/* ===== CSS RESET ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== CSS VARIABLES ===== */
:root {
    /* Light Theme Colors */
    --primary-color: #ef4444;
    --primary-hover: #dc2626;
    --secondary-color: #6b7280;
    --background-color: #ffffff;
    --surface-color: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    --gradient-secondary: linear-gradient(135deg, #6b7280 0%, #4b5563 100%);
    
    /* Spacing */
    --container-max-width: 1200px;
    --section-padding: 100px 0;
    --card-padding: 24px;
    
    /* 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;
    
    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --primary-color: #ef4444;
    --primary-hover: #f87171;
    --secondary-color: #9ca3af;
    --background-color: #1b1c1e;
    --surface-color: #27282d;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --border-color: #374151;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
}

/* ===== BASE STYLES ===== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--background-color);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--line-height-tight);
    margin-bottom: 1rem;
}

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);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 12px 24px;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(239, 68, 68, 0.4);
}

.btn-secondary {
    background: var(--surface-color);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

.btn-premium {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #1f2937;
    box-shadow: 0 4px 12px rgba(251, 191, 36, 0.3);
}

.btn-premium:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(251, 191, 36, 0.4);
}

.btn-large {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
}

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

[data-theme="dark"] .navbar {
    background: rgba(27, 28, 30, 0.95);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-normal);
}

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

.theme-toggle {
    position: relative;
    width: 44px;
    height: 44px;
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.theme-toggle i {
    position: absolute;
    font-size: 18px;
    transition: all var(--transition-normal);
}

.light-icon {
    color: #fbbf24;
    opacity: 0;
    transform: rotate(180deg);
}

.dark-icon {
    color: #6366f1;
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="dark"] .light-icon {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="dark"] .dark-icon {
    opacity: 0;
    transform: rotate(-180deg);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
}

/* ===== HERO SECTION ===== */
.hero {
    padding: 140px 0 100px;
    background: var(--background-color);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(239, 68, 68, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(239, 68, 68, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-title {
    font-size: var(--font-size-6xl);
    line-height: var(--line-height-tight);
    margin-bottom: 24px;
}

.hero-description {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--primary-color);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: 4px;
}

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

.hero-image-container {
    position: relative;
    z-index: 2;
    max-width: 280px;
    margin: 0 auto;
}

.hero-screenshot {
    width: 100%;
    height: auto;
    border-radius: 16px;
    transition: opacity 0.3s ease;
}

.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.floating-icon {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 8px 32px var(--shadow-medium);
    animation: float 3s ease-in-out infinite;
}

.floating-icon.pdf {
    color: #ef4444;
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.floating-icon.word {
    color: #2563eb;
    top: 60%;
    left: 5%;
    animation-delay: 0.5s;
}

.floating-icon.excel {
    color: #059669;
    bottom: 20%;
    right: 5%;
    animation-delay: 1s;
}

.floating-icon.ppt {
    color: #ea580c;
    top: 30%;
    left: 5%;
    animation-delay: 1.5s;
}

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

/* ===== SECTIONS ===== */
.section-header {
    text-align: center;
    margin-bottom: 80px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: 24px;
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ===== FEATURES SECTION ===== */
.features {
    padding: var(--section-padding);
    background: var(--surface-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--background-color);
    padding: var(--card-padding);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
    transform-origin: left;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow-medium);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: rgba(239, 68, 68, 0.1);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.feature-title {
    font-size: var(--font-size-xl);
    margin-bottom: 16px;
}

.feature-description {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ===== APP SCREENS SECTION ===== */
.app-screens {
    padding: var(--section-padding);
    background: var(--background-color);
}

.screens-showcase {
    margin-bottom: 60px;
    position: relative;
    min-height: 500px; /* Increased to accommodate content without height jumps */
}

.screen-item {
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 60px;
}

.screen-item.active {
    display: grid;
}

.screen-mockup {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
}

.screen-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-2xl);
    transition: all var(--transition-slow);
}

.screen-title {
    font-size: var(--font-size-3xl);
    margin-bottom: 20px;
}

.screen-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: 24px;
}

.screen-features {
    list-style: none;
    padding: 0;
}

.screen-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-weight: 500;
}

.screen-features i {
    color: var(--primary-color);
    font-size: var(--font-size-sm);
}

.screen-nav {
    display: flex;
    justify-content: center;
    gap: 16px;
    background: var(--surface-color);
    padding: 20px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.screen-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 24px;
    background: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    color: var(--text-secondary);
    font-weight: 500;
}

.screen-nav-btn.active,
.screen-nav-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.screen-nav-btn i {
    font-size: 20px;
}

.screen-nav-btn span {
    font-size: var(--font-size-sm);
}

/* ===== PDF TOOLS SECTION ===== */
.pdf-tools {
    padding: var(--section-padding);
    background: var(--surface-color);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.tool-card {
    background: var(--background-color);
    padding: var(--card-padding);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.05) 0%, rgba(99, 102, 241, 0.05) 100%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow-medium);
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: white;
    margin: 0 auto 24px;
    position: relative;
    z-index: 1;
}

.tool-title {
    font-size: var(--font-size-xl);
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.tool-description {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    position: relative;
    z-index: 1;
}

/* ===== PREMIUM SECTION ===== */
.premium {
    padding: var(--section-padding);
    background: var(--background-color);
    position: relative;
    overflow: hidden;
}

.premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 70% 30%, rgba(251, 191, 36, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.premium-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.premium-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #1f2937;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-sm);
    font-weight: 700;
    margin-bottom: 24px;
}

.premium-title {
    font-size: var(--font-size-4xl);
    margin-bottom: 24px;
}

.premium-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: 40px;
}

.premium-features {
    margin-bottom: 40px;
}

.premium-feature {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 24px;
}

.premium-feature i {
    width: 40px;
    height: 40px;
    background: rgba(251, 191, 36, 0.1);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #f59e0b;
    flex-shrink: 0;
}

.feature-content h4 {
    font-size: var(--font-size-lg);
    margin-bottom: 4px;
}

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

.premium-pricing {
    margin-bottom: 32px;
}

.price {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: 8px;
}

.currency {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--primary-color);
}

.amount {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    color: var(--primary-color);
}

.period {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

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

.premium-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.premium-mockup {
    position: relative;
    max-width: 320px;
}

.premium-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-2xl);
    
}

/* ===== DOWNLOAD SECTION ===== */
.download {
    padding: var(--section-padding);
    background: var(--surface-color);
    text-align: center;
}

.download-title {
    font-size: var(--font-size-4xl);
    margin-bottom: 24px;
}

.download-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: 60px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 60px;
}

.download-btn {
    transition: all var(--transition-normal);
}

.download-btn:hover {
    transform: translateY(-4px);
}

.download-btn img {
    height: 60px;
    width: auto;
}

.ios-coming-soon {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: not-allowed;
    opacity: 0.7;
}

.ios-content {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
}

.ios-content i {
    font-size: 32px;
}

.ios-title {
    font-weight: 600;
    font-size: var(--font-size-base);
}

.ios-subtitle {
    font-size: var(--font-size-sm);
}

.download-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

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

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

.footer-description {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

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

.footer-links li {
    margin-bottom: 12px;
}

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

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

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

.footer-social {
    display: flex;
    gap: 16px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-normal);
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
    .hero-container,
    .screen-item,
    .premium-content {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2.5rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .hero-stats {
        gap: 32px;
    }
    
    .hero-image-container {
        max-width: 240px;
    }
    
    .features-grid,
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .screens-showcase {
        min-height: 600px; /* Adjust for mobile content height */
    }
    
    .screen-item {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .screen-nav {
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .screen-nav-btn {
        padding: 12px 16px;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-stats {
        gap: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .nav-container {
        padding: 0 16px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }
    
    .section-header {
        margin-bottom: 60px;
    }
    
    .premium-feature {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.animate {
    opacity: 1;
    transform: translateY(0);
}

/* ===== MOBILE MENU STYLES ===== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--surface-color);
        border-top: 1px solid var(--border-color);
        box-shadow: 0 4px 20px var(--shadow-medium);
        padding: 20px;
        flex-direction: column;
        gap: 20px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        z-index: 1001;
        display: flex !important;
    }
    
    .nav-menu.mobile-open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        padding: 12px 0;
        font-size: var(--font-size-lg);
        font-weight: 600;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .theme-toggle {
        align-self: center;
        margin: 10px 0;
    }
    
    .download-btn {
        align-self: center;
        margin-top: 10px;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
}

/* ===== RIPPLE ANIMATION ===== */
@keyframes ripple {
    0% {
        transform: scale(0);
        opacity: 1;
    }
    100% {
        transform: scale(4);
        opacity: 0;
    }
}

/* ===== NAVBAR SCROLLED STATE ===== */
.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(27, 28, 30, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

/* ===== 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;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none; }
.block { display: block; }
.flex { display: flex; }
.grid { display: grid; }

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

.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.m-1 { margin: 0.25rem; }
.m-2 { margin: 0.5rem; }
.m-3 { margin: 0.75rem; }
.m-4 { margin: 1rem; }
.m-6 { margin: 1.5rem; }
.m-8 { margin: 2rem; }

/* ===== LAZY LOADING STYLES ===== */
.image-placeholder {
    position: relative;
    display: inline-block;
    width: 100%;
    height: auto;
    
    border-radius: inherit;
    overflow: hidden;
}

.image-placeholder[data-loaded="false"] {
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lazy-image {
    width: 100%;
    height: auto;
    opacity: 0;
    transition: opacity 0.3s ease;
    display: block;
}

.lazy-image.loaded {
    opacity: 1;
}

.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: block;
}

.image-placeholder[data-loaded="true"] .loading-spinner {
    display: none;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Specific adjustments for different image containers */
.hero-image-container .image-placeholder {
    border-radius: 16px;
}

.screen-mockup .image-placeholder {
    border-radius: var(--radius-2xl);
}

.premium-mockup .image-placeholder {
    border-radius: var(--radius-2xl);
}

.download-btn .image-placeholder {
    display: inline-block;
    background: transparent;
    min-height: 60px;
    width: auto;
}

.download-btn .lazy-image {
    height: 60px;
    width: auto;
}

.download-btn .loading-spinner {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

/* Hero image specific sizing */
.hero-image-container .image-placeholder[data-loaded="false"] {
    min-height: 500px;
}

/* Screen images specific sizing */
.screen-mockup .image-placeholder[data-loaded="false"] {
    min-height: 600px;
}

/* Premium image specific sizing */
.premium-mockup .image-placeholder[data-loaded="false"] {
    min-height: 600px;
}