/* ========================================
   π314 Landing Page - Matrix Theme
   ======================================== */

:root {
  --bg-dark: #0a0e27;
  --bg-darker: #050810;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --neon-green: #00ff41;
  --neon-cyan: #00e0c6;
  --neon-purple: #b100ff;
  --accent-blue: #6c8cff;
  --glow-intensity: 0.8;
  --font-mono: 'Courier New', 'Menlo', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

html[data-lang="ja"] {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
}

body {
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

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

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 14, 39, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 255, 65, 0.2);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.8rem;
  font-weight: bold;
  background: linear-gradient(135deg, var(--neon-green), var(--neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-family: var(--font-mono);
  letter-spacing: 2px;
  text-shadow: 0 0 10px rgba(0, 255, 65, 0.5);
}

.header-controls {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.lang-toggle {
  background: rgba(0, 255, 65, 0.1);
  border: 1px solid var(--neon-green);
  color: var(--neon-green);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.lang-toggle:hover {
  background: rgba(0, 255, 65, 0.2);
  box-shadow: 0 0 10px rgba(0, 255, 65, 0.5);
}

/* ========================================
   Hero Section with Digital Rain
   ======================================== */

#hero {
  margin-top: 80px;
  position: relative;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(10, 14, 39, 0.9) 0%, rgba(5, 8, 16, 0.95) 100%);
}

#canvas-rain {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 800px;
}

.hero-title {
  font-size: 4rem;
  font-weight: bold;
  font-family: var(--font-mono);
  letter-spacing: 4px;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--neon-green), var(--neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 20px rgba(0, 255, 65, 0.4);
  animation: glitch 3s ease-in-out infinite;
}

.hero-tagline {
  font-size: 1.5rem;
  color: var(--neon-cyan);
  margin-bottom: 2rem;
  font-weight: 300;
  letter-spacing: 2px;
  text-shadow: 0 0 15px rgba(0, 224, 198, 0.5);
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  line-height: 1.8;
  max-width: 600px;
}

.cta-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 0.9rem 2rem;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 2px solid;
  font-family: var(--font-sans);
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background: linear-gradient(135deg, var(--neon-green), var(--neon-cyan));
  color: var(--bg-dark);
  border-color: var(--neon-green);
  box-shadow: 0 0 20px rgba(0, 255, 65, 0.4);
}

.btn-primary:hover {
  box-shadow: 0 0 30px rgba(0, 255, 65, 0.8), 0 0 60px rgba(0, 224, 198, 0.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 15px rgba(0, 224, 198, 0.3);
}

.btn-secondary:hover {
  background: rgba(0, 224, 198, 0.1);
  box-shadow: 0 0 25px rgba(0, 224, 198, 0.6);
  transform: translateY(-2px);
}

/* ========================================
   Features Section
   ======================================== */

#features {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 4rem;
  font-family: var(--font-mono);
  letter-spacing: 2px;
  background: linear-gradient(135deg, var(--neon-green), var(--neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: rgba(0, 255, 65, 0.05);
  border: 1px solid rgba(0, 255, 65, 0.2);
  padding: 2rem;
  border-radius: 8px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon-green), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  background: rgba(0, 255, 65, 0.1);
  border-color: var(--neon-green);
  box-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
  transform: translateY(-5px);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  color: var(--neon-cyan);
}

.feature-title {
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
  font-weight: 600;
  color: var(--neon-green);
}

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

/* ========================================
   Download Section
   ======================================== */

#download {
  padding: 6rem 2rem;
  text-align: center;
  background: linear-gradient(180deg, rgba(5, 8, 16, 0.5) 0%, rgba(10, 14, 39, 0.7) 100%);
}

.download-container {
  max-width: 600px;
  margin: 0 auto;
}

.download-title {
  font-size: 2.2rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  letter-spacing: 2px;
  color: var(--neon-green);
}

.download-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

.store-buttons {
  display: flex;
  gap: 1.5rem;
  flex-direction: column;
  justify-content: center;
}

.store-btn {
  padding: 1rem 2rem;
  border: 2px solid var(--neon-cyan);
  background: transparent;
  color: var(--neon-cyan);
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.store-btn:hover {
  background: rgba(0, 224, 198, 0.1);
  box-shadow: 0 0 20px rgba(0, 224, 198, 0.5);
  transform: translateX(5px);
}

.store-btn.coming-soon {
  opacity: 0.6;
  cursor: not-allowed;
  border-color: var(--text-secondary);
  color: var(--text-secondary);
}

.store-btn.coming-soon:hover {
  background: transparent;
  box-shadow: none;
  transform: none;
}

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

footer {
  background: rgba(5, 8, 16, 0.9);
  border-top: 1px solid rgba(0, 255, 65, 0.2);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: 2rem;
  align-items: center;
  flex-wrap: wrap;
}

.footer-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-link {
  color: var(--neon-cyan);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-link:hover {
  color: var(--neon-green);
  text-shadow: 0 0 10px rgba(0, 255, 65, 0.5);
}

/* ========================================
   Privacy Policy Page
   ======================================== */

.privacy-container {
  max-width: 900px;
  margin: 100px auto 0;
  padding: 3rem 2rem;
}

.privacy-header {
  margin-bottom: 3rem;
}

.privacy-title {
  font-size: 2.5rem;
  font-family: var(--font-mono);
  color: var(--neon-green);
  margin-bottom: 1rem;
}

.privacy-content {
  line-height: 1.9;
  color: var(--text-secondary);
}

.privacy-content h2 {
  font-size: 1.5rem;
  color: var(--neon-cyan);
  margin: 2rem 0 1rem;
  font-weight: 600;
}

.privacy-content h3 {
  font-size: 1.2rem;
  color: var(--neon-green);
  margin: 1.5rem 0 0.8rem;
  font-weight: 500;
}

.privacy-content ul {
  margin-left: 2rem;
  margin-bottom: 1rem;
}

.privacy-content li {
  margin-bottom: 0.5rem;
}

.privacy-content a {
  color: var(--accent-blue);
  text-decoration: none;
}

.privacy-content a:hover {
  text-decoration: underline;
}

.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--neon-cyan);
  text-decoration: none;
  transition: all 0.3s ease;
}

.back-link:hover {
  color: var(--neon-green);
  transform: translateX(-5px);
}

/* ========================================
   Animations
   ======================================== */

@keyframes glitch {
  0%, 100% {
    text-shadow:
      3px 0 0 var(--neon-green),
      -3px 0 0 var(--neon-cyan);
  }
  50% {
    text-shadow:
      -3px 0 0 var(--neon-green),
      3px 0 0 var(--neon-cyan);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

@keyframes pulse-glow {
  0%, 100% {
    filter: drop-shadow(0 0 10px rgba(0, 255, 65, 0.4));
  }
  50% {
    filter: drop-shadow(0 0 20px rgba(0, 255, 65, 0.8));
  }
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
    letter-spacing: 2px;
  }

  .hero-tagline {
    font-size: 1.1rem;
    letter-spacing: 1px;
  }

  .hero-description {
    font-size: 1rem;
  }

  .cta-buttons {
    flex-direction: column;
    gap: 1rem;
  }

  .btn {
    width: 100%;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .feature-card {
    padding: 1.5rem;
  }

  .store-buttons {
    flex-direction: column;
  }

  header {
    padding: 0.8rem 1rem;
  }

  .logo {
    font-size: 1.3rem;
  }

  .header-controls {
    gap: 1rem;
  }

  .lang-toggle {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
  }

  .privacy-container {
    padding: 2rem 1rem;
    margin-top: 80px;
  }
}

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