:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --primary: #2563eb;
  --dark: #0f172a;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container {
  width: min(1100px, 90vw);
  margin: 0 auto;
  padding: 1.5rem 0;
}
.site-header {
  background: #0f172a;
  color: white;
  padding: 1rem 0;
}
.site-header h1,
.site-header p {
  margin: 0;
}
.site-header p {
  margin-top: 0.25rem;
  opacity: 0.8;
}
.nav {
  display: flex;
  gap: 1rem;
  margin-top: 0.75rem;
}
.nav a {
  color: #cbd5e1;
  text-decoration: none;
  font-weight: 600;
}
.nav a.active,
.nav a:hover {
  color: white;
}
.hero {
  background: url('https://images.unsplash.com/photo-1521737604893-d14cc237f11d?auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
  color: white;
  padding: 3rem;
  border-radius: 0.75rem;
  text-shadow: 0 0 25px rgba(0, 0, 0, 0.5);
}
.hero h2 {
  margin: 0;
  font-size: clamp(1.35rem, 5vw, 2.2rem);
}
.section {
  margin-top: 1.25rem;
}
.card {
  background: var(--card);
  border-radius: 0.7rem;
  box-shadow: 0 2px 20px rgba(15, 23, 42, 0.08);
  padding: 1.35rem;
}
.btn {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.65rem 1rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  text-decoration: none;
  font-weight: 700;
}
.skills-grid,
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.6rem;
}
.skills-grid > div,
.contact-grid > div {
  background: #eef2ff;
  border-radius: 0.55rem;
  padding: 0.65rem;
  color: #1e293b;
  font-weight: 600;
}
.site-footer {
  text-align: center;
  color: var(--muted);
  padding: 1rem 0 2rem;
}
.contact-form {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}
.contact-form label {
  color: var(--dark);
  font-weight: 600;
}
.contact-form input,
.contact-form textarea {
  margin-top: 0.4rem;
  width: 100%;
  padding: 0.6rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.45rem;
}
@media (max-width: 768px) {
  .nav {
    flex-wrap: wrap;
  }
  .hero {
    padding: 2rem;
  }
}