:root{
  --bg-1: #0f172a;
  --bg-2: #1e293b;
  --card-bg: #1e293b;
  --card-border: #334155;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --success: #10b981;
  --warning: #f59e0b;
  --glass: rgba(30, 41, 59, 0.8);
  --max-width: 1200px;
  --border-radius: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.light-theme {
  --bg-1: #f8fafc;
  --bg-2: #e2e8f0;
  --card-bg: #ffffff;
  --card-border: #cbd5e1;
  --muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --success: #10b981;
  --warning: #f59e0b;
  --glass: rgba(255, 255, 255, 0.8);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, var(--bg-1) 0%, var(--bg-2) 100%);
  color: var(--text-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.background-decoration {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.floating-element {
  position: absolute;
  opacity: 0.03;
  animation: float 15s infinite ease-in-out;
}

.pen-element {
  width: 120px;
  height: 40px;
  background: linear-gradient(45deg, var(--accent), var(--warning));
  border-radius: 20px;
  top: 10%;
  left: 5%;
  transform: rotate(30deg);
  animation-delay: 0s;
}

.ink-element {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--success) 0%, transparent 70%);
  top: 70%;
  right: 10%;
  animation-delay: 2s;
}

.paper-element {
  width: 60px;
  height: 80px;
  background: linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
  border-radius: 4px;
  bottom: 20%;
  left: 15%;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

.site-bg {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 32px 20px;
  position: relative;
  z-index: 1;
}

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 32px;
  margin-bottom: 40px;
  background: var(--glass);
  backdrop-filter: blur(12px);
  border-radius: var(--border-radius);
  border: 1px solid var(--card-border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
}

.brand {
  display: flex;
  gap: 20px;
  align-items: center;
}

.logo-container {
  position: relative;
}

.logo {
  width: 72px;
  height: 72px;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  transition: var(--transition);
  border: 2px solid var(--card-border);
}

.logo:hover {
  transform: scale(1.05) rotate(5deg);
  box-shadow: 0 12px 36px rgba(59, 130, 246, 0.3);
}

.logo-glow {
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border-radius: 20px;
  background: linear-gradient(45deg, var(--accent), var(--success), var(--warning));
  opacity: 0;
  transition: var(--transition);
  z-index: -1;
  animation: glow-pulse 3s infinite;
}

.logo:hover + .logo-glow {
  opacity: 0.3;
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 0.4; }
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.main-title {
  font-family: 'Playfair Display', serif;
  font-size: 2.25rem;
  font-weight: 700;
  margin: 0;
  background: linear-gradient(135deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.tag {
  margin: 0;
  color: var(--muted);
  font-weight: 300;
  font-size: 1.1rem;
  letter-spacing: 0.5px;
}

.divider {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 1px;
  margin-top: 4px;
}

.theme-toggle-btn {
  background: var(--glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  margin-right: 16px;
  color: var(--accent);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.6s ease;
}

.theme-toggle-btn:hover::before {
  left: 100%;
}

.theme-toggle-btn:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.4);
  border-color: var(--accent);
}

.theme-icon {
  transition: all 0.4s ease;
  position: absolute;
  opacity: 0;
  transform: scale(0.8);
}

.theme-icon.light-icon {
  opacity: 1;
  transform: scale(1);
}

.light-theme .theme-icon.light-icon {
  opacity: 0;
  transform: scale(0.8);
}

.light-theme .theme-icon.dark-icon {
  opacity: 1;
  transform: scale(1);
}

.light-theme .theme-toggle-btn {
  color: var(--accent);
}

.light-theme .theme-toggle-btn:hover {
  color: white;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-actions .btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-radius: 12px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: var(--transition);
  font-size: 0.95rem;
}

.repo-link {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: white;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.repo-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.4);
  border-color: rgba(255, 255, 255, 0.2);
}

main {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 32px;
  margin-bottom: 48px;
}

.card {
  background: var(--glass);
  backdrop-filter: blur(12px);
  padding: 32px;
  border-radius: var(--border-radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--card-border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--success), var(--warning));
  opacity: 0;
  transition: var(--transition);
}

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

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
  border-color: var(--accent);
}

.card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

.card h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0 0 16px 0;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.card p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  font-size: 1.05rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  transition: var(--transition);
}

.light-theme .feature-item {
  background: rgba(0, 0, 0, 0.03);
}

.feature-item:hover {
  background: rgba(59, 130, 246, 0.1);
  transform: translateX(4px);
}

.light-theme .feature-item:hover {
  background: rgba(59, 130, 246, 0.05);
}

.feature-icon {
  font-size: 1.2rem;
}

.feature-item span:last-child {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
}

.app-store-badge {
  margin-top: 24px;
}

.app-store-link {
  display: inline-block;
  text-decoration: none;
  border-radius: 14px;
  overflow: hidden;
  transition: var(--transition);
  background: linear-gradient(135deg, #000000, #1a1a1a);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.app-store-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

.badge-content {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  min-width: 200px;
}

.badge-text {
  display: flex;
  flex-direction: column;
}

.badge-subtitle {
  font-size: 0.75rem;
  color: #a1a1aa;
  font-weight: 400;
  letter-spacing: 0.5px;
}

.badge-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: white;
  letter-spacing: -0.5px;
}

.badge-icon {
  color: #007AFF;
}

.site-footer {
  margin-top: 48px;
  padding: 32px 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.social-links {
  display: flex;
  gap: 16px;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  color: var(--muted);
  transition: var(--transition);
  text-decoration: none;
}

.social-link:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

.copyright {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.5px;
}

@media (max-width: 768px) {
  :root {
    --border-radius: 12px;
  }
  
  .site-header {
    flex-direction: column;
    gap: 24px;
    text-align: center;
    padding: 24px;
  }
  
  .brand {
    flex-direction: column;
    gap: 16px;
  }
  
  .header-actions {
    width: 100%;
    justify-content: center;
  }
  
  .theme-toggle-btn {
    margin-right: 0;
    margin-left: 0;
  }
  
  .main-title {
    font-size: 1.875rem;
  }
  
  main {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .card {
    padding: 24px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .badge-content {
    padding: 12px 20px;
    min-width: 180px;
  }
  
  .site-bg {
    padding: 24px 16px;
  }
  
  .floating-element {
    display: none;
  }
}

@media (max-width: 480px) {
  .logo {
    width: 60px;
    height: 60px;
  }
  
  .main-title {
    font-size: 1.5rem;
  }
  
  .tag {
    font-size: 1rem;
  }
  
  .card h2 {
    font-size: 1.5rem;
  }
  
  .repo-link,
  .app-store-link {
    width: 100%;
    text-align: center;
  }
  
  .badge-content {
    justify-content: center;
  }
  
  .theme-toggle-btn {
    width: 48px;
    height: 48px;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: fadeInUp 0.6s ease-out forwards;
}

.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.2s; }
.card:nth-child(3) { animation-delay: 0.3s; }

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-2);
}

::-webkit-scrollbar-thumb {
  background: var(--card-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

.light-theme ::-webkit-scrollbar-track {
  background: var(--bg-2);
}

.light-theme ::-webkit-scrollbar-thumb {
  background: var(--card-border);
}

.light-theme ::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}