:root {
  --navy: #0f2940;
  --blue: #1f6feb;
  --gray: #555;
  --light: #f6f8fa;
  --border: #e1e4e8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #222;
  line-height: 1.55;
  background: #fff;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero {
  background: var(--navy);
  color: #fff;
  padding: 56px 0 40px;
  text-align: center;
}

.hero h1 {
  margin: 0 0 4px;
  font-size: 2.4rem;
}

.hero .tagline {
  margin: 0 0 16px;
  font-size: 1.15rem;
  color: #cfe0f2;
}

.hero .contact {
  margin: 0 0 20px;
  font-size: 0.95rem;
  color: #b7c9dc;
}

.hero .contact a {
  color: #fff;
}

.btn {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  text-decoration: none;
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 0.9rem;
}

main { padding: 48px 0; }

section { margin-bottom: 48px; }

h2 {
  font-size: 1.4rem;
  color: var(--navy);
  border-bottom: 2px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 20px;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.cert-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.15s, border-color 0.15s;
}

.cert-card:hover {
  border-color: var(--blue);
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.cert-card h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  color: var(--navy);
}

.cert-card p {
  margin: 0 0 10px;
  color: var(--gray);
  font-size: 0.9rem;
}

.cert-link {
  color: var(--blue);
  font-size: 0.88rem;
  font-weight: 600;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.skills-grid h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  color: var(--navy);
}

.skills-grid p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--gray);
}

.job { margin-bottom: 28px; }

.job h3 {
  margin: 0 0 2px;
  font-size: 1.1rem;
  color: var(--navy);
}

.job .meta {
  margin: 0 0 10px;
  font-size: 0.88rem;
  color: var(--gray);
  font-weight: 600;
}

.job p { margin: 0 0 10px; }

.job ul {
  margin: 0;
  padding-left: 20px;
}

.job li {
  margin-bottom: 4px;
  font-size: 0.95rem;
}

footer {
  background: var(--light);
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--gray);
  font-size: 0.88rem;
}

footer a { color: var(--blue); }