/* CSS Custom Properties */
:root {
  --color-primary: #139900;
  --color-primary-dark: #0f7300;
  --color-secondary: #5c67f2;
  --color-accent-blue: #5c67f2;
  --color-accent-green: #139900;
  --color-accent-orange: #fd7e14;
  --color-accent-teal: #20c997;
  --color-accent-indigo: #6f42c1;
  
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  
  --color-bg: #ffffff;
  --color-bg-light: #f7f8fc;
  --color-bg-dark: #1a1a1a;
  
  --color-border: #eeeeee;
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  --container-max-width: 1200px;
  --container-padding: 1.5rem;
  
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-full: 9999px;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

h3 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
}

p {
  margin-bottom: var(--spacing-sm);
}

.lead {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-light);
}

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

/* Header & Navigation */
.site-header {
  background-color: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background-color: rgba(247, 248, 252, 0.95);
}

.navbar {
  padding: var(--spacing-sm) 0;
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  text-decoration: none;
  color: var(--color-text);
  font-size: 1.5rem;
  font-weight: 600;
  transition: color var(--transition-base);
}

.navbar-brand:hover {
  color: var(--color-primary);
}

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

.app-icon {
  width: 40px;
  height: 40px;
  display: inline-block;
  object-fit: contain;
  border-radius: var(--border-radius-sm);
}

.brand-text {
  font-weight: 600;
}

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

.nav-link {
  color: var(--color-text-light);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-base);
  position: relative;
}

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

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

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  padding: var(--spacing-2xl) 0;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

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

@media (min-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr 1fr;
  }
}

.hero-text h1 {
  color: white;
  margin-bottom: var(--spacing-md);
}

.hero-text .lead {
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: var(--spacing-lg);
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.app-screenshot {
  width: 100%;
  max-width: 350px;
  height: auto;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.app-screenshot-placeholder {
  width: 100%;
  max-width: 350px;
  aspect-ratio: 9 / 19.5;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Section Dividers */
.section-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg) 0;
  margin: var(--spacing-xl) 0;
}

.section-divider::before,
.section-divider::after {
  content: '';
  flex: 1;
  height: 3px;
  max-width: 200px;
  background: linear-gradient(90deg, transparent, currentColor, transparent);
  margin: 0 var(--spacing-md);
}

.section-divider.purple {
  color: var(--color-primary);
}

.section-divider.green {
  color: var(--color-primary);
}

.section-divider.blue {
  color: var(--color-accent-blue);
}

.section-divider-icon {
  background: var(--color-bg);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-md);
  color: inherit;
}

/* Features Section */
.features-section {
  padding: var(--spacing-2xl) 0;
}

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

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

.feature-card {
  padding: var(--spacing-md);
}

.feature-card h3 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.25rem;
}

.feature-card p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Feature Dividers */
.feature-divider {
  width: 120px;
  height: 2px;
  margin-bottom: var(--spacing-sm);
  border-radius: 2px;
}

.feature-divider.purple {
  background: linear-gradient(90deg, var(--color-primary), transparent);
}

.feature-divider.blue {
  background: linear-gradient(90deg, var(--color-accent-blue), transparent);
}

.feature-divider.green {
  background: linear-gradient(90deg, var(--color-accent-green), transparent);
}

.feature-divider.orange {
  background: linear-gradient(90deg, var(--color-accent-orange), transparent);
}

.feature-divider.teal {
  background: linear-gradient(90deg, var(--color-accent-teal), transparent);
}

.feature-divider.indigo {
  background: linear-gradient(90deg, var(--color-accent-indigo), transparent);
}

/* Benefits Section */
.benefits-section {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-bg-light);
}

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

@media (min-width: 768px) {
  .benefits-grid {
    grid-template-columns: 1fr 1fr;
  }
}

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

.benefit-item h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
}

.benefit-item p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Download Section */
.download-section {
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.download-section .lead {
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* App Store Button */
.app-store-button {
  display: inline-block;
  margin-top: var(--spacing-sm);
  transition: transform var(--transition-base);
}

.app-store-button:hover {
  transform: scale(1.05);
}

.app-store-button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
  border-radius: var(--border-radius-sm);
}

.app-store-button img {
  height: 60px;
  width: auto;
  border-radius: var(--border-radius-sm);
  display: block;
}

/* Footer */
.site-footer {
  background-color: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-column h3 {
  color: white;
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.footer-column p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
}

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

.footer-link:hover {
  color: white;
}

.footer-link:focus-visible {
  outline: 2px solid white;
  outline-offset: 4px;
  border-radius: var(--border-radius-sm);
}

.footer-copyright {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
  margin-bottom: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    gap: var(--spacing-sm);
  }
  
  .nav-link {
    font-size: 0.9rem;
  }
  
  .hero-section {
    min-height: auto;
    padding: var(--spacing-xl) 0;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* Reduced Motion */
@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 {
  .site-header,
  .site-footer,
  .section-divider,
  .app-store-button {
    display: none;
  }
  
  body {
    color: black;
    background: white;
  }
}