:root {
  color-scheme: light;
  --ink: #17202a;
  --muted: #5b6876;
  --faint: #8a96a3;
  --line: #e1e6ec;
  --surface: #ffffff;
  --wash: #f4f6f9;
  --accent: #0f766e;
  --accent-soft: #e3f3f1;
  --f-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
}
body[data-stage="ks4"] { --accent: #4338ca; --accent-soft: #ebeafe; }
body[data-stage="ks5"] { --accent: #c2410c; --accent-soft: #fdeee5; }

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--surface);
  color: var(--ink);
  font: 400 15px/1.5 var(--f-body);
  -webkit-text-size-adjust: 100%;
}
a { color: inherit; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 20px 16px 40px; }

/* Header */
.top { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 8px 16px; margin-bottom: 18px; }
.eyebrow { margin: 0 0 2px; font-size: .78rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); }
h1 { margin: 0; font: 800 clamp(1.7rem, 4vw, 2.3rem)/1.1 var(--f-display); letter-spacing: -.02em; }
.lede { margin: 4px 0 0; color: var(--muted); }
.home-link { display: inline-flex; align-items: center; gap: 6px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; font-size: .88rem; font-weight: 500; text-decoration: none; color: var(--muted); background: var(--surface); }
.home-link:hover { border-color: var(--faint); color: var(--ink); }

/* Strand filter */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 22px; padding: 0; list-style: none; }
.chip { font: 500 .88rem var(--f-body); padding: 7px 13px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; min-height: 36px; }
.chip:hover { border-color: var(--faint); }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip .n { opacity: .65; margin-left: 4px; font-variant-numeric: tabular-nums; }

/* Strand sections */
.strand { margin: 0 0 28px; }
.strand[hidden] { display: none; }
.strand h2 { display: flex; align-items: center; gap: 10px; margin: 0 0 12px; font: 600 1.15rem/1.2 var(--f-display); }
.strand h2::before { content: ""; width: 10px; height: 10px; border-radius: 3px; background: var(--accent); flex: none; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }

/* Cards */
.card { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: var(--surface); text-decoration: none; color: inherit; transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease; }
a.card:hover { transform: translateY(-2px); border-color: var(--faint); box-shadow: 0 10px 24px -18px rgba(20, 30, 45, .5); }
a.card:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.thumb { aspect-ratio: 16 / 10; background: var(--wash); display: block; position: relative; overflow: hidden; }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb .ph { position: absolute; inset: 0; display: grid; place-items: center; font: 800 2.4rem var(--f-display); color: var(--faint); letter-spacing: -.03em; background: repeating-linear-gradient(135deg, var(--wash) 0 14px, #eef1f5 14px 28px); }
.thumb .ph.soon-ph { font: 600 .78rem var(--f-body); letter-spacing: .08em; text-transform: uppercase; }
.body { padding: 12px 14px 14px; display: flex; flex-direction: column; gap: 4px; flex: 1; }
.name { margin: 0; font: 600 1.02rem/1.25 var(--f-display); }
.blurb { margin: 0; color: var(--muted); font-size: .88rem; line-height: 1.4; flex: 1; }
.meta { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 8px; font-size: .8rem; }
.tag { padding: 2px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.go { color: var(--accent); font-weight: 600; margin-left: auto; }
.card.soon { opacity: .62; }
.card.soon .go { color: var(--faint); }

.note { color: var(--faint); font-size: .82rem; margin-top: 8px; }
.empty { padding: 28px 20px; border: 1px dashed var(--line); border-radius: 14px; color: var(--muted); text-align: center; }

/* Home page */
.stage-block { margin: 0 0 26px; }
.stage-block h2 { margin: 0 0 10px; font: 600 .82rem var(--f-body); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.page-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.page-card { display: block; padding: 18px; border: 1px solid var(--line); border-radius: 14px; text-decoration: none; border-top: 5px solid var(--c, var(--accent)); transition: transform .15s ease, border-color .15s ease; }
.page-card:hover { transform: translateY(-2px); border-color: var(--faint); border-top-color: var(--c, var(--accent)); }
.page-card b { display: block; font: 700 1.25rem/1.2 var(--f-display); }
.page-card span { color: var(--muted); font-size: .88rem; }

@media (max-width: 480px) {
  .grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .blurb { display: none; }
  .body { padding: 10px 11px 12px; }
}
@media (prefers-reduced-motion: reduce) {
  .card, .page-card { transition: none; }
  a.card:hover, .page-card:hover { transform: none; }
}

/* In-frame viewer (only used when OPEN_MODE is "same-frame") */
body[data-view="viewer"] { display: flex; flex-direction: column; height: 100vh; height: 100dvh; }
.vbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; padding: 8px 12px; border-bottom: 1px solid var(--line); background: var(--surface); }
.vname { flex: 1; min-width: 0; text-align: center; font: 600 1rem/1.2 var(--f-display); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.vframe { flex: 1; width: 100%; border: 0; display: block; }