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

:root {
  --bg: #0f0f0f;
  --card: #171717;
  --border: #2a2a2a;
  --text: #f5f5f5;
  --muted: #9a9a9a;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.container {
  width: min(1100px, 90%);
  margin: auto;
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  text-align: center;
}

.logo h1 {
  font-size: 3rem;
  letter-spacing: 10px;
  margin-top: 10px;
}

.logo span {
  color: var(--muted);
  display: block;
  margin-top: 10px;
}

.hero-content {
  margin-top: 50px;
}

.hero-content h2 {
  font-size: 2.5rem;
  max-width: 800px;
  margin: auto;
}

.hero-content p {
  max-width: 700px;
  margin: 25px auto;
  color: var(--muted);
}

.btn {
  display: inline-block;
  padding: 14px 28px;
  border: 1px solid #fff;
  color: #fff;
  text-decoration: none;
  transition: 0.3s;
}

.btn:hover .about,
.products,
.materials,
.contact {
  padding: 100px 0;
}

h3 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 30px;
}

.about p {
  max-width: 700px;
  margin: 0 auto 25px;
  text-align: center;
  color: var(--muted);
}

.contact p {
  max-width: 700px;
  margin: 0 auto 25px;
  text-align: center;
  color: var(--muted);
}

.contact .container {
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 30px;
}

.card h4 {
  margin-bottom: 15px;
}

.card p {
  color: var(--muted);
}

.material-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
}

.material-list span {
  border: 1px solid var(--border);
  padding: 12px 20px;
}

footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 30px;
  color: var(--muted);
}

@media (max-width: 768px) {
  .logo h1 {
    font-size: 2rem;
    letter-spacing: 5px;
  }

  .hero-content h2 {
    font-size: 1.8rem;
  }
}