:root {
  --pink-50: #fdf2f8;
  --pink-100: #fce7f3;
  --pink-200: #fbcfe8;
  --pink-300: #f9a8d4;
  --pink-400: #f472b6;
  --pink-500: #ec4899;
  --pink-600: #db2777;
  --pink-700: #be185d;
  --pink-800: #9d174d;
  --pink-900: #831843;
  --pink-glow: rgba(236, 72, 153, 0.4);
  --bg-overlay: rgba(253, 242, 248, 0.85);
  --text-dark: #1f2937;
  --text-muted: #6b7280;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-dark);
  min-height: 100vh;
  overflow-x: hidden;
}

#webgl-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 2rem;
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(236, 72, 153, 0.15);
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--pink-600);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.lang-wrap {
  position: relative;
}

.lang-current {
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dark);
  background: transparent;
  border: 1px solid rgba(236, 72, 153, 0.3);
  border-radius: 0.5rem;
  cursor: pointer;
  font-family: inherit;
}

.lang-current:hover {
  border-color: var(--pink-500);
  color: var(--pink-600);
}

.lang-list {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.25rem;
  padding: 0.25rem 0;
  list-style: none;
  background: var(--bg-overlay);
  border: 1px solid rgba(236, 72, 153, 0.15);
  border-radius: 0.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  min-width: 10rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
}

.lang-wrap.open .lang-list {
  opacity: 1;
  visibility: visible;
}

.lang-list button {
  display: block;
  width: 100%;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  color: var(--text-dark);
}

.lang-list button:hover {
  background: rgba(236, 72, 153, 0.1);
  color: var(--pink-600);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--pink-600);
}

main {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 4rem;
}

.hero-title {
  font-size: clamp(3rem, 10vw, 5rem);
  font-weight: 700;
  color: var(--pink-600);
  letter-spacing: -0.03em;
  text-shadow: 0 0 40px var(--pink-glow);
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  color: var(--text-dark);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  border-radius: 9999px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
  color: white;
  box-shadow: 0 4px 20px var(--pink-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--pink-glow);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  color: var(--text-dark);
  text-align: center;
  margin-bottom: 2.5rem;
}

.features {
  padding: 5rem 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  border-radius: 1rem;
  padding: 1.75rem;
  border: 1px solid rgba(236, 72, 153, 0.12);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(236, 72, 153, 0.15);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-size: 1.125rem;
  color: var(--pink-700);
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.download {
  padding: 4rem 0;
  text-align: center;
}

.download-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  border-radius: 1rem;
  font-weight: 600;
  text-decoration: none;
  color: white;
  transition: transform 0.2s, box-shadow 0.2s;
  min-width: 160px;
  justify-content: center;
}

.download-btn.android {
  background: linear-gradient(135deg, #3ddc84, #2e7d32);
  box-shadow: 0 4px 20px rgba(61, 220, 132, 0.35);
}

.download-btn.ios {
  background: linear-gradient(135deg, #007aff, #5856d6);
  box-shadow: 0 4px 20px rgba(0, 122, 255, 0.35);
}

.download-btn:hover {
  transform: translateY(-3px);
}

.download-btn.android:hover {
  box-shadow: 0 8px 30px rgba(61, 220, 132, 0.45);
}

.download-btn.ios:hover {
  box-shadow: 0 8px 30px rgba(0, 122, 255, 0.45);
}

.download-icon {
  font-size: 1.5rem;
}

.download-note {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.contact {
  padding: 4rem 0;
}

.contact-info {
  text-align: center;
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  border-radius: 1rem;
  padding: 2rem;
  max-width: 400px;
  margin: 0 auto;
  border: 1px solid rgba(236, 72, 153, 0.12);
}

.contact-info p {
  margin-bottom: 0;
  color: var(--text-dark);
}

.contact-info .contact-email {
  color: var(--pink-600);
  text-decoration: none;
  font-weight: 500;
}

.contact-info .contact-email:hover {
  text-decoration: underline;
}

.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  border-top: 1px solid rgba(236, 72, 153, 0.12);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
}

.footer-links a {
  color: var(--pink-600);
  text-decoration: none;
  font-weight: 500;
}

.footer-links a:hover {
  text-decoration: underline;
}

.copyright {
  font-size: 0.875rem;
  color: var(--text-muted);
}

@media (max-width: 640px) {
  .nav-links {
    gap: 1rem;
  }
  .header {
    padding: 0.75rem 1rem;
  }
  main {
    padding: 0 1rem 3rem;
  }
}