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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #111;
  background: #fff;
}

header {
  background: #000;
  color: #fff;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

header .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.container {
  width: 92%;
  max-width: 860px;
  margin: 0 auto;
}

.brand {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  flex: 1 1 auto;
}

.brand a {
  color: #fff;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: flex-start;
}

.nav a {
  color: #bbb;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.nav a:hover,
.nav a.active {
  color: #fff;
}

main {
  padding: 2.5rem 0;
  min-height: calc(100vh - 180px);
}

.hero {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 6vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1rem;
  color: #555;
  max-width: 560px;
  margin: 0 auto;
}

.card {
  background: #fff;
  border: 1px solid #e5e5e5;
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 1rem;
  margin-top: 1.75rem;
}

h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  margin-top: 1.5rem;
}

p {
  margin-bottom: 1rem;
  color: #333;
}

ul {
  margin-left: 1.25rem;
  margin-bottom: 1rem;
  color: #333;
}

li {
  margin-bottom: 0.5rem;
}

a {
  color: #000;
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  text-decoration: none;
}

.contact-link {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

footer {
  background: #000;
  color: #aaa;
  padding: 1.75rem 0;
  text-align: center;
  font-size: 0.85rem;
}

footer a {
  color: #fff;
  text-decoration: none;
  margin: 0 0.4rem;
}

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

@media (min-width: 640px) {
  header {
    padding: 1.25rem 0;
  }

  .brand {
    font-size: 1.5rem;
  }

  .nav {
    gap: 1.5rem;
    justify-content: flex-end;
  }

  .nav a {
    font-size: 0.95rem;
  }

  main {
    padding: 3rem 0;
  }

  .hero {
    margin-bottom: 3rem;
  }

  .hero h1 {
    font-size: 3rem;
  }

  .hero p {
    font-size: 1.125rem;
  }

  .card {
    padding: 2rem;
    margin-bottom: 1.5rem;
  }

  h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
  }

  h3 {
    font-size: 1.125rem;
  }

  .contact-link {
    font-size: 1.125rem;
  }

  footer {
    padding: 2rem 0;
    font-size: 0.9rem;
  }
}