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

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-hover: #1c2330;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;

  --ts: #3178c6;
  --py: #3572a5;
  --go: #00add8;
  --kotlin: #a97bff;
  --svelte: #ff3e00;
  --shell: #4EAA25;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Header ─── */
header {
  border-bottom: 1px solid var(--border);
  padding: 3rem 1.5rem 2.5rem;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
}

.header-text h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.tagline {
  color: var(--text-muted);
  margin: 0.25rem 0 0.75rem;
  font-size: 0.95rem;
}

.gh-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.gh-link:hover { color: var(--accent-hover); }

.gh-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ─── Main ─── */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  flex: 1;
  width: 100%;
}

/* ─── Filter bar ─── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 2rem;
  padding: 0.35rem 1rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0d1117;
  font-weight: 600;
}

/* ─── Grid ─── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

/* ─── Cards ─── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
}

.card:hover {
  border-color: var(--accent);
  background: var(--surface-hover);
  transform: translateY(-2px);
}

.card.hidden {
  display: none;
}

.card-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.card-title-row h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.card-footer {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* ─── Tags ─── */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  background: rgba(88, 166, 255, 0.1);
  border: 1px solid rgba(88, 166, 255, 0.2);
  color: var(--accent);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
}

/* ─── Lang badges ─── */
.lang-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 3px;
  white-space: nowrap;
  flex-shrink: 0;
  color: #fff;
}

.lang-badge.typescript { background: var(--ts); }
.lang-badge.python { background: var(--py); }
.lang-badge.go { background: var(--go); color: #000; }
.lang-badge.kotlin { background: var(--kotlin); }
.lang-badge.svelte { background: var(--svelte); }
.lang-badge.shell { background: var(--shell); }

/* ─── Repo link ─── */
.repo-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.83rem;
  font-weight: 500;
  transition: color 0.2s;
  align-self: flex-end;
}

.repo-link:hover { color: var(--accent); }

/* ─── Footer ─── */
footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

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

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

/* ─── Responsive ─── */
@media (max-width: 520px) {
  .header-inner { flex-direction: column; text-align: center; }
  .gh-link { justify-content: center; }
  .grid { grid-template-columns: 1fr; }
}