/* Catalogue pages: a subject as a journey of stages (templates/pages/subject.php) and a course as a star system with its
   units (templates/pages/course.php). Loaded after content.css, so these rules override it. Colours are tokens or mixes of
   tokens; a hairline is only a row rule. */

/* Hero: text on the left, a night window on the right from 900px. */
.cat-hero { display: grid; gap: var(--sp-6); align-items: center; }
.cat-hero__text { display: grid; gap: var(--sp-3); align-content: center; min-width: 0; }
.cat-hero__text h1, .cat-hero__text .muted { margin: 0; }
@media (min-width: 900px) { .cat-hero { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--sp-7); } }

/* A night window: the labview treatment (a tinted glow at the foot, star dust, a dark gradient, inset shade). */
.cat-galaxy, .cat-system { position: relative; display: block; overflow: hidden; margin: 0; border-radius: var(--r-lg);
  background-image: radial-gradient(120% 80% at 50% 120%, color-mix(in srgb, var(--tint) 26%, transparent), transparent 62%), var(--stardust), linear-gradient(180deg, color-mix(in srgb, var(--tint) 7%, var(--bg-raised)), var(--bg));
  background-size: auto, 180px 180px, auto; background-repeat: no-repeat, repeat, no-repeat;
  box-shadow: inset 0 2px 12px var(--glass-shade), inset 0 -1px 0 color-mix(in srgb, var(--tint) 30%, transparent); }
.cat-galaxy { aspect-ratio: 400 / 220; }
.cat-galaxy .sgalaxy { display: block; width: 100%; height: 100%; }
.cat-system { aspect-ratio: 420 / 260; }
.cat-system svg { display: block; width: 100%; height: 100%; }

/* The star system: a bone star lit from the subject hue, a halo, and one planet per topic. */
.cat-system .cat-halo { fill: var(--tint); fill-opacity: .3; filter: blur(9px); }
.cat-star__in { stop-color: var(--bone); }
.cat-star__out { stop-color: var(--tint); }
.cat-system .cat-planet { fill: color-mix(in srgb, var(--tint) 55%, var(--bone)); stroke: var(--bg); stroke-width: 1; }
.cat-cta { margin: var(--sp-2) 0 0; }

/* Subject: the stages run down a path (a 2px rule), each with its label beside it and its courses as cards. */
.cat-journey { position: relative; margin-top: var(--sp-5); padding-left: var(--sp-6); }
.cat-journey::before { content: ""; position: absolute; left: 7px; top: var(--sp-3); bottom: var(--sp-4); width: 2px;
  background: color-mix(in srgb, var(--line-strong) 40%, transparent); }
.cat-stage + .cat-stage { margin-top: var(--sp-6); }
.cat-stage__label { margin: 0 0 var(--sp-3); font: 600 1rem/1.3 var(--font-ui); color: var(--text-2); }
.cat-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--sp-3); }
.cat-card { position: relative; isolation: isolate; display: flex; align-items: flex-start; gap: var(--sp-3); height: 100%;
  box-sizing: border-box; padding: var(--sp-4); border-radius: var(--r-lg); color: var(--text); text-decoration: none;
  transition: transform .2s var(--ease); }
/* The brightening is a tinted layer behind the card's text: it fades in, so it never changes the card's own background. */
.cat-card::before { content: ""; position: absolute; inset: 0; z-index: -1; border-radius: inherit;
  background: color-mix(in srgb, var(--tint) 14%, transparent); opacity: 0; transition: opacity .2s var(--ease); }
.cat-card:hover::before, .cat-card:focus-visible::before { opacity: 1; }
.cat-card .orb { margin-top: 2px; }
.cat-card__text { display: grid; gap: 2px; min-width: 0; }
.cat-card strong { font-weight: 600; line-height: 1.3; }
.cat-card small { color: var(--text-3); font-size: .85rem; line-height: 1.4; }
.cat-card__count { color: var(--text-3); font-size: .85rem; }
@media (prefers-reduced-motion: no-preference) { .cat-card:hover { transform: translateY(-2px); } }
@media (prefers-reduced-motion: reduce) { .cat-card, .cat-card::before { transition: none; } }

/* Course: the units are glass cards, one column, each headed by a numbered planet badge. */
.cat-units { max-width: 900px; padding-bottom: var(--sp-7); }
.cat-unit { margin-top: var(--sp-4); padding: var(--sp-4) var(--sp-5) var(--sp-2); border-radius: var(--r-lg); }
.cat-unit__h { display: flex; align-items: center; gap: var(--sp-3); margin: 0 0 var(--sp-2); font-size: 1.15rem; line-height: 1.3; }
.cat-badge { flex: none; display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: radial-gradient(circle at 34% 30%, color-mix(in srgb, var(--tint), var(--lit-hi) 40%) 0, var(--tint) 46%, color-mix(in srgb, var(--tint), var(--bg) 40%) 100%);
  color: var(--on-hue); font: 600 .85rem/1 var(--font-mono); font-variant-numeric: tabular-nums; }
.cat-rows { list-style: none; margin: 0; padding: 0; }
.cat-rows li + li { border-top: 1px solid var(--line); }
.cat-row { display: grid; grid-template-columns: 22px minmax(0, 1fr) auto; align-items: center; gap: var(--sp-3); padding: var(--sp-3) 0;
  color: var(--text); text-decoration: none; }
.cat-row__glyph { display: block; line-height: 0; }
.cat-row__text { display: grid; gap: 2px; min-width: 0; }
.cat-row strong { font-weight: 600; line-height: 1.35; }
.cat-row small { color: var(--text-2); font-size: .9rem; line-height: 1.45; }
.cat-row__hours { color: var(--text-3); font-size: .85rem; white-space: nowrap; }
.cat-row:hover strong, .cat-row:focus-visible strong { color: var(--accent-text); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .2em; }
/* The new world's introduction shares the catalogue's surfaces and the lesson's exploration controls. */
.earning-world__brief { padding: var(--sp-5); display: grid; gap: var(--sp-4); }
.earning-world__brief p { margin: 0; }
.earning-world__outcomes { margin-top: var(--sp-6); }
.earning-world__outcomes ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-4) var(--sp-6); padding-left: var(--sp-5); color: var(--text-2); }
.earning-world__outcomes li { padding-left: var(--sp-2); }
.earning-world > .exploration { margin-block: var(--sp-5); }
@media (max-width: 600px) { .earning-world__outcomes ol { grid-template-columns: 1fr; } }
.earning-cases { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-4); margin-block: var(--sp-5); }
.earning-cases article { padding: var(--sp-5); }
.earning-cases article h3 { margin-top: 0; }
@media (max-width: 700px) { .earning-cases { grid-template-columns: 1fr; } }
@media (min-width: 1000px) {
  .earning-world[data-dom="earn"] { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: var(--sp-6); align-items: start; }
  .earning-world[data-dom="earn"] .earning-world__outcomes { margin-top: 0; }
  .earning-world[data-dom="earn"] .earning-world__outcomes ol { grid-template-columns: 1fr; }
}