@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --bg: #07080c;
  --bg-elev: #0e1015;
  --card: #12141b;
  --muted: #8b93a5;
  --text: #eef1f7;
  --border: rgba(255,255,255,.08);
  --border-strong: rgba(255,255,255,.16);
  --radius: 16px;
  --shadow: 0 10px 30px rgba(0,0,0,.5);
  --shadow-soft: 0 6px 18px rgba(0,0,0,.35);

  --primary: #7aa2ff;
  --accent: var(--primary);
  --ring: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent);

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, Inter, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background:
    radial-gradient(900px 600px at 85% -10%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 60%),
    radial-gradient(1200px 800px at 5% 0%, #0d0f18 0%, var(--bg) 55%) fixed;
  color: var(--text);
  font: 16px/1.6 var(--font-body);
  letter-spacing: .1px;
  transition: background .4s ease;
}

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

h1, h2, h3 { font-family: var(--font-display); }

/* ====== Header ====== */
header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: linear-gradient(180deg, rgba(7,8,12,.92), rgba(7,8,12,.65) 60%, rgba(7,8,12,0));
  border-bottom: 1px solid var(--border);
}
.wrap { max-width: 1120px; margin: 0 auto; padding: 18px 20px; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }

.brand {
  display: flex; align-items: center; gap: 12px; min-width: 220px;
  cursor: pointer; background: none; border: none; padding: 0; text-align: left;
  font-family: inherit; color: inherit;
}
.brand .logo {
  width: 40px; height: 40px; display: grid; place-items: center;
  background: linear-gradient(135deg, #12192b, #0e1220);
  border: 1px solid var(--border-strong);
  border-radius: 12px; box-shadow: var(--shadow-soft);
  font-size: 20px;
}
.brand h1 { font-size: 18px; margin: 0; letter-spacing: .3px; font-weight: 650; }
.brand small { display:block; color: var(--muted); margin-top:-2px; font-size:11px; font-family: var(--font-body); letter-spacing: .2px; }

.crumb { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 220px; font-family: var(--font-mono); }
.crumb .back {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.5px; color: var(--muted); background: var(--bg-elev);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 12px; cursor: pointer; font-family: var(--font-mono);
}
.crumb .back:hover { color: var(--text); border-color: color-mix(in srgb, var(--accent) 50%, transparent); }
.crumb .path { color: var(--muted); font-size: 13px; }
.crumb .path b { color: var(--text); font-weight: 600; }

.controls { display:flex; gap:10px; flex:1; justify-content:flex-end; flex-wrap:wrap; }
.input, select, button {
  background: var(--bg-elev); color: var(--text);
  border: 1px solid var(--border); border-radius: 12px;
  padding: 10px 12px; outline: none; font-family: var(--font-body); font-size: 14px;
}
.input:focus, select:focus { box-shadow: var(--ring); border-color: color-mix(in srgb, var(--accent) 60%, transparent); }

.search { display:flex; align-items:center; gap:8px; flex:1; min-width: 220px; }
.search input { flex:1; background: transparent; border:none; color:var(--text); font-size:14px; }
.search .icon { opacity:.7; }

.btn {
  padding: 10px 14px; border-radius: 12px; border: 1px solid var(--border);
  background: linear-gradient(180deg, #141a2a, #101525);
  cursor: pointer; transition: .2s transform, .2s background, .2s border-color;
  font-size: 13.5px;
}
.btn:hover { transform: translateY(-1px); border-color: var(--border-strong); }

.tags { display:flex; gap:8px; flex-wrap:wrap; margin: 10px 0 0; font-family: var(--font-mono); }
.tag {
  font-size:11.5px; padding:6px 10px; border-radius: 999px; border:1px solid var(--border);
  background:#0f1119; color: var(--muted); cursor:pointer; user-select:none;
}
.tag.active { background: color-mix(in srgb, var(--accent) 18%, #0f1119); color: var(--text); border-color: color-mix(in srgb, var(--accent) 55%, transparent); box-shadow: var(--ring); }

main { max-width: 1120px; margin: 0 auto 90px; padding: 0 20px; }

/* ====== PICKER — subject / class / category steps ====== */
.hero { padding: 34px 0 6px; }
.hero h2 { margin: 0; font-size: clamp(26px, 4vw, 36px); letter-spacing: -.01em; font-weight: 650; }
.hero p.lede { color: var(--muted); margin: 12px 0 0; max-width: 58ch; font-size: 15px; }

.steps { margin-top: 8px; }
.step { margin-top: 36px; }
.step:first-child { margin-top: 26px; }
.step-title {
  font-family: var(--font-display); font-size: 13px; text-transform: uppercase;
  letter-spacing: .6px; color: var(--muted); margin: 0 0 14px; font-weight: 600;
}

.option-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 14px; }

.option-card, .option-card:visited {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 22px 16px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--card);
  cursor: pointer; text-align: center; text-decoration: none; font: inherit; color: inherit;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease, background .2s ease;
  animation: optionIn .4s ease both; animation-delay: calc(var(--i, 0) * .05s);
}
@keyframes optionIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.option-card:hover, .option-card:focus-visible {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--sc) 55%, var(--border-strong));
  box-shadow: var(--shadow-soft);
}
.option-card.selected {
  border-color: var(--sc);
  background: color-mix(in srgb, var(--sc) 12%, var(--card));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--sc) 25%, transparent);
}

.option-icon {
  width: 56px; height: 56px; border-radius: 14px; flex: none;
  display: grid; place-items: center; font-size: 26px; overflow: hidden;
  background: radial-gradient(circle at 35% 30%, color-mix(in srgb, var(--sc) 32%, var(--card)), var(--card));
  border: 1px solid color-mix(in srgb, var(--sc) 45%, var(--border-strong));
}
.option-icon.ic--logo {
  position: relative;
  width: 100%; height: 60px; border-radius: 10px;
  background: color-mix(in srgb, var(--sc) 10%, var(--card));
}

.option-name { font-family: var(--font-display); font-weight: 640; font-size: 15px; }
.option-status { font-size: 12.5px; color: var(--muted); }
.option-status.ready { color: color-mix(in srgb, var(--sc) 78%, var(--text)); }

/* Absolute + explicit calc() width/height (not plain 100%) so object-fit
   sizes the logo against a box that's always definite, even inside
   grid/flex parents where a percentage height on a static child can
   silently fall back to "auto" and let the image render at natural size. */
.ic-logo {
  position: absolute; top: 8px; left: 8px;
  width: calc(100% - 16px); height: calc(100% - 16px);
  object-fit: contain; display: block;
}
.subject-intro .ic.ic--logo {
  position: relative;
  width: 108px; height: 48px; min-width: 0; max-width: none;
  background: transparent; border: none;
}
.subject-intro .ic.ic--logo .ic-logo { top: 0; left: 0; width: 100%; height: 100%; }

@media (max-width: 720px) {
  .controls { justify-content: stretch; }
  .modal { grid-template-columns: 1fr; }
  .brand h1 { font-size: 16px; }
  .crumb { order: 3; width: 100%; }
}

/* ====== library subject header ====== */
.subject-intro { display:flex; align-items:center; gap:14px; margin: 40px 0 6px; flex-wrap: wrap; }
.subject-intro .ic {
  font-size: 26px; width: 50px; height: 50px; display:grid; place-items:center;
  border-radius: 13px; background: color-mix(in srgb, var(--accent) 16%, var(--card));
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  flex: none; overflow: hidden; max-width: 220px;
}
.subject-intro h2 { margin: 0; font-size: 23px; font-weight: 650; }
.subject-intro p { margin: 2px 0 0; color: var(--muted); font-size: 13.5px; }

.status-pill {
  margin-left: auto; font-family: var(--font-mono); font-size: 11.5px;
  display: inline-flex; align-items: center; gap: 7px;
  padding: 7px 12px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--muted); letter-spacing: .3px;
}
.status-pill .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); }
.status-pill.ready { color: color-mix(in srgb, var(--accent) 80%, var(--text)); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.status-pill.ready .dot { background: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent); }
.status-pill.queued .dot { background: transparent; border: 1px dashed var(--muted); }

/* ====== card grid ====== */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; margin-top: 20px; }

.card {
  position: relative; border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden; display: flex; flex-direction: column;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  min-height: 260px; background: transparent;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--sc, var(--accent)); opacity: .85; z-index: 2;
}
.card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--sc, var(--accent)) 45%, transparent); box-shadow: 0 16px 40px rgba(0,0,0,.55); }

.cover {
  position: relative; flex: none; height: 120px; min-height: 120px; max-height: 120px;
  background: linear-gradient(135deg, #182340, #0e1426);
  display: grid; place-items: center; font-size: 42px; overflow: hidden;
}
.cover img { width: 100%; height: 100%; object-fit: cover; object-position: top; display: block; transition: transform .3s ease; }
.card:hover .cover img { transform: scale(1.05); }

/* Category-logo fallback cover (no per-item photo): show the full mark,
   centered, rather than cropping it like a photo. Absolute + calc() width/
   height (not a plain percentage) so it sizes correctly inside this grid
   layout — see the same fix on .ic-logo for why a percentage falls back
   to the image's natural size here. */
.cover.cover-logo { background: color-mix(in srgb, var(--sc, var(--accent)) 16%, #0e1426); }
.cover.cover-logo img {
  position: absolute; top: 16px; left: 16px;
  width: calc(100% - 32px); height: calc(100% - 32px);
  object-fit: contain; object-position: center;
}
.card:hover .cover.cover-logo img { transform: none; }
.format-badge {
  position: absolute; top: 8px; right: 8px; font-family: var(--font-mono); font-size: 10px;
  letter-spacing: .4px; padding: 3px 7px; border-radius: 6px;
  background: rgba(7,8,12,.65); border: 1px solid rgba(255,255,255,.16); color: var(--text);
  backdrop-filter: blur(4px);
}

.content { padding: 14px; display: flex; flex-direction: column; gap: 8px; background: var(--card); }
.title { font-weight: 640; letter-spacing:.1px; font-family: var(--font-display); font-size: 15px; }
.meta { font-size: 12px; color: var(--muted); display:flex; gap:8px; flex-wrap:wrap; font-family: var(--font-mono); }
.actions { margin-top: auto; display:flex; gap:8px; }
.pill { font-size: 12px; padding: 6px 10px; border-radius: 999px; border:1px solid var(--border); color: var(--muted); font-family: var(--font-mono); }

.link { text-decoration:none; color: var(--text); }
.btn-primary {
  background: linear-gradient(180deg, color-mix(in srgb, var(--sc, var(--accent)) 34%, #141a2a), color-mix(in srgb, var(--sc, var(--accent)) 20%, #101525));
  border-color: color-mix(in srgb, var(--sc, var(--accent)) 55%, transparent);
}
.btn-outline { background: transparent; }

/* ====== empty state ====== */
.empty-state {
  grid-column: 1 / -1; border: 1px dashed var(--border-strong); border-radius: var(--radius);
  padding: 46px 24px; text-align: center; color: var(--muted); background: var(--bg-elev);
}
.empty-state .ic { font-size: 30px; margin-bottom: 10px; }
.empty-state strong { color: var(--text); display:block; margin-bottom: 4px; font-size: 15px; font-family: var(--font-display); }

/* ====== modal ====== */
dialog {
  width: min(860px, 92vw); border: none; border-radius: 18px; padding: 0;
  background: var(--card); color: var(--text); box-shadow: var(--shadow);
}
dialog::backdrop { background: rgba(0,0,0,.6); backdrop-filter: blur(3px); }
.modal { display: grid; grid-template-columns: 240px 1fr; gap: 18px; padding: 20px; }
.modal .cover {
  background: linear-gradient(135deg, #182340, #0e1426);
  min-width: 180px; max-width: 240px; min-height: 180px; max-height: 240px;
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  border-radius: 16px; overflow: hidden; margin: 0 auto;
}
.modal .cover img { width: 100%; height: 100%; object-fit: contain; object-position: center; display: block; }
.modal h2 { margin: 0; font-size: 21px; }
.modal .desc { color: var(--muted); font-size: 14px; }
.modal .row { justify-content: flex-start; }
.modal .close { position:absolute; top:12px; right:12px; }

/* ====== footer ====== */
footer { border-top: 1px solid var(--border); color: var(--muted); padding: 22px 20px; text-align:center; font-size: 13px; }

:focus-visible { outline: 2px solid color-mix(in srgb, var(--accent) 70%, white); outline-offset: 2px; }