:root { --max-width: 1100px; }

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #e5e7eb;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

header {
  border-bottom: 1px solid #1f2937;
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}
header h1 {
  margin: 0;
  font-size: 20px;
}
nav {
  display: flex;
  gap: 20px;
}
nav a {
  text-decoration: none;
  color: #9ca3af;
  font-size: 14px;
}
nav a:hover {
  color: white;
}
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}
.hamburger span {
  width: 25px;
  height: 3px;
  background: white;
  display: block;
}
.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 15px;
  padding: 20px 0;
}
.mobile-nav a {
  color: #9ca3af;
  text-decoration: none;
}

.hero {
  padding: 80px 0;
  text-align: center;
}
.hero h2 {
  font-size: 42px;
  line-height: 1.2;
  margin: 0;
}

.section {
  padding: 60px 0;
}
.section h3 {
  margin-bottom: 30px;
  font-size: 28px;
  text-align: center;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}
.card {
  background: #111827;
  padding: 20px;
  border-radius: 10px;
  border: 1px solid #1f2937;
}
#tech .card,
.section:nth-of-type(4) .card {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.footer {
  text-align: center;
  padding: 40px 20px;
  border-top: 1px solid #1f2937;
  color: #6b7280;
}

@media (max-width: 768px) {
  nav { display: none; }
  .hamburger { display: flex; }
  .mobile-nav.active { display: flex; }
  .section h3 { font-size: 24px; }
  .hero h2 { font-size: 32px; }
}

@media (min-width: 1200px) {
  .section { padding: 80px 0; }
  .section h3 { font-size: 32px; }
  .card { padding: 30px; }
  .hero h2 { font-size: 52px; }
}