }
    
    .experimental-card {
        padding: var(--spacing-lg);
    }
    
    .audience-grid {
        grid-template-columns: 1fr;
    }
    
    .screenshots-gallery {
        grid-template-columns: 1fr;
    }
    
    .download-stats {
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
    
    .download-buttons {
        max-width: 100%;
        width: 100%;
    }
    
    .download-btn {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .benefits-stats {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
    }
    
    .stat-card {
        padding: var(--spacing-lg);
    }
    
    .specs-grid {
        grid-template-columns: 1fr;
    }
    
    .spec-category {
        padding: var(--spacing-lg);
    }
    
    .floating-card {
        display: none;
    }
    
    .version-card {
        margin-bottom: var(--spacing-lg);
    }
    
    .version-content {
        padding: var(--spacing-lg);
    }
    
    .footer {
        padding: var(--spacing-2xl) 0 var(--spacing-lg);
    }
    
    .footer-main {
        gap: var(--spacing-xl);
        margin-bottom: var(--spacing-lg);
    }
    
    .footer-links {
        gap: var(--spacing-lg);
    }
    
    /* Improve logo readability on mobile */
    .logo-background {
        border-radius: 10px;
        box-shadow: 0 3px 12px rgba(0, 0, 0, 0.15);
    }
    
    .switch-label {
        font-size: 0.65em;
        font-weight: 700;
    }
    
    .switch-indicator {
        border-radius: 12%;
    }
    
    /* Better navbar spacing */
    .navbar {
        height: 70px;
    }
    
    :root {
        --header-height: 70px;
    }
    
    .nav-container {
        padding: 0 var(--spacing-md);
    }
}

.dip-switch {
    width: 25%;
    height: 100%;
    background: white;
    border-radius: 8%;
    position: relative;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.switch-indicator {
    width: 40%;
    height: 30%;
    background: var(--primary-color);
    border-radius: 12%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    transition: all var(--transition-normal);
}

.switch-label {
    font-size: 0.6em;
    font-weight: 600;
}

/* Very small screens (iPhone SE, etc.) */
@media (max-width: 375px) {
    .interactive-logo:not(.small):not(.large) {
        width: 30px;
        height: 30px;
    }
    
    .brand-name {
        font-size: var(--font-size-base);
        font-weight: 600;
    }
    
    .navbar {
        height: 65px;
    }
    
    :root {
        --header-height: 65px;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .nav-container {
        padding: 0 var(--spacing-sm);
    }
    
    /* Compact logo styling for tiny screens */
    .logo-background {
        background: linear-gradient(135deg, #4CAF50 0%, #388E3C 100%);
        box-shadow: 0 1px 4px rgba(76, 175, 80, 0.3);
        border: none;
        padding: 22%;
    }
    
    .switch-label {
        font-size: 0.15em;
    }
    
    /* Tiny screen switches - normal size */
    .switch-indicator {
        width: 45%;
        height: 30%;
    }
}

/* ==========================================================================
   Animations & Transitions
   ========================================================================== */

/* AOS (Animate On Scroll) custom styles */
[data-aos] {
    pointer-events: none;
}

[data-aos].aos-animate {
    pointer-events: auto;
}

/* Loading states */
img {
    transition: opacity var(--transition-normal);
}

img:not([src]) {
    opacity: 0;
}

/* Focus states for accessibility */
.btn:focus,
.nav-link:focus,
.download-btn:focus,
.nav-toggle:focus,
.interactive-logo:focus,
.dip-switch:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Touch improvements */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .nav-link,
    .download-btn,
    .nav-toggle,
    .interactive-logo,
    .dip-switch {
        min-height: 44px;
        min-width: 44px;
    }
    
    .feature-card:hover,
    .screenshot-item:hover,
    .audience-card:hover {
        transform: none;
    }
    
    .btn:hover {
        transform: none;
    }
    
    .btn:active {
        transform: scale(0.95);
    }
    
    /* NO scaling on touch devices - keep switches tiny */
    .dip-switch:hover {
        transform: none !important;
    }
    
    .dip-switch:active {
        transform: none !important;
    }
    
    /* Force remove any scaling and make TINY */
    /* Mobile switches - VISIBLE SIZE */
    .dip-switch {
        width: 10px !important;
        height: 18px !important;
        min-width: 10px !important;
        max-width: 10px !important;
        min-height: 18px !important;
        max-height: 18px !important;
    }
    
    .switch-indicator {
        width: 5px !important;
        height: 5px !important;
        min-width: 5px !important;
        max-width: 5px !important;
        min-height: 5px !important;
        max-height: 5px !important;
    }
    
    .dip-switches {
        height: 20px !important;
        gap: 6px !important;
        min-height: 20px !important;
        max-height: 20px !important;
    }
    
    .switch-label {
        font-size: 8px !important;
        line-height: 8px !important;
    }
}

/* Print styles */
@media print {
    .navbar,
    .back-to-top,
    .floating-elements {
        display: none !important;
    }
    
    .hero {
        min-height: auto;
        padding: var(--spacing-xl) 0;
    }
    
    section {
        page-break-inside: avoid;
        padding: var(--spacing-lg) 0;
    }
}