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

:root {
  --bg: #0d0d0d;
  --surface: #111;
  --border: #1e1e1e;
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --accent: #a855f7;
  --accent-hover: #c084fc;
  --radius: 12px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.logo-mark {
  color: var(--accent);
  font-size: 1.4rem;
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  width: 100%;
}

.hero {
  padding: 100px 0 80px;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.25);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent), #c084fc, #e879f9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 560px;
  margin: 0 auto 40px;
}

.app-store-wrapper {
  display: inline-flex;
  position: relative;
  align-items: center;
  justify-content: center;
}

.app-store-blur {
  filter: blur(4px);
  pointer-events: none;
  user-select: none;
}

.coming-soon-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 8px 20px;
  border-radius: 100px;
  background: var(--accent);
  color: white;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  z-index: 1;
}

.app-store-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  background: var(--accent);
  color: white;
  text-decoration: none;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  transition: background 0.2s, transform 0.15s;
}

.app-store-button:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

.hero-footnote {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.features {
  padding: 80px 0;
  text-align: center;
}

.features h2,
.topics h2,
.contact h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 48px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: left;
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: var(--accent);
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.topics {
  padding: 80px 0;
  text-align: center;
}

.topic-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  max-width: 720px;
  margin: 0 auto;
}

.topic-card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 10px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color 0.2s;
}

.topic-card:hover {
  border-color: var(--accent);
}

.topic-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.contact {
  padding: 80px 0 120px;
  text-align: center;
}

.contact-form {
  max-width: 440px;
  margin: 32px auto 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s;
  box-sizing: border-box;
}

.contact-form input:-webkit-autofill,
.contact-form textarea:-webkit-autofill {
  -webkit-box-shadow: 0 0 0 100px var(--surface) inset !important;
  -webkit-text-fill-color: var(--text-primary) !important;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--text-tertiary);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
}

.contact-button {
  display: inline-block;
  padding: 14px 32px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.95rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.contact-button:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

footer {
  border-top: 1px solid var(--border);
  padding: 48px 32px 24px;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 48px;
}

.footer-tagline {
  color: var(--text-tertiary);
  font-size: 0.85rem;
  margin-top: 8px;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-secondary);
}

.footer-col a {
  display: block;
  color: var(--text-tertiary);
  text-decoration: none;
  font-size: 0.85rem;
  margin-bottom: 8px;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  max-width: 1200px;
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.8rem;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.25rem;
  }

  .hero {
    padding: 60px 0 48px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .nav-links {
    gap: 16px;
  }

  .footer-content {
    flex-direction: column;
    gap: 32px;
  }
}