:root {
  --accent: #007aff;
  --amoled-black: #000000;
  --text-primary: #ffffff;
  --text-secondary: #8E8E93;
  --text-tertiary: #636366;
  --ios-padding: 16px;
  --container-max-width: 680px;
  --card-background: rgba(255, 255, 255, 0.05);
  --card-background-hover: rgba(255, 255, 255, 0.08);
  --card-background-active: rgba(255, 255, 255, 0.12);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--amoled-black);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  will-change: transform;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  opacity: 80%;
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--ios-padding);
  display: flex;
  flex-direction: column;
  gap: 32px;
  min-height: 100vh;
  padding-bottom: env(safe-area-inset-bottom);
  transform: translateZ(0);
  backface-visibility: hidden;
  perspective: 1000;
}

.logo-section {
  text-align: center;
  padding: 48px 0;
  animation: fadeIn 0.8s ease-out;
}

.app-logo {
  width: 120px;
  height: 120px;
  margin-bottom: 16px;
  animation: scaleIn 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}

.app-name {
  font-size: 34px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
  background: linear-gradient(to right, #fff, rgba(255, 255, 255, 0.8));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.app-version {
  color: var(--text-secondary);
  font-size: 17px;
  font-weight: 500;
}

.content-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 24px;
  animation: slideUp 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}

.info-group {
  padding: 20px var(--ios-padding);
  background-color: var(--card-background);
  border-radius: 16px;
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  transform: translateZ(0);
  backface-visibility: hidden;
}

.info-group:active {
  transform: scale(0.97);
  transition-duration: 0.1s;
}

.info-group h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}

.info-group p {
  color: var(--text-secondary);
  font-size: 17px;
  font-weight: 400;
  letter-spacing: -0.2px;
}

.features-list {
  list-style: none;
  color: var(--text-secondary);
  margin-top: 8px;
}

.features-list li {
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 17px;
  font-weight: 400;
  display: flex;
  align-items: center;
  gap: 12px;
}

.features-list li svg {
  width: 20px;
  height: 20px;
  opacity: 0.6;
}

.features-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.tag-container {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.tag {
  background: rgba(255, 255, 255, 0.08);
  padding: 6px 12px;
  border-radius: 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.divider {
  height: 1px;
  background-color: rgba(255, 255, 255, 0.1);
  margin: 16px 0;
}

.developer-section {
  text-align: center;
  padding: var(--ios-padding);
}

.developer-name {
  color: var(--text-secondary);
  font-size: 17px;
  margin-bottom: 8px;
  font-weight: 500;
}

.developer-contact {
  color: var(--accent);
  font-size: 15px;
  margin-bottom: 8px;
}

.copyright {
  color: var(--text-tertiary);
  font-size: 13px;
  font-weight: 400;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  
  to {
    opacity: 1;
  }
}

@keyframes scaleIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 12px;
    gap: 24px;
  }
  
  .logo-section {
    padding: 32px 0;
  }
  
  .app-logo {
    width: 100px;
    height: 100px;
  }
  
  .app-name {
    font-size: 28px;
  }
  
  .info-group {
    padding: 16px;
  }
  
  .info-group h2 {
    font-size: 18px;
  }
  
  .features-list li {
    padding: 12px 0;
  }
}