/* The STEM home (index.html at the root). Same parts as the subject homes:
   a hero with one live instrument, subject cards with a real graph each,
   the three steps with examples from a real lesson, and a closing band.
   Cards, facts and Fig. 0 are filled in by landing.js. */

/* ---------- Hero ---------- */
.st-hero { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 64px; align-items: start; padding-top: 88px; padding-bottom: 104px; }
.st-hero-copy { padding-top: 24px; }
.st-hero h1 { font-size: clamp(44px, 5.2vw, 76px); line-height: 1.02; margin: 22px 0 24px; }
.st-hero h1 em, .st-head h2 em, .st-method h2 em, .st-closing h2 em { color: var(--blue); }
.st-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 20px 28px; margin-top: 34px; }
.st-facts { display: grid; grid-template-columns: repeat(3, auto); justify-content: start; margin-top: 60px; border-top: 1px solid var(--line); }
.st-facts div { display: flex; flex-direction: column; padding: 16px 32px 0 0; margin-right: 32px; border-right: 1px solid var(--line); }
.st-facts div:last-child { border: 0; margin: 0; }
.st-facts dt { font-size: 12.5px; color: var(--ink-3); white-space: nowrap; }
.st-facts dd { order: -1; font-size: 34px; line-height: 1.1; }

/* Fig. 0 — the instrument */
.st-inst { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.st-inst-head { display: flex; justify-content: space-between; align-items: center; padding: 13px 18px; border-bottom: 1px solid var(--line); font-size: 13.5px; font-weight: 500; }
.st-inst-head .eyebrow { margin-right: 8px; }
.st-inst canvas { display: block; width: 100%; height: 300px; }
.st-inst-ctl { padding: 10px 18px; border-top: 1px solid var(--line); }
.st-ctl { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 14px; font-size: 13px; color: var(--ink-2); }
.st-ctl .range { --rc: var(--c-temp); }
.st-ctl output { font-size: 12.5px; color: var(--ink-3); min-width: 60px; text-align: right; }
.st-ctl output b { font-weight: 500; color: var(--ink); }
.st-read { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.st-read div { padding: 11px 18px 12px; border-right: 1px solid var(--line); min-width: 0; }
.st-read div:last-child { border: 0; }
.st-read dt { font: italic 400 14px var(--font-display); color: var(--ink-3); }
.st-read dd { font: 12px var(--font-mono); color: var(--ink-3); white-space: nowrap; }
.st-read b { font: 500 19px var(--font-mono); color: var(--ink); letter-spacing: -0.02em; margin-right: 2px; }
.st-work { display: grid; gap: 2px; padding: 9px 18px 11px; border-top: 1px solid var(--line); background: var(--bg-2); font: 12.5px var(--font-mono); color: var(--ink-2); }
.st-work a { display: grid; grid-template-columns: 96px 1fr; padding: 2px 0; }
.st-work .w-k { color: var(--ink-3); }
.st-work a:hover span:last-child { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Subjects ---------- */
.st-band { padding: 104px 0 112px; background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); scroll-margin-top: var(--header-h); }
.st-head { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 64px; align-items: end; padding-bottom: 32px; margin-bottom: 36px; border-bottom: 1px solid var(--line-2); }
.st-head h2, .st-method h2 { font-size: clamp(36px, 4.2vw, 54px); line-height: 1.04; margin-top: 14px; }
.st-aside { color: var(--ink-2); max-width: 34em; }
.st-aside b { color: var(--ink); font-weight: 500; }
.st-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }

.subject { display: flex; flex-direction: column; padding: 24px 28px 24px; background: var(--raised); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); transition: border-color .15s; }
.subject:hover { border-color: var(--line-2); }
.subject-top { display: flex; align-items: baseline; gap: 14px; }
.subject-top .num { font-size: 12px; color: var(--ink); }
.subject-top .status { margin-left: auto; white-space: nowrap; }
.subject-top .eyebrow { min-width: 0; }
.subject h3 { font-size: clamp(38px, 3.6vw, 52px); line-height: 1; margin: 18px 0 8px; }
.subject h3 a:hover { font-style: italic; }
.subject-hint { color: var(--ink-2); }
.subject-art { margin: 22px 0 4px; padding: 10px 12px 6px; border: 1px solid var(--line); border-radius: var(--radius-sm); background-color: var(--surface);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 20px 20px; background-position: -1px -1px; }
.st-art { display: block; width: 100%; height: auto; }
.subject-lessons { list-style: none; margin: 18px 0 22px; border-top: 1px solid var(--line); }
.subject-lessons a { display: grid; grid-template-columns: 32px 1fr auto; align-items: baseline; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.subject-lessons .num { font-size: 12px; color: var(--ink-3); }
.subject-lessons b { display: block; font-size: 15px; font-weight: 500; }
.subject-lessons small { font-size: 12.5px; color: var(--ink-3); }
.subject-lessons i { font: 11px var(--font-mono); font-style: normal; color: var(--ink-3); }
.subject-lessons a:hover b { text-decoration: underline; text-underline-offset: 3px; }
.subject-foot { margin-top: auto; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.subject-prog { flex: 1; max-width: 220px; display: grid; gap: 8px; }
.subject-prog .num { font-size: 12px; color: var(--ink-3); }

.st-later { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 28px; }
.st-later article { padding-top: 16px; border-top: 1px solid var(--ink-4); }
.st-later-m { display: flex; justify-content: space-between; align-items: center; }
.st-later-m .num { font-size: 12px; color: var(--ink-3); }
.st-later h3 { font-size: 16px; font-weight: 600; margin-top: 12px; }
.st-later p { font-size: 13.5px; color: var(--ink-3); }

/* ---------- How a topic works ---------- */
.st-method { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 64px; padding-top: 112px; padding-bottom: 120px; }
.st-method-intro { position: sticky; top: calc(var(--header-h) + 32px); align-self: start; }
.st-method-intro > p:last-child { color: var(--ink-2); margin-top: 18px; max-width: 26em; }
.st-steps { list-style: none; border-top: 1px solid var(--ink); }
.st-steps li { display: grid; grid-template-columns: 56px minmax(0, 1fr) minmax(0, 1fr); gap: 24px; padding: 28px 0 30px; border-bottom: 1px solid var(--line); }
.st-n { font-size: 30px; font-style: italic; line-height: 1; color: var(--ink-3); }
.st-steps h3 { font-size: 28px; line-height: 1.1; margin-bottom: 8px; }
.st-steps li > div > p { color: var(--ink-2); font-size: 14.5px; }
.st-eg { padding: 14px 16px; border-left: 1px solid var(--line-2); }
.st-quote { font: italic 400 16px/1.45 var(--font-display); color: var(--ink); margin-top: 6px; }
.st-quote b { font-weight: 500; }
.st-eg table { margin-top: 8px; border-collapse: collapse; font-size: 12.5px; }
.st-eg th { font: 500 11px var(--font-mono); color: var(--ink-3); text-align: left; padding: 3px 24px 5px 0; border-bottom: 1px solid var(--line); }
.st-eg td { padding: 4px 24px 0 0; color: var(--ink-2); }
.st-eg td:last-child { color: var(--ink); }
.st-chain { display: flex; flex-wrap: wrap; gap: 2px 0; margin-top: 8px; font-size: 13.5px; color: var(--ink-2); }
.st-chain span + span::before { content: "→"; margin: 0 8px; font-family: var(--font-mono); color: var(--ink-4); }
.st-chain span:first-child { color: var(--ink); font-weight: 500; }
.st-chain span:last-child { color: var(--ink); font-weight: 600; }

/* ---------- Closing ---------- */
.st-closing { background: var(--bg-2); border-top: 1px solid var(--line); }
.st-closing-in { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 64px; align-items: end; padding-top: 88px; padding-bottom: 88px; }
.st-closing h2 { font-size: clamp(36px, 4.4vw, 58px); line-height: 1.04; }
.st-closing p { color: var(--ink-2); }
.st-closing .st-actions { margin-top: 20px; }
.footer { border-top: 0; }

/* ---------- Small screens ---------- */
@media (max-width: 1080px) {
  .st-hero { grid-template-columns: minmax(0, 1fr); gap: 48px; padding-top: 56px; }
  .st-hero-copy { padding-top: 0; }
  .st-method { grid-template-columns: 1fr; gap: 32px; }
  .st-method-intro { position: static; }
  .subject { padding: 22px 20px; }
  .subject-foot { flex-direction: column; align-items: stretch; }
  .subject-prog { max-width: none; }
}
@media (max-width: 900px) { .st-grid, .st-later { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 720px) {
  .st-hero { padding-top: 40px; padding-bottom: 72px; }
  .st-facts { grid-template-columns: repeat(3, 1fr); margin-top: 44px; }
  .st-facts div { padding-right: 12px; margin-right: 12px; }
  .st-facts dd { font-size: 28px; }
  .st-facts dt { white-space: normal; font-size: 12px; }
  .st-inst canvas { height: 240px; }
  .st-inst-head, .st-inst-ctl, .st-work { padding-left: 14px; padding-right: 14px; }
  .st-ctl { gap: 10px; }
  .st-read div { padding: 10px 12px; }
  .st-read b { font-size: 16px; }
  .st-work a { grid-template-columns: 80px 1fr; }
  .st-band { padding: 72px 0 80px; }
  .st-head { grid-template-columns: 1fr; gap: 16px; }
  .st-grid { grid-template-columns: 1fr; }
  .subject-foot { flex-direction: column; align-items: stretch; }
  .subject-prog { max-width: none; }
  .st-later { grid-template-columns: 1fr; }
  .st-method { padding-top: 72px; padding-bottom: 80px; }
  .st-steps li { grid-template-columns: 36px minmax(0, 1fr); }
  .st-eg { grid-column: 2; }
  .st-closing-in { grid-template-columns: 1fr; gap: 20px; padding-top: 56px; padding-bottom: 56px; }
}