:root {
  --primary: #2563eb;
  --dark: #020617;
  --light: #f9fafb;
  --text: #111827;
  --muted: #6b7280;
}

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

html {
  scroll-behavior: smooth;
}

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

/* Navigation */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(2, 6, 23, 0.9);
  backdrop-filter: blur(6px);
  padding: 16px 0;
  text-align: center;
  z-index: 1000;
}

nav a {
  color: #e5e7eb;
  margin: 0 18px;
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  color: white;
}

/* Hero */
header {
  position: relative;
  height: 100vh;
  background: url("https://source.unsplash.com/1600x900/?technology,software")
              center / cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
  padding: 0 20px;
}

header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(2, 6, 23, 0.7);
}

header > div {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

header h1 {
  font-size: 3rem;
  font-weight: 600;
  letter-spacing: -0.5px;
}

header p {
  margin-top: 20px;
  font-size: 1.3rem;
  color: #e5e7eb;
}

/* Button */
.btn {
  display: inline-block;
  margin-top: 32px;
  padding: 12px 32px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
}

.btn:hover {
  background: #1d4ed8;
}

/* Sections */
section {
  background: var(--light);
  max-width: 1100px;
  margin: 80px auto;
  padding: 64px 72px;
  border-radius: 8px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
}

h2 {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 24px;
}

p {
  margin-bottom: 16px;
}

ul {
  margin-left: 20px;
}

li {
  margin-bottom: 8px;
}

/* Services Grid */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.service-card {
  padding: 32px 28px;
  border-radius: 6px;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.service-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--dark);
}

.service-card p {
  font-size: 0.95rem;
  color: #374151;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.08);
}

/* Footer */
footer {
  text-align: center;
  color: #9ca3af;
  padding: 40px 20px;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 1000px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  section {
    padding: 50px 32px;
    margin: 60px 20px;
  }
}

@media (max-width: 600px) {
  .services-grid {
    grid-template-columns: 1fr;
  }

  header h1 {
    font-size: 2.2rem;
  }

  header p {
    font-size: 1.1rem;
  }
}