body {
  margin: 0;
  font-family: "Arial", Tahoma, sans-serif;
  background: #f8fafc;
  color: #1e293b;
  line-height: 1.6;
}

/* Header */
header {
  background: linear-gradient(135deg, #000104, #42464b);
  color: white;
  text-align: center;
  padding: 0.5rem 1rem 1rem;
}
header h1 {
  margin: 0;
  font-size: 2rem;
}
.subtitle {
  margin-top: 0.25rem;
  font-weight: 300;
}

.profile-pic {
  border-radius: 50%;
  margin-bottom: 0.5rem;
  border: 3px solid #fafbfd;
}

/* Navigation */
nav {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
  gap: 0.5rem;
}
.nav-btn {
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: #e0e7ff;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  font-weight: 500;
  transition: background 0.3s;
}
.nav-btn:hover,
.nav-btn.active {
  background: rgba(255, 255, 255, 0.4);
}

/* Panels */
main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
}
.panel {
  display: none;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.panel.visible {
  display: block;
  opacity: 1;
}

/* Section headings */
h2 {
  border-bottom: 2px solid #333334;
  padding-bottom: 0.3rem;
  margin-bottom: 1rem;
}
.job {
  margin-bottom: 1.5rem;
}
.job h3 {
  margin: 0;
  font-size: 1.1rem;
}
.years {
  color: #64748b;
  font-size: 0.9rem;
}

/* Header grid */
.headergrid {
  display: grid;
  width: 100%;
  grid-template-columns: repeat(auto-fit, minmax(10px, 1fr));
  gap: 0.5rem;
  list-style: none;
  padding: 0;
}

.headergrid li {
  border-radius: 0.25rem;
  align-content: center;
}

/* Skills grid */
.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.5rem;
  list-style: none;
  padding: 0;
}

.skills li {
  background: #d2d5d6;
  border-left: 4px solid #4b525c;
  padding: 0.5rem 0.75rem;
  border-radius: 0.25rem;
}

/* Certifications grid */
.certs {
  display: grid;
  grid-template-columns: 100%;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
}
.certs li {
  background: #d2d5d6;
  border-left: 4px solid #424446;
  padding: 0.5rem 0.75rem;
  border-radius: 0.25rem;
}

footer {
  text-align: center;
  background: #383f51;
  color: #e0e7ff;
  padding: 1rem;
  margin-top: 2rem;
}

@media (max-width: 600px) {
  header h1 {
    font-size: 2rem;
  }
}