:root {
  --color-primary: #00bdb4;
  --color-primary-light: #4dd1cb;
  --color-primary-dark: #007069;
  --color-secondary: #ff8267;
  --color-accent: #ffca3e;
  --color-background: #fafbfc;
  --color-surface: #ffffff;
  --color-text: #1f2733;
  --color-text-secondary: #7a828d;
  --color-border: #dfe2e6;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.18);

  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;

  --transition-fast: 200ms cubic-bezier(0.2, 0, 0, 1);
  --transition-normal: 300ms cubic-bezier(0.2, 0, 0, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(250, 251, 252, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  height: 64px;
  display: flex;
  align-items: center;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: 18px;
  color: var(--color-text);
}

.logo img {
  width: 40px;
  height: 40px;
}

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

.nav a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 14px;
}

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

.lang-switcher {
  display: flex;
  gap: var(--spacing-sm);
}

.lang-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.hero {
  padding: 120px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-background) 0%, #e0f7f6 100%);
}

.hero-icon {
  width: 96px;
  height: 96px;
  margin: 0 auto var(--spacing-lg);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
}

.hero-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-text);
  border-radius: var(--radius-lg);
  color: white;
  font-weight: 500;
  transition: transform var(--transition-fast),
    box-shadow var(--transition-fast);
  box-shadow: var(--shadow-md);
}

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

.store-badge svg {
  width: 24px;
  height: 24px;
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text);
}

.gallery {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 0 var(--spacing-md);
  margin: 0 calc(-1 * var(--spacing-md));
}

.gallery::-webkit-scrollbar {
  display: none;
}

.gallery-track {
  display: flex;
  gap: var(--spacing-lg);
  padding: 0 var(--spacing-md);
  min-width: max-content;
}

.gallery-item {
  flex-shrink: 0;
  width: 280px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-normal);
}

.gallery-item:hover {
  transform: scale(1.02);
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
}

.features {
  background-color: white;
}

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

.feature-card {
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  padding: var(--spacing-md);
  background-color: #e0f7f6;
  border-radius: var(--radius-full);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  display: block;
  margin: 0 auto;
}

.feature-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.feature-description {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.use-cases {
  background-color: var(--color-background);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.use-case-card {
  background-color: white;
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast);
}

.use-case-card:hover {
  box-shadow: var(--shadow-md);
}

.use-case-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.use-case-description {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer {
  background-color: var(--color-text);
  color: white;
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
}

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

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

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-contact {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
}

.placeholder {
  text-align: center;
  padding: 120px 20px;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.placeholder-icon {
  width: 80px;
  height: 80px;
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.placeholder-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.placeholder-text {
  font-size: 16px;
  color: var(--color-text-secondary);
}

@media (min-width: 768px) {
  .hero {
    padding: 160px 0 100px;
  }

  .hero-icon {
    width: 128px;
    height: 128px;
  }

  .hero-title {
    font-size: 48px;
  }

  .hero-subtitle {
    font-size: 20px;
  }

  .gallery {
    overflow: visible;
    padding: 0;
    margin: 0;
  }

  .gallery-track {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    min-width: 0;
  }

  .gallery-item {
    width: 100%;
  }

  .features-grid,
  .use-cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid,
  .use-cases-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 767px) {
  .header-content {
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
  }

  .header {
    height: auto;
    min-height: 64px;
  }

  .nav {
    gap: var(--spacing-md);
  }

  .hero-title {
    font-size: 24px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .store-badge {
    width: 100%;
    justify-content: center;
  }

  .footer-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}