* { box-sizing: border-box; }

:root {
  --bg: #fafafa;
  --fg: #1c1c1e;
  --muted: #666;
  --card: #ffffff;
  --card-border: rgba(0, 0, 0, 0.06);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px -12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 1px 3px rgba(0, 0, 0, 0.08), 0 16px 40px -12px rgba(0, 0, 0, 0.18);
  --accent: #3F5EBD;
  --tag-bg: #f0f2f8;
  --tag-fg: #4a5568;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #f0f0f3;
    --muted: #9095a0;
    --card: #181b22;
    --card-border: rgba(255, 255, 255, 0.06);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.5), 0 8px 24px -12px rgba(0, 0, 0, 0.6);
    --shadow-hover: 0 1px 3px rgba(0, 0, 0, 0.6), 0 16px 40px -12px rgba(0, 0, 0, 0.8);
    --accent: #8aa1ff;
    --tag-bg: #232733;
    --tag-fg: #b8bfcc;
  }
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

header {
  text-align: center;
  padding: 4rem 1rem 2.5rem;
}

header h1 {
  margin: 0;
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 60%, var(--fg)));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header .tagline {
  margin: 0.6rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.filter-btn {
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.filter-btn:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--card-border));
}

.filter-btn:active {
  transform: scale(0.97);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.filter-count {
  font-size: 0.74rem;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-fg);
  font-weight: 600;
  min-width: 20px;
  text-align: center;
}

.filter-btn.active .filter-count {
  background: rgba(255, 255, 255, 0.22);
  color: white;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.grid[aria-busy="true"]::after {
  content: "Loading…";
  display: block;
  grid-column: 1 / -1;
  text-align: center;
  color: var(--muted);
  padding: 3rem 1rem;
  font-size: 0.95rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--accent) 30%, var(--card-border));
}

.card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.card.hidden {
  display: none;
}

.author-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
}

.author-badge.claude {
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 28%, transparent);
}

.author-badge.co-work {
  background: color-mix(in srgb, #14b8a6 14%, transparent);
  color: #0d9488;
  border-color: color-mix(in srgb, #14b8a6 28%, transparent);
}

.author-badge.codex {
  background: color-mix(in srgb, #10b981 14%, transparent);
  color: #10b981;
  border-color: color-mix(in srgb, #10b981 28%, transparent);
}

.author-badge.human {
  background: var(--tag-bg);
  color: var(--tag-fg);
  border-color: var(--card-border);
}

@media (prefers-color-scheme: dark) {
  .author-badge.co-work {
    color: #5eead4;
    background: color-mix(in srgb, #5eead4 14%, transparent);
    border-color: color-mix(in srgb, #5eead4 30%, transparent);
  }
  .author-badge.codex {
    color: #4ade80;
    background: color-mix(in srgb, #4ade80 14%, transparent);
    border-color: color-mix(in srgb, #4ade80 30%, transparent);
  }
}

.card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  padding-right: 5rem;
}

.emoji {
  font-size: 2rem;
  line-height: 1;
  flex-shrink: 0;
}

.card-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.card-blurb {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.92rem;
  flex-grow: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.tag {
  background: var(--tag-bg);
  color: var(--tag-fg);
  font-size: 0.72rem;
  padding: 3px 9px;
  border-radius: 999px;
  font-weight: 500;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.78rem;
  color: var(--muted);
  border-top: 1px solid var(--card-border);
  padding-top: 0.75rem;
  margin-top: auto;
}

.card-built {
  font-style: italic;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-arrow {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.card:hover .card-arrow {
  transform: translateX(3px);
}

footer {
  text-align: center;
  padding: 2rem 1rem 3rem;
  color: var(--muted);
  font-size: 0.83rem;
}

footer strong {
  color: color-mix(in srgb, var(--fg) 80%, transparent);
  font-weight: 600;
}

@media (max-width: 480px) {
  header { padding: 2.5rem 1rem 1.5rem; }
  .grid { grid-template-columns: 1fr; }
  .card { padding: 1.25rem; }
}