/**
 * Corixa Shared Styles
 * Version: 2.1 - Unified, accessible, performant
 */

/* ============================================
   CSS Reset and Variables
   ============================================ */
:root {
    /* Enhanced Color System with Systematic Shades */
    --primary-50: #f5f3ff;
    --primary-100: #ede9fe;
    --primary-200: #ddd6fe;
    --primary-300: #c4b5fd;
    --primary-400: #a78bfa;
    --primary-500: #8b5cf6;
    --primary-600: #7c3aed;
    --primary-700: #6d28d9;
    --primary-800: #5b21b6;
    --primary-900: #4c1d95;

    /* Main Colors */
    --primary-color: var(--primary-800);
    --primary-light: var(--primary-600);
    --primary-dark: var(--primary-900);

    /* Accent Colors */
    --accent-color: #06b6d4;
    --accent-light: #22d3ee;
    --accent-dark: #0891b2;

    /* Neutral Colors */
    --text-dark: #1e293b;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --bg-light: #f8fafc;
    --bg-lighter: #ffffff;
    --bg-dark: #0f172a;
    --white: #ffffff;

    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    /* Gradients */
    --gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    --gradient-subtle: linear-gradient(135deg, var(--primary-100) 0%, var(--primary-200) 100%);

    /* Enhanced Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);

    /* Layout & Spacing (8px Grid System) */
    --max-width: 1280px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 80px;
    --spacing-5xl: 96px;

    /* Typography Scale */
    --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    --font-size-base: clamp(1rem, 0.925rem + 0.375vw, 1.125rem);
    --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
    --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
    --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 1.875rem);
    --font-size-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.25rem);
    --font-size-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3rem);
    --font-size-5xl: clamp(3rem, 2rem + 5vw, 4rem);

    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.75;

    /* Letter Spacing */
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;

    /* Animation Timing */
    --transition-fast: 200ms;
    --transition-base: 300ms;
    --transition-slow: 400ms;
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
}

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

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

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

*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* ============================================
   Motion Preference Support
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .hero::before {
        animation: none !important;
    }

    .hero {
        animation: none !important;
        background-size: 100% 100% !important;
    }

    .badge {
        animation: none !important;
    }
}

/* ============================================
   Base Typography
   ============================================ */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-dark);
    background-color: var(--bg-lighter);
    overflow-x: hidden;
    font-weight: 400;
    letter-spacing: var(--letter-spacing-normal);
    font-feature-settings: 'cv11', 'ss01', 'ss03';
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Enhanced heading rendering */
h1, h2, h3, h4, h5, h6 {
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

/* ============================================
   Skip Link (Accessibility)
   ============================================ */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    border-radius: 0 0 var(--spacing-sm) 0;
    z-index: 2000;
    font-weight: 600;
    transition: top var(--transition-fast) var(--ease-out);
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

/* ============================================
   Header & Navigation
   ============================================ */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base) var(--ease-out);
}

header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

header.hidden {
    transform: translateY(-100%);
}

/* Progress Indicator */
.progress-indicator {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--gradient);
    width: 0%;
    transition: width var(--transition-fast) var(--ease-out);
    z-index: 1001;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: var(--letter-spacing-tight);
    transition: all var(--transition-base) var(--ease-in-out);
}

.logo:hover {
    color: var(--primary-light);
    transform: translateY(-1px);
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
    list-style: none;
}

.nav-links a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    letter-spacing: var(--letter-spacing-wide);
    transition: color var(--transition-base) var(--ease-in-out);
    position: relative;
}

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

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

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

/* Dropdown Menu Styles */
.dropdown {
    position: relative;
}

.dropdown-toggle::after {
    content: ' \25BE';
    font-size: 0.8em;
    opacity: 0.7;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    border-radius: var(--spacing-sm);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base) var(--ease-out);
    list-style: none;
    padding: var(--spacing-sm) 0;
    margin-top: var(--spacing-sm);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--text-dark);
    text-decoration: none;
    transition: all var(--transition-base) var(--ease-out);
    font-size: var(--font-size-sm);
}

.dropdown-menu a::after {
    display: none;
}

.dropdown-menu a:hover {
    background: var(--primary-50);
    color: var(--primary-dark);
}

/* ============================================
   Mobile Menu
   ============================================ */
.mobile-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    z-index: 1001;
}

.mobile-menu span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    margin: 5px 0;
    transition: all 0.3s ease;
    transform-origin: center;
}

/* Mobile menu open state */
.mobile-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Navigation Panel */
.mobile-nav {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-lg);
    z-index: 999;
    flex-direction: column;
    gap: var(--spacing-md);
    max-height: calc(100vh - 60px);
    overflow-y: auto;
}

.mobile-nav.active {
    display: flex;
}

.mobile-nav a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--bg-light);
    transition: color var(--transition-base);
}

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

.mobile-nav .mobile-nav-section {
    padding: var(--spacing-sm) 0;
}

.mobile-nav .mobile-nav-section-title {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    margin-bottom: var(--spacing-sm);
}

.mobile-nav .mobile-nav-section a {
    padding-left: var(--spacing-md);
    font-size: var(--font-size-sm);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu {
        display: block;
    }
}

/* ============================================
   Hero Section (Simplified Animations)
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-5xl) 0 var(--spacing-4xl);
    background: linear-gradient(135deg, var(--bg-light) 0%, rgba(124, 58, 237, 0.05) 100%);
    position: relative;
    overflow: hidden;
}

/* Simplified: Single subtle background animation */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

/* Simplified badge - no pulse animation */
.badge {
    display: inline-block;
    background: var(--accent-color);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
}

h1 {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-lg);
    letter-spacing: var(--letter-spacing-tight);
    text-rendering: optimizeLegibility;
}

.hero p {
    font-size: var(--font-size-lg);
    color: var(--text-light);
    margin-bottom: var(--spacing-2xl);
    line-height: var(--line-height-relaxed);
    max-width: 65ch;
    margin-left: auto;
    margin-right: auto;
}

/* Hero Buttons */
.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

/* ============================================
   Buttons
   ============================================ */
.btn,
.cta-button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--spacing-sm);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base) var(--ease-out);
}

.btn-primary,
.cta-button.primary,
.cta-button:not(.secondary) {
    background: var(--gradient);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover,
.cta-button.primary:hover,
.cta-button:not(.secondary):hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary,
.cta-button.secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    box-shadow: none;
}

.btn-secondary:hover,
.cta-button.secondary:hover {
    background: var(--primary-50);
    border-color: var(--primary-dark);
    color: var(--primary-dark);
}

/* ============================================
   Section Styles
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-header h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-tight);
    text-rendering: optimizeLegibility;
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Feature Cards
   ============================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--white);
    padding: var(--spacing-2xl);
    border-radius: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base) var(--ease-out);
    position: relative;
    overflow: hidden;
    border: 1px solid transparent;
}

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

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-100);
}

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

.feature-icon {
    width: var(--spacing-3xl);
    height: var(--spacing-3xl);
    margin: 0 auto var(--spacing-lg);
    background: var(--gradient);
    border-radius: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: var(--white);
    transition: transform var(--transition-base) var(--ease-out);
}

.feature-card:hover .feature-icon {
    transform: scale(1.05);
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    letter-spacing: var(--letter-spacing-tight);
    text-align: center;
}

.feature-card p {
    color: var(--text-light);
    line-height: var(--line-height-relaxed);
    font-size: var(--font-size-base);
    text-align: center;
}

/* ============================================
   Screenshots Section
   ============================================ */
.screenshots {
    padding: var(--spacing-4xl) 0;
    background: var(--bg-light);
}

.screenshots h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-3xl);
    text-rendering: optimizeLegibility;
}

.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
}

.screenshot-item {
    background: var(--white);
    border-radius: var(--spacing-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    aspect-ratio: 16 / 10;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

/* ============================================
   Use Cases / Steps Section
   ============================================ */
.use-cases,
.how-it-works {
    padding: var(--spacing-4xl) 0;
}

.use-cases h2,
.how-it-works h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-3xl);
    text-rendering: optimizeLegibility;
}

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

.use-case,
.step {
    text-align: center;
}

.use-case-icon {
    font-size: var(--spacing-3xl);
    margin-bottom: var(--spacing-md);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--gradient);
    color: var(--white);
    border-radius: 50%;
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.use-case h3,
.step h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.use-case p,
.step p {
    color: var(--text-light);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Download Section
   ============================================ */
.download {
    padding: var(--spacing-4xl) 0;
    background: var(--bg-light);
}

.download h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-3xl);
    text-rendering: optimizeLegibility;
}

.download-box {
    max-width: 600px;
    margin: 0 auto;
    background: var(--white);
    padding: var(--spacing-3xl);
    border-radius: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: all var(--transition-base) var(--ease-out);
}

.download-box:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.download-box h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.download-box p {
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
}

.download-box .btn-primary,
.download-box .cta-button {
    font-size: var(--font-size-lg);
    padding: var(--spacing-lg) var(--spacing-2xl);
}

/* ============================================
   FAQ Section
   ============================================ */
.faq {
    padding: var(--spacing-4xl) 0;
}

.faq h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-3xl);
    text-rendering: optimizeLegibility;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    margin-bottom: var(--spacing-md);
    border-radius: var(--spacing-sm);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.faq-item h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.faq-item p {
    color: var(--text-light);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    padding: var(--spacing-4xl) 0;
    background: var(--gradient);
    color: var(--white);
    text-align: center;
}

.cta-section h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: var(--letter-spacing-tight);
    text-rendering: optimizeLegibility;
}

.cta-section p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    line-height: var(--line-height-relaxed);
}

.cta-secondary {
    display: inline-block;
    background: var(--white);
    color: var(--primary-color);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--spacing-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    letter-spacing: var(--letter-spacing-wide);
    transition: all var(--transition-base) var(--ease-out);
}

.cta-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    background: var(--primary-50);
    color: var(--primary-dark);
}

/* ============================================
   Footer (Unified Rich Footer)
   ============================================ */
footer {
    background: var(--bg-dark);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    letter-spacing: var(--letter-spacing-wide);
    color: var(--white);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: var(--line-height-relaxed);
    font-size: var(--font-size-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-base) ease;
}

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

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

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    display: inline-block;
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
    margin: 0 var(--spacing-sm);
}

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

/* ============================================
   Newsletter Form
   ============================================ */
.newsletter-form {
    margin-top: var(--spacing-md);
}

.form-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.newsletter-form input[type="email"] {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--spacing-xs);
    color: var(--white);
    font-size: var(--font-size-sm);
    transition: all var(--transition-base) var(--ease-out);
}

.newsletter-form input[type="email"]:focus {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--accent-color);
    outline: none;
}

.newsletter-form input[type="email"]::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.newsletter-form button {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gradient);
    border: none;
    border-radius: var(--spacing-xs);
    color: var(--white);
    font-weight: 600;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-base) var(--ease-out);
    white-space: nowrap;
}

.newsletter-form button:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.form-message {
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-xs);
    min-height: 20px;
}

.form-message.success {
    color: var(--accent-color);
}

.form-message.error {
    color: #ef4444;
}

.newsletter-form.loading button {
    opacity: 0.7;
    cursor: not-allowed;
}

/* ============================================
   Scroll to Top Button
   ============================================ */
.scroll-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    background: var(--gradient);
    border: none;
    border-radius: 50%;
    color: var(--white);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base) var(--ease-out);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.scroll-to-top:hover {
    transform: translateY(0) scale(1.1);
    box-shadow: var(--shadow-xl);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   Fade-in Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow) var(--ease-out),
                transform var(--transition-slow) var(--ease-out);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-stagger {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow) var(--ease-out),
                transform var(--transition-slow) var(--ease-out);
}

.fade-in-stagger.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays */
.fade-in-stagger:nth-child(1) { transition-delay: 0ms; }
.fade-in-stagger:nth-child(2) { transition-delay: 100ms; }
.fade-in-stagger:nth-child(3) { transition-delay: 200ms; }
.fade-in-stagger:nth-child(4) { transition-delay: 300ms; }

/* ============================================
   Responsive Styles
   ============================================ */
@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-4xl) 0 var(--spacing-3xl);
        min-height: auto;
    }

    .hero-content {
        padding: 0 var(--spacing-md);
    }

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

    .screenshot-gallery {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .form-group {
        flex-direction: column;
    }

    .newsletter-form button {
        width: 100%;
    }
}