:root {
  --bg-light: #edf1f7;
  --bg-dark: #050914;
  --card-light: #ffffff;
  --card-dark: #111a2e;
  --text-light: #0f172a;
  --text-dark: #f5f7ff;
  --accent-start: #0a1d4d;
  --accent-end: #3a7bd5;
  --surface-muted: rgba(255, 255, 255, 0.15);
  --tag-blue: #d6e4ff;
  --tag-orange: #ffe4c1;
  --tag-green: #d4f8d4;
  --tag-purple: #e3d7ff;
  --tag-pink: #ffd5e5;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg-light);
  color: var(--text-light);
  font-family: 'Space Grotesk', 'JetBrains Mono', monospace;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
}

[data-theme="dark"] {
  background: var(--bg-dark);
  color: var(--text-dark);
}

header {
  background: linear-gradient(130deg, var(--accent-start), var(--accent-end));
  color: white;
  text-align: center;
  padding: 70px 20px 100px;
  position: relative;
}

.subtitle {
  font-size: 1.1rem;
  opacity: 0.92;
  margin: 0 auto 10px;
}

nav {
  position: sticky;
  top: 0;
  background: rgba(5, 12, 40, 0.85);
  backdrop-filter: blur(12px);
  padding: 10px;
  display: flex;
  justify-content: center;
  gap: 40px;
  z-index: 100;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.02em;
}

nav a:hover {
  text-decoration: underline;
}

.profile-pic {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  border: 4px solid white;
  margin: 20px auto;
  object-fit: cover;
  display: block;
}

.social-icons a {
  color: white;
  font-size: 1.8rem;
  margin: 0 12px;
}

.section {
  max-width: 900px;
  margin: auto;
  padding: 40px 20px;
  color: inherit;
}

.card {
  background: var(--card-light);
  padding: 20px;
  border-radius: 8px;
  margin: 25px 0;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.12);
  transition: transform 0.2s, box-shadow 0.2s;
}

[data-theme="dark"] .card {
  background: var(--card-dark);
  color: var(--text-dark);
}

.card:hover {
  transform: scale(1.01);
  box-shadow: 0 6px 28px rgba(0, 0, 0, 0.25);
}

.tags {
  margin-top: 10px;
}

.edu-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
}

.coursework-label {
  margin: 12px 0 4px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-end);
}

.coursework-list {
  margin: 0;
  padding-left: 18px;
  font-size: 0.9rem;
  color: inherit;
}

.edu-logo {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
  flex-shrink: 0;
  border: 1px solid rgba(5, 12, 40, 0.1);
  background: var(--card-light);
  padding: 0px;
  object-fit: cover;
  display: block;
  align-self: start;
}

.edu-logo.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--accent-end);
  border-style: dashed;
}

[data-theme="dark"] .edu-logo {
  background: var(--card-dark);
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-dark);
}

.edu-card h3 {
  margin: 0 0 6px;
}

.tag {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 999px;
  margin: 3px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: transform 0.15s;
}

.tag:hover {
  transform: translateY(-2px);
}

/* Color-coded categories */
.lang {
  background: var(--tag-blue);
  color: #132d74;
}

.framework {
  background: var(--tag-purple);
  color: #402070;
}

.concept {
  background: var(--tag-green);
  color: #146b34;
}

.sys {
  background: var(--tag-orange);
  color: #7a3b00;
}

.misc {
  background: var(--tag-pink);
  color: #781433;
}

.github-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 4px 14px;
  border-radius: 999px;
  border: 1px solid #24292e;
  text-decoration: none;
  font-size: 0.85rem;
  color: #24292e;
  transition: 0.2s;
}

.github-pill:hover {
  background: #24292e;
  color: white;
}

.dark-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--surface-muted);
  padding: 8px 14px;
  border-radius: 6px;
  color: white;
  cursor: pointer;
  font-size: 0.9rem;
  user-select: none;
}

h1,
h2,
h3 {
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.3;
  color: inherit;
}

p,
li {
  max-width: 80ch;
}

footer {
  padding: 20px;
  text-align: center;
}