/* ===================================
   DiyetAI Landing Page Styles
   Modern, Clean, Professional Design
   =================================== */

/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #10B981;
    --primary-dark: #059669;
    --primary-light: #34D399;
    --secondary-color: #3B82F6;
    --secondary-dark: #2563EB;
    --accent-color: #8B5CF6;
    
    /* Gradient */
    --gradient-primary: linear-gradient(135deg, #10B981 0%, #3B82F6 100%);
    --gradient-secondary: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
    --gradient-accent: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
    --gradient-dark: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
    
    /* Neutrals */
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(16, 185, 129, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-Index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-tooltip: 500;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md), 0 0 20px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), 0 0 30px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
    background: var(--white);
    color: var(--gray-800);
    border: 2px solid var(--gray-200);
}

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

/* Section Styles */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-4xl);
}

.section-badge {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-header h2 {
    margin-bottom: var(--spacing-lg);
}

.section-header p {
    color: var(--gray-600);
    font-size: var(--font-size-lg);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    padding: var(--spacing-lg) 0;
    background: transparent;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-900);
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
}

.nav-links a {
    font-weight: 500;
    color: var(--gray-700);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

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

.mobile-menu-btn {
    display: none;
    font-size: var(--font-size-xl);
    color: var(--gray-700);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-4xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        rgba(16, 185, 129, 0.05) 0%, 
        rgba(59, 130, 246, 0.05) 50%,
        rgba(139, 92, 246, 0.05) 100%
    );
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 1px 1px, var(--gray-200) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.5;
}

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

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
    border-radius: var(--radius-full);
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
}

.hero-badge i {
    color: var(--accent-color);
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-xl);
    line-height: 1.1;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

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

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

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--gray-900);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--gray-200);
}

/* Phone Mockup */
.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.phone-mockup {
    position: relative;
}

.phone-frame {
    width: 280px;
    height: 560px;
    background: var(--gradient-dark);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-2xl), var(--shadow-glow);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--white);
    border-radius: 32px;
    overflow: hidden;
}

.app-preview {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.app-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--gradient-primary);
    color: var(--white);
}

.app-header img {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
}

.app-header span {
    font-weight: 600;
}

.app-content {
    flex: 1;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.calorie-card {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    text-align: center;
}

.calorie-circle {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.calorie-number {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

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

.calorie-info {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.progress-bar {
    height: 6px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    margin-top: var(--spacing-sm);
    overflow: hidden;
}

.progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

.macro-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.macro-card {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
}

.macro-card i {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.macro-card span {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--gray-500);
}

.macro-card strong {
    font-size: var(--font-size-sm);
}

.macro-card.protein i { color: #EF4444; }
.macro-card.carbs i { color: #3B82F6; }
.macro-card.fat i { color: #F59E0B; }

/* Floating Cards */
.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    font-weight: 600;
    font-size: var(--font-size-sm);
    animation: float 3s ease-in-out infinite;
}

.floating-card i {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-md);
}

.card-ai {
    top: 80px;
    left: -40px;
    animation-delay: 0s;
}

.card-camera {
    top: 200px;
    right: -60px;
    animation-delay: 1s;
}

.card-health {
    bottom: 120px;
    left: -20px;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 2px solid var(--gray-300);
    border-radius: 50%;
    color: var(--gray-500);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* ===================================
   Features Section
   =================================== */
.features {
    padding: var(--spacing-4xl) 0;
    background: var(--gray-50);
}

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

.feature-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    transition: all var(--transition-base);
    border: 1px solid var(--gray-100);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.feature-card.featured {
    grid-column: span 2;
    background: var(--gradient-dark);
    color: var(--white);
}

.feature-card.featured h3 {
    color: var(--white);
}

.feature-card.featured p {
    color: var(--gray-300);
}

.feature-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.feature-icon.gradient-bg {
    background: var(--gradient-primary);
    color: var(--white);
}

.feature-card h3 {
    margin-bottom: var(--spacing-md);
}

.feature-card p {
    color: var(--gray-600);
    line-height: 1.7;
}

.feature-list {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--gray-300);
}

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

/* ===================================
   How It Works Section
   =================================== */
.how-it-works {
    padding: var(--spacing-4xl) 0;
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
}

.step-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    position: relative;
    flex: 1;
    max-width: 300px;
    transition: all var(--transition-base);
}

.step-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.step-icon {
    width: 80px;
    height: 80px;
    margin: var(--spacing-lg) auto;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    color: var(--primary-color);
}

.step-card h3 {
    margin-bottom: var(--spacing-md);
}

.step-card p {
    color: var(--gray-600);
    font-size: var(--font-size-sm);
}

.step-connector {
    display: flex;
    align-items: center;
    color: var(--gray-300);
}

.connector-line {
    width: 40px;
    height: 2px;
    background: var(--gray-200);
}

.step-connector i {
    margin-left: var(--spacing-sm);
    color: var(--primary-color);
}

/* ===================================
   AI Showcase Section
   =================================== */
.ai-showcase {
    padding: var(--spacing-4xl) 0;
    background: var(--gradient-dark);
    color: var(--white);
}

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

.ai-text h2 {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.ai-text > p {
    color: var(--gray-300);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
}

.ai-features-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.ai-feature {
    display: flex;
    gap: var(--spacing-lg);
}

.ai-feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.ai-feature-text h4 {
    color: var(--white);
    margin-bottom: var(--spacing-xs);
}

.ai-feature-text p {
    color: var(--gray-400);
    font-size: var(--font-size-sm);
}

/* AI Chat Preview */
.ai-chat-preview {
    background: var(--white);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
}

.chat-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-100);
}

.chat-header img {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
}

.chat-header span {
    font-weight: 600;
    color: var(--gray-800);
}

.online-dot {
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    margin-left: auto;
}

.chat-messages {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.message {
    max-width: 85%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-sm);
}

.message.user {
    background: var(--gradient-primary);
    color: var(--white);
    margin-left: auto;
    border-bottom-right-radius: var(--radius-sm);
}

.message.ai {
    background: var(--gray-100);
    color: var(--gray-800);
    border-bottom-left-radius: var(--radius-sm);
}

.message.ai ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-md);
}

.message.ai li {
    margin-bottom: var(--spacing-xs);
}

/* ===================================
   Download Section
   =================================== */
.download {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(135deg, 
        rgba(16, 185, 129, 0.05) 0%, 
        rgba(59, 130, 246, 0.05) 100%
    );
}

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

.download-text h2 {
    margin-bottom: var(--spacing-lg);
}

.download-text > p {
    color: var(--gray-600);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
}

.download-buttons {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.store-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gray-900);
    color: var(--white);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.store-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.store-button i {
    font-size: var(--font-size-3xl);
}

.store-text {
    display: flex;
    flex-direction: column;
}

.store-text span {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

.store-text strong {
    font-size: var(--font-size-lg);
}

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

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--gray-600);
    font-size: var(--font-size-sm);
}

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

.qr-container {
    text-align: center;
}

.qr-box {
    width: 180px;
    height: 180px;
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-md);
}

.qr-placeholder {
    width: 100%;
    height: 100%;
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
}

.qr-placeholder i {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-sm);
}

.qr-placeholder span {
    font-size: var(--font-size-sm);
}

.qr-container > p {
    color: var(--gray-500);
    font-size: var(--font-size-sm);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.footer-brand > p {
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--gray-800);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: var(--primary-color);
    color: var(--white);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
}

.footer-column h4 {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-base);
}

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

.footer-column a {
    color: var(--gray-400);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-800);
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

.footer-bottom i {
    color: #EF4444;
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text {
        max-width: 100%;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-image {
        display: none;
    }
    
    .feature-card.featured {
        grid-column: span 1;
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .step-connector {
        transform: rotate(90deg);
        margin: var(--spacing-lg) 0;
    }
    
    .ai-content {
        grid-template-columns: 1fr;
    }
    
    .ai-visual {
        order: -1;
    }
    
    .download-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .download-buttons {
        justify-content: center;
    }
    
    .download-info {
        justify-content: center;
    }
    
    .download-visual {
        display: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        padding-top: 100px;
        min-height: auto;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        flex-wrap: wrap;
    }
    
    .stat-divider {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .step-card {
        max-width: 100%;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-info {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .section-header {
        margin-bottom: var(--spacing-2xl);
    }
    
    .feature-card {
        padding: var(--spacing-lg);
    }
    
    .store-button {
        width: 100%;
        justify-content: center;
    }
}