/* Paper / Forest design. Load after site.css and the home-only artwork styles. */
:root {
  color-scheme: light;
  --paper: #f7fbf7;
  --surface: #ffffff;
  --surface-soft: #edf4ee;
  --surface-hover: #e2eee4;
  --ink: #173d32;
  --ink-soft: #52695d;
  --biro: #23644d;
  --teal: #23644d;
  --teal-pale: #e2eee4;
  --grid: #d4e2d7;
  --border-hover: #8eb49a;
  --highlighter: #e2eee4;
  --solid: #23644d;
  --on-solid: #ffffff;
  --shadow: 0 5px 18px #173d3206;
  --radius: 12px;
  --text-hero: clamp(1.875rem, 1.2rem + 2vw, 2.625rem);
  --text-2xl: clamp(1.875rem, 1.2rem + 2vw, 2.625rem);
  --focus: 3px solid var(--biro);
}
html[data-theme="forest"] {
  color-scheme: dark;
  --paper: #071e18;
  --surface: #102c23;
  --surface-soft: #183a2d;
  --surface-hover: #214b39;
  --ink: #ffffff;
  --ink-soft: #b5cbbb;
  --biro: #b6e3bd;
  --teal: #b6e3bd;
  --teal-pale: #183a2d;
  --grid: #2c4c3b;
  --border-hover: #729d7e;
  --highlighter: #214b39;
  --solid: #b6e3bd;
  --on-solid: #102c23;
  --shadow: 0 5px 18px #00000010;
}
body { min-height: 100svh; }
.wrap { width: min(1152px, calc(100% - 80px)); padding-inline: 0; }
h1, h2, h3, .site-header__name { color: var(--ink); letter-spacing: -.025em; }
h1 { text-wrap: balance; line-height: 1.15; }
a { text-decoration-thickness: 1px; }
button, input, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
:focus-visible { outline: var(--focus); outline-offset: 4px; }
.site-header, .site-footer { background: var(--paper); border-color: var(--grid); }
.site-header__inner { min-height: 88px; padding-block: 16px; gap: 16px 24px; }
.site-header__name { font-size: 30px; gap: 11px; padding: 0; }
.site-header__mark { width: 52px; height: auto; fill: currentColor; }
.site-header__name:hover { text-decoration: none; opacity: .8; }
.site-nav { gap: 26px; font-size: 15px; }
.site-nav a { font-size: inherit; font-weight: 400; white-space: nowrap; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-underline-offset: 6px; }
.site-footer__inner { justify-content: space-between; align-items: center; padding-block: 24px; gap: 12px 24px; }
.site-footer__tools { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; }
.site-footer p, .site-footer__links { margin: 0; }
.site-footer a { color: var(--ink-soft); }
.tmm-field { position: relative; isolation: isolate; --field-paper: var(--paper); --field-ink: var(--ink); --field-accent: var(--teal); color: var(--ink); }
.tmm-field[data-field-theme="forest"] { --field-paper: var(--paper); --field-ink: var(--ink); --field-accent: #a7e4ad; }
.static-field { background: radial-gradient(ellipse 640px 430px at 100% 0%, color-mix(in srgb, var(--surface-hover) 55%, transparent), transparent), var(--paper); }
.appearance-row { position: absolute; inset: 22px 0 auto; display: flex; justify-content: flex-end; align-items: center; gap: 10px; pointer-events: none; z-index: 2; }
.appearance-row > * { pointer-events: auto; }
.theme-switch { display: inline-flex; padding: 4px; gap: 2px; border: 1px solid var(--grid); border-radius: 100px; background: var(--surface-soft); }
.theme-switch button { color: var(--ink-soft); border: 0; background: transparent; border-radius: 100px; font-size: 13px; line-height: 1.2; padding: 6px 12px; min-height: 30px; }
.theme-switch button[aria-pressed="true"] { background: var(--solid); color: var(--on-solid); }
.theme-switch button:hover:not([aria-pressed="true"]) { background: var(--surface-hover); color: var(--ink); }
.tmm-field__motion { width: 42px; height: 42px; color: var(--ink); border: 1px solid var(--grid); background: var(--surface-soft); }
.tmm-field__motion:hover { background: var(--surface-hover); }
.page, .hero--inner { padding-top: 30px; padding-bottom: 90px; }
.breadcrumbs { min-height: 34px; margin: 0 0 36px; font-size: 14px; line-height: 1.6; }
.breadcrumbs a { color: var(--ink-soft); text-decoration: none; }
.breadcrumbs a:hover { color: var(--ink); text-decoration: underline; }
.breadcrumbs > span[aria-hidden] { margin-inline: 7px; opacity: .6; }
.hero--inner .breadcrumbs { margin-bottom: 52px; }
.hero--inner .hero__title {
  max-width: 960px;
  min-height: 112px;
  margin: 0 0 32px;
  /* Shared title slot keeps every qualification chooser at the same vertical position. */
}
.home-field .hero { padding: 342px 0 44px; }
.home-field .hero__title { text-align: center; margin-bottom: 32px; }
.home-field .choose__note { text-align: center; font-size: 14px; }
.tmm-field__canvas { height: 780px; }
.choose { grid-template-columns: repeat(auto-fit, minmax(225px, 1fr)); gap: 18px; }
.choose__card { border: 1px solid var(--grid); border-radius: 16px; padding: 24px; background: var(--surface); color: var(--ink); box-shadow: var(--shadow); min-width: 0; }
.choose__title { font-size: 23px; line-height: 1.2; margin: 0 0 24px; }
.choose__boards { display: grid; gap: 8px; }
.choose__boards a { display: flex; align-items: center; justify-content: space-between; gap: 14px; font-size: 17px; line-height: 1.25; font-weight: 400; min-height: 46px; padding: 12px 14px; background: var(--surface-soft); color: var(--ink); border: 1px solid transparent; border-radius: 9px; text-decoration: none; }
.choose__boards a::after { content: "↗"; font-size: 20px; font-weight: 400; flex: none; }
.choose__boards a:hover, .choose__boards a:focus-visible { background: var(--surface-hover); border-color: var(--border-hover); }
.choose__card--link { position: relative; display: flex; flex-direction: column; min-height: 204px; text-decoration: none; }
.choose__card--link::after { content: "↗"; display: grid; place-items: center; width: 38px; height: 38px; margin-top: auto; align-self: flex-end; border: 1px solid var(--grid); border-radius: 50%; font-size: 24px; line-height: 1; background: var(--surface-soft); color: var(--ink); }
.choose__card--link .choose__title { margin: 0 0 20px; }
.choose__card--link:hover, .choose__card--link:focus-visible { background: var(--surface-hover); border-color: var(--border-hover); }
.choose__card--link:hover .choose__title { text-decoration: none; }
.choose__card--link:hover::after { color: var(--on-solid); background: var(--solid); border-color: var(--solid); }
.choose__card--other p { font-size: 15px; line-height: 1.6; margin: 0 0 20px; }
.hub-notes { max-width: 540px; margin-top: 38px; }
.hub-notes h2 { font-size: 20px; margin-bottom: 16px; }
.hub-notes .choose__boards { list-style: none; }
.page > h1 { max-width: 980px; margin-bottom: 28px; }
.spec-code { white-space: nowrap; font-size: .7em; }
.board-bar { gap: 16px 22px; margin: 0 0 28px; }
.board-bar__note { font-size: 15px; }
.board-bar__note a { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 16px; border: 1px solid var(--grid); border-radius: 10px; background: var(--surface); color: var(--ink); line-height: 1.4; text-decoration: none; }
.board-bar__note a:hover, .board-bar__note a:focus-visible { background: var(--surface-hover); border-color: var(--border-hover); }
.board-bar__count { padding-top: 4px; }
.switch { padding: 4px; gap: 4px; border: 1px solid var(--grid); border-radius: 100px; background: var(--surface-soft); flex-wrap: wrap; }
.switch a { min-width: 0; padding: 8px 17px; border: 0; border-radius: 100px; font-size: 15px; }
.switch a + a { border: 0; }
.switch a[aria-current="page"] { background: var(--solid); color: var(--on-solid); }
.switch a:not([aria-current]):hover { background: var(--surface-hover); }
.switch a:focus-visible { outline: var(--focus); outline-offset: -2px; }
.paper-grid-scroll { border: 1px solid var(--grid); border-radius: 16px; background: var(--surface); }
.paper-grid { border-collapse: separate; border-spacing: 0; }
.paper-grid th, .paper-grid td { padding: 22px 18px; border-color: var(--grid); }
.paper-grid thead th { padding-block: 16px; border-bottom: 1px solid var(--grid); color: var(--ink-soft); background: var(--surface-soft); font-size: 14px; font-weight: 400; }
.paper-grid tbody th { font-size: 18px; }
.paper-grid tbody th a { text-decoration: none; }
.paper-grid tbody th a:hover { text-decoration: underline; }
.paper-grid tbody tr:last-child > * { border-bottom: 0; }
.is-newest th a { background: none; margin: 0; padding: 0; }
.newest-tag { width: fit-content; margin-top: 9px; padding: 3px 9px; color: var(--biro); background: var(--surface-soft); border-radius: 30px; font-size: 12px; line-height: 1.4; }
.doc-links { gap: 7px; }
.doc-link { display: inline-flex; align-items: center; padding: 9px 12px; min-height: 42px; border: 1px solid var(--grid); border-radius: 9px; background: var(--surface-soft); color: var(--ink); font-size: 14px; line-height: 1.4; text-decoration: none; }
.doc-link:hover, .doc-link:focus-visible { border-color: var(--border-hover); background: var(--surface-hover); }
.series-paper { padding: 22px; border: 1px solid var(--grid); border-radius: 14px; background: var(--surface); margin-bottom: 12px; }
.series-paper h3 { margin: 0; }
.page > .board-bar__formulae { margin-bottom: 24px; }
.series-nav a { padding: 10px 16px; border: 1px solid var(--grid); border-radius: 10px; background: var(--surface); text-decoration: none; }
.series-nav a:hover { background: var(--surface-hover); border-color: var(--border-hover); }
.strand h2 { font-size: 23px; padding-bottom: 16px; margin-top: 40px; border-bottom: 1px solid var(--grid); }
.strand h2.strand__heading { padding: 0; border: 0; }
.strand-toggle { display: flex; align-items: center; justify-content: flex-start; gap: 12px; width: 100%; min-height: 58px; padding: 8px 0 16px; border: 0; border-bottom: 1px solid var(--grid); background: transparent; color: var(--ink); font: inherit; line-height: 1.3; letter-spacing: inherit; text-align: left; }
.strand-toggle__icon { display: grid; place-items: center; flex: 0 0 32px; height: 32px; border: 1px solid var(--grid); border-radius: 50%; background: var(--surface-soft); }
.strand-toggle__icon::before { content: ""; width: 8px; height: 8px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: translateY(-2px) rotate(45deg); }
.strand-toggle[aria-expanded="false"] .strand-toggle__icon::before { transform: translateX(-2px) rotate(-45deg); }
.strand-toggle:hover { color: var(--biro); border-color: var(--border-hover); }
.strand-toggle:hover .strand-toggle__icon { background: var(--surface-hover); border-color: var(--border-hover); }
.sheet { align-items: center; margin: 0 0 10px; padding: 20px 22px; border: 1px solid var(--grid); border-radius: 12px; background: var(--surface); }
.sheet:hover, .sheet:focus-within { background: var(--surface); border-color: var(--border-hover); }
.sheet__name a { text-decoration: none; }
.sheet__name a:hover { text-decoration: underline; }
.sheet__meta { font-size: 14px; }
/* A practice topic has one destination: the whole bubble is a native link. */
.sheet.sheet--topic { padding: 0; }
.sheet__topic { display: block; width: 100%; min-width: 0; padding: 20px 22px; border-radius: inherit; color: var(--ink); text-decoration: none; }
.sheet__topic:hover { text-decoration: none; }
.sheet__title { font-weight: 700; }
.sheet--topic:hover, .sheet--topic:focus-within { background: var(--surface-hover); border-color: var(--border-hover); }
/* Keep all resource lists compact, while giving titles and grade badges the full
   space remaining beside the buttons rather than a fixed narrow column. */
.sheets, .mock-set { max-width: 760px; }
.page:has(.sheets) .controls { width: 100%; max-width: 760px; }
.sheet:not(:has(> .doc-links)) { grid-template-columns: minmax(0, 1fr); }
.sheet:has(> .doc-links) { grid-template-columns: minmax(0, 1fr) auto; gap: 16px 24px; }
.sheet:has(> .doc-links) .sheet__name { min-width: 0; }
.sheet:has(> .doc-links) .sheet__meta { display: block; margin: 5px 0 0; }
.sheet:has(> .doc-links) > .doc-links { justify-content: flex-start; }
@media (max-width: 760px) {
  .sheet:has(> .doc-links) { grid-template-columns: minmax(0, 1fr); gap: 14px; }
}
.tag, .tier-tag { font-size: 12px; padding: 3px 8px; border-color: var(--grid); background: var(--surface-soft); border-radius: 30px; vertical-align: .1em; }
.controls { padding: 22px; border-radius: 14px; background: var(--surface); gap: 16px; }
.controls select, .controls input, .answer__input { border: 1px solid var(--grid); border-radius: 9px; background: var(--paper); }
.controls[data-focus-method="pointer"] select { outline: none; border-color: var(--grid); }
.controls__field { min-width: 0; }
.controls__field--search { flex: 0 1 320px; width: 320px; max-width: 100%; }
.jump__list a { display: block; padding: 8px 14px; border: 1px solid var(--grid); border-radius: 9px; background: var(--surface); text-decoration: none; color: var(--ink); }
.jump__list a:hover { background: var(--surface-hover); border-color: var(--border-hover); }
/* Equal-sized question links fit 1–15 inside the reading column on desktop.
   Challenge questions always begin a fresh row, using their actual level. */
.jump__list { display: grid; grid-template-columns: repeat(5, 44px); gap: 8px 6px; }
.jump__list a { display: grid; place-items: center; width: 44px; min-height: 44px; padding: 8px 0; }
.jump__list > li:not(:has(> .jump__challenge)) + li:has(> .jump__challenge) { grid-column-start: 1; }
.jump__list a.is-done { background: var(--surface-hover); border-color: var(--border-hover); }
.jump__list a[aria-current="true"], .jump__list a[aria-current="true"]:hover { background: var(--solid); border-color: var(--solid); color: var(--on-solid); }
.question__prev, .question__next { min-height: 44px; padding: 10px 20px; border: 1px solid var(--grid); border-radius: 10px; background: var(--surface-soft); color: var(--ink); line-height: 1.4; font-weight: 700; text-decoration: none; }
.question__next { background: var(--solid); border-color: var(--solid); color: var(--on-solid); }
.question__prev:hover, .question__next:hover { text-decoration: none; filter: brightness(.92); }
@media (min-width: 600px) {
  .jump__list { grid-template-columns: repeat(10, 44px); }
}
@media (min-width: 820px) {
  .jump__list { grid-template-columns: repeat(15, 44px); }
}
.button, .answer .button, .example__next { min-height: 44px; padding: 10px 20px; border: 1px solid var(--grid); border-radius: 10px; background: var(--surface-soft); color: var(--ink); line-height: 1.4; font-weight: 700; text-decoration: none; }
.button:first-child, .answer .button, .example__next { background: var(--solid); border-color: var(--solid); color: var(--on-solid); }
.button:hover { text-decoration: none; filter: brightness(.92); }
.facts, .boundaries { padding: 24px; border: 1px solid var(--grid); border-radius: 12px; background: var(--surface); }
.boundaries { max-width: 100%; overflow-x: auto; }
.boundaries table { max-width: 100%; }
.reading { max-width: 760px; margin-inline: 0; }
.reading > h1 { margin-bottom: 24px; }
/* One shared origin for every topic resource, aligned with the site header.
   Keep the heading outside .notes so its generous reading line-height cannot
   change tab heights or move the content when switching resource. */
.topic-heading { line-height: 1.55; }
.topic-heading h1 { max-width: 760px; margin: 0 0 24px; }
.topic-heading .topic-bar { margin-bottom: 28px; }
.topic-heading .topic-bar a, .topic-heading .topic-bar span { display: flex; align-items: center; min-height: 44px; line-height: 1.4; }
.topic-content { width: 100%; max-width: 760px; margin-inline: 0; display: flow-root; }
.topic-content > :first-child { margin-top: 0; }
.topic-content .notice { max-width: none; line-height: 1.55; }
.topic-content .hero__lead { font-size: 19px; line-height: 1.7; color: var(--ink-soft); }
.topic-content .facts, .topic-content .buttons { max-width: none; }
.topic-content .facts { width: 100%; }
.topic-bar { border: 0; max-width: none; margin-bottom: 26px; }
.topic-bar ul { gap: 8px; }
.topic-bar a, .topic-bar span { padding: 8px 16px; border: 1px solid var(--grid); border-radius: 9px; background: var(--surface); font-size: 15px; margin-bottom: 0; }
.topic-bar [aria-current] { background: var(--solid); border-color: var(--solid); color: var(--on-solid); }
.topic-bar a:hover { background: var(--surface-hover); border-color: var(--border-hover); }
.notice { border: 1px solid var(--grid); background: var(--surface-soft); padding: 12px 16px; border-radius: 10px; }
.notes .hero__lead { font-size: 19px; color: var(--ink-soft); line-height: 1.7; }
.notes-section { margin-top: 42px; }
.notes-section__title { font-size: 25px; }
.example, .question { border: 1px solid var(--grid); border-radius: 16px; padding: 26px; background: var(--surface); box-shadow: var(--shadow); }
.example .notes-section__title { font-size: 22px; }
.example__question { padding-bottom: 12px; }
.example__controls { margin-top: 24px; }
.reveal { border-radius: 10px; background: var(--surface-soft); overflow: hidden; }
.reveal summary { padding: 13px 17px; }
.question__title { font-size: 22px; }
.question__diagram { background: #ffffff; color: #173d32; border-radius: 12px; padding: 14px; }
.question__diagram svg { margin-inline: auto; }
.graph--live { max-width: 100%; padding: 24px; border: 1px solid var(--grid); border-radius: 16px; background: var(--surface); }
.graph__plot { max-width: 440px; margin-inline: auto; background: var(--paper); }
.graph__sliders, .graph__facts, .graph__hint { max-width: 440px; margin-inline: auto; }
.listen__voice { background: var(--surface); color: var(--ink); border-color: var(--grid); }
.listen__voice[aria-pressed="true"] { background: var(--solid); color: var(--on-solid); }
.listen__button, .listen__section { color: var(--biro); }
.key { border-color: var(--grid); background: var(--surface-soft); border-radius: 8px; }
.practice-foot { border-top: 1px solid var(--grid); padding-top: 26px; }
.paper-grid--stacked { background: var(--paper); }
.paper-grid--stacked tbody { gap: 18px; }
.paper-grid--stacked tbody tr { background: var(--surface); border-radius: 14px; }
.paper-grid--stacked tbody th { border-bottom: 1px solid var(--grid); background: var(--surface-soft); }
.paper-grid--stacked .newest-tag { margin-top: 0; }
@media (prefers-reduced-motion: no-preference) {
  .choose__card, .choose__boards a, .doc-link, .theme-switch button { transition: background-color .16s ease, border-color .16s ease; }
}
@media (max-width: 1000px) {
  .wrap { width: calc(100% - 48px); }
  .choose { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-header__name { font-size: 27px; }
  .site-header__mark { width: 47px; }
  .sheet { grid-template-columns: 1fr; gap: 16px; }
}
@media (max-width: 704px) {
  .paper-grid-scroll { border: 0; background: transparent; overflow: visible; }
  .paper-grid tbody tr { border-radius: 14px; background: var(--surface); }
  .paper-grid tbody th { background: var(--surface-soft); border-bottom: 1px solid var(--grid); }
  .paper-grid th, .paper-grid td { padding: 18px; }
  .paper-grid td { grid-template-columns: minmax(90px, 32%) 1fr; gap: 12px; }
  .paper-grid .newest-tag { margin-top: 0; }
}
@media (max-width: 700px) {
  .site-header__inner { flex-direction: column; gap: 15px; padding-block: 20px; }
  .site-header__name { font-size: 28px; }
  .site-nav { gap: 28px; font-size: 14px; }
}
@media (max-width: 600px) {
  .wrap { width: calc(100% - 36px); }
  /* On a phone the header is just the linked site name (Ben, 9 Oct 2026): the three section links are
     hidden, since the home page and the breadcrumbs lead everywhere. */
  .site-header nav[aria-label="Main"] { display: none; }
  .site-header__inner { min-height: 0; }
  .appearance-row { top: 18px; }
  .page, .hero--inner { padding-bottom: 56px; }
  .breadcrumbs { margin-bottom: 26px; font-size: 13px; }
  .hero--inner .breadcrumbs { margin-bottom: 28px; }
  /* On a phone the title takes only the room it needs (no shared slot) and a single-link card is one row:
     title on the left, arrow on the right (Ben, 9 Oct 2026: less to scroll past). */
  .hero--inner .hero__title { min-height: 0; font-size: 30px; margin-bottom: 20px; }
  .choose { grid-template-columns: 1fr; gap: 12px; }
  .choose__card { padding: 18px 20px; }
  .choose__title { font-size: 20px; margin-bottom: 14px; }
  .choose__card--link { min-height: 0; }
  .choose__card--link:not(.choose__card--other) { flex-direction: row; align-items: center; justify-content: space-between; gap: 14px; }
  .choose__card--link:not(.choose__card--other) .choose__title { margin: 0; }
  .choose__card--link::after { margin-top: 0; flex-shrink: 0; width: 34px; height: 34px; font-size: 21px; }
  /* On the home page the cards sit two across, so a single-link card is as tall as its neighbour:
     its title stays at the top and the arrow at the bottom right (Ben, 9 Oct 2026). */
  .home-field .choose__card--link:not(.choose__card--other) { align-items: flex-start; }
  .home-field .choose__card--link:not(.choose__card--other)::after { align-self: flex-end; }
  /* The "Other qualifications" card keeps its description under the title, with the arrow below. */
  .choose__card--other .choose__title { margin: 0 0 10px; }
  .choose__card--other p { margin: 0 0 14px; }
  .home-field .hero { padding: 266px 0 36px; }
  .home-field .hero__title { font-size: 30px; }
  .home-field .choose { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
  .home-field .choose__card { padding: 16px; }
  .home-field .choose__title { font-size: 20px; }
  .home-field .choose__boards a { font-size: 15px; padding: 10px; }
  .home-field .choose__boards a::after { font-size: 17px; }
  .home-field .choose__card--other p { font-size: 13px; }
  .tmm-field__canvas { height: 620px; }
  .site-footer__inner { font-size: 14px; }
  .sheet { padding: 20px; }
  .sheet__topic { padding: 20px; }
  .sheet__meta { margin: 6px 0 0; }
  .sheet__tags:empty { display: none; }
  .controls { padding: 18px; }
  .controls__field { flex: 1 1 120px; }
  .controls__field--search { flex-basis: 100%; }
  .topic-bar a, .topic-bar span { padding: 8px 11px; font-size: 14px; }
  .example, .question { padding: 20px 16px; }
  .graph--live { padding: 18px 12px; }
  .reading { font-size: 16px; }
  .series-paper { padding: 20px; }
}
@media (max-width: 380px) {
  .site-header__name { font-size: 25px; }
  .site-header__mark { width: 42px; }
  .site-nav { gap: 18px; font-size: 13px; }
  .home-field .choose { grid-template-columns: 1fr; }
  .home-field .choose__card { padding: 22px; }
}
@media (forced-colors: active) {
  .static-field { background: Canvas; }
  .theme-switch button[aria-pressed="true"], .topic-bar [aria-current] { outline: 2px solid ButtonText; }
}