:root {
  --bg: #ffffff;
  --text: #0b0f19;
  --muted: #5b6474;
  --card: #f5f6f8;
  --border: #e2e4ea;
  --link: #0b62ff;
}

html[data-theme="dark"] {
  --bg: #0b0f19;
  --text: #eef2ff;
  --muted: #aab3c3;
  --card: #141a2a;
  --border: #232b3d;
  --link: #7aa7ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

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

header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
}

.nav {
  max-width: 960px;
  margin: auto;
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-weight: 800;
}

nav a {
  margin-right: 14px;
  font-size: 14px;
}

nav button {
  padding: 6px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  cursor: pointer;
}

.container {
  max-width: 960px;
  margin: auto;
  padding: 28px 20px;
}

.hero h1 {
  font-size: 34px;
  margin: 0;
}

.hero p {
  color: var(--muted);
  max-width: 60ch;
}

.links {
  margin-top: 14px;
}
.links a {
  margin-right: 14px;
  font-weight: 600;
}

h2 {
  margin-top: 36px;
  font-size: 18px;
}

.grid {
  display: grid;
  gap: 16px;
}
@media (min-width: 820px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.card h3 {
  margin-top: 0;
}

.tags {
  margin-top: 10px;
}
.tags span {
  display: inline-block;
  padding: 6px 10px;
  margin: 4px 6px 0 0;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

.project-links a {
  margin-right: 10px;
  font-weight: 600;
}

footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 20px;
  color: var(--muted);
  font-size: 13px;
}