/* ============================================================================
   EBOOK OPENCLAW - LANDING PAGE STYLES
   Modern, responsive design inspired by OpenClaw brand
   ============================================================================ */

/* CSS Custom Properties (Variables) */
:root {
  /* Colors */
  --primary: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;
  --secondary: #8b5cf6;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  
  --border-light: #e5e7eb;
  --border-medium: #d1d5db;
  
  --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --gradient-secondary: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* 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), 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);
  
  /* Animation */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Dark mode variables (future enhancement) */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --border-light: #374151;
    --border-medium: #4b5563;
  }
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

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

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

@media (max-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  h3 { font-size: 1.75rem; }
}

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

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

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

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

.btn-pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* Language Selector */
.language-bar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
  padding: var(--spacing-sm) 0;
}

.language-selector {
  display: flex;
  gap: var(--spacing-sm);
}

.lang-btn {
  background: transparent;
  border: 1px solid var(--border-medium);
  border-radius: 0.375rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.lang-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Header */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav {
  display: flex;
  gap: var(--spacing-xl);
}

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

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

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

/* Hero Section */
.hero {
  background: var(--gradient-hero);
  color: white;
  padding: var(--spacing-3xl) 0;
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  position: relative;
}

@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
}

.hero-description {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-xl);
  line-height: 1.6;
}

.hero-features {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 500;
}

.feature .icon {
  font-size: 1.25rem;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-lg);
}

@media (max-width: 968px) {
  .hero-cta {
    align-items: center;
  }
}

.price-info {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-sm);
}

.price {
  display: flex;
  align-items: baseline;
  font-size: 2rem;
  font-weight: 700;
}

.currency {
  font-size: 1.25rem;
}

.price-description {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* Hero Image */
.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
}

.ebook-mockup {
  position: relative;
  max-width: 400px;
  width: 100%;
}

.ebook-cover {
  width: 100%;
  height: auto;
  border-radius: 1rem;
  box-shadow: var(--shadow-xl);
  transform: perspective(1000px) rotateY(-15deg) rotateX(5deg);
  transition: transform var(--transition-slow);
}

.ebook-cover:hover {
  transform: perspective(1000px) rotateY(-10deg) rotateX(2deg) scale(1.05);
}

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

.floating-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(255, 255, 255, 0.95);
  color: var(--text-primary);
  border-radius: 0.5rem;
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  font-weight: 600;
  animation: float 3s ease-in-out infinite;
}

.floating-card:nth-child(1) {
  top: 10%;
  right: -20%;
  animation-delay: 0s;
}

.floating-card:nth-child(2) {
  top: 50%;
  left: -30%;
  animation-delay: 1s;
}

.floating-card:nth-child(3) {
  bottom: 20%;
  right: -15%;
  animation-delay: 2s;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Social Proof */
.social-proof {
  background: var(--bg-secondary);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.social-proof-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.avatars {
  display: flex;
  align-items: center;
  gap: -var(--spacing-xs);
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 3px solid white;
  object-fit: cover;
  margin-left: -8px;
}

.avatar-more {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 600;
  margin-left: var(--spacing-xs);
}

/* Section Styles */
section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Benefits Grid */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.benefit-card {
  background: white;
  padding: var(--spacing-xl);
  border-radius: 1rem;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
}

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

.benefit-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
}

.benefit-card h3 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

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

/* Chapters */
.chapters {
  background: var(--bg-secondary);
}

.chapters-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  max-width: 900px;
  margin: 0 auto;
}

.chapter-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-xl);
  align-items: flex-start;
}

.chapter-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  background: var(--gradient-primary);
  color: white;
  border-radius: 50%;
  font-size: 1.5rem;
  font-weight: 700;
  flex-shrink: 0;
}

.chapter-content h3 {
  margin-bottom: var(--spacing-sm);
}

.chapter-topics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.chapter-topics span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .chapter-item {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

/* Cases */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.case-card {
  background: white;
  padding: var(--spacing-xl);
  border-radius: 1rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
}

.case-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.case-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
}

.case-info h4 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.125rem;
}

.case-info span {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.case-result {
  margin-left: auto;
  text-align: right;
}

.case-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--success);
}

.case-method {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-tertiary);
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
}

/* Pricing */
.pricing {
  background: var(--bg-secondary);
}

.pricing-card {
  max-width: 500px;
  margin: 0 auto;
  background: white;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 2px solid var(--primary);
}

.pricing-header {
  background: var(--gradient-primary);
  color: white;
  padding: var(--spacing-xl);
  text-align: center;
}

.pricing-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
}

.pricing-value {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.currency {
  font-size: 2rem;
}

.price-main {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
}

.price-comparison {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-lg);
}

.price-old {
  text-decoration: line-through;
  opacity: 0.7;
  font-size: 1.125rem;
}

.discount {
  background: var(--warning);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 0.375rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.pricing-features {
  padding: var(--spacing-xl);
}

.pricing-features h4 {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.pricing-features ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
}

.pricing-cta {
  padding: 0 var(--spacing-xl) var(--spacing-xl);
  text-align: center;
}

.pricing-guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.pricing-urgency {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  color: white;
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xl);
}

.urgency-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  text-align: center;
}

.urgency-icon {
  font-size: 1.5rem;
  animation: bounce 1s infinite;
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.faq-item {
  background: white;
  border-radius: 1rem;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.faq-question {
  padding: var(--spacing-lg);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color var(--transition-fast);
}

.faq-question:hover {
  background: var(--bg-secondary);
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--text-secondary);
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* Final CTA */
.final-cta {
  background: var(--gradient-hero);
  color: white;
  text-align: center;
}

.final-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.9;
}

@media (max-width: 768px) {
  .final-stats {
    grid-template-columns: 1fr;
  }
}

/* Footer */
.footer {
  background: var(--text-primary);
  color: white;
  padding: var(--spacing-xl) 0;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
}

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

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  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, 0.2);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
}

@media (max-width: 768px) {
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-lg);
  }
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.95);
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--spacing-lg);
  z-index: 9999;
}

.loading-overlay.active {
  display: flex;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-light);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
  .benefits-grid,
  .cases-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-content {
    gap: var(--spacing-xl);
  }
  
  .hero-features {
    align-items: center;
  }
  
  section {
    padding: var(--spacing-2xl) 0;
  }
}

/* Print Styles */
@media print {
  .language-bar,
  .header,
  .hero,
  .social-proof,
  .pricing,
  .final-cta,
  .footer,
  .loading-overlay {
    display: none !important;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles */
.btn:focus,
.lang-btn:focus,
.faq-question:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
  }
}