/* ============================================
   NUOVALINGUA LANDING PAGE - STYLES
   Design moderne inspiré d'alephium.org avec le design system de NuovaLingua
   ============================================ */

:root {
  /* Couleurs du design system NuovaLingua */
  --color-primary: #2563EB;
  --color-primary-rgb: 37, 99, 235;
  --color-secondary: #7C3AED;
  --color-tertiary: #F97316;
  --color-success: #16A34A;
  
  /* Backgrounds */
  --color-background: #F7F9FC;
  --color-surface: #FFFFFF;
  --color-surface-subtle: #F1F5F9;
  --color-surface-inverse: #101828;
  
  /* Textes */
  --color-text-primary: #101828;
  --color-text-secondary: #475467;
  --color-text-muted: #667085;
  --color-text-inverse: #F8FAFC;
  
  /* Bordures */
  --color-border-subtle: #E4E7EC;
  --color-border-strong: #D0D5DD;
  
  /* Typographie */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Espacements */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  --space-3xl: 96px;
  
  /* Rayons */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  
  /* Ombres */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08), 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12), 0 8px 16px rgba(0, 0, 0, 0.08);
  
  /* Transitions */
  --transition-fast: all 150ms ease-out;
  --transition-base: all 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text-primary);
  background: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  background: rgba(247, 249, 252, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition-base);
}

.nav-scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--color-border-subtle);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.logo-icon {
  font-size: 28px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition-base);
}

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

.nav-cta {
  background: var(--color-primary);
  color: white;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
}

.nav-cta::after {
  display: none;
}

.nav-cta:hover {
  background: var(--color-primary);
  opacity: 0.9;
  color: white;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px var(--space-lg) var(--space-3xl);
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
  overflow: hidden;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
  animation: float 20s ease-in-out infinite;
}

.orb-1 {
  width: 600px;
  height: 600px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.3), rgba(124, 58, 237, 0.3));
  top: -200px;
  left: -200px;
  animation-delay: 0s;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.3), rgba(249, 115, 22, 0.3));
  bottom: -150px;
  right: -150px;
  animation-delay: 5s;
}

.orb-3 {
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.2), rgba(37, 99, 235, 0.2));
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: 10s;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(30px, -30px) scale(1.1);
  }
  66% {
    transform: translate(-20px, 20px) scale(0.9);
  }
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 8px 16px;
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--space-xl);
}

.badge-icon {
  font-size: 16px;
}

.hero-title {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 20px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-3xl);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition-base);
  border: none;
  cursor: pointer;
  font-family: var(--font-family);
}

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

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

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-strong);
}

.btn-secondary:hover {
  background: var(--color-surface-subtle);
  border-color: var(--color-text-muted);
}

.btn-large {
  padding: 16px 32px;
  font-size: 18px;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--color-border-subtle);
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-muted);
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border-subtle);
}

/* ============================================
   SECTIONS
   ============================================ */

section {
  padding: var(--space-3xl) 0;
  position: relative;
}

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

.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.section-description {
  font-size: 20px;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   FEATURES
   ============================================ */

.features {
  background: var(--color-surface);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.feature-card {
  padding: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  transition: var(--transition-base);
}

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

.feature-icon {
  font-size: 48px;
  margin-bottom: var(--space-md);
  display: block;
}

.feature-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.feature-description {
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

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

.feature-list li {
  padding: var(--space-xs) 0;
  padding-left: 24px;
  position: relative;
  color: var(--color-text-secondary);
  font-size: 15px;
}

.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

/* ============================================
   SCREENSHOTS
   ============================================ */

.screenshots {
  background: var(--color-background);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.screenshot-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-md);
  transition: var(--transition-base);
  position: relative;
  cursor: pointer;
}

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

.screenshot-card:hover .screenshot-overlay {
  opacity: 1;
}

.screenshot-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 9 / 16;
}

.screenshot-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(16, 24, 40, 0.95), rgba(16, 24, 40, 0.7), transparent);
  padding: var(--space-lg);
  opacity: 0;
  transition: var(--transition-base);
  color: white;
}

.screenshot-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: white;
}

.screenshot-description {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
}

.screenshot-placeholder {
  aspect-ratio: 9 / 16;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-surface-subtle), var(--color-surface));
  padding: var(--space-xl);
  text-align: center;
}

.placeholder-text {
  font-size: 48px;
  margin-bottom: var(--space-sm);
}

.placeholder-subtitle {
  font-size: 16px;
  color: var(--color-text-muted);
  font-weight: 500;
}

.screenshots-note {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 14px;
  font-style: italic;
}

.screenshots-note code {
  background: var(--color-surface-subtle);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: 'SF Mono', monospace;
  font-size: 13px;
}

/* ============================================
   DOWNLOAD
   ============================================ */

.download {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  padding: var(--space-3xl) 0;
}

.download-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.download-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  margin-bottom: var(--space-md);
  color: white;
}

.download-description {
  font-size: 20px;
  margin-bottom: var(--space-2xl);
  opacity: 0.9;
}

.download-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

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

.download .btn-primary:hover {
  background: rgba(255, 255, 255, 0.95);
}

.download .btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border-color: rgba(255, 255, 255, 0.2);
}

.download .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
}

.download-note {
  font-size: 14px;
  opacity: 0.8;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--color-surface-inverse);
  color: var(--color-text-inverse);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.footer-description {
  color: rgba(248, 250, 252, 0.7);
  font-size: 15px;
  line-height: 1.6;
}

.footer-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: white;
}

.footer-links {
  display: flex;
  gap: var(--space-2xl);
}

.footer-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-link {
  color: rgba(248, 250, 252, 0.7);
  text-decoration: none;
  font-size: 15px;
  transition: var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(248, 250, 252, 0.6);
  font-size: 14px;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  .nav-links {
    gap: var(--space-md);
  }
  
  .nav-link {
    font-size: 14px;
  }
  
  .nav-cta {
    padding: 8px 16px;
    font-size: 14px;
  }
  
  .hero {
    padding: 100px var(--space-md) var(--space-2xl);
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .stat-divider {
    width: 40px;
    height: 1px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .screenshots-grid {
    grid-template-columns: 1fr;
  }
  
  .screenshot-overlay {
    opacity: 1;
    background: linear-gradient(to top, rgba(16, 24, 40, 0.98), rgba(16, 24, 40, 0.85));
  }
  
  .screenshot-title {
    font-size: 18px;
  }
  
  .screenshot-description {
    font-size: 13px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--space-xl);
  }
  
  .download-buttons {
    flex-direction: column;
  }
  
  .download .btn {
    width: 100%;
    max-width: 300px;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */

[data-aos] {
  opacity: 0;
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

[data-aos].aos-animate {
  opacity: 1;
}

[data-aos="fade-up"] {
  transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
  transform: translateY(0);
}

[data-aos="zoom-in"] {
  transform: scale(0.9);
}

[data-aos="zoom-in"].aos-animate {
  transform: scale(1);
}