:root {
  --bg: #0a0e14;
  --bg-alt: #10161f;
  --border: #1f2937;
  --text: #e6edf3;
  --text-dim: #8b98a5;
  --accent: #4dd6c4;
  --accent-dim: #2d7d72;
  --radius: 10px;
  --max-width: 960px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

header {
  position: sticky;
  top: 0;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.logo {
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
}

nav {
  display: flex;
  gap: 24px;
}

nav a {
  color: var(--text-dim);
  font-size: 0.95rem;
}

nav a:hover {
  color: var(--text);
  text-decoration: none;
}

.hero {
  padding-top: 96px;
  padding-bottom: 64px;
}

.hero .eyebrow {
  color: var(--accent);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  margin: 0 0 8px;
  line-height: 1.15;
}

.hero h1 .surname2 {
  color: var(--text-dim);
  font-weight: 500;
}

.hero .role {
  font-size: 1.2rem;
  color: var(--text-dim);
  margin: 0 0 24px;
}

.hero p.bio {
  max-width: 640px;
  color: var(--text-dim);
  font-size: 1.05rem;
}

.links {
  display: flex;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.95rem;
}

.btn:hover {
  border-color: var(--accent-dim);
  background: var(--bg-alt);
  text-decoration: none;
}

.btn.primary {
  background: var(--accent);
  color: #062420;
  border-color: var(--accent);
  font-weight: 600;
}

.btn.primary:hover {
  background: #63e0cf;
}

section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.hero {
  border-top: none;
}

section h2 {
  font-size: 1.6rem;
  margin: 0 0 32px;
}

.certs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card h3 {
  margin: 0;
  font-size: 1.15rem;
}

.card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
  flex-grow: 1;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 0.75rem;
  color: var(--accent);
  background: rgba(77, 214, 196, 0.1);
  border: 1px solid var(--accent-dim);
  border-radius: 999px;
  padding: 3px 10px;
}

.card .card-link {
  margin-top: 4px;
  font-size: 0.9rem;
  font-weight: 500;
}

.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.skills h3 {
  font-size: 1rem;
  color: var(--text-dim);
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.skills ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skills li {
  font-size: 0.85rem;
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
}

footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  color: var(--text-dim);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

footer a {
  color: var(--text-dim);
}

@media (max-width: 560px) {
  nav {
    gap: 14px;
  }
  nav a {
    font-size: 0.85rem;
  }
  .hero {
    padding-top: 64px;
    padding-bottom: 48px;
  }
  section {
    padding: 56px 0;
  }
}