/* Public site: header, footer, subjects, pricing, content chrome. The landing page has its own blocks (hero, atlas, instrument, shelf, chips, night), kept in this file until the landing rebuild removes them. */
ul.plain { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--sp-2); }
ul.plain a { color: var(--text-2); text-decoration: none; } ul.plain a:hover { color: var(--text); text-decoration: underline; }

/* Header: [brand] [nav] [theme] [lang] [account]: a cockpit strip. The ground is translucent and blurred; its bottom hairline
   fades in at both ends (cyan, then violet) and is the strip's only rule. Nav links carry no background: on hover or focus
   the word brightens and a thin light beam (cyan through violet, a tight glow) grows from the centre under it. The current
   section keeps its beam at full width. */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 62%, transparent); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); }
.site-header::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--cyan) 50%, transparent) 35%, color-mix(in srgb, var(--violet) 50%, transparent) 65%, transparent); pointer-events: none; }
.site-header__row { display: flex; align-items: center; gap: var(--sp-5); min-height: 64px; }
.site-nav { display: flex; gap: var(--sp-2); margin-right: auto; }
.site-nav a { position: relative; color: var(--text-2); text-decoration: none; font-weight: 500; font-size: .95rem; padding: var(--sp-2) var(--sp-3); border-radius: var(--r-md); transition: color .15s var(--ease); }
.site-nav a::after { content: ""; position: absolute; left: var(--sp-3); right: var(--sp-3); bottom: 3px; height: 1.5px; pointer-events: none; background: linear-gradient(90deg, transparent, var(--cyan) 30%, var(--violet) 70%, transparent); box-shadow: 0 0 6px -1px var(--halo-strong); transform: scaleX(0); transform-origin: 50% 50%; transition: transform .22s var(--ease); }
.site-nav a:hover { color: var(--text); text-decoration: none; }
.site-nav a:hover::after, .site-nav a:focus-visible::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav a[aria-current="page"] { color: var(--violet-text); }
.site-header__tools { display: flex; gap: var(--sp-2); align-items: center; margin-left: auto; }
.site-nav + .site-header__tools { margin-left: 0; }
.site-header__tools .btn { white-space: nowrap; }
.nav-toggle { display: none; }
@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  /* The menu is a tonal sheet under the header; its rows are hairlines. */
  .site-nav { position: absolute; inset: 64px 0 auto 0; flex-direction: column; gap: 0; display: none; background: var(--surface); border-radius: 0 0 var(--r-lg) var(--r-lg); padding: var(--sp-1) var(--sp-4) var(--sp-3); box-shadow: var(--shadow-1); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: var(--sp-3) 0; border-top: 1px solid var(--line); }
  .site-nav a:first-child { border-top: 0; }
  .site-nav a::after { left: 0; right: 0; bottom: 0; }
  .site-nav a:hover { text-decoration: none; color: var(--text); }
}

/* Footer: the page ends on a planet's horizon. Its body is a dome of the raised night tone; the limb is lit by a thin
   atmosphere (cyan at the edge, violet above it) as if the sun sat just behind the planet. Subject links carry their orb
   and their domain hue; the base row names Aporia Systems. */
.site-footer { position: relative; isolation: isolate; overflow: hidden; margin-top: var(--sp-7); padding-block: 190px var(--sp-5); }
.site-footer::before { content: ""; position: absolute; z-index: -1; left: -30%; right: -30%; top: 110px; bottom: 0; border-radius: 50% 50% 0 0 / 150px 150px 0 0;
  background-image: radial-gradient(42% 220px at 50% 0, color-mix(in srgb, var(--cyan) 9%, transparent), transparent), radial-gradient(70% 360px at 50% 0, color-mix(in srgb, var(--violet) 12%, transparent), transparent), var(--stardust), linear-gradient(180deg, var(--bg-raised), var(--bg));
  background-size: auto, auto, 180px 180px, auto; background-repeat: no-repeat, no-repeat, repeat, no-repeat;
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--cyan) 70%, transparent), inset 0 14px 28px -16px color-mix(in srgb, var(--cyan) 45%, transparent), 0 -10px 40px -14px color-mix(in srgb, var(--cyan) 45%, transparent), 0 -40px 90px -30px color-mix(in srgb, var(--violet) 50%, transparent); }
.site-footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: var(--sp-6); }
.site-footer .brand img, .site-footer .brand svg { width: 38px; height: 38px; }
.site-footer .eyebrow { font: 600 .85rem/1.3 var(--font-ui); color: var(--violet-text); margin-bottom: var(--sp-3); }
.site-footer__tag { max-width: 38ch; margin: var(--sp-3) 0 var(--sp-2); }
.site-footer__parent { margin: 0; color: var(--text-2); }
.site-footer ul.plain { gap: var(--sp-1); }
.site-footer ul.plain a { display: inline-flex; align-items: center; gap: var(--sp-2); min-height: 32px; padding: 0 var(--sp-2); margin-left: calc(-1 * var(--sp-2)); border-radius: var(--r-md); transition: color .15s var(--ease), background-color .15s var(--ease); }
.site-footer ul.plain a:hover { text-decoration: none; color: var(--text); background: color-mix(in srgb, var(--surface-2) 55%, transparent); }
.site-footer ul.plain a[data-dom] { color: var(--tint); }
.site-footer ul.plain a[data-dom]:hover { background: color-mix(in srgb, var(--tint) 12%, transparent); }
.site-footer ul.plain .orb { width: 16px; height: 16px; }
.site-footer__base { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: var(--sp-2) var(--sp-5); margin-top: var(--sp-7); padding-top: var(--sp-4); border-top: 1px solid var(--line); color: var(--text-3); font-size: .875rem; }
.site-footer__base p { margin: 0; }
.site-footer__base a { color: var(--accent-text); }
@media (max-width: 820px) { .site-footer__grid { grid-template-columns: 1fr 1fr; } .site-footer::before { border-radius: 50% 50% 0 0 / 70px 70px 0 0; } }
@media (max-width: 520px) { .site-footer__grid { grid-template-columns: minmax(0, 1fr); } }

/* Hero */
.hero { position: relative; }
.hero__grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: var(--sp-7); align-items: end; padding-block: var(--sp-8) var(--sp-6); }
.hero__copy { display: grid; gap: var(--sp-4); max-width: 760px; }
@media (max-width: 960px) { .hero__grid { grid-template-columns: minmax(0, 1fr); padding-top: var(--sp-6); } }
.hero h1 { margin: 0; max-width: 18ch; }
.hero__sub { font-size: 1.15rem; color: var(--text-2); max-width: 62ch; margin: 0; }
.hero__cta { margin-top: var(--sp-3); }
/* Sections */
.section { padding-block: var(--sp-8); }
.section--tight { padding-block: var(--sp-7); }
.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: var(--sp-7); align-items: start; }
@media (max-width: 900px) { .split { grid-template-columns: minmax(0, 1fr); gap: var(--sp-5); } }
@media (max-width: 640px) { .defrows > div { grid-template-columns: minmax(0, 1fr); gap: var(--sp-2); } }
@media (max-width: 720px) { .shelf { grid-template-columns: minmax(0, 1fr); } }

/* Subjects: one lit glass card per subject, headed by its galaxy (app/Http/Art/SubjectArt.php): every bright star is one of
   its courses, foundations near the core and research at the rim, bigger for more topics. The whole card is the link. */
.subjects { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--sp-4); margin-top: var(--sp-6); }
@media (max-width: 900px) { .subjects { grid-template-columns: minmax(0, 1fr); } }
.subject-card { position: relative; display: grid; align-content: start; gap: var(--sp-2); padding: var(--sp-2) var(--sp-2) var(--sp-5); border-radius: var(--r-lg);
  background-image: var(--stardust), linear-gradient(180deg, color-mix(in srgb, var(--tint) 14%, var(--glass-top)), color-mix(in srgb, var(--tint) 5%, var(--glass-bottom)));
  background-size: 180px 180px, auto; background-repeat: repeat, no-repeat;
  box-shadow: inset 0 1px 0 var(--glass-hi), inset 0 -1px 0 var(--glass-shade), var(--glass-shadow);
  transition: transform .22s var(--ease), box-shadow .25s var(--ease); }
.subject-card:hover { transform: translateY(-3px); box-shadow: inset 0 1px 0 var(--glass-hi), inset 0 -1px 0 var(--glass-shade), 0 0 14px -5px color-mix(in srgb, var(--tint) 70%, transparent), var(--glass-shadow); }
.subject-card:focus-within { outline: 2px solid var(--bone); outline-offset: 3px; }
.subject-card__sky { display: block; overflow: hidden; aspect-ratio: 400 / 220; margin-bottom: var(--sp-3); border-radius: var(--r-md);
  background-image: radial-gradient(60% 70% at 50% 50%, color-mix(in srgb, var(--tint) 14%, transparent), transparent 70%), var(--stardust), linear-gradient(180deg, color-mix(in srgb, var(--tint) 6%, var(--bg-raised)), var(--bg));
  background-size: auto, 180px 180px, auto; background-repeat: no-repeat, repeat, no-repeat;
  box-shadow: inset 0 2px 14px var(--glass-shade), inset 0 -1px 0 color-mix(in srgb, var(--tint) 30%, transparent); transition: filter .3s var(--ease); }
.subject-card:hover .subject-card__sky { filter: brightness(1.2) saturate(1.1); }
.sgalaxy { display: block; width: 100%; height: 100%; }
.sgalaxy .sg-disc { fill: var(--tint); fill-opacity: .12; filter: blur(10px); }
.sgalaxy .sg-disc--wide { fill-opacity: .06; filter: blur(18px); }
.sgalaxy .sg-arm { fill: none; stroke: var(--tint); stroke-opacity: .2; stroke-width: 12; stroke-linecap: round; filter: blur(5px); }
.sgalaxy .sg-dust { fill: color-mix(in srgb, var(--tint), var(--bone) 45%); }
.sgalaxy .sg-core--outer { fill: var(--tint); fill-opacity: .3; filter: blur(9px); }
.sgalaxy .sg-core { fill: color-mix(in srgb, var(--tint), var(--bone) 60%); fill-opacity: .75; filter: blur(4px); }
.sgalaxy .sg-nucleus { fill: var(--bone); filter: drop-shadow(0 0 6px var(--bone)); }
.sgalaxy .sg-glow { fill: var(--tint); fill-opacity: .28; filter: blur(2px); }
.sgalaxy .sg-star { fill: var(--bone); }
.sgalaxy .sg-spike { stroke: var(--bone); stroke-opacity: .6; stroke-width: .7; }
.subject-card h2 { display: flex; align-items: center; gap: var(--sp-3); margin: 0; padding-inline: var(--sp-3); font-size: 1.6rem; }
.subject-card h2 a { color: var(--tint); text-decoration: none; }
.subject-card h2 a::after { content: ""; position: absolute; inset: 0; border-radius: var(--r-lg); }
.subject-card h2 a:focus-visible { outline: none; }
.subject-card__go { margin-left: auto; width: 30px; height: 30px; transition: transform .22s var(--ease); }
.subject-card__go .art { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.subject-card:hover .subject-card__go { transform: translateX(3px); }
.subject-card p { margin: 0; padding-inline: var(--sp-3); }
.subject-card .nums { font: 500 .85rem/1.4 var(--font-ui); color: var(--text-3); }

/* The landing's subject tiles (templates/pages/landing.php) still use these. */
.subject { background: var(--surface); border-radius: var(--r-lg); padding: var(--sp-5); display: grid; gap: var(--sp-2); align-content: start; }
.subject h2, .subject h3 { font-size: 1.5rem; margin: 0; }
.subject h2 a { color: var(--text); text-decoration: none; } .subject h2 a:hover { text-decoration: underline; }
.subject[data-dom="mth"] h2 a { color: var(--dom-mth); } .subject[data-dom="phy"] h2 a { color: var(--dom-phy); } .subject[data-dom="aiml"] h2 a { color: var(--dom-aiml); }
.subject .nums { font: 500 .85rem/1.4 var(--font-ui); color: var(--text-3); margin: 0; }
.subject ul { margin: var(--sp-2) 0 0; color: var(--text-2); font-size: .95rem; }

.pricing-paid { margin: var(--sp-4) 0 0; }
.pricing-how { padding-block: var(--sp-7) var(--sp-8); }
.pricing-how h2 { margin-top: 0; }
.pricing-how ul { list-style: none; padding: 0; margin: 0; }
.pricing-how li { padding: var(--sp-3) 0; border-top: 1px solid var(--line); color: var(--text-2); }

/* Content pages */
.prose { max-width: var(--measure); }
.crumbs { display: flex; flex-wrap: wrap; gap: var(--sp-2); padding-top: var(--sp-5); font: 500 .85rem/1.3 var(--font-ui); color: var(--text-3); }
.crumbs a { color: var(--text-3); text-decoration: none; } .crumbs a:hover { color: var(--text); text-decoration: underline; }
.crumbs > * + *::before { content: "/"; margin-right: var(--sp-2); color: var(--text-3); }


/* Goal picker above the route atlas */
@media (prefers-reduced-motion: reduce) { .atlas svg .node, .atlas svg .edge { transition: none; } }


/* Key to the planet encodings (the same glyphs the workspace uses): a tonal panel. */

/* The landing hero is always a night sky; its header shares that surface in the light theme too. */

/* Header CTA never wraps; on very narrow screens the header tightens instead: the wordmark gives way to the mark,
   so [theme] [lang] [sign in] [sign up] or [Dashboard] [profile] and the menu all fit on a 390px phone. */
@media (max-width: 480px) {
  .site-header__row { gap: var(--sp-2); }
  .site-header__tools { gap: var(--sp-1); }
  .site-header__tools .btn-sm { padding-inline: var(--sp-2); font-size: .82rem; }
  .site-header__tools .btn-sm svg { width: 15px; height: 15px; }
  .site-header .brand span { display: none; }
}