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

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

:root {
    /* Color Palette - Modern & Professional */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #ec4899;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 0.75rem;
    --border-radius-lg: 1rem;
    --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);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

/* ============================================
   Accessibility
   ============================================ */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

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

/* Focus styles for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

strong {
    font-weight: 600;
    color: var(--text-primary);
}

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

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

/* ============================================
   Container & Layout
   ============================================ */

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* ============================================
   Header & Navigation
   ============================================ */

.header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-md);
    min-height: 70px;
}

.nav-brand .logo {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 1001;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a {
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-menu .btn-primary {
    color: white !important;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
    border: none;
    padding: var(--spacing-xs) var(--spacing-md);
}

.nav-menu .btn-primary:hover {
    color: white !important;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color)) !important;
}

@media (max-width: 767px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--bg-primary);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-2xl) var(--spacing-lg);
        box-shadow: var(--shadow-xl);
        transition: right var(--transition-base);
        gap: var(--spacing-md);
    }
    
    .nav-menu.active {
        right: 0;
    }
}

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

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

a.btn {
    color: var(--bg-primary);
    border-image: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

/* Secondary button on dark/colored backgrounds */
.hero .btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid white;
    backdrop-filter: blur(10px);
}

.hero .btn-secondary:hover {
    background: white;
    color: var(--primary-color);
    border: 2px solid white;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

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

.hero {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    color: white;
    margin-bottom: var(--spacing-lg);
    font-size: clamp(2rem, 5vw, 3.5rem);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    color: rgba(255, 255, 255, 0.95);
}

.hero-subtitle strong {
    color: white;
    font-weight: 700;
}

.hero-cta-text {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    color: white;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.hero .btn {
    min-width: 200px;
}

.hero .btn:not(.btn-secondary) {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.hero .btn:not(.btn-secondary):hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

/* ============================================
   Sections
   ============================================ */

.section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-2xl);
}

.section-title {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section-intro {
    font-size: clamp(1rem, 2vw, 1.125rem);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

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

.section-outro {
    text-align: center;
    font-size: clamp(1rem, 2vw, 1.125rem);
    font-weight: 500;
    margin-top: var(--spacing-xl);
    color: var(--text-primary);
}

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

/* Text visibility in colored sections */
.cta-section .section-title,
.cta-section .section-intro,
.cta-section .section-outro,
.cta-section p,
.cta-section strong {
    color: white;
}

/* ============================================
   Why Section
   ============================================ */

.why-section {
    background: var(--bg-secondary);
}

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

.feature-card {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    text-align: center;
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    font-weight: bold;
}

.feature-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* ============================================
   How It Works Section
   ============================================ */

.how-section {
    background: var(--bg-primary);
}

.process-flow {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
}

.process-step {
    flex: 1;
    min-width: 200px;
    max-width: 250px;
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
}

.step-number {
    width: 50px;
    height: 50px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
}

.step-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.step-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.process-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: bold;
}

@media (max-width: 767px) {
    .process-flow {
        flex-direction: column;
    }
    
    .process-arrow {
        transform: rotate(90deg);
    }
}

/* ============================================
   Social Proof Section
   ============================================ */

.social-proof-section {
    background: var(--bg-secondary);
}

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

.benefit-item {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.benefit-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.benefit-title {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.benefit-text {
    color: var(--text-secondary);
    margin: 0;
}

/* ============================================
   Who Should Use Section
   ============================================ */

.who-section {
    background: var(--bg-primary);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.audience-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.audience-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.audience-title {
    color: white;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.audience-description {
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

/* ============================================
   Comparison Section
   ============================================ */

.comparison-section {
    background: var(--bg-secondary);
}

.comparison-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: stretch;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.comparison-item {
    flex: 1;
    min-width: 280px;
    max-width: 400px;
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.comparison-item-featured {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-xl);
}

.comparison-item-featured .comparison-title,
.comparison-item-featured .comparison-list,
.comparison-item-featured .comparison-list li {
    color: white;
}

.comparison-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.comparison-list {
    list-style: none;
    padding: 0;
}

.comparison-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
}

.comparison-item .comparison-list li {
    color: var(--text-primary);
}

.comparison-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.5rem;
}

.comparison-item-featured .comparison-list li::before {
    color: white;
}

.comparison-vs {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    align-self: center;
}

@media (max-width: 767px) {
    .comparison-content {
        flex-direction: column;
    }
    
    .comparison-vs {
        transform: rotate(90deg);
    }
}

/* ============================================
   SEO Section
   ============================================ */

.seo-section {
    background: var(--bg-primary);
}

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

.seo-item {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border-top: 4px solid var(--accent-color);
    transition: all var(--transition-base);
}

.seo-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.seo-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.seo-text {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.95rem;
}

/* ============================================
   Trust Section
   ============================================ */

.trust-section {
    background: var(--bg-secondary);
}

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

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

.cta-title {
    color: white;
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-lg);
}

.cta-text {
    font-size: clamp(1rem, 2vw, 1.25rem);
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--spacing-md);
}

.cta-text-strong {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-xl);
}

.cta-buttons {
    margin-top: var(--spacing-xl);
}

.cta-section .btn {
    background: white;
    color: var(--primary-color);
    min-width: 250px;
}

.cta-section .btn:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

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

.footer {
    background: var(--bg-dark);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-title {
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

.footer-heading {
    color: white;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

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

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.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, 0.6);
}

/* ============================================
   Performance Optimizations
   ============================================ */

/* Lazy loading images */
img {
    loading: lazy;
    max-width: 100%;
    height: auto;
}

/* Reduce motion for accessibility */
@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;
    }
}

/* Print styles */
@media print {
    .header,
    .footer,
    .nav,
    .btn {
        display: none;
    }
    
    .section {
        page-break-inside: avoid;
    }
}