/**
 * Real Estate Automation - Landing Page Styles
 * Organized CSS with variables, components, and responsive design
 */

/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  /* Colors */
  --primary-gradient-start: #667eea;
  --primary-gradient-end: #764ba2;
  --secondary-gradient-start: #f093fb;
  --secondary-gradient-end: #f5576c;
  --text-dark: #1a202c;
  --text-light: #4a5568;
  --text-muted: #718096;
  --bg-white: #ffffff;
  --bg-light: #f7fafc;
  --bg-gray: #e2e8f0;
  --success: #48bb78;
  --error: #c53030;
  --warning: #ed8936;
  --info: #4299e1;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 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: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  
  /* 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);
  --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, 0.25);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

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

html {
  scroll-behavior: smooth;
}

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

/* ============================================
   Layout Components
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.section-subtitle {
  font-size: var(--font-size-xl);
  text-align: center;
  color: var(--text-muted);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   Header & Navigation
   ============================================ */
header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

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

.logo {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  background: linear-gradient(135deg, var(--primary-gradient-start) 0%, var(--primary-gradient-end) 100%);
  color: white;
  padding: var(--spacing-2xl) 0;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  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") repeat;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 var(--spacing-md);
}

.hero-icon {
  width: 100px;
  height: 100px;
  margin: 0 auto var(--spacing-lg);
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-xl);
}

.hero h1 {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.hero p {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xl);
  opacity: 0.95;
  line-height: 1.6;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  text-align: center;
}

.btn-primary {
  background: white;
  color: var(--primary-gradient-start);
  box-shadow: var(--shadow-lg);
}

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

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  color: white;
  box-shadow: var(--shadow-lg);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* ============================================
   Features Section
   ============================================ */
.features {
  background: var(--bg-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

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

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

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

.feature-card p {
  color: var(--text-light);
  line-height: 1.6;
}

/* ============================================
   How It Works Section
   ============================================ */
.how-it-works {
  background: white;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--bg-light);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

.step:hover {
  background: white;
  box-shadow: var(--shadow-md);
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.step-content h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
  color: var(--text-dark);
}

.step-content p {
  color: var(--text-light);
  line-height: 1.6;
}

/* ============================================
   Benefits Section
   ============================================ */
.benefits {
  background: linear-gradient(135deg, var(--bg-light) 0%, white 100%);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.benefit-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
}

.benefit-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  color: var(--success);
  font-size: 1.5rem;
}

.benefit-item p {
  color: var(--text-light);
  line-height: 1.6;
}

/* ============================================
   Download Section
   ============================================ */
.download {
  background: linear-gradient(135deg, var(--primary-gradient-start) 0%, var(--primary-gradient-end) 100%);
  color: white;
  text-align: center;
}

.download-content {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl);
  margin: var(--spacing-xl) auto;
  max-width: 600px;
  box-shadow: var(--shadow-xl);
}

.download-content .section-title {
  color: white;
  margin-bottom: var(--spacing-md);
}

.download-content .section-subtitle {
  color: rgba(255, 255, 255, 0.9);
}

.version-info {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-md);
}

.version-number {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: white;
  margin-top: var(--spacing-xs);
}

.file-info {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  margin-top: var(--spacing-sm);
}

.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
  margin-right: var(--spacing-sm);
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.error {
  background: rgba(197, 48, 48, 0.2);
  color: white;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
  font-size: var(--font-size-sm);
}

.info {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
  font-size: var(--font-size-sm);
}

/* ============================================
   Release Notes
   ============================================ */
.release-notes {
  text-align: left;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.release-notes h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  color: white;
}

.release-notes-content {
  background: rgba(255, 255, 255, 0.1);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
  white-space: pre-wrap;
  max-height: 300px;
  overflow-y: auto;
}

/* ============================================
   Footer
   ============================================ */
footer {
  background: var(--text-dark);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.footer-copyright {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-size-sm);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  .hero h1 {
    font-size: var(--font-size-3xl);
  }
  
  .hero p {
    font-size: var(--font-size-lg);
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  .section-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  
  .steps {
    gap: var(--spacing-md);
  }
  
  .step {
    flex-direction: column;
    text-align: center;
  }
  
  .download-content {
    padding: var(--spacing-lg);
  }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
  }
}

@media (max-width: 480px) {
  .hero {
    min-height: 60vh;
    padding: var(--spacing-xl) 0;
  }
  
  .hero-icon {
    width: 80px;
    height: 80px;
    font-size: 2.5rem;
  }
  
  .hero h1 {
    font-size: var(--font-size-2xl);
  }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
}