/* BritMaths Practice: phone first. Brand: navy #0F1D38, gold #C19A56, paper #FBFAF7; Libre Baskerville headings,
   Hanken Grotesk text, Zen Kaku Gothic New wordmark (static/fonts, OFL). Dark follows the phone's setting. */
/* Controls, one vocabulary (owner, 2026-10-19: "take inspiration from claude.ai") -- a student should know what a thing
   does by its shape:
   - a bare glyph (.icon-btn, .tool-btn, no border or fill) opens, switches or goes somewhere small: a tint under the pointer,
     the tint kept while it is open (aria-expanded) or on the page you are in (aria-current); its word is its label and tooltip;
   - a square .button does something once: Check answer, Save, Start. .primary is the one main action of a screen;
   - a pair of .button.quiet with aria-pressed is a switch between two states (Settings: Light | Dark), the pressed one ringed in gold;
   - underlined text (.text-action, .linkish) goes somewhere else, or opens a form you fill in once. */
/* Light is the default (owner, 2026-10-05); the switch in the bar sets data-theme="dark". Dark is black and greys
   with only a hint of gold: the mark, the active tab, the progress ring, the small labels. */
:root{--fig-ink:#000;--fig-paper:#fff;--fig-grid:#c8c8c8;--fig-mid:#8a8a8a;--paper:#FBFAF7;--surface:#fff;--tint:#F3F0E8;--line:#E2DDD1;--line-strong:#CFC8B8;--ink:#0F1D38;--body:#2B3446;
  --muted:#5C564A;--faint:#70695F;--gold:#C19A56;--gold-text:#806026;--field-line:#8B857A;--focus:#806026;--accent:#0F1D38;--accent-hover:#1C2D52;--on-accent:#fff;
  --good:#2B7549;--good-bg:#E6F2EA;--bad:#A63D3A;--bad-bg:#F8E8E6;--warn-bg:#FBF3E2;--warn:#8a5a12;--field:#FBFAF7;
  --shadow:0 1px 2px rgba(15,29,56,.06);--radius:12px;--radius-field:10px;--radius-card:14px;
  --f-serif:"Libre Baskerville",Georgia,serif;--f-sans:"Hanken Grotesk",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --f-mark:"Zen Kaku Gothic New",var(--f-sans);--ease-out:cubic-bezier(.23,1,.32,1);color-scheme:light}
:root[data-theme="dark"]{--fig-ink:#F1F1F2;--fig-paper:#19191C;--fig-grid:#3B3B41;--fig-mid:#8E8E95;--paper:#111113;--surface:#19191C;--tint:#232327;--line:#2C2C31;--line-strong:#3B3B41;
  --ink:#F1F1F2;--body:#D0D0D4;--muted:#BCBCC2;--faint:#A3A3AA;--gold-text:#CFAE70;--field-line:#707078;--focus:#D9B77A;--accent:#ECECEE;--accent-hover:#FFFFFF;--on-accent:#111113;
  --good:#86C99F;--good-bg:#17231B;--bad:#EF9890;--bad-bg:#2A1716;--warn-bg:#26221A;--warn:#D9B77A;--field:#141416;
  --shadow:none;color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
html,body{overflow-x:clip}
body{margin:0;background:var(--paper);color:var(--body);font:16px/1.55 var(--f-sans)}
a{color:inherit}
h1,h2,h3{font-family:var(--f-serif);font-weight:400;color:var(--ink);margin:0 0 .4em;line-height:1.2}
h1{font-size:clamp(26px,6vw,34px);letter-spacing:-.4px}h1 em{font-style:italic;color:var(--muted)}
h2{font-size:20px}h3{font-size:17px}
.eyebrow{font:600 12px var(--f-sans);letter-spacing:.22em;text-transform:uppercase;color:var(--gold-text);margin:0 0 10px}
.lede{color:var(--muted);margin:0 0 18px}
.small{font-size:14px;line-height:1.5;color:var(--faint)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:12px;top:-60px;z-index:50;padding:10px 14px;background:var(--surface);color:var(--ink);border:2px solid var(--focus);
  border-radius:var(--radius-field);font-weight:600}
.skip:focus{top:10px}
main:focus,#q-heading:focus{outline:none}
a:focus-visible,summary:focus-visible,button:focus-visible,[tabindex]:focus-visible,.choice input:focus-visible+span{outline:2px solid var(--focus);outline-offset:2px}
.error{color:var(--bad);background:var(--bad-bg);padding:10px 12px;font-size:14px;border-radius:var(--radius-field)}
.ok,.note{color:var(--good);background:var(--good-bg);padding:10px 12px;font-size:14px;border-radius:var(--radius-field)}
[hidden]{display:none!important}

/* ---- the bar (one block, owner 2026-10-19) ----
   The logo; the places (Practise, Lessons ...) as words; the tools (theme, settings, progress) as bare glyphs, drawn the way
   claude.ai draws its icon buttons: no border or fill at rest, a soft tint under the pointer, the tint kept on the one for
   the page you are on, never a ring that looks switched on. The theme switch says its state by its glyph alone.
   Laptop: logo | places | tools in one row. Phone: logo and tools in a row, the places as a row of tabs under them
   (never a Menu to open, never a strip that scrolls sideways). The bar scrolls away with the page, on a laptop too:
   stuck to the screen it covered the question when marking scrolled to the result (layout review, 2026-10-13). */
.bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:0 20px;padding:6px 12px 6px;
  padding-top:max(6px,env(safe-area-inset-top));background:var(--surface);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:8px;min-height:44px;flex-shrink:0;text-decoration:none;color:var(--ink)}
.brand .mark{height:20px;width:auto;color:var(--gold)}
.brand span{font:500 13px var(--f-mark);letter-spacing:.28em}
.brand em{font:italic 13px var(--f-serif);color:var(--muted)}
.bar-tools{display:flex;align-items:center;gap:0;margin-left:auto}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;flex:none;width:44px;height:44px;min-height:44px;padding:0;margin:0;
  border:0;border-radius:10px;background:none;color:var(--muted);text-decoration:none;cursor:pointer;transition:background .15s,color .15s,transform 120ms var(--ease-out)}
.icon-btn svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
@media (hover:hover) and (pointer:fine){.icon-btn:hover{background:var(--tint);color:var(--ink)}}
.icon-btn:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.icon-btn[aria-current="page"]{background:var(--tint);color:var(--ink)}
.theme-toggle .sun{display:none}:root[data-theme="dark"] .theme-toggle .sun{display:block}:root[data-theme="dark"] .theme-toggle .moon{display:none}
.nav{display:flex;flex-wrap:wrap;align-items:center;order:3;width:calc(100% + 24px);margin:0 -12px -6px;border-top:1px solid var(--line)}
.nav a{flex:1 1 auto;display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:6px 10px;text-decoration:none;
  font-size:14px;color:var(--muted);white-space:nowrap}
@media (hover:hover) and (pointer:fine){.nav a:hover{color:var(--ink)}}
.nav a.on{color:var(--ink);box-shadow:inset 0 -2px 0 var(--gold)}
@media (min-width:700px){
  .bar{gap:8px 20px;padding:10px 16px;padding-top:max(10px,env(safe-area-inset-top))}
  .brand .mark{height:26px}.brand span{font-size:15px;letter-spacing:.32em}.brand em{font-size:14px}
  .bar-tools{order:1;margin-left:0;gap:2px}
  .nav{order:0;width:auto;margin:0;border-top:0}
  .nav a{flex:none;padding:6px 10px}
}
main{max-width:780px;margin:0 auto;padding:20px 16px 120px}
body.narrow main{max-width:460px}

/* ---- pieces ---- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:20px 18px;margin-bottom:16px;box-shadow:var(--shadow)}
label{display:block;font-size:14px;font-weight:600;color:var(--muted);margin:0 0 14px}
input,select{display:block;width:100%;margin-top:6px;font:16px var(--f-sans);color:var(--ink);background:var(--field);
  border:1px solid var(--field-line);border-radius:var(--radius-field);padding:12px;min-height:48px}
input:focus,select:focus{outline:2px solid var(--focus);outline-offset:1px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 18px;border:1px solid var(--accent);
  border-radius:var(--radius);font:600 14px var(--f-sans);letter-spacing:.04em;cursor:pointer;text-decoration:none;
  background:transparent;color:var(--accent);transition:background .15s,border-color .15s,color .15s,transform 120ms var(--ease-out)}
.button.primary{background:var(--accent);color:var(--on-accent)}
@media (hover:hover) and (pointer:fine){.button.primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}}
@media (hover:hover) and (pointer:fine){.button:not(.primary):hover:not(:disabled){background:var(--tint)}}
.button.wide{width:100%}
.button:disabled{opacity:.5;cursor:not-allowed}
.button.quiet{border-color:var(--line-strong);color:var(--muted)}
.button.danger,.button.quiet.danger-text{border-color:var(--bad);color:var(--bad)}
.linkish{background:none;border:0;color:var(--muted);text-decoration:underline;font:inherit;cursor:pointer;padding:8px 0;min-height:44px}
.loading{display:flex;align-items:center;gap:10px;color:var(--muted);padding:30px 0}
.spinner{width:16px;height:16px;border:2px solid var(--line);border-top-color:var(--gold);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
/* in a busy button (common.js busyFeedback): the ring takes the button's own text colour, so it shows on a filled one too */
.button .spinner{flex:none;border-color:currentColor;border-top-color:transparent}
.login{margin-top:6vh}
.grid2{display:grid;grid-template-columns:1fr;gap:0 16px}
@media (min-width:620px){.grid2{grid-template-columns:1fr 1fr}}

/* ---- practising ---- */
.q-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px;flex-wrap:wrap}
.mode{display:inline-flex;align-items:center;gap:6px;font:600 12px var(--f-sans);letter-spacing:.18em;text-transform:uppercase;color:var(--gold-text)}
.mode.check,.mode.retry{color:var(--warn)}
.reason{font:600 16px/1.4 var(--f-sans);color:var(--ink);margin:0 0 12px;scroll-margin-top:120px}
.reason:focus{outline:none}
.meter{height:6px;background:var(--tint);margin:0 0 14px;border-radius:99px;overflow:hidden}.meter i{display:block;height:100%;background:var(--gold)}
.q-card{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--gold);border-radius:var(--radius-card);padding:18px 16px;box-shadow:var(--shadow)}
.q-stem p,.q-text p{margin:0 0 10px}
.q-card{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.q-card input,.q-card textarea{-webkit-user-select:text;user-select:text;-webkit-touch-callout:default}
.diagnosis{margin:6px 0 10px;padding:10px 12px;border-left:3px solid var(--gold);background:var(--tint);border-radius:6px;color:var(--body)}
.fig-slot{margin:6px auto 14px;min-height:40px}
.fig-slot svg.fig{display:block;width:100%;height:auto;margin:0 auto;fill:var(--fig-ink);color:var(--fig-ink)}
.q-card img.fig{display:block;max-width:100%;height:auto;margin:6px auto 14px;background:#fff;border-radius:8px;padding:4px}
.q-part{border-top:1px dashed var(--line);padding-top:14px;margin-top:14px}
.q-part:first-of-type{border-top:0;padding-top:0;margin-top:4px}
.q-head{display:flex;gap:8px;align-items:baseline}
.q-label{font-weight:700;color:var(--ink);min-width:28px}
.q-marks{margin-left:auto;font-size:14px;color:var(--faint);white-space:nowrap}
table.vals{border-collapse:collapse;margin:6px 0 12px;max-width:100%;display:block;overflow-x:auto}
table.vals th,table.vals td{border:1px solid var(--line-strong);padding:6px 10px;text-align:center;font-weight:400}
table.vals th{background:var(--tint)}
.katex{font-size:1.06em}
.katex-display{overflow-x:auto;overflow-y:hidden}
.box{margin:10px 0 4px}
fieldset.box,fieldset.selfmark{border:0;padding:0;min-width:0}
.box .row{display:flex;align-items:center;gap:8px}
.box .row .pre,.box .row .unit{font-size:15px;color:var(--ink);white-space:nowrap;margin:0;font-weight:600}
.box input{margin-top:0;font-size:18px}
.preview{padding:4px 2px 0;color:var(--ink);font-size:17px;overflow-x:auto}
.preview:empty{display:none}
.hint{margin:4px 2px 0;font-size:14px;line-height:1.45;color:var(--faint)}
.slip{margin:6px 2px 0;padding:8px 10px;font-size:14px;line-height:1.45;color:var(--warn);background:var(--warn-bg);border-left:3px solid var(--gold);border-radius:var(--radius-field)}
.choices{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.choice{margin:0;font-weight:400;cursor:pointer}
.choice input{position:absolute;opacity:0;width:1px;height:1px}
.choice span{display:inline-flex;align-items:center;justify-content:center;min-height:46px;min-width:48px;padding:10px 14px;
  border:1px solid var(--field-line);border-radius:var(--radius);background:var(--field);color:var(--ink);font:15px var(--f-sans)}
.choice input:checked+span{background:var(--accent);color:var(--on-accent);border-color:var(--accent);font-weight:700}
.paper-note{font-size:14px;color:var(--muted);background:var(--warn-bg);padding:10px 12px;margin:10px 0;border-radius:var(--radius-field)}
.paper-tip{font-size:14px;color:var(--muted);margin:12px 2px 0}
.ask{margin-top:14px;padding:12px 14px;background:var(--warn-bg);border-radius:var(--radius-field);color:var(--ink);font-size:15px}
.ask p{margin:0}
.ask.error{background:var(--bad-bg);color:var(--bad)}
.ask-card{padding:22px 18px}
.ask-q{font:400 21px/1.35 var(--f-serif);color:var(--ink);margin:0 0 6px}
.ask-choices{display:flex;flex-direction:column;gap:10px;margin-top:16px}.ask-choices .button{width:100%}
.ask-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}.ask-actions .button{flex:1 1 140px}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.actions .button{flex:1 1 160px}

/* the result */
.verdict{display:flex;align-items:center;flex-wrap:wrap;gap:4px 10px;margin:14px 0 6px;font-weight:700;scroll-margin-top:120px}
.verdict:focus{outline:none}
.verdict .marks{font-weight:600;color:var(--muted)}
.verdict.right{color:var(--good)}.verdict.wrong{color:var(--bad)}.verdict.self{color:var(--warn)}.verdict.skipped{color:var(--ink)}
.skipped .tick,.self .tick{background:var(--tint)}
.tick{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;font-size:15px}
.right .tick{background:var(--good-bg)}.wrong .tick{background:var(--bad-bg)}
.yours{font-size:14px;color:var(--muted)}
.answer-line{margin:6px 0}
/* a reason's marks (site fix A1): the scheme's reason, and whether the student's matches */
.reason-check{margin:10px 0;padding:10px 12px;border-left:3px solid var(--gold);background:var(--tint);border-radius:6px}
.reason-check p{margin:4px 0}
.reason-check .reason-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.reason-check .reason-actions .button{flex:1 1 150px;min-height:44px}
.reason-check .reason-state{font-weight:600;color:var(--ink)}
details.solution{margin-top:10px;border:1px solid var(--line);background:var(--field);border-radius:var(--radius-field);overflow:hidden}
details.solution summary{cursor:pointer;padding:12px 14px;font-weight:600;color:var(--ink);min-height:44px}
details.solution ol,details.solution ul{margin:0;padding:0 14px 12px 34px}
details.solution li{margin:6px 0}
.scheme li{list-style:none;margin-left:-20px}
.selfmark{margin:14px 0 4px}
.selfmark legend{font-size:15px;font-weight:600;color:var(--ink);margin-bottom:8px;padding:0}
.marks-pick{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.total{font:400 20px var(--f-serif);color:var(--ink);margin:18px 0 0}

/* the maths keypad: above the phone's keyboard while a box has focus */
.keypad{position:fixed;left:0;right:0;bottom:0;z-index:30;padding:6px;padding-bottom:max(6px,env(safe-area-inset-bottom));
  background:var(--tint);border-top:1px solid var(--line)}
.keypad .keys{display:grid;grid-template-columns:repeat(6,1fr);gap:4px}
.keypad.min .keys{display:none}
.keypad .keys button{min-height:44px;border:1px solid var(--field-line);border-radius:10px;background:var(--surface);color:var(--ink);font:17px var(--f-sans);cursor:pointer;transition:transform 120ms var(--ease-out)}
.pad-toggle{display:block;width:100%;min-height:44px;margin-top:4px;border:0;background:none;color:var(--muted);font:600 14px var(--f-sans);cursor:pointer}
@media (min-width:780px){.keypad{left:50%;right:auto;width:560px;transform:translateX(-50%);bottom:12px;border:1px solid var(--line);border-radius:var(--radius-card)}}

/* the maths keys on a computer (static/laptopkeys.js, owner 2026-10-18): a quiet second row under the focused box, like a
   calculator's; the tokens carry both themes */
.lk{display:flex;flex-wrap:wrap;align-items:center;gap:4px;margin:6px 0 0}
.lk[hidden]{display:none}
.lk button{min-width:36px;min-height:32px;padding:2px 9px;border:1px solid var(--line-strong);border-radius:var(--radius-field);background:var(--surface);
  color:var(--ink);font:15px var(--f-sans);line-height:1;cursor:pointer}
@media (hover:hover) and (pointer:fine){.lk button:hover{background:var(--tint)}}
.lk button:active{background:var(--line)}
.lk button:focus-visible{outline:2px solid var(--focus);outline-offset:1px}
.lk .lk-more{border-color:transparent;background:none;color:var(--muted);font-weight:600;font-size:14px;margin-left:4px}
.lk .lk-guide{flex-basis:100%;margin:2px 0 0;font-size:13px;color:var(--muted)}
.lk .lk-guide:empty{display:none}
@media (hover:hover) and (pointer:fine){.lk .lk-more:hover{color:var(--ink);background:var(--tint)}}

/* no popup naming a key when it is pressed (owner, 2026-10-18): MathLive's `data-tooltip` pops up the key's name above it,
   which on a touch screen shows on every tap. The attribute stays: MathLive also takes each key's aria-label from the
   same tooltip, so a screen reader still hears "square root". */
.ML__keyboard [data-tooltip]::after,.ML__keyboard [data-tooltip]:hover::after,.MLK__tooltip::after{display:none!important;content:none!important}

/* the maths keyboard on phones (static/mathkeys.js, MathLive; ADAPTIVE_PLAN B0c): the field in the box, our tokens on
   its keyboard in both themes. The box's own text box stays, hidden, and carries what the marker reads. */
.mk-typed{position:absolute!important;width:1px!important;height:1px!important;min-height:0!important;padding:0!important;margin:0!important;
  overflow:hidden;clip:rect(0 0 0 0);border:0!important;opacity:0}
.box.mk .preview{display:none}
math-field.mk-field{flex:1;min-width:0;min-height:48px;padding:8px 10px;font-size:22px;color:var(--ink);background:var(--field);
  border:1px solid var(--field-line);border-radius:var(--radius-field);--caret-color:var(--focus);--selection-background-color:var(--tint);
  --placeholder-color:var(--muted);--primary-color:var(--focus);--contains-highlight-background-color:transparent;--smart-fence-color:var(--faint)}
math-field.mk-field:focus-within{outline:2px solid var(--focus);outline-offset:2px}
math-field.mk-field::part(virtual-keyboard-toggle),math-field.mk-field::part(menu-toggle){display:none}
:root{--keyboard-zindex:40;--keyboard-background:var(--tint);--keyboard-border:var(--line);--keyboard-accent-color:var(--focus);
  --keyboard-toolbar-text:var(--muted);--keyboard-toolbar-text-active:var(--ink);--keyboard-toolbar-background-hover:var(--line);
  --keyboard-toolbar-background-selected:var(--surface);--keyboard-horizontal-rule:1px solid var(--line);
  --keycap-height:46px;--keycap-gap:5px;--keycap-font-size:21px;--keycap-small-font-size:17px;--keycap-max-width:100px;
  --keycap-background:var(--surface);--keycap-background-hover:var(--paper);--keycap-background-active:var(--line);--keycap-background-pressed:var(--line);
  --keycap-border:1px solid var(--field-line);--keycap-border-bottom:1px solid var(--field-line);--keycap-text:var(--ink);--keycap-text-active:var(--ink);
  --keycap-text-hover:var(--ink);--keycap-text-pressed:var(--ink);--keycap-shift-text:var(--muted);
  --keycap-secondary-background:var(--line);--keycap-secondary-background-hover:var(--line-strong);--keycap-secondary-text:var(--ink);
  --keycap-secondary-border:1px solid var(--field-line);--keycap-secondary-border-bottom:1px solid var(--field-line);
  --variant-panel-background:var(--surface);--variant-keycap-text-active:var(--ink)}
.nocalc{font-weight:600;color:var(--warn)}
.paper-no{font-weight:600;color:var(--ink)}

/* ---- progress ---- */
.score{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.ring{--p:0;width:112px;height:112px;border-radius:50%;display:grid;place-items:center;
  background:conic-gradient(var(--gold) calc(var(--p)*1%),var(--tint) 0)}
.ring b{display:grid;place-items:center;width:88px;height:88px;border-radius:50%;background:var(--surface);font:400 26px var(--f-serif);color:var(--ink)}
.counts{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 0}
.chip{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;font-size:14px;border:1px solid var(--line);border-radius:999px;background:var(--field)}
.chip i{width:10px;height:10px;border-radius:50%}
.s-mastered{background:var(--good)}.s-learning{background:var(--gold)}.s-weak{background:var(--bad)}.s-unseen{background:var(--line-strong)}
/* the skill map's states (DESIGN section 4): Progress only. Learning is blue, "Needs a look" the warning colour */
.progress-page{--learn:#245A8D}
:root[data-theme="dark"] .progress-page{--learn:#9CC7F0}
.progress-page .s-learning{background:var(--learn)}.progress-page .s-weak{background:var(--warn)}
.map-card{padding:12px}
.map-card h2,.map-card>p,.map-card>button{margin-left:6px;margin-right:6px}
.map-body{margin-top:12px}
.map-bar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:0 12px;font-size:14px}
.map-bar .linkish{padding:8px 0;min-width:44px}.map-tools{display:flex;gap:14px}.map-crumb{color:var(--muted)}
.map-count,.map-note{margin:4px 0 8px}
.map-h{font-size:16px;margin:10px 0}.map-h:focus{outline:none}
.map-canvas{position:relative;margin:0 auto;max-width:100%}
.map-canvas svg{position:absolute;left:0;top:0;pointer-events:none}
.map-tile,.map-node,.map-row{position:absolute;display:flex;flex-direction:column;align-items:flex-start;gap:6px;text-align:left;padding:10px;
  background:var(--surface);color:var(--ink);border:1px solid var(--line-strong);border-radius:var(--radius-field);font:14px/18px var(--f-sans);
  cursor:pointer;overflow-wrap:anywhere;overflow:hidden;min-height:44px}
@media (hover:hover) and (pointer:fine){.map-tile:hover,.map-node:hover,.map-row:hover{border-color:var(--gold)}}
.map-tile b,.map-title{font-weight:600;max-height:54px;overflow:hidden}
.map-node.is-centre{border:2px solid var(--focus)}
.map-node:focus-visible,.map-tile:focus-visible,.map-row:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.map-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.map-row{position:static;width:100%;flex-direction:row;justify-content:space-between;align-items:center;gap:12px}
.map-row-title small{display:block;color:var(--faint)}
.map-state{display:inline-flex;gap:5px;align-items:center;font-size:14px;line-height:18px}
.map-state i,.map-legend i,.map-status i{display:inline-flex;font-style:normal}
.m-unseen{color:var(--faint)}.m-learning{color:var(--learn)}.m-mastered{color:var(--good)}.m-weak{color:var(--warn)}.s-support{color:var(--muted)}
.map-lockword{display:inline-flex;gap:5px;align-items:center;font-size:14px;color:var(--muted)}
.map-changed{outline:2px solid var(--muted);outline-offset:-2px;transition:outline-color .18s}
.map-legend{list-style:none;display:flex;flex-wrap:wrap;gap:4px 16px;margin:12px 0 6px;padding:0;font-size:14px}
.map-legend li{display:inline-flex;gap:4px;align-items:center}
.map-how{margin:6px 0}
.map-pager,.map-more{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap;margin:10px 0}
.map-pager .button,.map-more .button{min-height:44px}
.map-search{margin:10px 0}.map-search input{width:100%}
.map-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.map-actions .button{min-height:44px}
.map-text,.map-text ul{list-style:none;margin:0;padding:0}.map-text>li{padding:10px 0;border-top:1px solid var(--line)}
.map-text ul{padding-left:14px;font-size:14px}
.map-text-area>summary{cursor:pointer;min-height:44px;display:flex;align-items:center;gap:8px;font-weight:600}
.see-on-map{margin-left:10px;min-height:44px;font-size:14px}
.map-live:empty{display:none}
dialog.map-panel{border:1px solid var(--line-strong);border-radius:var(--radius-card);background:var(--surface);color:var(--ink);padding:16px;overflow:auto;
  position:fixed;left:0;right:0;bottom:0;top:auto;margin:0;width:100%;max-width:none;max-height:80vh;z-index:40;box-shadow:var(--shadow)}
dialog.map-panel::backdrop{background:rgba(0,0,0,.45)}
dialog.map-panel h3{margin:0 0 4px;font-size:18px}dialog.map-panel h4{margin:14px 0 4px;font-size:14px;color:var(--muted)}
dialog.map-panel ul{margin:0;padding-left:18px}dialog.map-panel h3:focus{outline:none}
@media (min-width:800px){
  dialog.map-panel[open]:not(:modal){position:static;width:auto;max-height:none;margin:14px 0 0;box-shadow:none}
}
@media (prefers-reduced-motion:reduce){.map-changed{transition:none}}
/* the whole skill map (schema 2): 40 topic colours, one slot per topic (the file's strand_colours, cycling past 40); the
   same slot in every course. Lightness is set for the page's paper, so a dot reads in light and in dark. */
.progress-page{--map-edge:#55555a;--map-area:rgba(0,0,0,.03);
  --map-c0:hsl(0 62% 40%);--map-c1:hsl(138 62% 46%);--map-c2:hsl(275 62% 34%);--map-c3:hsl(53 70% 40%);--map-c4:hsl(190 70% 46%);
  --map-c5:hsl(328 70% 34%);--map-c6:hsl(105 56% 40%);--map-c7:hsl(243 56% 46%);--map-c8:hsl(20 56% 34%);--map-c9:hsl(158 62% 40%);
  --map-c10:hsl(295 62% 46%);--map-c11:hsl(73 62% 34%);--map-c12:hsl(210 70% 40%);--map-c13:hsl(348 70% 46%);--map-c14:hsl(125 70% 34%);
  --map-c15:hsl(263 56% 40%);--map-c16:hsl(40 56% 46%);--map-c17:hsl(178 56% 34%);--map-c18:hsl(315 62% 40%);--map-c19:hsl(93 62% 46%);
  --map-c20:hsl(230 62% 34%);--map-c21:hsl(8 70% 40%);--map-c22:hsl(145 70% 46%);--map-c23:hsl(283 70% 34%);--map-c24:hsl(60 56% 40%);
  --map-c25:hsl(198 56% 46%);--map-c26:hsl(335 56% 34%);--map-c27:hsl(113 62% 40%);--map-c28:hsl(250 62% 46%);--map-c29:hsl(28 62% 34%);
  --map-c30:hsl(165 70% 40%);--map-c31:hsl(303 70% 46%);--map-c32:hsl(80 70% 34%);--map-c33:hsl(218 56% 40%);--map-c34:hsl(355 56% 46%);
  --map-c35:hsl(133 56% 34%);--map-c36:hsl(270 62% 40%);--map-c37:hsl(48 62% 46%);--map-c38:hsl(185 62% 34%);--map-c39:hsl(323 70% 40%);}
:root[data-theme="dark"] .progress-page{--map-edge:#b9b9bf;--map-area:rgba(255,255,255,.04);
  --map-c0:hsl(0 62% 66%);--map-c1:hsl(138 62% 74%);--map-c2:hsl(275 62% 58%);--map-c3:hsl(53 70% 66%);--map-c4:hsl(190 70% 74%);
  --map-c5:hsl(328 70% 58%);--map-c6:hsl(105 56% 66%);--map-c7:hsl(243 56% 74%);--map-c8:hsl(20 56% 58%);--map-c9:hsl(158 62% 66%);
  --map-c10:hsl(295 62% 74%);--map-c11:hsl(73 62% 58%);--map-c12:hsl(210 70% 66%);--map-c13:hsl(348 70% 74%);--map-c14:hsl(125 70% 58%);
  --map-c15:hsl(263 56% 66%);--map-c16:hsl(40 56% 74%);--map-c17:hsl(178 56% 58%);--map-c18:hsl(315 62% 66%);--map-c19:hsl(93 62% 74%);
  --map-c20:hsl(230 62% 58%);--map-c21:hsl(8 70% 66%);--map-c22:hsl(145 70% 74%);--map-c23:hsl(283 70% 58%);--map-c24:hsl(60 56% 66%);
  --map-c25:hsl(198 56% 74%);--map-c26:hsl(335 56% 58%);--map-c27:hsl(113 62% 66%);--map-c28:hsl(250 62% 74%);--map-c29:hsl(28 62% 58%);
  --map-c30:hsl(165 70% 66%);--map-c31:hsl(303 70% 74%);--map-c32:hsl(80 70% 58%);--map-c33:hsl(218 56% 66%);--map-c34:hsl(355 56% 74%);
  --map-c35:hsl(133 56% 58%);--map-c36:hsl(270 62% 66%);--map-c37:hsl(48 62% 74%);--map-c38:hsl(185 62% 58%);--map-c39:hsl(323 70% 66%);}
@media (min-width:900px){.map-card.is-whole{position:relative;left:50%;transform:translateX(-50%);width:min(1180px,calc(100vw - 32px))}}
.wm{position:relative;max-width:1150px;margin:0 auto}
.wm-svg{display:block;width:100%;height:auto;overflow:visible}
.wm-area rect{fill:var(--map-area);stroke:var(--c);stroke-width:1.5;stroke-opacity:.6}
.wm-area text{font:600 15px var(--f-sans);fill:var(--ink)}
.wm-e{fill:none;stroke:var(--map-edge);stroke-width:1.2;opacity:.75}.wm-e.builds_on{stroke-dasharray:5 4}
.wm-e.stub{stroke:var(--c);stroke-width:1.6;opacity:.6}
.wm-n{cursor:pointer;outline:none}
.wm-n .dot{fill:var(--c);stroke:var(--c);stroke-width:2}.wm-n .halo{fill:var(--c);opacity:0}
.wm-n .ring{fill:none;stroke:var(--focus);stroke-width:2;opacity:0}.wm-n .hit{fill:transparent}
.wm-n:focus-visible .ring,.wm-n.pin .ring{opacity:1}
.wm-n.lv-untouched .dot{fill:none;stroke-opacity:.45;stroke-dasharray:2 2}
.wm-n.lv-opened .dot{fill-opacity:.18}.wm-n.lv-learning .dot{fill-opacity:.45}.wm-n.lv-near .dot{fill-opacity:.8}
.wm-n.lv-mastered .dot{fill-opacity:1}.wm-n.lv-mastered .halo{opacity:.28}
.wm-n.lv-support .dot{fill:var(--muted);stroke:none;opacity:.35}
.wm-svg.focus .wm-e{opacity:.06}.wm-svg.focus .wm-e.on{opacity:1;stroke-width:2.2}
.wm-svg.focus .wm-n{opacity:.2}.wm-svg.focus .wm-n.on{opacity:1}
.wm-key{vertical-align:middle;overflow:visible}.wm-key .wm-n{cursor:default}
.wm-card{position:absolute;z-index:5;width:max-content;max-width:290px;padding:10px 12px;font-size:14px;line-height:1.45;background:var(--surface);color:var(--ink);
  border:1px solid var(--line-strong);border-radius:var(--radius-field);box-shadow:0 6px 24px rgba(0,0,0,.2);pointer-events:none}
.wm-card.pinned{pointer-events:auto}
.wm-card p{margin:4px 0}.wm-ct{display:block;font-size:15px}.wm-card .button{min-height:44px;margin-top:6px}
dialog.map-panel p{margin:6px 0}
.map-state.lv-support{color:var(--muted)}
details.topic{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);margin-bottom:10px;overflow:hidden}
details.topic>summary{display:flex;align-items:center;gap:12px;padding:14px 16px;cursor:pointer;min-height:56px;list-style:none}
details.topic>summary::-webkit-details-marker{display:none}
details.topic>summary::after{content:"";flex-shrink:0;width:8px;height:8px;margin:0 4px 4px 2px;border-right:2px solid var(--muted);
  border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .15s}
details.topic[open]>summary::after{transform:rotate(-135deg);margin-bottom:-4px}
details.topic>summary h3{margin:0;flex:1;min-width:0;font-size:16px}
.topic-counts{padding:0 16px;margin:0 0 6px}
.bar5{width:clamp(48px,14vw,90px);height:8px;background:var(--tint);flex-shrink:0;border-radius:99px;overflow:hidden}.bar5 i{display:block;height:100%;background:var(--gold)}
.skills{list-style:none;margin:0;padding:0 16px 10px}
.skills li{display:grid;grid-template-columns:12px 1fr auto;gap:10px;align-items:center;padding:9px 0;border-top:1px solid var(--line);font-size:14px}
.skills li i{width:10px;height:10px;border-radius:50%}
.skills li small{display:block;color:var(--faint);font-size:14px;line-height:1.45}
.skills .pct{font-variant-numeric:tabular-nums;color:var(--muted);font-size:14px}
.focus{list-style:none;margin:0 0 6px;padding:0}
.focus li{display:flex;align-items:center;gap:10px;padding:8px 0;border-top:1px solid var(--line)}
.focus li:first-child{border-top:0}
.focus li i{width:10px;height:10px;border-radius:50%;flex-shrink:0}
.focus li .small{margin-left:auto}
.recent{list-style:none;margin:0;padding:0}
.recent li{display:flex;justify-content:space-between;gap:10px;padding:8px 0;border-top:1px solid var(--line);font-size:14px}
.recent li b{white-space:nowrap}
details.more>summary{padding:10px 0;min-height:44px;cursor:pointer;font-weight:600;color:var(--ink)}
.teacher{background:var(--warn-bg);padding:12px 14px;font-size:14px;border-radius:var(--radius-field)}

/* ---- the owner's page ---- */
.heading-row{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:16px}
.add-form h2{margin-bottom:12px}
.students{display:grid;gap:12px}
.student{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:16px;box-shadow:var(--shadow)}
.student.off{opacity:.6}
.student-top{display:flex;align-items:baseline;justify-content:space-between;gap:10px;flex-wrap:wrap}
.student-top h3{margin:0}
.student .meta{font-size:14px;color:var(--faint);margin:4px 0 10px}
.student .stats{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:14px;margin-bottom:10px}
.student .tools{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px}
.student .tools .button{min-height:44px;padding:8px 14px;font-size:13px}
.switch{display:inline-flex;align-items:center;gap:8px;margin:0;color:var(--ink);cursor:pointer}
.switch input{width:20px;height:20px;min-height:0;margin:0;accent-color:var(--accent)}
details.manage{margin-top:10px;border-top:1px solid var(--line)}
details.manage>summary{padding:12px 0;min-height:44px;cursor:pointer;font-weight:600;color:var(--ink)}
.filters{display:grid;grid-template-columns:1fr;gap:0 16px;margin-bottom:6px}
@media (min-width:620px){.filters{grid-template-columns:2fr 1fr}}
.login .button{width:100%}

@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* ---- choosing a course ---- */
.start h1{margin-bottom:.5em}
.picks{display:grid;gap:10px;margin:0 0 6px}
.pick{display:grid;gap:2px;width:100%;text-align:left;min-height:56px;padding:14px 16px;border:1px solid var(--line-strong);border-radius:var(--radius);
  background:var(--field);color:var(--ink);font:15px var(--f-sans);cursor:pointer;transition:transform 120ms var(--ease-out)}
.pick b{font-weight:600}.pick small{color:var(--faint);font-size:14px}
@media (hover:hover) and (pointer:fine){.pick:hover:not(:disabled){border-color:var(--gold);background:var(--surface)}}
.pick:disabled{cursor:not-allowed;opacity:.6}
.pick .soon{font-style:normal;font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--gold-text)}
.search{margin:4px 0 14px}
fieldset.choices{border:0;padding:0;margin:0 0 14px;min-width:0}
.choices.col{flex-direction:column}.row-choice span{width:100%;justify-content:flex-start}
/* how I practise (B10): an answer and what it means, stacked */
.row-choice span.two{flex-direction:column;align-items:flex-start;gap:2px;text-align:left}
.row-choice span.two small{font-size:13px;color:var(--muted);font-weight:400}
.choice input:checked+span.two small{color:var(--on-accent)}
.prof-q{margin:0 0 18px}.prof-q[hidden]{display:none}
.prof-legend{font:600 16px var(--f-sans);color:var(--ink);padding:0;margin:0 0 6px}
.back{margin:-8px 0 4px;text-decoration:none}
.center{text-align:center}
.enrolled{margin:4px 0 18px;padding:12px 14px;background:var(--tint);border-radius:var(--radius-field)}
.enrolled b{display:block;color:var(--ink)}.enrolled a{font-size:14px;color:var(--muted)}
/* ---- what was covered in class (progress page) ---- */
.cover{border:0;padding:12px 16px 4px;margin:0 0 6px;border-top:1px dashed var(--line);min-width:0}
.cover legend{font-size:14px;font-weight:600;color:var(--muted);padding:0;margin-bottom:2px}
.cover .choices{margin:8px 0}.cover .choice span{min-height:44px;font-size:14px;padding:8px 12px}
.cover-subs summary{font-size:14px;color:var(--muted);cursor:pointer;min-height:44px;display:flex;align-items:center}
.cover-subs ul{list-style:none;margin:0;padding:0}
.cover-subs li{display:grid;grid-template-columns:1fr minmax(0,160px);gap:8px;align-items:center;padding:6px 0;border-bottom:1px solid var(--line)}
.cover-subs li label{margin:0;font-weight:400;font-size:14px;color:var(--body)}
.cover-subs select{margin:0;min-height:44px;padding:8px;font-size:14px}
.cover-note{margin:4px 0 0;min-height:1em}
/* ---- focus mode, first looks ---- */
.focus-bar{display:flex;align-items:center;flex-wrap:wrap;gap:4px 12px;margin:0 0 12px;font-size:14px;color:var(--muted)}
.focus-bar:empty{display:none}
.focus-bar .focus-on{color:var(--ink)}.focus-bar .linkish{font-size:14px}
.focus-btn{min-height:44px;padding:8px 14px;margin-left:auto}
.focus-pick fieldset{border:0;margin:0 0 10px;padding:0}
.focus-pick legend{font:600 15px var(--f-sans);color:var(--ink);padding:0;margin-bottom:4px}
.fpick{display:flex;align-items:flex-start;gap:10px;margin:0;padding:8px 0;font-weight:400;font-size:15px;color:var(--body);border-bottom:1px solid var(--line);min-height:44px}
.fpick input{display:inline-block;width:22px;height:22px;min-height:0;padding:0;border:0;margin:2px 0 0;flex:0 0 22px;accent-color:var(--accent)}
.fpick span{flex:1 1 auto;min-width:0}
.fpick small{color:var(--faint)}
.idea{margin:6px 0 10px;padding:10px 12px;border-left:3px solid var(--good);background:var(--good-bg);border-radius:6px;color:var(--body)}
.focus-note{margin:0 0 14px}
.focus-topic-btn{margin:8px 0 6px;width:100%}
/* The front door's doors in (owner, 2026-10-07; four since 2026-10-10: practice both ways, progress, profile) */
.quick-links{display:grid;gap:12px;margin:6px 0 14px}
@media (min-width:560px){.quick-links{grid-template-columns:1fr 1fr}}
.door{display:flex;align-items:center;gap:14px;padding:16px;border:1px solid var(--line-strong);border-radius:var(--radius-card);text-decoration:none;
  background:var(--surface);color:var(--ink);transition:border-color .15s,transform 120ms var(--ease-out)}
@media (hover:hover) and (pointer:fine){.door:hover{border-color:var(--gold)}}.door:active{transform:scale(.97)}
.door.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.door.primary .door-text span{color:var(--on-accent);opacity:.8}
.door-icon{flex:0 0 40px;height:40px;border-radius:50%;display:grid;place-items:center;background:var(--tint)}
.door.primary .door-icon{background:rgba(255,255,255,.12)}
.door-icon svg{width:22px;height:22px;fill:none;stroke:var(--gold);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.door-text{display:flex;flex-direction:column;gap:2px}.door-text b{font-size:17px}.door-text span{font-size:14px;color:var(--muted)}
/* Practice on your own: the settings */
.settings-bar{justify-content:space-between}
.set-now{color:var(--ink)}
.set-btn{min-height:40px;padding:6px 12px;font-size:14px}
.set-btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
.level-pick{margin:6px 0 18px}
.level-pick label{font-weight:400;color:var(--body)}
.level-pick input[type=range]{width:100%;min-height:44px;padding:0;border:0;background:none;accent-color:var(--gold)}
.level-ends{display:flex;justify-content:space-between;margin-top:-6px}
.topics-head{display:flex;align-items:baseline;justify-content:space-between;margin-top:8px}
.set-topic legend .fpick{border-bottom:0;font-weight:600}
.fpick.sub{padding-left:32px}
.settings-actions{position:sticky;bottom:0;background:var(--surface);padding:10px 0 4px;margin:0}
/* Report a problem */
.report{margin-top:18px}
.report-open{font-size:14px;color:var(--faint)}
.report-form{margin-top:8px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-field);background:var(--field)}
.report-form fieldset{border:0;margin:0 0 8px;padding:0}.report-form legend{font-weight:600;color:var(--ink);margin-bottom:4px}
.rpick{display:flex;align-items:center;gap:10px;margin:0;padding:6px 0;font-weight:400;min-height:40px}
.rpick input{width:20px;height:20px;min-height:0;margin:0;accent-color:var(--accent)}
.report-form textarea{width:100%;font:inherit;padding:8px 10px;border:1px solid var(--field-line);border-radius:var(--radius-field);background:var(--surface);color:var(--ink)}
.report-actions{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.report-done{margin-top:18px}
/* This sitting's run, the skill's bar, what comes next */
.run{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 0 12px;min-height:22px}
.run-dots{display:flex;gap:5px;align-items:center}
.dot{width:9px;height:9px;border-radius:50%;background:var(--line-strong);display:block}
/* d-: .skip is the skip link's */
.dot.d-full{background:var(--good)}.dot.d-part{background:var(--gold)}.dot.d-miss{background:var(--bad);opacity:.75}
.dot.now{background:none;box-shadow:inset 0 0 0 2px var(--gold)}
.run-meta{display:flex;gap:12px;font-size:13px;color:var(--faint)}
.run-meta b{color:var(--ink);font-weight:700}
.q-card.won{border-top-color:var(--good);transition:border-color 200ms var(--ease-out)}
.skill-move{margin:16px 0 4px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-field);background:var(--field)}
.skill-top{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:14px}
.skill-name{color:var(--ink);font-weight:600}.skill-state{color:var(--muted)}
.skill-move.up .skill-state b{color:var(--good)}
.star{color:var(--gold)}
.skill-bar{position:relative;height:8px;margin-top:8px;border-radius:99px;background:var(--tint);overflow:hidden}
.skill-bar i{position:absolute;left:0;top:0;bottom:0;border-radius:99px}
.skill-bar .was{background:var(--line-strong)}
/* the bar's length is its width; the move is a scale from where it was (practice.js skillHTML), so it never forces layout */
.skill-bar .now{background:var(--gold);transform-origin:left;transition:transform 400ms var(--ease-out) 100ms}
.skill-move.down .skill-bar .now{background:var(--line-strong)}
.lesson-done,.learn-first-card{animation:rise 200ms var(--ease-out) both}
.up-next{margin:14px 0 8px;font-size:14px;color:var(--muted);display:flex;flex-wrap:wrap;gap:4px 8px;align-items:baseline;animation:rise 200ms var(--ease-out) 100ms both}
.up-label{font:600 11px var(--f-sans);letter-spacing:.18em;text-transform:uppercase;color:var(--gold-text)}
.up-next b{color:var(--ink)}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
/* the result arrives as one short rise, verdict then solution and skill move then up next, 50ms apart (review 2026-10-20) */
.q-result .verdict{animation:rise 200ms var(--ease-out) both}
.q-result>:not(.verdict),.skill-move{animation:rise 200ms var(--ease-out) 50ms both}
/* The explanation in words (ADAPTIVE_PLAN B4) */
.explain .ex-plan{margin:0;padding:0 14px 8px;color:var(--ink)}
.explain .ex-steps{padding:0 14px 8px 34px}
.explain .ex-steps p{margin:0}
.explain .ex-math{margin-top:2px;color:var(--ink)}
.explain .ex-fact{font-size:14px;color:var(--faint);font-style:italic}
.explain .ex-check{margin:0;padding:0 14px 12px}
@media (prefers-reduced-motion:reduce){.up-next{animation:none}.skill-bar .now{transition:none}}
.reports-admin{margin-top:28px}
.report-row{padding:12px 0;border-top:1px solid var(--line)}.report-row p{margin:0 0 4px}.report-row.off{opacity:.6}
.report-row code{font-size:13px;word-break:break-all}
.code-show{font-size:28px;letter-spacing:.12em;font-variant-numeric:tabular-nums;margin:8px 0;word-break:break-all;user-select:all}
.actions .skill-move,.actions .up-next,.actions .total{flex:1 0 100%;width:100%}
.dot.d-skip{background:none;box-shadow:inset 0 0 0 2px var(--line-strong)}
.settings-bar{flex-wrap:nowrap}.set-now{flex:1 1 0;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.set-btn{flex:0 0 auto}
/* The reviewers' site: what a box expects, beside it -- marked as the reviewer's, not the student's */
.expect{display:flex;align-items:baseline;flex-wrap:wrap;gap:6px 8px;margin:6px 0 2px;padding:6px 10px;font-size:14px;color:var(--ink);
  border:1px dashed var(--gold);border-radius:var(--radius-field);background:var(--warn-bg)}
.expect code{font:600 15px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--ink);word-break:break-all}
.expect-tag{font:600 11px var(--f-sans);letter-spacing:.16em;text-transform:uppercase;color:var(--gold-text)}
.expect small{color:var(--faint)}
.expect-answer{margin:0 0 8px}
.choices .expect{flex-basis:100%}
/* ... under the box, never beside it: the page is the student's page, the answers added (owner, 2026-10-10: "the review
   pages look exactly the same as what the users see apart from the answers") */
/* Persona list */
.personas{display:grid;gap:10px;margin:14px 0}
.persona{display:grid;gap:2px;padding:14px 16px;border:1px solid var(--line-strong);border-radius:var(--radius);text-decoration:none;color:var(--ink);background:var(--surface)}
@media (hover:hover) and (pointer:fine){.persona:hover{border-color:var(--gold)}}.persona b{font-size:17px}.persona small{color:var(--faint);font-size:14px}
.calib{width:100%;border-collapse:collapse;font-size:14px;margin:6px 0}
.calib th,.calib td{text-align:right;padding:6px 8px;border-bottom:1px solid var(--line)}.calib th:first-child,.calib td:first-child{text-align:left}
.calib td.off{color:var(--bad);font-weight:700}

/* ---- pause (owner, 2026-10-07): beside the theme switch on the practice pages; blurs everything until resumed ---- */
.pause-veil{opacity:0;transition:opacity 120ms var(--ease-out);position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;padding:16px;
  background:color-mix(in srgb,var(--paper) 55%,transparent);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.pause-veil[hidden]{display:none}
.pause-veil:not(.shown){pointer-events:none}
.pause-veil.shown{opacity:1;transition-duration:200ms}
.pause-card{max-width:360px;width:100%;text-align:center;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-card);padding:28px 22px;box-shadow:var(--shadow);transform:scale(.97);transition:transform 120ms var(--ease-out)}
.pause-veil.shown .pause-card{transform:none;transition-duration:200ms}
.pause-card h2{margin:0 0 8px;font-family:var(--f-serif,inherit)}
.pause-card p{margin:0 0 20px;color:var(--muted)}
body.paused{overflow:hidden}
/* the exam question: the summers first, the other sittings folded away (owner, 2026-10-07) */
.other-sessions{margin:4px 0 14px}
.other-sessions summary{cursor:pointer;color:var(--muted);font-size:14px;min-height:44px;display:flex;align-items:center}

/* ---- small, clean controls; a clear view of the question on a phone (owner, 2026-10-10: "a clear view of the
   questions ... the buttons don't sit right ... more advanced, minimal, with small clean buttons") ---- */
.button{min-height:42px;padding:9px 16px;border-radius:10px;font:600 14px/1.2 var(--f-sans);letter-spacing:0}
.choice span{min-height:42px;padding:8px 14px}
.focus-btn{min-height:36px;padding:6px 12px;font-size:13px}
.actions{gap:8px}
.act-main{display:flex;gap:8px;flex:1 0 100%}
.actions .act-main .button{flex:0 0 auto}
.actions .act-main #check{flex:1 1 auto;order:2}
.actions .act-main #skip{order:1}
.act-minor{align-self:flex-start;background:none;border:0;padding:6px 2px;min-height:32px;font:500 13px var(--f-sans);color:var(--faint);
  cursor:pointer;text-decoration:underline;text-decoration-color:var(--line-strong);text-underline-offset:3px}
@media (hover:hover) and (pointer:fine){.act-minor:hover{color:var(--muted)}}
.report{margin-top:10px}.report-open{font-size:13px;min-height:32px;padding:6px 2px}
.paper-tip{font-size:13px;margin:10px 2px 0}
.focus-bar .linkish{min-height:32px;padding:4px 0;font-size:13px;text-decoration:none;color:var(--gold-text)}
@media (hover:hover) and (pointer:fine){.focus-bar .linkish:hover{text-decoration:underline}}
@media (max-width:699px){
  main{padding:12px 12px 120px}
  /* what practice is on: one line (cut short with ...), its controls a line of small links under it */
  .focus-bar{gap:0 14px;margin-bottom:10px;font-size:13px}
  .focus-bar .focus-on,.focus-bar>.small{flex:1 0 100%;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .focus-btn{margin-left:0}
  /* the question: the words larger, the frame lighter */
  .run{margin-bottom:8px}
  .q-top{margin-bottom:6px}
  .reason{font-size:15px;margin-bottom:10px;scroll-margin-top:12px}
  .verdict{scroll-margin-top:12px}
  .q-card{padding:14px 14px 12px;border-top-width:2px;border-radius:12px}
  .q-stem,.q-text{font-size:17px;line-height:1.55}
  .box input{min-height:46px}
  table.vals th,table.vals td{padding:5px 7px;font-size:15px}
  .actions{margin-top:14px}
  .ask-card{padding:18px 14px}
  .ask-q{font-size:19px}
}
/* the bar's controls are all quiet links, the same size (Focus on topics was a boxed button beside them) */
.focus-bar .focus-btn{border:0;background:none;min-height:32px;padding:4px 0;margin-left:0;color:var(--gold-text);font-weight:500;font-size:13px}
@media (hover:hover) and (pointer:fine){.focus-bar .focus-btn:hover:not(:disabled){background:none;text-decoration:underline}}
.set-btn{min-height:34px;padding:4px 10px;font-size:13px}

/* ---- the front door (owner, 2026-10-10): how BritMaths works and what it offers ---- */
body.landing main{max-width:1080px;padding-bottom:40px}
.landing h1{font-size:clamp(32px,6.4vw,54px);line-height:1.08;letter-spacing:-.8px;margin-bottom:.35em}
.landing h2{font-size:clamp(24px,4.2vw,34px);line-height:1.15;letter-spacing:-.4px;max-width:20ch}
.landing h2 em{font-style:italic;color:var(--muted)}
.landing .lede{font-size:17px;max-width:54ch}
.landing .hero{display:grid;gap:32px;align-items:center;padding:4vh 0 8px}
@media (min-width:880px){.landing .hero{grid-template-columns:1.15fr .85fr;gap:56px;padding-top:8vh}}
.landing .hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin:4px 0 12px}.landing .hero-actions .button{flex:0 1 auto;min-width:150px}
.landing .hero-show{margin:0}
.landing .show-card{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--gold);border-radius:var(--radius-card);
  padding:18px 18px 16px;box-shadow:var(--shadow)}
.landing .show-head{display:flex;justify-content:space-between;align-items:baseline;margin:0 0 12px;font:400 19px var(--f-serif);color:var(--ink)}
.landing .show-skills{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.landing .show-skills li{display:grid;grid-template-columns:1fr auto;gap:6px 12px;align-items:center;font-size:15px;color:var(--ink)}
.landing .show-skills .sbar{grid-column:1/-1;grid-row:2;display:block;height:6px;background:var(--tint);border-radius:99px;overflow:hidden}
.landing .show-skills .sbar i{display:block;height:100%;background:var(--gold);border-radius:99px}
.landing .show-skills .state{font:600 11px var(--f-sans);letter-spacing:.14em;text-transform:uppercase;font-style:normal}
.landing .show-skills .secure{color:var(--good)}.landing .show-skills .learning{color:var(--gold-text)}.landing .show-skills .opening{color:var(--faint)}
.landing .show-next{margin-top:16px;padding:12px 14px;background:var(--tint);border-radius:var(--radius-field)}
.landing .show-next p{margin:0}.landing .show-next p+p{margin-top:2px;color:var(--body);font-size:15px}
.landing .band{margin-top:clamp(56px,9vw,96px);padding-top:clamp(28px,4vw,40px);border-top:1px solid var(--line)}
.landing .steps{list-style:none;margin:28px 0 0;padding:0;display:grid;gap:28px;counter-reset:step}
@media (min-width:640px){.landing .steps{grid-template-columns:1fr 1fr;gap:32px 36px}}
@media (min-width:1000px){.landing .steps{grid-template-columns:repeat(4,1fr)}}
.landing .steps li{counter-increment:step;position:relative}
.landing .steps h3{font-size:19px;margin:12px 0 6px}
.landing .steps h3::before{content:counter(step) ". ";color:var(--gold-text)}
.landing .steps p,.landing .offer p{margin:0;color:var(--muted);font-size:15px}
.landing .step-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--tint)}
.landing .step-icon svg{width:22px;height:22px;fill:none;stroke:var(--gold);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.landing .try{display:grid;gap:24px;align-items:start}
@media (min-width:880px){.landing .try{grid-template-columns:.8fr 1.2fr;gap:56px}}
.landing .try-form{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:10px 0 4px}
.landing .try-form .box{flex:1 1 180px;margin:0}.landing .try-form .button{flex:0 0 auto}
.landing .sample .verdict{margin:10px 0 0}
.landing .marking{margin-top:16px;border-top:1px solid var(--line);padding-top:6px}
.landing .marking summary{cursor:pointer;min-height:44px;display:flex;align-items:center;font-weight:600;color:var(--ink)}
.landing .mark-part{padding:8px 0 4px}.landing .mark-part+.mark-part{border-top:1px dashed var(--line)}
.landing .mark-label{margin:0 0 4px}
.landing .working{margin:0 0 6px;padding-left:22px;color:var(--body)}.landing .working p,.landing .scheme p{margin:0}
.landing .scheme{list-style:none;margin:0;padding:8px 12px;background:var(--tint);border-radius:var(--radius-field);font-size:14px;color:var(--muted)}
.landing .scheme li{margin-left:0}
.landing .offers{display:grid;gap:14px;margin-top:28px;grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr))}
.landing .offer{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:18px;box-shadow:var(--shadow)}
.landing .offer h3{font-size:18px;margin-bottom:6px}
.landing .coming{margin:16px 0 0;font-size:15px;color:var(--muted)}.landing .coming b{color:var(--gold-text);font-weight:600}
.landing .courses{list-style:none;margin:24px 0 12px;padding:0;display:grid;gap:8px}
@media (min-width:760px){.landing .courses{grid-template-columns:1fr 1fr}}
.landing .course{display:grid;grid-template-columns:auto 1fr;gap:2px 14px;align-items:baseline;padding:14px 16px;border:1px solid var(--line);
  border-radius:var(--radius-card);background:var(--surface)}
.landing .course .codes{font:500 13px var(--f-mark);letter-spacing:.12em;color:var(--faint)}
@media (max-width:559px){.landing .course{grid-template-columns:1fr}}
@media (min-width:560px){.landing .course .codes{grid-row:1/3;min-width:84px}}
.landing .course-name{color:var(--ink);font-weight:600}
.landing .course-state{font-size:14px;color:var(--faint)}
.landing .course.open{border-color:var(--gold)}.landing .course.open .codes{color:var(--gold-text)}.landing .course.open .course-state{color:var(--good)}
.landing .beliefs dl{display:grid;gap:18px 36px;margin:26px 0 0}
@media (min-width:760px){.landing .beliefs dl{grid-template-columns:1fr 1fr}}
.landing .beliefs dt{font:400 19px var(--f-serif);color:var(--ink);margin-bottom:2px}
.landing .beliefs dd{margin:0;color:var(--muted)}
.landing .band.last{text-align:center}.landing .band.last h2{margin:0 auto 18px}.landing .band.last .button{min-width:200px}
.foot{max-width:1080px;margin:0 auto;padding:28px 16px 40px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:6px 16px;
  justify-content:space-between;font:500 13px var(--f-mark);letter-spacing:.24em;color:var(--ink);text-transform:uppercase}
.foot .small{font-family:var(--f-sans);letter-spacing:0;text-transform:none}

/* One journey across the front door and practice. Keep the brand, give every control room. */
.button,.focus-btn,.set-btn,.act-minor,.report-open,
.focus-bar .linkish,.focus-bar .focus-btn,.choice span,.rpick{min-height:44px}
button,.button{min-width:44px}
.landing .hero-text>.small a,.text-action,.home-links a,.alternative a,.access a:not(.button),.access-help a,.site-foot a{
  display:inline-flex;align-items:center;min-height:44px;text-underline-offset:4px}
.text-action{font-size:14px;color:var(--gold-text)}
body.narrow main{max-width:560px;padding-top:32px;padding-bottom:48px}
.login{margin-top:0}
.page-intro{margin:0 0 20px}.page-intro h1{font-size:clamp(24px,4vw,30px)}
.page-intro p{margin:8px 0 0;max-width:60ch}
.course-context{border-left:3px solid var(--gold);padding:2px 0 2px 12px;margin:0 0 18px}
.course-context p{font-size:14px;margin:0;color:var(--muted);line-height:1.5}
.course-context b{color:var(--ink);font-weight:600}
/* the course on one line, its code and tier on their own line beneath: nothing to wrap, so no separator ever starts
   or ends a line (the dot sits between code and tier, and nowhere else) */
.course-context .cc-code{display:block;font-size:13px;color:var(--faint)}
.course-context .eyebrow{margin-bottom:6px}
.account-overview .button{margin-top:12px}
.next-step{padding:20px;background:var(--surface);border:1px solid var(--line-strong);border-top:3px solid var(--gold);border-radius:var(--radius-card)}
.next-step .small{margin:12px 0 0}
.home-links{display:flex;flex-wrap:wrap;gap:4px 24px;font-size:14px;color:var(--muted)}
.alternative{margin:10px 0 0}
.landing .hero{align-items:start}
.landing .show-skills .state,.up-label{font-size:13px;letter-spacing:.08em}
.landing .band{scroll-margin-top:140px}
.landing .access{max-width:740px;margin-left:auto;margin-right:auto}
.access-help{margin-top:16px;border-top:1px solid var(--line);padding-top:8px}
.access-help summary{cursor:pointer;min-height:44px;padding:10px 0;color:var(--ink);font-weight:600}
.access-help p{font-size:14px;color:var(--muted)}
.access-help dl{display:grid;gap:16px}.access-help dt{font-weight:600;color:var(--ink)}
.access-help dd{margin:4px 0 0;color:var(--muted)}
.pick:disabled{opacity:1;background:var(--tint);border-style:dashed;cursor:not-allowed}
.pick:disabled b,.pick:disabled small,.pick .soon{color:var(--muted)}
.pick:disabled .soon{font-size:13px;letter-spacing:.08em}
.progress-next{margin:0 0 24px}
.topic summary{min-height:52px;cursor:pointer}
.practice-status:empty{display:none}
.practice-status{position:sticky;bottom:12px;z-index:21;padding:12px 16px;margin:16px 0 0;border:1px solid var(--gold);border-radius:var(--radius-field);background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.site-message{max-width:780px;margin:16px auto}
.site-foot{max-width:1080px;margin:0 auto;padding:16px;display:flex;align-items:center;justify-content:space-between;gap:8px 24px;flex-wrap:wrap;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}
[aria-busy=true]{cursor:progress}
.fig-view{margin:0 0 12px}.fig-view .button{font-size:13px}
.fig-dialog{width:min(96vw,1000px);max-height:90dvh;padding:16px;border:1px solid var(--line-strong);border-radius:var(--radius-card);background:var(--surface);color:var(--ink)}
.fig-dialog::backdrop{background:rgba(0,0,0,.65)}
.fig-dialog .fig-scroll{overflow:auto;margin-top:12px}.fig-dialog svg,.fig-dialog img{display:block;width:900px;max-width:none;height:auto}
@media (max-width:699px){
  /* practice pages: the tabs and the mode already say where you are, so on a phone the question comes first; Learn and
     Progress keep their heading (layout review, 2026-10-13: Learn lost its explanation) */
  .practice-intro{display:none}
  main{padding-top:18px}.landing .hero{padding-top:12px;gap:24px}
  .focus-bar .focus-on,.focus-bar>.small{white-space:normal;overflow:visible}
  .set-now{white-space:normal;overflow:visible}
  .focus-bar{gap:2px 16px}.focus-bar .focus-btn{min-height:44px}
  .q-card{padding:16px}.next-step{padding:16px}
  .landing .band{scroll-margin-top:16px}
  .site-foot{padding-bottom:max(20px,env(safe-area-inset-bottom))}
}
@media (prefers-reduced-motion:reduce){.spinner{animation:none}.button .spinner:not(.alone){display:none}.button .spinner.alone{border-top-color:currentColor}}

/* Learn a subtopic from the start (owner, 2026-10-12): the Learn page, a lesson's checklist, its worked example, the tick */
.tick-ok{color:var(--good);font-weight:700;margin-right:6px}
.learn-subs{list-style:none;margin:0;padding:0 16px 10px}
.learn-sub{padding:12px 0;border-top:1px solid var(--line)}
.learn-sub-title{margin:0 0 6px;color:var(--ink)}
.learn-part{display:grid;grid-template-columns:1fr auto;align-items:center;gap:12px;padding:4px 0}
.learn-part .small{margin:0}
.learn-part-name{margin:0;font-size:14px;color:var(--ink)}
.learn-state{display:block;font-size:13px;color:var(--muted);margin-top:2px}
.learn-state.got{color:var(--good)}
.learn-go{min-height:44px;padding:8px 16px}
.back-learn{display:inline-block;margin-bottom:6px}
.lesson-head h1{margin:0 0 10px}
.lesson-dots{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:6px}
.lesson-dots i{width:22px;height:6px;border-radius:99px;background:var(--line-strong)}
.lesson-dots i.ld-got{background:var(--good)}
.lesson-dots i.ld-now{background:var(--gold)}
.lesson-dots i.ld-missed{background:var(--bad);opacity:.6}
.lesson-meta{margin:0 0 4px}
.lesson-list>summary{cursor:pointer;font-size:14px;color:var(--muted);padding:6px 0;min-height:44px;display:flex;align-items:center}
.lesson-list ol{list-style:none;margin:0 0 10px;padding:0}
.lesson-list li{display:flex;gap:10px;padding:5px 0;font-size:14px;color:var(--body)}
.lesson-list .ls-mark{width:16px;text-align:center;color:var(--faint)}
.lesson-list .ls-got .ls-mark{color:var(--good)}
.lesson-list .ls-now{color:var(--ink);font-weight:600}
.lesson-list .ls-now .ls-mark{color:var(--gold-text)}
.lesson-list .ls-missed .ls-mark{color:var(--bad)}
.mode.learn{color:var(--gold-text)}
.example-card{border-top-color:var(--gold)}
.lesson-done{text-align:left}
.tick-big{font-size:44px;line-height:1;color:var(--good);margin:0 0 6px}
.lesson-missed{margin:0 0 6px;padding-left:20px}
.learn-ticks{padding:0 16px 8px}
.learn-ticks ul{list-style:none;margin:0;padding:0}
.learn-ticks li{display:grid;grid-template-columns:18px 1fr;gap:6px;padding:6px 0;font-size:14px;border-top:1px solid var(--line)}
.learn-ticks li small{display:block;color:var(--faint)}
.learn-ticks .tick-ok{margin:0}
.learn-count{color:var(--good);white-space:nowrap}

/* Finish for now, the recap and Welcome back (B9.2/B9.6, 2026-10-12) */
.finish-now{min-height:32px;padding:0;font-size:13px;color:var(--gold-text)}
.recap-shown,.recap-again,.recap-exam{border-top:1px solid var(--line);padding-top:12px;margin-top:12px}
.recap-shown p,.recap-again p,.recap-exam p{margin:0 0 6px}
.recap-shown .eyebrow,.recap-again .eyebrow,.recap-exam .eyebrow{margin-bottom:4px}
.recap-shown:not(.none) p:last-child{color:var(--good);font-weight:600}
.recap .small{margin-top:14px}
.session-up{margin:10px 0;padding:10px 12px;border-radius:var(--radius-field);background:var(--warn-bg);color:var(--ink)}
.session-up .session-finish,.session-up .session-on{min-height:32px;padding:0;color:var(--gold-text);font-weight:600}
.preset{display:flex;flex-direction:column;gap:2px;padding:14px 16px;margin:6px 0 16px;border:1px solid var(--line-strong);border-radius:var(--radius-field);background:var(--field)}
.preset span{color:var(--muted);font-size:14px}
#preset-no{margin-top:10px}

/* The question screen (layout review, 2026-10-13): Check / I don't know, and after marking the skill, Up next and
   Next, inside the question's card under the answer; the sitting's line under the task; marks said once. */
.q-card .paper-tip{margin:14px 0 0}
.q-card .actions{margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.q-card .ask{margin-top:14px}
.q-card .skill-move{margin:0 0 4px;padding:0;border:0;background:none}
.q-card .up-next{margin:12px 0 6px}
.example-how{margin:0 0 12px}
.run{justify-content:space-between;align-items:center;flex-wrap:wrap;gap:4px 12px;margin:14px 0 0;padding:10px 2px 0;border-top:1px solid var(--line)}
.run[hidden]{display:none}
.run-meta{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 10px;font-size:14px;color:var(--muted)}
.run-label{font:600 12px var(--f-sans);letter-spacing:.08em;text-transform:uppercase;color:var(--faint)}
.run .finish-now{min-height:44px;font-size:14px}
.report{margin-top:12px}
/* a lesson's head: the title, then one line -- where the student is -- that opens the list of kinds */
.lesson-head h1{margin:0 0 6px}
.lesson-list>summary{flex-wrap:wrap;gap:4px 10px;list-style:none}
.lesson-list>summary::-webkit-details-marker{display:none}
.lesson-list>summary::after{content:"▾";color:var(--faint);font-size:12px}
.lesson-list[open]>summary::after{content:"▴"}
.lesson-list .lesson-dots{margin:0}
.lesson-list .lesson-meta{margin:0}
/* pages without a keypad or a sticky status need no room for them at the bottom */
main{padding-bottom:48px}
main:has(.practice){padding-bottom:120px}
/* no question on the screen (the recap, Welcome back, a lesson's end): nothing to pause, no practice controls */
body.no-question .pause-toggle,body.no-question #focus-bar,body.no-question #settings-bar{display:none}
.reason,.verdict{scroll-margin-top:16px}
/* review walk of the layout (2026-10-13): no question on the screen needs no room for a keypad or a status at the bottom;
   the question's main actions are 48px (secondary ones stay 44px); the mark-it-yourself line sits above Save */
body.no-question main{padding-bottom:48px}
.q-card .actions .act-main .button,.q-card #next,.q-card #my-turn,.q-card #retry{min-height:48px}
.q-card .self-pending{flex:1 0 100%;margin:4px 0 2px;font-size:14px;color:var(--ink)}
/* the practice toolbar (layout review step 3, walk 2026-10-13): the mode's options and Pause above the question -- Pause is
   no longer in the site's bar. The tab under the bar names the mode; a label here spelt it a second way (2026-10-19) */
.practice-tools{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:0 0 10px}
.lesson-tools .back-learn{margin:0 auto 0 0}
.practice-tools{justify-content:flex-end}
/* the toolbar's controls are drawn like the bar's icons (owner, 2026-10-19, after claude.ai): a glyph, a word where one is
   needed, no border; the tint says "open" on Practice options. Pause is its glyph alone, its word for screen readers. */
.tool-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:6px 12px;border:0;
  border-radius:10px;background:none;color:var(--muted);font:600 14px var(--f-sans);cursor:pointer;transition:background .15s,color .15s,transform 120ms var(--ease-out)}
.tool-btn svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
@media (hover:hover) and (pointer:fine){.tool-btn:hover{background:var(--tint);color:var(--ink)}}
.tool-btn:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.tool-btn[aria-expanded="true"]{background:var(--tint);color:var(--ink)}
.pause-toggle{width:44px;padding:0}
.pause-toggle span{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
/* ---- a test session's bar with its readiness meter (owner, 2026-10-19; now a kind of session, 2026-10-21) ---- */
.test-bar[hidden]{display:none}
body.in-test #options-toggle,body.in-test #options-menu,body.in-test #focus-bar,body.in-session #options-toggle,body.in-session #options-menu,body.in-session #focus-bar{display:none}
/* in a test Pause is the toolbar's only control: it sits in the test bar's corner, not alone on a row of its own above it
   (release walk, 2026-10-20: a lone glyph and ~50px of nothing on a phone) */
body.in-test .practice-tools:not(.lesson-tools){position:relative;height:0;margin:0}
body.in-test .practice-tools:not(.lesson-tools) .pause-toggle{position:absolute;top:6px;right:6px;z-index:1}
body.in-session .practice-tools:not(.lesson-tools){position:relative;height:0;margin:0}
body.in-session .practice-tools:not(.lesson-tools) .pause-toggle{position:absolute;top:2px;right:6px;z-index:1}
body.in-test .practice-tools:not(.lesson-tools) .pause-toggle{top:6px}
.test-bar{margin:0 0 12px;padding:14px 16px}
.test-bar .test-topics{margin:0 0 10px;font-size:15px}
.ready{height:10px;border-radius:99px;background:var(--tint);border:1px solid var(--line);overflow:hidden}
.ready-fill{display:block;width:100%;height:100%;border-radius:99px;background:var(--gold);transform-origin:left;transition:transform 400ms var(--ease-out) 100ms}
.ready-label{margin:6px 0 12px}
.test-actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.test-date{display:block;margin:14px 0;font-size:15px}.test-date input{display:block;margin-top:6px;min-height:44px}
@media (prefers-reduced-motion:reduce){.ready-fill{transition:none}}
.options-menu{display:flex;flex-direction:column;margin:0 0 12px;border:1px solid var(--line);border-radius:var(--radius-field);background:var(--surface)}
.options-menu[hidden],.options-menu:empty{display:none}
.options-menu button{min-height:48px;padding:12px 16px;border:0;border-bottom:1px solid var(--line);background:none;color:var(--ink);
  font:500 15px var(--f-sans);text-align:left;cursor:pointer;transition:transform 120ms var(--ease-out)}
.options-menu button:last-child{border-bottom:0}
.options-menu button:hover{background:var(--tint)}
/* with no question on screen (Start with Lessons, a finished sitting) the mode's options go, but not Take control: a
   test may be on topics not unlocked yet (docs/test_mode/DESIGN.md), so a new student with a test on Friday needs it most
   (release walk, 2026-10-20) */
body.no-question .practice-tools:not(.lesson-tools) #options-toggle,body.no-question .options-menu{display:none}
.lesson-list .lesson-dots{margin:4px 0 6px}
/* Learn first (phase 6, 2026-10-13): where to begin with nothing unlocked; the quick check beside a lesson; a locked
   topic in the picker */
.learn-first{list-style:none;padding:0;margin:4px 0 18px;display:grid;gap:10px}
.learn-first li{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 12px;padding:10px 0;border-bottom:1px solid var(--line)}
.learn-first-name{flex:1 1 220px;min-width:0;color:var(--body)}
.learn-first-go,.learn-go-row{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end}
.learn-check{min-height:44px;padding:8px 14px}
.fpick.locked{color:var(--muted)}
.fpick.locked input{opacity:.5}
.fpick.locked .locked-go,.unlock .locked-go{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.fpick.locked .locked-go .button,.unlock .locked-go .button{min-height:44px;padding:8px 14px;font-size:14px}
/* the topic picker's Practise these / Cancel stay at the foot of the screen while its list scrolls: on a phone they sat
   under every topic's rows (the front-door review, 2026-10-14); a message above them, not over them */
.focus-pick .pick-actions{position:sticky;bottom:0;z-index:2;flex-wrap:nowrap;margin:8px -18px -20px;
  padding:12px 18px max(12px,env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--line);
  border-radius:0 0 var(--radius-card) var(--radius-card)}
.focus-pick .pick-actions .button{flex:1 1 0;min-width:0}
body:has(#focus-pick:not([hidden]) .pick-actions) .practice-status{bottom:calc(88px + env(safe-area-inset-bottom, 0px))}
@media (max-width:520px){.learn-part{grid-template-columns:1fr}.learn-go-row{justify-content:flex-start}}
/* a past answer, opened from Progress (A7) */
.recent a{color:inherit;font-weight:600}
.answer-page .q-card{margin-top:10px}
/* general maths (/practise): no marks shown, whatever the course the question came from */
.practice[data-track="general"] .q-marks,.practice[data-track="general"] .verdict .marks,.practice[data-track="general"] .total{display:none}
.keep-note{color:var(--muted);margin:18px 0 0}

/* ---- open sign-up (P3) ---- */
.or{text-align:center;margin:14px 0}
.quick-links{display:flex;flex-wrap:wrap;gap:4px 18px;margin:0 0 12px}
.note a,.ok a{color:inherit}
.verify-note{display:flex;flex-wrap:wrap;align-items:center;gap:4px 12px;padding:10px 16px;margin:12px auto;max-width:780px}
.verify-note .linkish{padding:4px 0;min-height:44px;color:inherit}
.foot-links{display:flex;flex-wrap:wrap;gap:4px 16px}.foot-links a{min-width:44px;justify-content:center}
.legal h2{font:700 18px var(--f-sans);color:var(--ink);margin:24px 0 6px}
.legal ul{padding-left:20px;line-height:1.55}.legal li{margin:0 0 8px}
.legal p{line-height:1.55}
/* the parent pays (P4): what the course adds, and the link a student sends */
.ticks{margin:0 0 14px;padding-left:20px}.ticks li{margin:4px 0}
#unlock-url{width:100%;font:inherit;padding:10px 12px;margin:6px 0 10px;color:var(--ink);background:var(--field);border:1px solid var(--field-line);border-radius:var(--radius-field)}
#unlock .tools{display:flex;gap:10px;flex-wrap:wrap}

/* tap targets (walk 2026-10-18): a lesson link in Progress and the guest note's Sign in are 44px tall to the thumb */
.learn-ticks li{min-height:44px;align-items:center}
.learn-ticks li a{display:inline-flex;align-items:center;min-height:44px;margin:-6px 0}
.keep-note a{display:inline-block;padding:13px 6px;margin:-13px -6px}

/* ---- the Settings page (owner, 2026-10-19): one heading per kind of setting, quiet cards under it ---- */
.set-group{margin:0 0 28px}
.set-h{font-size:18px;margin:0 0 10px}
.set-group .card:last-child{margin-bottom:0}
.set-group .card h3{margin:0 0 8px}
.set-group .card>.tools{margin-top:4px}
.set-group .tools [aria-pressed="true"]{border-color:var(--gold);color:var(--ink);box-shadow:inset 0 0 0 1px var(--gold)}

/* ---- the signed-in home (owner, 2026-10-19): the student's next step and nothing else ---- */
.home .page-intro{margin-bottom:12px}
.home .page-intro .eyebrow{margin:0 0 4px}
.home-course{margin:0 0 20px;font-size:15px;color:var(--muted);line-height:1.5}
.home-course b{display:block;color:var(--ink);font-weight:600}
.home .alternative span{display:block}
.home .lede{font-size:17px;margin:0 0 16px}
.home .next-step .eyebrow{margin:0 0 10px}
.home .next-step .button{margin:0}
.session-home .test-topics{margin:0 0 12px;font-size:15px}
.session-home .ready-label{margin:6px 0 14px}
.home .access-help{margin-top:40px}
.set-out{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px}

/* ---- pressed (review 2026-10-20): a small, quick give under the finger; mouse hover is only for mice (see the hover media above) ---- */
.button:active:not(:disabled),.pick:active:not(:disabled),.choice:active span,.tool-btn:active,.icon-btn:active,.keypad .keys button:active,.options-menu button:active{transform:scale(.97)}
/* the one hover rule not wrapped in place: it sits beside PR #21's edit, so touching its line would conflict; on a touch screen it is switched off here instead */
@media not all and (hover:hover) and (pointer:fine){.options-menu button:hover{background:none}}

/* ---- Practise as sessions (owner, 2026-10-21): the list, the slim bar, the sheet ---- */
body.sessions-list .practice-tools,body.sessions-list #focus-bar,body.sessions-list #options-menu,body.sessions-list #keypad,body.sessions-list #pause-toggle{display:none}
.sessions h2{margin:0 0 12px;font-size:20px}
.sessions .note{margin:0 0 12px}
.session-card{display:grid;grid-template-columns:1fr auto;gap:8px 12px;align-items:center;margin-bottom:12px;padding:16px}
.session-main{min-width:0}
.session-name{margin:0 0 4px;font:600 17px/1.3 var(--f-sans);color:var(--ink);overflow-wrap:anywhere}
.session-meta{margin:0 0 4px;font-size:14px;color:var(--body)}
.session-used{margin:0;color:var(--faint)}
.session-acts{display:flex;align-items:center;gap:4px}
.session-resume{min-width:112px}
.session-more{color:var(--muted);border-radius:10px}
.session-more svg{width:22px;height:22px;fill:currentColor}
@media (hover:hover) and (pointer:fine){.session-more:hover{background:var(--tint);color:var(--ink)}}
.session-menu{grid-column:1/-1;display:flex;flex-direction:column;margin:0;border:1px solid var(--line);border-radius:var(--radius-field);background:var(--surface)}
.session-menu[hidden]{display:none}
.session-menu button{min-height:48px;padding:12px 16px;border:0;border-bottom:1px solid var(--line);background:none;color:var(--ink);font:500 15px var(--f-sans);text-align:left;cursor:pointer}
.session-menu button:last-child{border-bottom:0}
.session-menu button:focus-visible{outline:2px solid var(--focus);outline-offset:-2px}
@media (hover:hover) and (pointer:fine){.session-menu button:hover{background:var(--tint)}}
.session-edit{grid-column:1/-1}
.session-edit .actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.session-rename label{display:block;font-size:15px}
.session-ready{border-top:3px solid var(--gold)}
.sessions-new{margin:4px 0 16px}
.older{margin:0 0 16px}.older summary{cursor:pointer;min-height:44px;display:flex;align-items:center;font-weight:600;color:var(--muted)}
.older summary:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.older summary{gap:6px;list-style:none}.older summary::-webkit-details-marker{display:none}
.older-chev{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform 150ms var(--ease-out)}
.older[open] .older-chev{transform:rotate(180deg)}
.sessions-full{margin:4px 0 16px}
#sessions-h:focus{outline:0}#sessions-h:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.sheet-msgs{flex:none;padding:0 18px}.sheet-msgs p{margin:8px 0 0}
.sh-topics .error{margin:8px 0 0}
.home-sessions-link{display:inline-flex;align-items:center;min-height:44px;padding:0 8px;text-decoration:underline}
.home-sessions-link:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
@media (max-width:520px){
  .session-card{grid-template-columns:1fr}
  .session-acts{justify-content:space-between}
  .session-resume{flex:1 1 auto}
}
@media (min-width:700px){.sessions-new{width:auto}}
.session-bar{margin:0 0 12px;padding:6px 14px 6px 8px}
.session-bar.test-bar{padding:8px 16px 14px 8px}
.session-top{display:flex;align-items:center;gap:8px;min-height:44px;padding-right:48px;min-width:0}
.session-back{display:inline-flex;align-items:center;gap:4px;min-height:44px;padding:0 10px;border-radius:10px;font-weight:600;font-size:15px;color:var(--gold-text);text-decoration:none;flex:none}
.session-back:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
@media (hover:hover) and (pointer:fine){.session-back:hover{background:var(--tint);text-decoration:underline}}
.session-title{min-width:0;font-weight:600;font-size:15px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.session-bar .session-sub,.session-bar .ready,.session-bar .ready-label,.session-bar>.small{margin-left:10px}
.session-bar .session-sub{margin-top:0;margin-bottom:8px}
.session-bar .ready-label{margin-bottom:0}
/* the sheet: full screen on a phone, a centred panel on a laptop */
body.sheet-open{overflow:hidden}
.sheet{position:fixed;inset:0;z-index:900;background:var(--paper);display:flex}
.sheet[hidden]{display:none}
.sheet-panel{display:flex;flex-direction:column;width:100%;height:100%;min-height:0}
.sheet-head{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 8px 8px 18px;border-bottom:1px solid var(--line);flex:none}
.sheet-head h2{margin:0;font-size:19px}
.sheet-head h2:focus{outline:0}
.sheet-head h2:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.sheet-head .icon-btn svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.sheet-body{flex:1 1 auto;overflow-y:auto;overscroll-behavior:contain;padding:16px 18px 24px;margin:0;min-height:0}
.sheet-body fieldset{border:0;margin:0 0 14px;padding:0;min-width:0}
.sheet-body legend{font:600 15px var(--f-sans);color:var(--ink);padding:0;margin-bottom:4px}
.sheet-body legend small{font-weight:400;color:var(--faint)}
.sheet-body .test-date{margin:6px 0 14px}
.sh-topics{margin:4px 0 0 28px}
.sh-note{margin:8px 0 0;padding:10px 12px;border-left:3px solid var(--gold);background:var(--tint);border-radius:6px}
.sh-switch{border-top:1px solid var(--line);margin:6px 0 10px;padding-top:12px;font-weight:600;color:var(--ink)}
.sh-switch input{appearance:none;-webkit-appearance:none;position:relative;width:46px;height:28px;flex:0 0 46px;border-radius:99px;background:var(--line-strong);margin:0;cursor:pointer;transition:background .15s}
.sh-switch input::after{content:"";position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:50%;background:var(--surface);transition:transform 150ms var(--ease-out)}
.sh-switch input:checked{background:var(--accent)}
.sh-switch input:checked::after{transform:translateX(18px);background:var(--on-accent)}
.sh-switch input:focus-visible{outline:2px solid var(--focus);outline-offset:3px}
.sh-how{margin:10px 0 0;width:100%;justify-content:space-between}
.sh-how[aria-expanded="true"] span{transform:rotate(180deg)}
.sh-prof{margin:10px 0 0;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-field);background:var(--tint)}
.sh-prof .prof-q{margin:0 0 14px}.sh-prof .prof-legend{font-size:15px}
.sheet-foot{display:flex;gap:10px;padding:12px 18px max(12px,env(safe-area-inset-bottom));border-top:1px solid var(--line);background:var(--surface);flex:none}
.sheet-foot .button{flex:1 1 0;min-width:0}
@media (min-width:700px){
  .sheet{align-items:center;justify-content:center;background:rgba(15,29,56,.45);padding:24px}
  :root[data-theme="dark"] .sheet{background:rgba(0,0,0,.6)}
  .sheet-panel{width:min(600px,100%);height:auto;max-height:min(90vh,820px);background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden}
  .sheet-foot{justify-content:flex-end}.sheet-foot .button{flex:0 0 auto;min-width:140px}
}
@media (prefers-reduced-motion:reduce){.sh-switch input,.sh-switch input::after{transition:none}}