/* ── Design tokens ─────────────────────────────────────────────────────────── */
:root {
  --bg:          #0f172a;
  --surface:     #1e293b;
  --surface-2:   #263347;
  --text:        #f1f5f9;
  --text-dim:    #94a3b8;
  --accent:      #38bdf8;
  --accent-glow: rgba(56,189,248,0.12);
  --border:      #334155;
  --radius:      10px;
}

/* ── Reset / base ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, sans-serif;
  padding: 2rem;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Header ────────────────────────────────────────────────────────────────── */
header {
  max-width: 1100px;
  margin: 0 auto 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

h1 {
  font-size: 2.2rem;
  color: var(--accent);
  line-height: 1.1;
  margin-bottom: 0.3rem;
}

header p {
  color: var(--text-dim);
  font-size: 0.95rem;
}

#project-count {
  font-size: 0.78rem;
  color: var(--text-dim);
  white-space: nowrap;
  align-self: flex-end;
}

/* ── Filter bar ────────────────────────────────────────────────────────────── */
#filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: 1100px;
  margin: 0 auto 2rem;
}

.filter-btn {
  font-size: 0.78rem;
  font-family: inherit;
  padding: 0.3rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.15s;
}

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

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0f172a;
  font-weight: 600;
}

/* ── Project grid root ─────────────────────────────────────────────────────── */
#project-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* ── Section labels ────────────────────────────────────────────────────────── */
.section-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

/* ── Featured grid — 2-up wide cards ──────────────────────────────────────── */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
  gap: 1.25rem;
}

.featured-card {
  border-color: rgba(56,189,248,0.3) !important;
  background: linear-gradient(135deg, #1e293b 0%, #1a2d42 100%);
}

.featured-card:hover {
  box-shadow: 0 0 0 1px rgba(56,189,248,0.4), 0 12px 32px rgba(0,0,0,0.4);
}

.featured-card h3 {
  font-size: 1.15rem !important;
}

/* ── Main grid — 3-col compact cards ──────────────────────────────────────── */
.main-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

/* ── Project card ──────────────────────────────────────────────────────────── */
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: transform 0.18s, border-color 0.18s, box-shadow 0.18s;
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: rgba(56,189,248,0.4);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3), 0 0 0 1px var(--accent-glow);
}

/* ── Card top row: category chip + language badge ──────────────────────────── */
.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.cat-chip {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  background: color-mix(in srgb, var(--cc, #64748b) 15%, transparent);
  color: var(--cc, #94a3b8);
  border: 1px solid color-mix(in srgb, var(--cc, #64748b) 30%, transparent);
}

.lang-badge {
  font-size: 0.62rem;
  font-weight: 600;
  padding: 0.18rem 0.5rem;
  border-radius: 4px;
  background: color-mix(in srgb, var(--lc, #64748b) 15%, transparent);
  color: var(--lc, #94a3b8);
  border: 1px solid color-mix(in srgb, var(--lc, #64748b) 25%, transparent);
  white-space: nowrap;
}

/* ── Title ─────────────────────────────────────────────────────────────────── */
.project-card h3 {
  font-size: 0.97rem;
  font-weight: 600;
  color: var(--text);
  text-transform: capitalize;
  line-height: 1.3;
  margin: 0;
}

/* ── Description ───────────────────────────────────────────────────────────── */
.project-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
  margin: 0;
}

/* ── Tags ──────────────────────────────────────────────────────────────────── */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.tag {
  font-size: 0.65rem;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(56,189,248,0.08);
  color: var(--accent);
  border: 1px solid rgba(56,189,248,0.15);
  white-space: nowrap;
}

/* ── Card footer ───────────────────────────────────────────────────────────── */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
  gap: 0.5rem;
}

.updated {
  font-size: 0.67rem;
  color: #475569;
}

.card-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.card-footer a {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s;
}

.card-footer a:hover { color: #7dd3fc; text-decoration: underline; }

.demo-link {
  font-size: 0.78rem;
  font-weight: 600;
  color: #34d399 !important;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s;
}

.demo-link:hover { color: #6ee7b7 !important; text-decoration: underline; }

/* ── Archive toggle ────────────────────────────────────────────────────────── */
#archive-section {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

.archive-toggle {
  font-size: 0.8rem;
  font-family: inherit;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: all 0.15s;
  margin-bottom: 1rem;
}

.archive-toggle:hover {
  border-color: var(--text-dim);
  color: var(--text);
}

.archive-grid {
  opacity: 0.65;
}

.hidden { display: none !important; }

/* ── Loading ───────────────────────────────────────────────────────────────── */
#loading {
  text-align: center;
  color: var(--text-dim);
  padding: 3rem;
}

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  body { padding: 1rem; }
  h1 { font-size: 1.7rem; }

  .featured-grid,
  .main-grid {
    grid-template-columns: 1fr;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
  }
}