:root {
  --bg: #ffffff;
  --card-bg: #f8fafc; /* simple, consistent card background */
  --accent: #0b5fff; /* link and interactive accent */
  --heading-color: #0b3d91; /* separate color for large page headings (h1) */
  --text: #111827; /* very dark gray for body text */
  --muted: #6b7280; /* neutral gray for subtitles */
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 2rem 1rem;
}

.container {
  max-width: 800px;
  margin: 0 auto;
}

header {
  margin-bottom: 3rem;
}

h1 {
  font-size: 2.5rem;
  color: var(--heading-color);
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.25rem;
  color: var(--muted);
}

section {
  margin-bottom: 3rem;
}

h2 {
  font-size: 1.5rem;
  border-bottom: 2px solid var(--card-bg);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.card {
  background-color: var(--card-bg);
  padding: 1.25rem;
  border-radius: 8px;
  border: 1px solid #e6e6e6;
}

.card h3 {
  color: var(--accent);
  margin-bottom: 0.5rem;
}

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

a:hover {
  text-decoration: underline;
}

.resume-link {
  display: inline-block;
  margin-top: 0.75rem;
  background: rgba(36,162,116,0.12);
  color: var(--accent);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  border: 1px solid rgba(36,162,116,0.28);
  font-weight: 600;
}

.resume-link:hover {
  background: rgba(36,162,116,0.18);
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.card-link .card {
  transition: box-shadow 120ms ease;
}

.card-link:hover .card {
  /* keep hover subtle and simple: slight elevation via soft shadow only */
  box-shadow: 0 6px 18px rgba(16,24,40,0.04);
}

/* Accessibility: visible focus states for keyboard users */
a:focus-visible,
:focus-visible {
  outline: 3px solid rgba(11,95,255,0.18);
  outline-offset: 3px;
}

a:focus-visible,
.card-link:focus-visible,
.resume-link:focus-visible {
  outline: 3px solid rgba(11,95,255,0.22);
  outline-offset: 3px;
}