:root {
  --emerald: #0B5D3B;
  --emerald-deep: #094b30;
  --ink: #0A1410;
  --paper: #F5F7F4;
  --citron: #9FE870;
  --slate: #5E6B63;
  --line: #d9e0da;
  --card: #ffffff;

  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "Cascadia Code", monospace;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-pill: 999px;
  --maxw: 1100px;
}

* { box-sizing: border-box; }

/* Author display rules (.grid) outrank the UA [hidden] style, so hide() on a
   grid would otherwise have no effect. Make hidden authoritative. */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--emerald); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); overflow: hidden;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--citron);
  color: var(--ink);
  padding: 10px 16px;
  z-index: 10;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; }

/* ---------- Dark shell: brand bar + hero share one continuous background ---------- */
.hero-shell {
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(159, 232, 112, 0.12), transparent 55%),
    var(--ink);
  color: var(--paper);
  border-bottom: 3px solid var(--emerald);
}

/* Slim brand mark at the very top — identity, not navigation. */
.brand-bar { padding: 12px 0 0; }
.brand-bar-inner {
  display: flex;
  align-items: center;
  gap: 14px;
}
.brand-logo {
  display: block;
  height: 44px;
  width: auto;
  flex-shrink: 0;
  /* The mark has ~15.5% transparent padding baked in; pull left so its visible
     edge lines up with the headline's left edge (≈0.155 × 44px display ≈ 7px). */
  margin-left: -7px;
}
.brand-name {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  line-height: 1; /* hug the glyphs so it optically centers against the mark */
  color: var(--citron);
  white-space: nowrap;
}

.hero { padding: 26px 0 52px; }

.site-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}

.lede {
  max-width: 46ch;
  color: #cdd6cf;
  font-size: 1.05rem;
  margin: 0 0 28px;
}

.prompt {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(159, 232, 112, 0.3);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
}
.prompt-path { color: var(--citron); }
.prompt-sigil { color: #8a988d; }
.prompt-cmd { color: var(--paper); }
.prompt-cursor {
  width: 9px;
  height: 1.05em;
  background: var(--citron);
  display: inline-block;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* Hero call-to-action + live counts. */
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 24px;
}

.cta-submit {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--citron);
  text-decoration: none;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.cta-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(159, 232, 112, 0.22);
}
.cta-submit:active { transform: translateY(0); box-shadow: none; }
.cta-submit:focus-visible {
  outline: 3px solid var(--citron);
  outline-offset: 3px;
}

.hero-stats {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #9fb0a4;
  margin: 0;
}

.badge-studentrun {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: #9fb0a4;
  margin: 26px 0 0;
}

/* ---------- Controls ---------- */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  margin-top: 32px;
  margin-bottom: 8px;
}

.search-field { flex: 1 1 280px; }

.search-input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--card);
  color: var(--ink);
}
.search-input:focus-visible {
  outline: 3px solid var(--citron);
  outline-offset: 1px;
  border-color: var(--emerald);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--card);
  color: var(--slate);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s, transform 0.1s;
}
.chip:hover { border-color: var(--emerald); color: var(--emerald); }
.chip:active { transform: scale(0.97); }
.chip[aria-pressed="true"] {
  background: var(--emerald);
  border-color: var(--emerald);
  color: #fff;
}
.chip:focus-visible {
  outline: 3px solid var(--citron);
  outline-offset: 2px;
}

/* ---------- Result count + states ---------- */
.result-count {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--slate);
  margin: 20px 0 16px;
}

.state {
  font-family: var(--font-mono);
  color: var(--slate);
  padding: 48px 0;
  text-align: center;
}
.state p { margin: 0 0 16px; }
.state-error { color: #a23b2d; }

.link-button {
  font: inherit;
  color: var(--emerald);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
}
.link-button:focus-visible {
  outline: 2px solid var(--citron);
  outline-offset: 2px;
  border-radius: 2px;
}

.btn-retry {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--paper);
  background: var(--emerald);
  border: none;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s ease;
}
.btn-retry:hover { background: var(--emerald-deep); }
.btn-retry:focus-visible {
  outline: 3px solid var(--citron);
  outline-offset: 2px;
}

/* Skeleton placeholders shown while index.json loads. */
.card-skeleton {
  gap: 12px;
  pointer-events: none;
}
.sk {
  display: block;
  background: linear-gradient(90deg, #eef1ee 25%, #e3e8e3 37%, #eef1ee 63%);
  background-size: 400% 100%;
  border-radius: 6px;
  animation: sk-shimmer 1.4s ease infinite;
}
.sk-handle { width: 45%; height: 11px; }
.sk-title { width: 70%; height: 22px; margin-top: 4px; }
.sk-line { width: 100%; height: 12px; }
.sk-short { width: 60%; }
@keyframes sk-shimmer {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

/* ---------- Grid + cards ---------- */
.grid {
  list-style: none;
  margin: 0 0 64px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(10, 20, 16, 0.09);
  border-color: var(--emerald);
}

.card-handle {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--slate);
  text-decoration: none;
  word-break: break-all;
  border-bottom: 1px dashed transparent;
  align-self: flex-start;
}
.card-handle::before { content: "▸ "; color: var(--emerald); }
.card-handle:hover { color: var(--emerald); border-bottom-color: var(--emerald); }
.card-handle:focus-visible {
  outline: 2px solid var(--citron);
  outline-offset: 3px;
  border-radius: 2px;
}

.card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  margin: 12px 0 8px;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--slate);
  margin: 0 0 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.card-meta-sep { opacity: 0.5; }
.card-cat {
  margin-left: auto;
  background: rgba(11, 93, 59, 0.1);
  color: var(--emerald);
  padding: 2px 9px;
  border-radius: 999px;
}

.card-summary {
  margin: 0 0 16px;
  color: #2b342e;
  flex: 1 1 auto;
}

.card-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 16px;
  padding: 0;
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--slate);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 3px 8px;
  cursor: pointer;
}
.tag:hover { border-color: var(--emerald); color: var(--emerald); }
.tag:focus-visible { outline: 2px solid var(--citron); outline-offset: 1px; }

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
  font-size: 0.85rem;
}
.card-links a {
  font-weight: 600;
  text-decoration: none;
}
.card-links a:hover { text-decoration: underline; }
.card-links a:focus-visible {
  outline: 2px solid var(--citron);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: #cdd6cf;
  padding: 44px 0;
}
.footer-cta { font-size: 1.05rem; margin: 0 0 18px; color: var(--paper); }
.footer-cta a { color: var(--citron); }
.footer-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  padding: 0;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.footer-links a { color: #cdd6cf; text-decoration: none; }
.footer-links a:hover { color: var(--citron); }
.footer-fine { font-size: 0.76rem; color: #7d8a80; margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .wrap { padding: 0 18px; }
  .brand-bar { padding: 10px 0 0; }
  .brand-logo { height: 36px; margin-left: -6px; } /* match the smaller display size */
  .brand-name { font-size: 0.68rem; letter-spacing: 0.12em; }
  .hero { padding: 20px 0 34px; }
  .controls { flex-direction: column; align-items: stretch; }
  /* Stop the 280px flex-basis becoming a vertical height in column layout. */
  .search-field { flex: 0 1 auto; }
  .prompt { font-size: 0.82rem; max-width: 100%; overflow: hidden; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}