/* Bayyinli — public site styles. Logical properties throughout so RTL and LTR share one stylesheet. */
:root {
  --target-min: 44px;  /* AUDIT-UI1: the project's smallest touch target */
  --text-note: 14px;   /* SOURCE-STATUS1: small notes under a list item (a source's dated status) */
  --ink: #101B34;
  --ink-2: #36425C;
  --ink-3: #5E6D85;
  --line: #DCE2EE;   /* decorative dividers and card edges */
  --control-line: #808BA1;   /* boundaries of inputs, options and chips: 3:1 on surface, paper, bg and the board */
  --line-2: #E9EDF5;
  --surface: #FFFFFF;      /* the whiteboard and cards */
  --paper: #FCFAF5;        /* warm page background */
  --bg: #F2F4F9;           /* neutral fills, hovers */
  --blue: #284BFA;         /* marker blue: actions, focus, pen */
  --blue-2: #1E3BD6;
  --blue-tint: #E9EFFE;
  --orange: #FF7747;       /* insight orange: the dot, hints, teacher marks (not for small text) */
  --orange-ink: #B4461F;   /* orange that passes contrast for text */
  --orange-tint: #FFF0E9;
  --cyan: #7AD1FF;         /* fatha cyan: sparing secondary highlight */
  --red: #C0392B;
  --red-tint: #FBE7E4;
  --ok: #1e7a4c;
  --ok-tint: #e2f3e9;
  --guide: #CDD6E8;
  --guide-base: #FF9F7E;
  /* Brand type: Tajawal for headings and interface labels, Noto Sans Arabic for running text and letter models. */
  --font-display: "Tajawal", "Noto Sans Arabic", "Segoe UI", system-ui, -apple-system, "Geeza Pro", Tahoma, sans-serif;
  --font-ui: "Noto Sans Arabic", "Tajawal", "Segoe UI", system-ui, -apple-system, "Geeza Pro", Tahoma, sans-serif;
  --font-model: "Noto Sans Arabic", "Tajawal", "Segoe UI", "Geeza Pro", Tahoma, sans-serif;
  --radius: 16px;
  --radius-s: 12px;
  --shadow: 0 1px 2px rgba(16, 27, 52, .06), 0 12px 32px rgba(16, 27, 52, .08);
  --shadow-up: 0 -6px 18px rgba(16, 27, 52, .08);   /* bars pinned to the bottom of the screen */
  --gutter: clamp(16px, 4vw, 40px);
  --max: 1180px;
  --trace-chrome: 500px;   /* height around the tracing pad: header, title, tabs, feedback and actions */
  --model-size: clamp(64px, min(14vw, 13svh), 120px);
  --model-size-line: clamp(34px, min(7.5vw, 8svh), 60px);  /* a whole sentence in a question (EDU2) */
  /* Roles that change with the theme (DM1). "Document" surfaces never change: board paper, worksheet pages, QR codes. */
  --document: #FFFFFF;
  --on-accent: #FFFFFF;      /* text and icons on --blue, --red and --orange-ink fills */
  --inverse: #101B34;        /* small dark chips: toasts, the selection bar, notes over the board */
  --inverse-ink: #FFFFFF;
  --inverse-line: rgba(255, 255, 255, .3);
  --inverse-hover: rgba(255, 255, 255, .15);
  --focus: rgba(40, 75, 250, .5);
  --overlay: rgba(16, 27, 52, .5);
  --footer-bg: #101B34;
  --footer-ink: #C9D3EA;
  --footer-muted: #A9B6D0;
  --footer-head: #FFFFFF;
  --footer-line: rgba(255, 255, 255, .12);
  --done-mark: #9fe0bd;      /* the tick on a finished tracing tab, over --blue */
  --show-on-light: inline;   /* artwork drawn for one background: the header wordmarks */
  --show-on-dark: none;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
html[lang="ar"] body { font-size: 17px; line-height: 1.85; }
img, svg, canvas { display: block; max-width: 100%; }
a { color: var(--blue); text-underline-offset: 3px; }
a:hover { color: var(--blue-2); }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.25; margin: 0 0 .5em; font-weight: 700; letter-spacing: -0.015em; }
h1 { font-weight: 800; }
html[lang="ar"] h1, html[lang="ar"] h2, html[lang="ar"] h3 { letter-spacing: 0; line-height: 1.4; }
p { margin: 0 0 1em; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 6px; }
button, input, select, textarea { font: inherit; color: inherit; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; inset-inline-start: 12px; top: -60px; background: var(--inverse); color: var(--inverse-ink); padding: 8px 14px; border-radius: var(--radius-s); z-index: 100; }
.skip-link:focus { top: 12px; color: var(--inverse-ink); }
.container { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }
.ar { font-family: var(--font-model); direction: rtl; unicode-bidi: isolate; }
.muted { color: var(--ink-3); }
[hidden] { display: none !important; }

/* Buttons and fields ------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 46px; padding: 10px 20px; border-radius: var(--radius-s);
  border: 1px solid transparent; background: var(--surface); color: var(--ink);
  font-family: var(--font-display); font-weight: 700; font-size: 15px; line-height: 1.2; text-decoration: none; cursor: pointer;
  transition: background-color .15s, border-color .15s, color .15s;
  white-space: nowrap;
}
.btn svg { width: 20px; height: 20px; flex: none; }
.btn-primary { background: var(--blue); color: var(--on-accent); box-shadow: 0 1px 0 rgba(16, 27, 52, .08); }
.btn-primary:hover { background: var(--blue-2); color: var(--on-accent); }
.btn-secondary { border-color: var(--control-line); background: var(--surface); color: var(--ink); }
.btn-secondary:hover { border-color: var(--ink-3); color: var(--ink); }
.btn-ghost { background: transparent; color: var(--ink-2); }
.btn-ghost:hover { background: var(--bg); color: var(--ink); }
.btn-danger { border-color: var(--red-tint); background: var(--surface); color: var(--red); }
.btn-danger:hover { background: var(--red-tint); color: var(--red); }
/* The confirming button of a destructive action (AUDIT-FIX 4): a filled red, never the primary blue */
.btn-danger-strong { border-color: var(--red); background: var(--red); color: var(--on-accent); box-shadow: 0 1px 0 rgba(16, 27, 52, .08); }
.btn-danger-strong:hover { filter: brightness(.92); color: var(--on-accent); }
.btn-small { min-height: 38px; padding: 6px 14px; font-size: 14px; }
.btn-large { min-height: 54px; padding: 12px 24px; font-size: 16px; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .45; cursor: not-allowed; }
.input, .select, .textarea {
  width: 100%; min-height: 46px; padding: 10px 12px; border: 1px solid var(--control-line); border-radius: var(--radius-s);
  background: var(--surface); color: var(--ink);
}
.textarea { min-height: 96px; resize: vertical; }
/* iOS zooms the page when a field under 16px gets focus. */
@media (max-width: 760px) { .input, .select, .textarea { font-size: 16px; } }
.input:focus, .select:focus, .textarea:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-tint); }
.label { display: block; font-family: var(--font-display); font-weight: 700; font-size: 15px; margin-bottom: 6px; color: var(--ink-2); }
.hint { font-size: 13px; color: var(--ink-3); margin-top: 6px; }
.code-input { font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; letter-spacing: .18em; text-transform: uppercase; direction: ltr; text-align: center; font-weight: 700; }

/* Header -------------------------------------------------------------------- */
.site-header { border-bottom: 1px solid var(--line); background: var(--surface); position: relative; z-index: 20; }
.site-header .container { display: flex; align-items: center; gap: 24px; min-height: 76px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; flex: none; }
.brand img { display: block; height: auto; }
.brand-mark { width: 40px; }
.brand-word-ar { width: 86px; margin-inline-start: -4px; }
.brand-navbar { width: min(220px, 42vw); }
.brand:hover { color: var(--ink); }
.site-nav { display: flex; align-items: center; gap: 4px; margin-inline-start: 12px; }
.site-nav a { font-family: var(--font-display); color: var(--ink-2); text-decoration: none; padding: 8px 12px; border-radius: var(--radius-s); font-weight: 500; font-size: 16px; }
.site-nav a:hover { background: var(--bg); color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--blue); background: var(--blue-tint); }
.header-end { margin-inline-start: auto; display: flex; align-items: center; gap: 8px; }
.lang-switch { position: relative; }
.lang-switch summary { list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; padding: 8px 10px; border-radius: var(--radius-s); color: var(--ink-2); font-family: var(--font-display); font-size: 15px; font-weight: 500; min-height: 40px; }
.lang-switch summary::-webkit-details-marker { display: none; }
.lang-switch summary:hover { background: var(--bg); }
.lang-switch svg { width: 18px; height: 18px; }
.lang-menu { position: absolute; inset-inline-end: 0; top: calc(100% + 6px); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 6px; min-width: 160px; display: grid; }
.lang-menu a { padding: 9px 12px; border-radius: var(--radius-s); color: var(--ink); text-decoration: none; font-size: 15px; }
.lang-menu a:hover { background: var(--bg); }
.lang-menu a[aria-current="true"] { font-weight: 700; color: var(--blue); }
.menu-toggle { display: none; }

@media (max-width: 900px) {
  .site-nav { display: none; position: absolute; inset-inline: 0; top: 100%; background: var(--surface); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; padding: 8px var(--gutter) 16px; margin: 0; box-shadow: var(--shadow); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px; font-size: 16px; }
  .menu-toggle { display: inline-flex; min-block-size: 44px; min-inline-size: 44px; justify-content: center; }
  .lang-switch summary { min-block-size: 44px; }
  .lang-menu a { min-block-size: 44px; display: flex; align-items: center; }
  .brand { min-block-size: 44px; }  /* touch targets in the header are at least 44 px */
  .header-join { display: none; }
  .site-header .container { gap: 12px; }
}

/* Footer ---------------------------------------------------------------------- */
.site-footer { background: var(--footer-bg); color: var(--footer-ink); margin-top: 72px; padding: 52px 0 32px; font-size: 15px; }
.footer-logo { width: 260px; height: auto; display: block; margin-bottom: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(4, 1fr); gap: 32px; }
.footer-grid h2 { font-size: 16px; margin-bottom: 12px; color: var(--footer-head); }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.footer-grid a { color: var(--footer-ink); text-decoration: none; }
.footer-grid a:hover { color: var(--footer-head); text-decoration: underline; }
.footer-about p { color: var(--footer-muted); max-width: 38ch; }
.footer-base { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--footer-line); color: var(--footer-muted); font-size: 14px; display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr 1fr; } .footer-about { grid-column: 1 / -1; }
  /* AUDIT-FIX 6: footer navigation is a list of touch targets, 44 px high, not running text */
  .footer-grid ul { gap: 0; }
  .footer-grid li a, .footer-grid li .footer-report { display: inline-flex; align-items: center; min-block-size: var(--target-min); min-inline-size: var(--target-min); }  /* AUDIT-UI1: Report a bug too */
}

/* Home: hero ---------------------------------------------------------------------- */
.hero { padding: clamp(32px, 6vw, 72px) 0 clamp(40px, 6vw, 80px); }
.hero .container { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 64px); align-items: center; }
.hero h1 { font-size: clamp(32px, 4.6vw, 54px); margin-bottom: 18px; }
html[lang="ar"] .hero h1 { font-size: clamp(34px, 4.6vw, 56px); }
.hero-lead { font-size: clamp(17px, 1.6vw, 19px); color: var(--ink-2); max-width: 46ch; margin-bottom: 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.join-inline { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 12px; padding-top: 22px; border-top: 1px solid var(--line-2); max-width: 520px; }
.join-inline label { font-weight: 600; color: var(--ink-2); font-size: 15px; }
.join-inline .join-row { display: flex; gap: 8px; flex: 1 1 260px; }
.join-inline .input { max-width: 190px; }
.form-error { color: var(--red); font-size: 14px; width: 100%; margin: 0; }
@media (max-width: 900px) { .hero .container { grid-template-columns: 1fr; } }
@media (max-width: 520px) { .hero-actions .btn { flex: 1 1 100%; } .join-inline .input { max-width: none; } }

/* Copybook tracing card (the signature element) */
.trace-card { background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: 0 27px 65px rgba(16, 27, 52, .12); overflow: hidden; }
.trace-card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding: 16px 20px 0; }
.trace-card-head h2 { font-size: 17px; margin: 0; }
.trace-card-head p { margin: 0; font-size: 14px; color: var(--ink-3); }
.copybook { position: relative; margin: 12px 20px 0; border-radius: 8px; background: var(--document); touch-action: none; aspect-ratio: 16 / 9; }
.copybook canvas { position: absolute; inset: 0; width: 100%; height: 100%; touch-action: none; cursor: crosshair; }
.trace-card-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 14px 20px 18px; }
.letter-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { min-width: 44px; min-height: 44px; display: inline-grid; place-items: center; border: 1px solid var(--control-line); background: var(--surface); border-radius: var(--radius-s); font-family: var(--font-model); font-size: 22px; line-height: 1; cursor: pointer; padding: 0 8px; color: var(--ink); }
.chip:hover { border-color: var(--blue); }
.chip[aria-pressed="true"] { background: var(--blue); border-color: var(--blue); color: var(--on-accent); }
/* Letter pickers: one native radio group (arrow keys move the choice), styled as chips. */
.chip-radio { position: relative; }
.chip-radio input { position: absolute; inset: -1px; margin: 0; opacity: 0; cursor: pointer; }  /* covers the border too: the whole 44 px chip */
.chip-radio:has(input:checked) { background: var(--blue); border-color: var(--blue); color: var(--on-accent); }
.chip-radio:has(input:focus-visible) { outline: 3px solid var(--blue); outline-offset: 2px; }
.trace-meter { margin-inline-start: auto; font-size: 14px; color: var(--ink-3); }
.trace-meter strong { color: var(--ok); }

/* Home: sections -------------------------------------------------------------- */
.section { padding: clamp(40px, 6vw, 72px) 0; }
.section-alt { background: var(--surface); border-block: 1px solid var(--line); }
.section-head { max-width: 60ch; margin-bottom: 32px; }
.section-head h2 { font-size: clamp(25px, 3vw, 34px); }
.section-head p { color: var(--ink-2); font-size: 17px; margin: 0; }
.steps { list-style: none; margin: 0 0 40px; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; border-top: 2px solid var(--ink); }
.steps li { padding: 20px 20px 4px 0; counter-increment: step; }
html[dir="rtl"] .steps li { padding: 20px 0 4px 20px; }
.steps li::before { content: counter(step); display: block; font-family: var(--font-display); font-weight: 800; font-size: 17px; color: var(--blue); margin-bottom: 8px; font-variant-numeric: tabular-nums; }
.steps h3 { font-size: 18px; margin-bottom: 6px; }
.steps p { color: var(--ink-2); font-size: 15px; margin: 0; }
@media (max-width: 860px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }
.shot { margin: 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); background: var(--surface); }
.shot img { width: 100%; height: auto; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 64px); align-items: start; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }

.activity-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 32px; }
.activity-list li { border-top: 1px solid var(--line); }
.activity-list a { display: grid; grid-template-columns: 56px 1fr; gap: 16px; align-items: center; padding: 16px 0; color: var(--ink); text-decoration: none; }
.activity-list a:hover h3 { color: var(--blue); text-decoration: underline; }
.activity-glyph { width: 56px; height: 56px; display: grid; place-items: center; background: var(--blue-tint); color: var(--blue); border-radius: var(--radius); font-family: var(--font-model); font-size: 28px; line-height: 1; }
.activity-list h3 { font-size: 17px; margin: 0 0 2px; }
.activity-list p { margin: 0; color: var(--ink-3); font-size: 15px; line-height: 1.5; }
@media (max-width: 700px) { .activity-list { grid-template-columns: 1fr; } }

.ws-sample { background: var(--surface); border: 1px solid var(--line); border-radius: 4px; box-shadow: var(--shadow); padding: 18px 20px; max-width: 420px; min-width: 0; overflow: hidden; }
.ws-sample .row { position: relative; height: 70px; border-bottom: 1.5px solid var(--guide-base); display: flex; align-items: flex-end; gap: clamp(10px, 4vw, 22px); justify-content: flex-start; padding-inline: 4px; }
.ws-sample .row::before { content: ""; position: absolute; inset-inline: 0; top: 18px; border-top: 1px dashed var(--guide); }
.ws-sample .model { font-family: var(--font-model); font-size: 46px; line-height: 1.25; color: var(--ink); }
.ws-sample .trace { font-family: var(--font-model); font-size: 46px; line-height: 1.25; color: transparent; -webkit-text-stroke: 1.2px #8592AA; }

.learn-links { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 32px; }
.learn-links a { display: block; padding: 14px 0; border-bottom: 1px solid var(--line); text-decoration: none; color: var(--ink); }
.learn-links strong { display: block; font-size: 17px; }
.learn-links span { color: var(--ink-3); font-size: 15px; }
.learn-links a:hover strong { color: var(--blue); text-decoration: underline; }
@media (max-width: 700px) { .learn-links { grid-template-columns: 1fr; } }
.audience { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.audience li { padding-inline-start: 22px; position: relative; color: var(--ink-2); }
.audience li::before { content: ""; position: absolute; inset-inline-start: 2px; top: .7em; width: 8px; height: 8px; border-radius: 50%; background: var(--orange); }
.keyboard-note { margin-top: 24px; padding: 14px 16px; background: var(--blue-tint); border-radius: var(--radius-s); font-size: 15px; color: var(--ink-2); }

/* Generic page heading ------------------------------------------------------------ */
.page-head { padding: clamp(28px, 5vw, 56px) 0 24px; }
.page-head h1 { font-size: clamp(28px, 3.6vw, 42px); margin-bottom: 10px; }
.page-head p { color: var(--ink-2); font-size: 18px; max-width: 60ch; margin: 0; }
.crumbs { font-size: 14px; color: var(--ink-3); margin-bottom: 12px; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.crumbs li + li::before { content: "/"; margin-inline-end: 6px; color: var(--line); }
.crumbs a { color: var(--ink-3); }

/* Practice hub ------------------------------------------------------------------- */
.practice-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.practice-grid a { display: flex; flex-direction: column; gap: 10px; height: 100%; padding: 22px; border: 1px solid var(--line); border-radius: 22px; text-decoration: none; color: var(--ink); background: var(--surface); }
.practice-grid a:hover { border-color: var(--blue); }
.practice-grid h2, .practice-grid h3 { font-size: 19px; margin: 0; }
.practice-grid p { margin: 0; color: var(--ink-3); font-size: 15px; line-height: 1.55; }
.practice-grid .activity-glyph { width: 64px; height: 64px; font-size: 32px; }
@media (max-width: 900px) { .practice-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .practice-grid { grid-template-columns: 1fr; } .practice-grid a { flex-direction: row; align-items: center; } .practice-grid .activity-glyph { flex: none; } }

/* Activity shell ------------------------------------------------------------------ */
.activity-shell { max-width: 820px; margin-inline: auto; }
/* Beginner's path: "start here" on /practice, then three steps. */
.start-path { margin-block: 0 32px; padding: clamp(18px, 3vw, 28px); border: 1px solid var(--line); border-radius: 22px; background: var(--surface); }
.start-path h2 { margin: 0 0 6px; }
.start-path p { color: var(--ink-2); margin: 0 0 14px; }
.start-form { display: grid; gap: 16px; justify-items: start; }
.start-form .letter-picker { justify-content: flex-start; margin: 0; }
.path-step { display: inline-block; margin: 0 0 8px; padding: 4px 12px; border-radius: var(--radius-s); background: var(--blue-tint); color: var(--blue); font-family: var(--font-display); font-weight: 700; font-size: 14px; }
.path-done { font-size: 18px; font-weight: 700; color: var(--ok); margin: 12px 0; }
.page-head-compact { padding-block: 16px 8px; }
.activity-shell > .muted { margin-block: 0 12px; }
.activity-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 16px; }
.activity-top h1 { font-size: clamp(24px, 3vw, 32px); margin: 0; }
.progress-text { color: var(--ink-3); font-size: 15px; font-variant-numeric: tabular-nums; }
.progress-bar { height: 6px; background: var(--line-2); border-radius: 3px; overflow: hidden; margin-bottom: 20px; }
.progress-bar span { display: block; height: 100%; background: var(--blue); width: 0; transition: width .25s; }
.stage { border: 1px solid var(--line); border-radius: 22px; background: var(--surface); padding: clamp(16px, 4vw, 32px); }
.prompt { font-size: 18px; font-weight: 600; margin: 0 0 18px; text-align: center; color: var(--ink-2); }
.big-ar { font-family: var(--font-model); font-size: var(--model-size); line-height: 1.6; text-align: center; margin: 0 0 12px; direction: rtl; color: var(--ink); }
.big-ar.is-line { font-size: var(--model-size-line); }
.big-ar .slot { display: inline-block; min-width: .9em; border-bottom: 4px solid var(--orange); color: var(--orange-ink); margin-inline: .02em; }
.sub-ar { text-align: center; color: var(--ink-3); margin: -6px 0 16px; font-size: 16px; }
.options { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; max-width: 560px; margin: 0 auto; }
.options.words { grid-template-columns: repeat(2, 1fr); }
.option { min-height: 76px; border: 2px solid var(--control-line); border-radius: var(--radius); background: var(--surface); font-family: var(--font-model); font-size: 40px; line-height: 1.2; cursor: pointer; color: var(--ink); padding: 6px; }
.option.small-text { font-family: var(--font-ui); font-size: 18px; font-weight: 600; min-height: 56px; }
.option:hover:not([disabled]) { border-color: var(--blue); }
.option.is-correct { border-color: var(--ok); background: var(--ok-tint); }
.option.is-wrong { border-color: var(--red); background: var(--red-tint); }
.option[disabled] { cursor: default; }
@media (max-width: 480px) { .options { grid-template-columns: repeat(2, 1fr); } .option { min-height: 68px; } }
.feedback { min-height: 32px; text-align: center; font-weight: 600; margin: 18px 0 0; }
.feedback.ok { color: var(--ok); }
.feedback.bad { color: var(--red); }
.stage-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 18px; }
.done { text-align: center; padding: 16px 0; }
.done h2 { font-size: 28px; }
.score-big { font-size: 48px; font-weight: 700; color: var(--blue); font-variant-numeric: tabular-nums; }

/* Tracing activity */
.tracer { position: relative; width: min(100%, calc((100svh - var(--trace-chrome)) * 16 / 9)); margin-inline: auto; aspect-ratio: 16 / 9; touch-action: none; border-radius: 8px; overflow: hidden; background: #fff; border: 1px solid var(--line-2); }
.tracer canvas { position: absolute; inset: 0; width: 100%; height: 100%; touch-action: none; }
.form-tabs { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 14px; }
.form-tab { border: 1px solid var(--control-line); background: var(--surface); border-radius: 999px; padding: 6px 14px; min-height: 40px; cursor: pointer; font-size: 15px; display: inline-flex; gap: 8px; align-items: center; color: var(--ink-2); }
.form-tab .ar { font-size: 22px; line-height: 1; }
.form-tab[aria-pressed="true"] { background: var(--blue); color: var(--on-accent); border-color: var(--blue); }
.form-tab.done-tab { border-color: var(--ok); }
.form-tab.done-tab::after { content: "✓"; color: var(--ok); font-weight: 700; }
.form-tab[aria-pressed="true"].done-tab::after { color: var(--done-mark); }
.letter-picker { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-top: 20px; }
.letter-picker .chip { min-width: 46px; }
.note { font-size: 14px; color: var(--ink-3); text-align: center; margin-top: 12px; }

/* Matching */
.match-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 560px; margin: 0 auto; }
.match-col { display: grid; gap: 10px; }
.match-item { min-height: clamp(52px, 7svh, 68px); border: 2px solid var(--control-line); border-radius: var(--radius); background: var(--surface); cursor: pointer; font-size: 36px; line-height: 1.2; color: var(--ink); }
.match-item.word { font-family: var(--font-model); font-size: 32px; }
.match-item[aria-pressed="true"] { border-color: var(--blue); background: var(--blue-tint); }
.match-item.matched { border-color: var(--ok); background: var(--ok-tint); opacity: .7; cursor: default; }
.match-item.shake { border-color: var(--red); background: var(--red-tint); }

/* Flashcards */
.flashcard { perspective: 1200px; max-width: 460px; margin: 0 auto; }
.flashcard-inner { position: relative; width: 100%; aspect-ratio: 4 / 3; transition: transform .45s; transform-style: preserve-3d; cursor: pointer; }
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face { position: absolute; inset: 0; backface-visibility: hidden; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 16px; box-shadow: var(--shadow); }
.flashcard-back { transform: rotateY(180deg); background: var(--blue-tint); }
.flashcard-face .big-ar { margin: 0; font-size: clamp(56px, 12vw, 88px); line-height: 1.5; }
.flash-pic { font-size: 64px; line-height: 1; }
.flash-meaning { font-size: 22px; font-weight: 600; }
.flash-letters { font-family: var(--font-model); font-size: 28px; direction: rtl; color: var(--ink-2); letter-spacing: .1em; }
@media (prefers-reduced-motion: reduce) { .flashcard-inner, .progress-bar span { transition: none; } }

/* Worksheets ------------------------------------------------------------------------ */
.ws-layout { display: grid; grid-template-columns: 340px minmax(0, 1fr); grid-template-rows: auto 1fr; gap: 28px; align-items: start; }  /* tall options grow the preview row, never the actions row */
.ws-controls { position: sticky; top: 16px; display: grid; gap: 18px; padding: 20px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); }
.ws-controls fieldset { border: 0; padding: 0; margin: 0; display: grid; gap: 8px; }
.ws-controls legend { font-weight: 600; font-size: 14px; color: var(--ink-2); margin-bottom: 6px; padding: 0; }
.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; inline-size: 100%; block-size: 100%; margin: 0; cursor: pointer; }
.seg span { display: inline-flex; align-items: center; min-height: 40px; padding: 6px 12px; border: 1px solid var(--control-line); border-radius: var(--radius-s); font-size: 14px; cursor: pointer; background: var(--surface); }
.seg input:checked + span { background: var(--blue); color: var(--on-accent); border-color: var(--blue); }
.seg input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.check { display: flex; align-items: center; gap: 10px; font-size: 15px; min-height: 36px; cursor: pointer; }
.check input { width: 20px; height: 20px; accent-color: var(--blue); }
.range-row { display: flex; align-items: center; gap: 10px; }
.range-row input { flex: 1; accent-color: var(--blue); }
.range-row output { min-width: 2ch; font-weight: 700; font-variant-numeric: tabular-nums; }
/* Print and PDF sit above the preview and stay in view: sticky at the top on wide screens, at the bottom on phones. */
.ws-controls { grid-row: 1 / span 2; }
.ws-actions { grid-column: 2; position: sticky; top: 16px; z-index: 2; display: flex; flex-wrap: wrap; gap: 8px; padding: 10px; border-radius: var(--radius); background: var(--paper); }
.ws-preview-wrap { grid-column: 2; }
.ws-more { border-block-start: 1px solid var(--line-2); padding-block-start: 12px; }
.ws-more summary { cursor: pointer; font-family: var(--font-display); font-weight: 600; color: var(--blue); min-height: 44px; display: flex; align-items: center; }
.ws-more-body { display: grid; gap: 18px; padding-block-start: 8px; }
.ws-preview-wrap { background: var(--bg); border-radius: 22px; padding: clamp(12px, 3vw, 28px); min-height: 400px; }
.ws-preview-meta { display: flex; justify-content: space-between; color: var(--ink-3); font-size: 14px; margin-bottom: 12px; }
.ws-preview { display: grid; gap: 20px; justify-items: center; }
.ws-unfit { max-width: 46ch; margin: 0; padding: 18px 20px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-s); color: var(--ink); line-height: 1.6; }
.ws-preview canvas, .ws-preview img { width: 100%; max-width: 640px; height: auto; background: var(--document); box-shadow: var(--shadow); }
.ws-letter-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px; }
.ws-letter-grid .chip { min-width: 0; width: 100%; font-size: 20px; min-height: 44px; }
@media (max-width: 900px) {
  .ws-layout { grid-template-columns: 1fr; grid-template-rows: none; }
  .ws-controls { position: static; grid-row: auto; }
  .ws-actions, .ws-preview-wrap { grid-column: auto; }
  .ws-actions { order: 1; top: auto; inset-block-end: 0; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto; margin-inline: calc(-1 * var(--gutter)); padding: 10px var(--gutter); border-radius: 0; box-shadow: var(--shadow-up); }
  .ws-actions .btn { padding-inline: 8px; font-size: 14px; white-space: normal; line-height: 1.2; }
  .ws-link-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  #ws-link { min-width: 46px; }
}

/* Print: only the generated pages */
.print-area { display: none; }
@media print {
  @page { size: A4; margin: 0; }
  body.printing > *:not(.print-area) { display: none !important; }
  body.printing .print-area { display: block; }
  .print-area img { width: 210mm; height: 297mm; page-break-after: always; break-after: page; display: block; }
}

/* Learn articles ------------------------------------------------------------------- */
.article { max-width: 72ch; }
.article h2 { font-size: 24px; margin-top: 40px; }
.article h3 { font-size: 19px; margin-top: 28px; }
.article p, .article li { color: var(--ink-2); font-size: 17px; }
html[lang="ar"] .article p, html[lang="ar"] .article li { font-size: 18px; }
.article ol, .article ul { padding-inline-start: 1.4em; }
.article li { margin-bottom: .4em; }
.article .ar-inline { font-family: var(--font-model); font-size: 1.25em; }
.example-ar { font-family: var(--font-model); font-size: 40px; line-height: 1.7; direction: rtl; text-align: center; padding: 12px; background: var(--bg); border-radius: var(--radius); margin: 16px 0; color: var(--ink); }
.table-wrap { overflow-x: auto; margin: 20px 0; border: 1px solid var(--line); border-radius: var(--radius); }
.letters-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.letters-table th, .letters-table td { padding: 8px 12px; border-bottom: 1px solid var(--line-2); text-align: center; vertical-align: middle; }
.letters-table th { background: var(--bg); font-family: var(--font-display); font-weight: 700; color: var(--ink-2); white-space: nowrap; }
.letters-table td.glyph { font-family: var(--font-model); font-size: 30px; line-height: 1.5; direction: rtl; }
.letters-table td.word { font-family: var(--font-model); font-size: 22px; direction: rtl; white-space: nowrap; }
.letters-table td.tr { direction: ltr; font-style: italic; color: var(--ink-2); min-width: 200px; text-align: start; }
.letters-table td.name { font-family: var(--font-model); font-size: 19px; }
.letters-table tr.nonjoin td.glyph:first-child { color: var(--red); }
.related { margin-top: 48px; padding: 20px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.related h2 { font-size: 17px; margin: 0; flex: 1 1 100%; }
.related .btn { max-width: 100%; white-space: normal; text-align: center; }
/* VISUAL-NOBARS (owner, 19 October): no coloured side stripes; a quiet tinted panel, even corners, the heading says what it is */
.callout { padding: 14px 18px; background: var(--orange-tint); border-radius: var(--radius-s); margin: 20px 0; }
.callout p:last-child { margin: 0; }

/* Join -------------------------------------------------------------------------------- */
.join-card { max-width: 460px; margin: 0 auto; padding: 28px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); }
.join-card form { display: grid; gap: 12px; }
.join-card .input { font-size: 26px; min-height: 60px; }
.join-card .hint { text-align: center; }

/* Toast (shared) */
.toast-region { position: fixed; inset-inline: 0; bottom: 20px; display: grid; justify-items: center; gap: 8px; z-index: 200; pointer-events: none; padding: 0 16px; }
.toast { pointer-events: auto; font-family: var(--font-display); background: var(--inverse); color: var(--inverse-ink); padding: 10px 16px; border-radius: var(--radius-s); box-shadow: 0 10px 30px rgba(0,0,0,.2); font-size: 15px; max-width: 520px; display: flex; gap: 12px; align-items: center; }
.toast button { background: transparent; border: 1px solid var(--inverse-line); color: var(--inverse-ink); border-radius: 4px; padding: 4px 10px; cursor: pointer; }
/* Contextual link to an online Arabic keyboard, only beside fields where people type Arabic. */
.kbd-help { font-size: 13px; color: var(--blue); white-space: nowrap; }

/* Teaching guide (TODAY item 6) ------------------------------------------------------------------ */
.guide-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 40px; }
.guide-step { display: grid; gap: 16px; align-items: start; }
@media (min-width: 900px) { .guide-step { grid-template-columns: minmax(260px, 1fr) 2fr; gap: 32px; } }
.guide-text h2 { display: flex; align-items: center; gap: 12px; font-size: 22px; margin-block-end: 8px; }
.guide-text p { margin: 0; color: var(--ink-2); line-height: 1.7; }
.guide-num { display: inline-grid; place-items: center; flex: none; inline-size: 36px; block-size: 36px; border-radius: 50%; background: var(--blue); color: var(--on-accent); font-size: 17px; }
/* VIDEO1-GUIDE: the walkthrough video, its caption box on a phone (outside fullscreen) and its transcript */
.guide-video { margin-block: 0 40px; display: grid; gap: 12px; }
.guide-video h2 { font-size: 22px; margin: 0; }
.guide-video > p { margin: 0; color: var(--ink-2); line-height: 1.7; }
.guide-video video { display: block; inline-size: 100%; block-size: auto; aspect-ratio: 16 / 9; border-radius: var(--radius); background: var(--inverse); box-shadow: var(--shadow); }
.guide-video .guide-video-cue { margin: 0; min-block-size: 4.8em; padding: 8px 12px; border-radius: var(--radius-s); background: var(--inverse); color: var(--inverse-ink); font-size: 17px; line-height: 1.6; }
.guide-video-transcript { padding: 12px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-s); }
.guide-video-transcript summary { cursor: pointer; font-weight: 700; min-block-size: var(--target-min); display: flex; align-items: center; }
.guide-video-transcript ol { margin: 8px 0 0; padding-inline-start: 20px; line-height: 1.8; color: var(--ink-2); }
.guide-shot { margin: 0; }
.guide-shot img { display: block; inline-size: 100%; block-size: auto; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); background: var(--surface); }
.guide-shot.phone img { max-inline-size: 300px; margin-inline: auto; }
.guide-keep { margin-block: 48px 24px; padding: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.guide-keep h2 { font-size: 22px; }
.guide-keep ul { margin: 0 0 12px; padding-inline-start: 20px; line-height: 1.8; }
/* BOARD-TEACH1: how to adapt an activity (anchored: /guide#adapt) */
.guide-adapt { margin-block: 48px 24px; display: grid; gap: 14px; scroll-margin-block-start: 80px; }
.guide-adapt h2 { font-size: 24px; }
.guide-adapt h3 { font-size: 19px; margin-block: 0 6px; }
.guide-adapt-steps, .guide-adapt-other { margin: 0; padding-inline-start: 22px; line-height: 1.8; }
.guide-further { color: var(--ink-2); }
.guide-cta { text-align: center; margin-block: 32px 48px; }
.steps-more { margin-block: 16px 0; text-align: center; }
.steps-more a { font-weight: 700; }

/* Phones: every control is a real 44 px touch target (TODAY final check) */
@media (max-width: 760px) {
  .btn-small { min-height: 44px; }
  .form-tab { min-height: 44px; }
  .crumbs a { display: inline-flex; align-items: center; justify-content: center; min-block-size: 44px; min-inline-size: 44px; }
  .seg label { display: inline-flex; }
  label.check { display: flex; align-items: center; min-block-size: 44px; }
  .seg span { min-block-size: 44px; min-inline-size: 44px; justify-content: center; }
  .skip-link { display: inline-flex; align-items: center; min-block-size: 44px; }
  input[type="range"] { min-block-size: 44px; }
}

/* Appearance (DM1) ----------------------------------------------------------------------------------
   Light is the default. Dark applies to screens only (never to print), either because the visitor chose it
   (html[data-theme="dark"], set before the first paint by /static/js/theme-boot.js) or because the system is dark
   and no choice is saved. The two dark blocks are identical; tests/test_contrast.py checks that and their contrast. */
@media screen and (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #E6EAF3;
    --ink-2: #C3CBDC;
    --ink-3: #9DA8BE;
    --line: #2B3650;
    --control-line: #7A89A8;
    --line-2: #1F283D;
    --surface: #161D2E;
    --paper: #0E1422;
    --bg: #1C2438;
    --blue: #8CA2FF;
    --blue-2: #A9BAFF;
    --blue-tint: #1E2A55;
    --orange: #FF8A5E;
    --orange-ink: #FFA585;
    --orange-tint: #3A2419;
    --cyan: #7AD1FF;
    --red: #FF8A7E;
    --red-tint: #3B1C1A;
    --ok: #6FD6A0;
    --ok-tint: #13301F;
    --guide: #3A4560;
    --guide-base: #C9755A;
    --on-accent: #0B1020;
    --inverse: #E6EAF3;
    --inverse-ink: #0B1020;
    --inverse-line: rgba(11, 16, 32, .3);
    --inverse-hover: rgba(11, 16, 32, .1);
    --focus: rgba(140, 162, 255, .7);
    --overlay: rgba(0, 0, 0, .6);
    --footer-bg: #070B14;
    --footer-ink: #C3CBDC;
    --footer-muted: #9DA8BE;
    --footer-head: #FFFFFF;
    --footer-line: rgba(255, 255, 255, .1);
    --done-mark: #0E5C35;
    --show-on-light: none;
    --show-on-dark: inline;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .35);
    --shadow-up: 0 -6px 18px rgba(0, 0, 0, .4);
    color-scheme: dark;
  }
}
@media screen {
  :root[data-theme="dark"] {
    --ink: #E6EAF3;
    --ink-2: #C3CBDC;
    --ink-3: #9DA8BE;
    --line: #2B3650;
    --control-line: #7A89A8;
    --line-2: #1F283D;
    --surface: #161D2E;
    --paper: #0E1422;
    --bg: #1C2438;
    --blue: #8CA2FF;
    --blue-2: #A9BAFF;
    --blue-tint: #1E2A55;
    --orange: #FF8A5E;
    --orange-ink: #FFA585;
    --orange-tint: #3A2419;
    --cyan: #7AD1FF;
    --red: #FF8A7E;
    --red-tint: #3B1C1A;
    --ok: #6FD6A0;
    --ok-tint: #13301F;
    --guide: #3A4560;
    --guide-base: #C9755A;
    --on-accent: #0B1020;
    --inverse: #E6EAF3;
    --inverse-ink: #0B1020;
    --inverse-line: rgba(11, 16, 32, .3);
    --inverse-hover: rgba(11, 16, 32, .1);
    --focus: rgba(140, 162, 255, .7);
    --overlay: rgba(0, 0, 0, .6);
    --footer-bg: #070B14;
    --footer-ink: #C3CBDC;
    --footer-muted: #9DA8BE;
    --footer-head: #FFFFFF;
    --footer-line: rgba(255, 255, 255, .1);
    --done-mark: #0E5C35;
    --show-on-light: none;
    --show-on-dark: inline;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .35);
    --shadow-up: 0 -6px 18px rgba(0, 0, 0, .4);
    color-scheme: dark;
  }
}
/* Documents keep their light ink in every theme: the tracing pad and the sample worksheet are paper. */
img.on-light { display: var(--show-on-light); }
img.on-dark { display: var(--show-on-dark); }
.dg-stage, .copybook, .tracer, .ws-sample, .sheet {
  --ink: #101B34;
  --ink-2: #36425C;
  --ink-3: #5E6D85;
  --line: #DCE2EE;   /* decorative dividers and card edges */
  --control-line: #808BA1;   /* boundaries of inputs, options and chips: 3:1 on surface, paper, bg and the board */
  --surface: #FFFFFF;      /* the whiteboard and cards */
  --guide: #CDD6E8;
  --guide-base: #FF9F7E;
  background: var(--document);
  color: var(--ink);
}

/* Appearance selector (DM1): the header menu reuses the language menu's look */
.theme-switch summary { justify-content: center; min-inline-size: 40px; }
.theme-menu button { padding: 9px 12px; border: 0; border-radius: var(--radius-s); background: transparent; color: var(--ink); font: inherit; font-size: 15px; text-align: start; cursor: pointer; min-block-size: 40px; }
.theme-menu button:hover { background: var(--bg); }
.theme-menu button[aria-pressed="true"] { font-weight: 700; color: var(--blue); }
@media (max-width: 760px) {
  .theme-switch summary { min-inline-size: 44px; }
  .theme-menu button { min-block-size: 44px; }
}
@media (max-width: 400px) {
  /* Very narrow phones: the language button keeps only its globe (its accessible name stays), making room for the appearance button */
  .lang-switch:not(.theme-switch) summary span { display: none; }
  .lang-switch summary { min-inline-size: 44px; justify-content: center; padding-inline: 8px; }
}

/* Worksheet studio (WS1) */
.ws-group { display: grid; gap: 10px; border: 0; padding: 0; margin: 0; }
.ws-group > legend { font-family: var(--font-display); font-weight: 700; color: var(--ink); margin-block-end: 4px; padding: 0; }
.ws-group[hidden], [data-for][hidden] { display: none; }
.preset-save { display: flex; gap: 8px; }
.preset-save .input { flex: 1; min-inline-size: 0; }
.preset-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.preset-row { display: flex; gap: 6px; flex-wrap: wrap; }
.preset-files { display: flex; gap: 8px; flex-wrap: wrap; }
.ws-preview-meta { align-items: center; flex-wrap: wrap; gap: 8px; }
.ws-zoom { display: inline-flex; align-items: center; gap: 4px; margin-inline-start: auto; }
.ws-zoom .btn { min-inline-size: 44px; justify-content: center; }
.ws-zoom output { min-inline-size: 4ch; text-align: center; font-variant-numeric: tabular-nums; }
.ws-preview canvas { max-width: calc(640px * var(--ws-zoom, 1)); }
.vmark-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(9em, 1fr)); gap: 0 10px; }

/* My words (worksheets) */
.mw-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.mw-row { display: grid; grid-template-columns: 40px minmax(0, 1fr) minmax(0, 1fr) auto; align-items: center; gap: 8px; }
.mw-thumb { inline-size: 40px; block-size: 40px; border-radius: var(--radius-s); background: var(--document); }
.mw-word { font-family: var(--font-model, inherit); font-size: 20px; }
.mw-meaning { color: var(--ink-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mw-add { display: grid; gap: 6px; }
.mw-photo { justify-self: start; }
.ws-kbd { margin-inline-start: 6px; }
@media print { .kbd { display: none !important; } }

/* PUB1: the publisher's address on the About, Contact and Terms pages */
/* PUB2: the publisher's details as plain text, aligned with the article: no border, card or accent */
.publisher { font-style: normal; line-height: 1.7; margin-block: 8px 16px; }
/* PUB2: a casual copy deterrent on the publisher and policy pages (static/js/protect.js). Email addresses stay selectable. */
[data-protect] { -webkit-user-select: none; user-select: none; }
[data-protect] a[href^="mailto:"] { -webkit-user-select: text; user-select: text; }
.contact-channels { padding-inline-start: 1.2em; }

/* HUR1: Hurayrah, the companion extension's pages (images served from /static/img/hurayrah) */
.hurayrah-page { max-inline-size: 860px; padding-block: 24px 48px; }
.hurayrah-page section { margin-block: 40px; }
.hur-hero h1 { margin-block: 12px 8px; }
.hur-mark { border-radius: var(--radius-s); }
.hur-hero .lead { font-size: 18px; color: var(--ink-2); }
.hur-status { padding-block: 10px; padding-inline: 14px; border-radius: var(--radius-s); background: var(--blue-tint); color: var(--ink); display: inline-block; }
.hur-shot { display: block; inline-size: 100%; block-size: auto; border-radius: var(--radius); border: 1px solid var(--line); margin-block: 16px; }
.hur-toc { padding-block: 8px; border-block: 1px solid var(--line); display: flex; flex-wrap: wrap; align-items: center; gap: 4px 12px; color: var(--ink-3); }
.hur-toc a { display: inline-flex; align-items: center; justify-content: center; min-block-size: 44px; min-inline-size: 44px; padding-inline: 4px; }
.hur-help dd p { margin: 0; }
.hur-help dt { font-family: var(--font-display); font-weight: 700; margin-block-start: 16px; }
.hur-help dd { margin-inline-start: 0; margin-block: 4px 0; color: var(--ink-2); }

/* ---------------------------------------------------------------------------------------------------------------
   EDU1: worksheet library and packs, lessons that teach, practice that explains
   --------------------------------------------------------------------------------------------------------------- */
.ws-jumps { display: flex; flex-wrap: wrap; gap: 8px; margin-block-start: 8px; }
.ws-jumps .btn { min-block-size: 44px; }
.ws-library { margin-block-end: 40px; }
.ws-library > p { color: var(--ink-2); max-inline-size: 60ch; }
.ws-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-block: 14px 18px; }
.ws-filters .chip { min-block-size: 44px; font-family: var(--font-display); font-size: 15px; font-weight: 700; padding-inline: 14px; }
.ws-direct .ws-library { display: none; }
.ws-editor-title { margin-block: 8px 16px; }
.ws-empty { color: var(--ink-2); }
.pack-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.pack-grid.compact { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.pack-card { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); overflow: hidden; }
.pack-card[hidden] { display: none; }
.pack-thumb { display: block; background: var(--paper); border-block-end: 1px solid var(--line); aspect-ratio: 480 / 340; overflow: hidden; }
.pack-thumb img { inline-size: 100%; block-size: auto; display: block; }
.pack-body { display: flex; flex-direction: column; gap: 8px; padding: 16px 18px 18px; flex: 1; }
.pack-body h3 { margin: 0; font-size: 18px; }
.pack-body h3 a { color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; min-block-size: 44px; min-inline-size: 44px; }
.pack-body h3 a:hover { color: var(--blue); text-decoration: underline; }
.pack-body p { margin: 0; color: var(--ink-2); font-size: 15px; }
.pack-skill { align-self: flex-start; font: 700 13px/1 var(--font-display); color: var(--blue); background: var(--blue-tint); padding: 6px 10px; border-radius: var(--radius-s); }
.pack-facts { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 13px; color: var(--ink-3); }
.pack-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-block-start: auto; padding-block-start: 6px; }
.pack-actions .btn { min-block-size: 44px; }
.sheet-grid { list-style: none; margin: 0 0 32px; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 18px; }
.sheet-card { display: flex; flex-direction: column; gap: 8px; }
.sheet-card img { inline-size: 100%; block-size: auto; border: 1px solid var(--line); border-radius: var(--radius-s); background: var(--paper); }
.sheet-card p { margin: 0; font-size: 14px; color: var(--ink-2); }
.sheet-card .btn { align-self: flex-start; min-block-size: 44px; }
.letter-sheets { list-style: none; margin: 12px 0 32px; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(56px, 1fr)); gap: 8px; }
.letter-sheets a { display: grid; place-items: center; min-block-size: 56px; border: 1px solid var(--line); border-radius: var(--radius-s); background: var(--surface); color: var(--ink); text-decoration: none; font: 500 28px/1 var(--font-model); }
.letter-sheets a:hover { border-color: var(--blue); color: var(--blue); }
.pack-use .related { margin-block-start: 12px; }

/* Lessons */
.lesson-step { font: 700 14px/1 var(--font-display); color: var(--orange-ink); margin-block-end: 10px; }
.lesson-frame { display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; max-inline-size: 820px; }
.lesson-frame > * { min-inline-size: 0; }
.lesson-facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin: 0; }
.lesson-facts > div { padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.lesson-facts dt { font: 700 13px/1.3 var(--font-display); color: var(--ink-3); margin-block-end: 4px; }
.lesson-facts dd { margin: 0; color: var(--ink); }
.lesson-facts dd a { display: inline-flex; align-items: center; min-block-size: 44px; min-inline-size: 44px; }
.worked { margin: 28px 0; padding: 20px; border-radius: 22px; background: var(--bg); }
.worked h2 { margin-block-start: 0; }
.worked-tiles { list-style: none; margin: 0 0 12px; padding: 0; display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.worked-tiles li { display: flex; flex-direction: column; align-items: center; gap: 6px; min-inline-size: 96px; padding: 12px 14px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); }
.worked-ar { font: 500 48px/1.6 var(--font-model); color: var(--ink); }
.worked-label { font-size: 13px; color: var(--ink-2); text-align: center; }
/* ARABIC2: a word joined and split, step by step (static/js/joindemo.js). Each piece is text the browser shapes; the
   space between the pieces narrows as they join (none once the word is whole), at once with reduced motion. */
.joindemo { --join-apart: 0.9em; --join-forms: 0.45em; --join-parts: 0.3em; --join-time: .45s;
  margin: 28px 0; padding: 20px; border-radius: 22px; background: var(--bg); }
.joindemo h2 { margin-block-start: 0; }
.joindemo-words { display: flex; flex-wrap: wrap; gap: 8px; margin-block: 12px; }
.joindemo-word { min-height: 44px; padding: 4px 14px; border: 1px solid var(--control-line); border-radius: var(--radius-s); background: var(--surface);
  color: var(--ink); font: 500 22px/1.4 var(--font-model); cursor: pointer; }
.joindemo-word[aria-pressed="true"] { border-color: var(--blue); background: var(--blue-tint); color: var(--blue); }
.joindemo-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; counter-reset: join; }
.joindemo-steps button { min-height: var(--target-min);  /* AUDIT-UI1 */ padding: 6px 12px; border: 0; border-radius: var(--radius-s); background: transparent; color: var(--ink-2);
  font-family: var(--font-display); font-size: 15px; cursor: pointer; }
.joindemo-steps button[aria-current="step"] { background: var(--surface); color: var(--ink); font-weight: 700; box-shadow: 0 0 0 1px var(--line); }
.joindemo-stage { display: flex; flex-wrap: wrap; justify-content: center; align-items: baseline; gap: var(--join-apart); min-block-size: 1.8em; margin-block: 16px;
  padding: 12px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); font: 500 64px/1.5 var(--font-model); color: var(--ink);
  transition: gap var(--join-time) ease; }
.joindemo-stage[data-state="forms"] { gap: var(--join-forms); }
.joindemo-stage[data-state="parts"] { gap: var(--join-parts); }
.joindemo-stage[data-state="word"] { gap: 0; }
.joindemo-explain { min-block-size: 3em; margin: 0 0 12px; color: var(--ink-2); }
.joindemo-nav, .joindemo-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.joindemo-actions { margin-block-start: 10px; }
@media (prefers-reduced-motion: reduce) { .joindemo-stage { transition: none; } }
@media (max-width: 480px) { .joindemo-stage { font-size: 48px; } }
.worked figcaption { color: var(--ink-2); text-align: center; }
.mistake { padding: 14px 18px; background: var(--red-tint); border-radius: var(--radius-s); }
.mistake h2 { font-size: 17px; margin-block: 0 6px; color: var(--ink); }
.mistake p { margin: 0; color: var(--ink); }
.tryit { padding: 20px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); }
.tryit h2 { margin-block-start: 0; }
.tryit-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-block-start: 14px; }
.tryit-actions .btn { min-block-size: 44px; }
.tracer-small { max-inline-size: 420px; margin-inline: auto; }
.teacher-note { padding: 14px 18px; border-radius: var(--radius); background: var(--blue-tint); }
.teacher-note h2 { font-size: 17px; margin-block: 0 6px; }
.teacher-note p { margin: 0; }
.lesson-next { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.lesson-next .btn { min-block-size: 44px; white-space: normal; }
.lesson-path { list-style: none; margin: 0 0 28px; padding: 0; display: grid; gap: 12px; counter-reset: step; max-inline-size: 820px; }
.lesson-path li { counter-increment: step; }
.lesson-path a { display: grid; grid-template-columns: 44px 1fr; gap: 4px 14px; align-items: start; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); text-decoration: none; color: var(--ink); }
.lesson-path a::before { content: counter(step); grid-row: span 2; display: grid; place-items: center; inline-size: 44px; block-size: 44px; border-radius: 50%; background: var(--blue-tint); color: var(--blue); font: 700 18px/1 var(--font-display); }
.lesson-path a:hover { border-color: var(--blue); }
.lesson-path strong { font-size: 17px; }
.lesson-path span { color: var(--ink-2); font-size: 15px; }
.lesson-continue { margin-block-end: 20px; }
.lesson-continue .btn, .tryit-actions .btn, .pack-actions .btn { white-space: normal; }
.lesson-continue[hidden] { display: none; }

/* Practice that explains */
.explain { margin-block: 12px; padding: 14px 16px; border-radius: var(--radius); background: var(--orange-tint); color: var(--ink); }
.explain[hidden] { display: none; }
.explain-text { margin-block: 0 8px; font-size: 16px; }
.review { margin-block: 16px; }
.review-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.review-list li { font: 500 28px/1.5 var(--font-model); padding: 4px 14px; border-radius: var(--radius-s); background: var(--bg); }
.next-steps { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-block: 16px; }
.next-steps h3 { flex-basis: 100%; text-align: center; font-size: 16px; margin: 0; }
.next-steps .btn, .done-actions .btn { white-space: normal; }
.done-actions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.q-pic { display: block; margin: 0 auto 8px; inline-size: 160px; block-size: 160px; }
.activity-about { margin-block: 28px; padding: 18px 20px; border-radius: 22px; background: var(--bg); }
.activity-about h2 { margin-block-start: 0; font-size: 19px; }
.activity-about .example-ar { background: var(--surface); }
.about-links a { font-weight: 600; display: inline-flex; align-items: center; min-block-size: 44px; min-inline-size: 44px; }
.skill-grid { list-style: none; margin: 0 0 28px; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }
.skill-card { display: flex; flex-direction: column; gap: 10px; padding: 20px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); }
.skill-card h2 { font-size: 19px; margin: 0; }
.skill-card p { margin: 0; color: var(--ink-2); font-size: 15px; }
.skill-example { font: 500 40px/1.5 var(--font-model); color: var(--ink); text-align: center; padding: 8px; border-radius: var(--radius); background: var(--bg); }
.skill-meta { font-size: 13px; color: var(--ink-3); }
.skill-modes { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 14px; }
.skill-modes a { display: inline-flex; align-items: center; min-block-size: 44px; min-inline-size: 44px; }
.skill-card .btn { align-self: flex-start; }
.practice-continue { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-block-end: 24px; padding: 14px 16px; border-radius: var(--radius); background: var(--blue-tint); }
.practice-continue[hidden] { display: none; }
.practice-continue p { margin: 0; flex-basis: 100%; font-size: 14px; color: var(--ink-2); }
.practice-continue .btn { min-block-size: 44px; white-space: normal; }
.start-more summary { cursor: pointer; min-block-size: 44px; display: flex; align-items: center; font-weight: 600; }
@media (max-width: 760px) {
  .worked-ar { font-size: 40px; }
  .pack-grid, .pack-grid.compact { grid-template-columns: 1fr; }
  .pack-card { flex-direction: row; }
  .pack-thumb { flex: 0 0 34%; aspect-ratio: auto; border-block-end: 0; border-inline-end: 1px solid var(--line); }
  .pack-body { padding: 12px 14px; }
  .pack-body p { display: none; }
}

/* EDU-FLOW: the practice catalogue (each exercise once, in its skill) and the worksheets' browse-to-edit views */
.practice-catalogue { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-block: 24px; }
.mode-list { list-style: none; margin: 8px 0; padding: 0; display: grid; gap: 10px; }
.mode-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 12px; padding: 12px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.mode-row .mode-text { flex: 1 1 12em; min-inline-size: 0; }
.mode-row h3 { margin: 0; font-size: 17px; }
.mode-row p { margin: 0; color: var(--ink-3); font-size: 14px; }
.mode-row .activity-glyph { width: 48px; height: 48px; font-size: 22px; flex: none; }
.mode-row .btn { min-block-size: 44px; }
.mode-option { display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--ink-2); }
.mode-option .pb-select { min-block-size: 44px; max-inline-size: 14em; }
@media (max-width: 760px) { .practice-catalogue { grid-template-columns: minmax(0, 1fr); } }
.ws-editor-area { display: none; }
body[data-ws-view="editor"] .ws-editor-area { display: block; }
body[data-ws-view="editor"] .ws-library, body[data-ws-view="editor"] .ws-jumps { display: none; }
.ws-editor-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin-block: 4px 12px; }
.ws-editor-head .ws-editor-title { margin: 0; flex: 1 1 14em; font-size: 22px; }
.ws-editor-head .btn { min-block-size: 44px; }
.ws-sheet-tabs { display: flex; flex-wrap: wrap; gap: 6px; flex-basis: 100%; }
.ws-sheet-tabs .chip { font-family: var(--font-display); font-size: 15px; font-weight: 700; padding-inline: 14px; min-block-size: 44px; }

/* SUBJECTS1: maths, chemistry and biology. The tool first, on a document-white working surface; then its outputs, then
   the notes (how to use it, worked examples, reference, sources) in an uneven two-column rhythm. Typography and spacing
   separate things; no coloured side bars. */
.nav-subjects { position: relative; }
.nav-subjects summary { font-family: var(--font-display); color: var(--ink-2); padding: 8px 12px; border-radius: var(--radius-s); font-weight: 500; font-size: 16px; }
.nav-subjects[data-current] summary { color: var(--blue); background: var(--blue-tint); }
.nav-subjects .lang-menu { inset-inline-start: 0; inset-inline-end: auto; min-inline-size: 190px; }
.nav-subjects .lang-menu a { font-family: var(--font-display); }
@media (max-width: 900px) {
  .nav-subjects .lang-menu { position: static; box-shadow: none; border: 0; padding-inline-start: 12px; }
  .nav-subjects summary { padding: 12px; }
}
.subject-page .page-head p, .subject-hub .page-head p { max-width: 68ch; }
.tool-panel { border: 1px solid var(--line); border-radius: 22px; background: var(--surface); padding: clamp(14px, 3vw, 28px); display: grid; gap: 24px; }
.tool-controls { display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: flex-start; }
.tool-field { min-inline-size: 0; margin: 0; padding: 0; border: 0; }
.tool-field legend { padding: 0; }
.tool-field-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; }
.tool-inline { display: inline-flex; align-items: center; gap: 8px; font-size: 15px; color: var(--ink-2); }
.tool-inline .pb-select { min-block-size: 44px; }
.tool-mini-actions { display: flex; flex-wrap: wrap; gap: 6px; margin-block-start: 8px; }
.tool-digits .seg span { font-size: 16px; min-block-size: 44px; }
.tt-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.tt-chips .chip { font-family: var(--font-display); font-size: 18px; font-weight: 700; font-variant-numeric: tabular-nums; }
.tool-views { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 28px 32px; }
.tool-view { min-inline-size: 0; }
.tool-view:first-child { grid-column: 1 / -1; }
.tool-view h2 { font-size: 22px; margin-block-end: 4px; }
.tool-view > .muted { margin-block-end: 12px; }
@media (max-width: 900px) { .tool-views { grid-template-columns: minmax(0, 1fr); } }
.tt-grid-wrap { overflow-x: auto; max-inline-size: 100%; padding-block-end: 4px; }
.tt-grid { border-collapse: collapse; font-family: var(--font-display); font-variant-numeric: tabular-nums; }
.tt-grid th, .tt-grid td { border: 1px solid var(--control-line); padding: 0; text-align: center; }
.tt-grid th { background: var(--blue-tint); color: var(--ink); font-size: 18px; inline-size: 2.6em; block-size: 2.6em; }
.tt-grid .tt-corner { color: var(--blue); }
.tt-cell { inline-size: 2.6em; block-size: 2.6em; border: 0; background: var(--surface); color: var(--ink); text-align: center; font: 600 18px var(--font-display); font-variant-numeric: tabular-nums; }
.tt-cell:focus { outline: 3px solid var(--focus); outline-offset: -3px; }
.tt-cell.is-correct { background: var(--ok-tint); color: var(--ok); }
.tt-cell.is-wrong { background: var(--red-tint); color: var(--red); }
.tt-array-wrap { background: var(--document); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px; display: grid; place-items: center; }
.tt-array-groups { font-weight: 600; margin-block: 12px 2px; }
.tt-expr, .typed-expr { font-family: var(--font-display); font-variant-numeric: tabular-nums; unicode-bidi: isolate; }
.tt-expr { font-size: 20px; margin-block: 2px; }
.tt-skip-line { display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; color: var(--ink-2); }
.tt-again-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.tt-again-list li { font-family: var(--font-display); padding: 4px 12px; border-radius: var(--radius-s); background: var(--bg); unicode-bidi: isolate; }
.typed-expr { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 12px; font-size: clamp(32px, 6vw, 48px); font-weight: 700; margin: 0 0 12px; }
.answer-input { inline-size: 3.6em; font-size: inherit; font-weight: 700; text-align: center; padding-block: 4px; }
.answer-input.is-correct { border-color: var(--ok); background: var(--ok-tint); }
.answer-input.is-wrong { border-color: var(--red); background: var(--red-tint); }
.answer-input.is-shown { border-color: var(--blue); }
.tt-why-array { margin-inline: auto; border-radius: var(--radius-s); background: var(--document); }
.tt-skip { text-align: center; font-family: var(--font-display); }
.tool-out { border-block-start: 1px solid var(--line); padding-block-start: 20px; }
.tool-out h2 { font-size: 20px; margin-block-end: 4px; }
.tool-out-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-block-start: 12px; }
.tool-out-actions .btn { white-space: normal; }
/* DIGITS1: a marked number or expression in the tools' text: isolated (its own direction) and never broken across lines */
bdi.dg { white-space: nowrap; }
.tool-out-for { margin-block: 8px 0; font-weight: 600; }
.tool-out-for:empty { display: none; }
.tool-notes { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 8px 48px; margin-block-start: 40px; }
.tool-notes section { min-inline-size: 0; }
.tool-notes h2 { font-size: 22px; }
.tool-notes h3 { font-size: 17px; margin-block-end: 4px; }
@media (max-width: 900px) { .tool-notes { grid-template-columns: minmax(0, 1fr); } }
.tool-steps, .tool-ref { padding-inline-start: 1.3em; display: grid; gap: 6px; }
.worked-example { margin-block-end: 18px; }
.worked-example p { margin: 0; }
.source-list { padding-inline-start: 1.3em; display: grid; gap: 6px; font-size: 15px; }
/* SOURCE-STATUS1: a dated note under a citation that could not be reached when checked */
.source-status { display: block; font-size: var(--text-note); color: var(--ink-3); }
.subject-related { margin-block: 40px 16px; }
.subject-related h2 { font-size: 18px; }
.subject-related ul { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 22px; }
.hub-list { list-style: none; padding: 0; margin: 8px 0 0; }
.hub-row { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 20px 32px; align-items: center; padding-block: 24px; border-block-end: 1px solid var(--line); }
.hub-row:nth-child(even) .hub-thumb { order: 2; }
.hub-thumb { display: block; background: var(--document); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px; }
.hub-text h2 { font-size: 24px; margin-block-end: 6px; }
.hub-text h2 a { color: var(--ink); text-decoration: none; }
.hub-text h2 a:hover { color: var(--blue); }
.hub-uses { color: var(--ink-3); font-size: 15px; }
@media (max-width: 760px) {
  .hub-row { grid-template-columns: minmax(0, 1fr); }
  .hub-row:nth-child(even) .hub-thumb { order: 0; }
}
.chip.chip-text { font-family: var(--font-display); font-size: 15px; font-weight: 700; padding-inline: 14px; }
/* SUBJECTS1: a labelled diagram. The drawing and its labels are a document (white in both themes); the labels sit on the
   drawing's own geometry, so the stage keeps a left-to-right coordinate system whatever the page's direction. */
.dg-layout { display: grid; gap: 14px; }
.dg-stage { position: relative; direction: ltr; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }  /* a document: light tokens above */
.dg-labels { position: absolute; inset: 0; pointer-events: none; }
.dg-label { position: absolute; pointer-events: auto; display: flex; align-items: center; gap: 6px; padding: 2px 8px; border: 1px solid var(--control-line); border-radius: var(--radius-s); background: var(--surface); color: var(--ink); font: 600 15px/1.25 var(--font-display); cursor: grab; touch-action: none; text-align: start; }
.dg-label.is-moved { z-index: 1; }
.dg-label[data-side="l"] { justify-content: flex-end; }
.dg-label:hover { border-color: var(--ink-2); }
.dg-label:focus-visible { outline: 3px solid var(--focus); outline-offset: 1px; }
.dg-label.is-hidden { border-style: dashed; color: var(--ink-2); }
.dg-n { flex: none; min-inline-size: 1.6em; block-size: 1.6em; display: inline-grid; place-items: center; border-radius: 50%; border: 1.5px solid var(--ink-2); font-size: 13px; color: var(--ink); }
.dg-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; }
.dg-list .dg-label { position: static; inline-size: 100%; min-block-size: 44px; justify-content: flex-start; cursor: pointer; }
.dg-info { min-block-size: 3.5em; }
.dg-info h3 { font-size: 18px; margin-block-end: 2px; }
.dg-info p { margin: 0; }
.dg-schematic { font-size: 14px; color: var(--ink-3); margin: 0; }
.dg-ref { margin: 0; display: grid; gap: 10px; }
.dg-ref-row dt { font-weight: 700; font-family: var(--font-display); }
.dg-ref-row dd { margin: 0; }
.big-plain { font: 700 28px/1.4 var(--font-display); text-align: center; margin: 0 0 12px; }
.question .q-pic[role="img"] { margin-inline: auto; background: var(--document); border-radius: var(--radius-s); }
.review-list li.plain { font: 600 18px/1.5 var(--font-display); }
/* SUBJECTS1: the periodic table. The grid keeps the conventional left-to-right layout in every language; on a narrow
   screen it scrolls inside its own box, cells keeping a 44 px touch size. */
.pt-selbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; }
.pt-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; }
.pt-scroll { overflow-x: auto; padding-block-end: 4px; }
.pt-grid { display: grid; grid-template-columns: repeat(18, minmax(44px, 1fr)); grid-template-rows: repeat(7, auto) 12px repeat(2, auto); gap: 3px; min-inline-size: 846px; direction: ltr; }
.pt-cell { display: grid; grid-template-rows: auto 1fr auto; justify-items: center; align-items: center; aspect-ratio: 1 / 1.08; min-block-size: 44px; padding: 3px 2px; border: 1px solid var(--control-line); border-radius: var(--radius-s); background: var(--surface); color: var(--ink); cursor: pointer; min-inline-size: 0; }
.pt-cell:hover { border-color: var(--blue); }
.pt-cell.is-out { opacity: .32; }
.pt-cell.is-selected { background: var(--blue-tint); border-color: var(--blue); border-width: 2px; }
.pt-cell.is-card { outline: 3px solid var(--blue); outline-offset: 1px; }
.pt-z { font-size: 10px; line-height: 1; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.pt-sym { font: 700 18px/1 var(--font-display); }
.pt-name { font-size: 9px; line-height: 1.2; max-inline-size: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--ink-2); }
.pt-place { display: grid; place-items: center; border: 1px dashed var(--control-line); border-radius: var(--radius-s); font-size: 10px; color: var(--ink-3); }
.pt-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; background: var(--surface); max-inline-size: 760px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 4px 24px; align-items: start; }
.pt-card > :not(.pt-facts) { grid-column: 1; }
.pt-card .pt-facts { grid-column: 2; grid-row: 1 / span 3; margin: 0; }
@media (max-width: 620px) { .pt-card { grid-template-columns: minmax(0, 1fr); } .pt-card .pt-facts { grid-column: 1; grid-row: auto; margin-block: 12px; } }
.pt-card-head { display: flex; gap: 14px; align-items: center; }
.pt-card-sym { font: 800 48px/1 var(--font-display); color: var(--blue); min-inline-size: 1.4em; text-align: center; }
.pt-card h3 { margin: 0; font-size: 20px; }
.pt-card .muted { margin: 2px 0 0; font-size: 14px; }
.pt-facts { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 12px 0; font-size: 15px; }
.pt-facts dt { color: var(--ink-3); }
.pt-facts dd { margin: 0; font-weight: 600; }
.pt-all { margin-block: 24px; }
.pt-all summary { cursor: pointer; font: 700 18px var(--font-display); min-block-size: 44px; display: flex; align-items: center; }
.pt-all-scroll { overflow-x: auto; }
.pt-table { border-collapse: collapse; font-size: 14px; min-inline-size: 640px; }
.pt-table th, .pt-table td { border-block-end: 1px solid var(--line); padding: 6px 10px; text-align: start; }
.pt-table th { font-family: var(--font-display); color: var(--ink-2); }
.subject-practice { margin-block: 32px 8px; }
.subject-practice h2 { font-size: 22px; }
.ws-subjects-title { font-size: 20px; margin-block: 32px 8px; }
.ws-subject-sheets .mode-row .btn { min-block-size: 44px; }
/* SUBJECTS1 batch B: fractions, number lines, place value and the clock. Each model is drawn on a document-white box;
   the place-value buttons sit under the chart's own columns, so they keep its left-to-right order (real geometry). */
.fr-wrap, .nl-wrap, .ck-wrap, .pv-wrap canvas { background: var(--document); border: 1px solid var(--line); border-radius: var(--radius); }
.fr-wrap, .nl-wrap { padding: 8px; display: grid; place-items: center; }
.fr-wrap canvas, .nl-wrap canvas, .ck-wrap canvas { touch-action: none; cursor: pointer; max-inline-size: 100%; }
.nl-from { inline-size: 7em; min-block-size: 44px; text-align: center; font-family: var(--font-display); font-variant-numeric: tabular-nums; }
.nl-markers { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-block-start: 12px; }
.nl-pins { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px 14px; }
.nl-pins li { display: inline-flex; align-items: center; gap: 4px; }
.nl-pin { min-block-size: 44px; min-inline-size: 56px; font-variant-numeric: tabular-nums; }
.nl-pin span { unicode-bidi: isolate; }
.pv-wrap { inline-size: fit-content; max-inline-size: 100%; display: grid; gap: 8px; }
.pv-buttons { display: grid; gap: 6px; align-items: start; direction: ltr; }
.pv-col { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px; }
.pv-col .btn { min-inline-size: 44px; }
.pv-readout { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; margin-block: 14px 0; font-size: 18px; }
.pv-readout b { font-size: 26px; }
.ck-layout { display: grid; grid-template-columns: minmax(0, 420px) minmax(0, 1fr); gap: 20px 32px; align-items: center; }
@media (max-width: 760px) { .ck-layout { grid-template-columns: minmax(0, 1fr); } }
.ck-wrap { padding: 8px; display: grid; place-items: center; max-inline-size: 440px; }
.ck-side { display: grid; gap: 10px; align-content: start; }
.ck-words { font: 700 clamp(22px, 3vw, 28px)/1.35 var(--font-display); margin: 0; }
.ck-digits { font-size: 32px; font-weight: 700; margin: 0; }
.ck-target { font: 700 24px/1.4 var(--font-display); margin-block: 4px 0; }
.dg-route { padding-inline-start: 1.3em; display: grid; gap: 4px; margin-block: 8px 10px; font-family: var(--font-display); font-weight: 600; }
/* SUBJECTS1 batch C: the equation writer and the plotter. Expressions are typed in a field that takes the notation's
   direction, drawn on a document-white box; the keys are a wrapping row of 44 px buttons. */
.eq-input { inline-size: 100%; max-inline-size: 640px; min-block-size: 48px; font: 500 22px/1.3 var(--font-display); }
.eq-keys { display: flex; flex-wrap: wrap; gap: 6px; margin-block: 10px 4px; max-inline-size: 760px; }
.eq-key { min-inline-size: 48px; font-family: var(--font-display); font-size: 18px; }
.eq-wrap, .gr-wrap { background: var(--document); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px; display: grid; place-items: center; margin-block-start: 8px; }
.eq-table td, .eq-table th { white-space: nowrap; }
.tool-scroll { overflow-x: auto; }
.gr-num { inline-size: 5.5em; min-block-size: 44px; text-align: center; font-family: var(--font-display); }
.gr-fns { display: grid; gap: 4px; margin-block-end: 8px; }
.gr-fns > .btn { justify-self: start; }
.gr-fn-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.gr-fn-row .eq-input { flex: 1 1 260px; }
.gr-point { min-block-size: 1.5em; font-size: 18px; }
.gr-values summary { cursor: pointer; font: 700 17px var(--font-display); min-block-size: 44px; display: flex; align-items: center; }
/* SUBJECTS1 batch C: chemistry. Equations are written left to right in every language; the equipment is a grid of
   cards, each a drawing on white with its name and use (names hidden: numbers instead, for a class quiz). */
.ce-atoms { margin-block: 10px; }
.ce-note { margin-block: 8px 0; }
.ce-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font: 600 28px var(--font-display); margin: 8px 0 12px; }
.ce-row sub { font-size: .62em; }
.ce-coef { inline-size: 2.6em; min-block-size: 48px; text-align: center; font: 700 24px var(--font-display); }
.ce-coef.is-shown { border-color: var(--blue); }
.ws-lab-items { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 2px 12px; }
/* SUBJECTS1-FIX: what a sheet took from a tool page (its first question, moved labels), with a way to leave it out */
.ws-from-tool { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; padding: 10px 14px; border: 1px solid var(--line); border-radius: var(--radius-s); background: var(--surface); }
.ws-from-tool p { margin: 0; flex: 1 1 14em; }
.ws-from-tool[hidden] { display: none; }
.lab-grid { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 14px; }
.lab-card { position: relative; border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; display: grid; gap: 4px; justify-items: center; align-content: start; text-align: center; background: var(--surface); }
.lab-card canvas { background: var(--document); border-radius: var(--radius-s); }
.lab-pick { position: absolute; inset-block-start: 6px; inset-inline-start: 6px; min-inline-size: 44px; min-block-size: 44px; display: grid; place-items: center; }
.lab-pick input { inline-size: 22px; block-size: 22px; }
.lab-name { font-size: 17px; margin: 0; }
.lab-use { font-size: 14px; color: var(--ink-2); margin: 0; }
.lab-n { display: none; font: 700 24px var(--font-display); }
.lab-hide-names .lab-name, .lab-hide-names .lab-use { display: none; }
.lab-hide-names .lab-n { display: block; }
#lab-practice { margin-block-start: 24px; }
/* SUBJECTS1: every control on the subject pages is a 44 px touch target, links in lists included */
.subject-related ul a, .source-list a, .hub-text h2 a { display: inline-flex; align-items: center; min-block-size: 44px; min-inline-size: 44px; }
.tool-panel select, .tool-panel .pb-select { min-block-size: 44px; min-inline-size: 56px; }
/* BUGREPORT1: the report dialog, the same on public pages and the board */
.bug-dialog { border: 0; border-radius: 22px; padding: 20px; background: var(--surface); color: var(--ink); width: min(560px, calc(100vw - 24px)); max-height: calc(100dvh - 24px); overflow-y: auto; box-shadow: 0 30px 80px rgba(0,0,0,.25); }
.bug-dialog::backdrop { background: var(--overlay); }
.bug-dialog h2 { font-size: 21px; margin: 0 0 6px; }
.bug-form .textarea { inline-size: 100%; min-height: 64px; }
.bug-form .label { margin-top: 10px; }
.bug-intro, .bug-hint, .bug-status, .bug-to { margin: 6px 0; font-size: 14px; color: var(--ink-2); }
.bug-error { margin: 4px 0 0; font-size: 14px; font-weight: 600; color: var(--red); }
.bug-error[hidden], .bug-step[hidden] { display: none; }
.bug-tech { border: 1px solid var(--line); border-radius: var(--radius-s); padding: 8px 12px; margin: 10px 0 0; }
.bug-tech-text { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: 13px; }
.bug-text { min-height: 180px; }
.bug-dialog .dialog-actions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; margin-top: 12px; }
.footer-report { background: none; border: 0; padding: 0; font: inherit; color: var(--footer-ink); cursor: pointer; text-align: start; }
.footer-report:hover { color: var(--footer-head); text-decoration: underline; }