:root{
  --bg:#f7f5ff;--surface:#fff;--ink:#253052;--muted:#6f7893;
  --primary:#6557d9;--primary-dark:#4d43b5;--primary-soft:#ece9ff;--primary-line:#dcd6ff;
  --mint:#dff7ed;--mint-ink:#20705a;--sun:#fff1c7;--sun-ink:#7a5c14;
  --coral:#ffe4df;--coral-ink:#9b4d43;--sky:#e1f3ff;--sky-ink:#2f6386;
  --border:#e6e2f2;--danger:#b0424b;
  --shadow:0 18px 60px rgba(63,52,117,.12);--shadow-soft:0 8px 24px rgba(63,52,117,.08);
}
*{box-sizing:border-box}
html{background:var(--bg);-webkit-text-size-adjust:100%}
body{
  margin:0;min-height:100vh;color:var(--ink);
  font-family:ui-rounded,"SF Pro Rounded",-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,system-ui,sans-serif;
  background:
    radial-gradient(circle at 8% 6%,rgba(255,218,117,.30),transparent 19rem),
    radial-gradient(circle at 94% 18%,rgba(151,222,255,.26),transparent 22rem),
    linear-gradient(180deg,#f8f6ff,#f4f8ff);
  padding-bottom:env(safe-area-inset-bottom);
}
button,input{font:inherit;color:inherit}
button{cursor:pointer;-webkit-tap-highlight-color:transparent;border:1px solid transparent}
:focus-visible{outline:3px solid var(--primary);outline-offset:3px;border-radius:12px}
.hidden{display:none!important}
.muted-copy{color:var(--muted);font-size:.88rem;line-height:1.5}

.app-shell{width:min(720px,100%);margin:0 auto;padding:16px 14px 48px}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}
.who{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.8);border:1px solid var(--border);border-radius:16px;padding:8px 14px 8px 8px;text-align:left}
.who-avatar{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;font-size:1.25rem;background:var(--primary-soft)}
.who-text small{display:block;font-size:.65rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:800}
.who-text strong{display:block;font-size:.98rem;line-height:1.2}
.ghost-btn{background:rgba(255,255,255,.75);color:var(--primary-dark);border-color:var(--border);border-radius:14px;padding:11px 15px;font-weight:800}

.card{position:relative;overflow:hidden;background:rgba(255,255,255,.97);border:1px solid rgba(230,226,242,.92);border-radius:28px;box-shadow:var(--shadow);padding:clamp(20px,5vw,38px)}
.card:after{content:"";position:absolute;right:-46px;top:-54px;width:145px;height:145px;border-radius:50%;background:var(--primary-soft);opacity:.55;z-index:0}
.card>*{position:relative;z-index:1}
h2{margin:0 0 12px;font-size:clamp(1.5rem,5vw,2.2rem);line-height:1.14;letter-spacing:-.03em}
h3{margin:28px 0 10px;font-size:1.05rem}
p{line-height:1.55}
.eyebrow{margin:0 0 8px;font-size:.72rem;text-transform:uppercase;letter-spacing:.12em;color:var(--primary);font-weight:850}
.field-label{display:block;font-weight:800;margin:18px 0 8px;font-size:.9rem}
.error-text{color:var(--danger);font-weight:800;margin:10px 0 0}

.primary-btn,.secondary-btn,.danger-btn,.choice-btn{border-radius:16px;padding:15px 18px;font-weight:800;min-height:54px;transition:transform .12s,box-shadow .12s,background .12s}
.primary-btn{background:linear-gradient(135deg,var(--primary),#7c6eec);color:#fff;box-shadow:0 9px 20px rgba(101,87,217,.24)}
.secondary-btn{background:var(--primary-soft);color:var(--primary-dark);border-color:var(--primary-line)}
.danger-btn{background:#fff2f3;color:var(--danger);border-color:#f1cfd2}
.primary-btn:hover,.secondary-btn:hover{transform:translateY(-1px)}
.primary-btn:active,.secondary-btn:active{transform:translateY(1px)}
.full-width{width:100%;margin-top:10px}
.text-input{width:100%;border:2px solid var(--border);background:#fff;border-radius:16px;padding:15px 16px;font-size:1.15rem}
.text-input:focus{border-color:var(--primary);outline:none}
.inline-form{display:grid;grid-template-columns:1fr auto;gap:10px}

/* ---------- profiles ---------- */
.profile-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin:18px 0}
.profile-card{background:#fff;border:2px solid var(--border);border-radius:22px;padding:18px 14px;text-align:center;box-shadow:var(--shadow-soft)}
.profile-card:hover{transform:translateY(-2px)}
.profile-card .pc-avatar{width:56px;height:56px;margin:0 auto 10px;border-radius:18px;display:grid;place-items:center;font-size:1.8rem}
.profile-card strong{display:block;font-size:1.05rem}
.profile-card small{display:block;color:var(--muted);margin-top:4px;font-size:.76rem}
.picker{display:flex;flex-wrap:wrap;gap:9px}
.picker button{width:50px;height:50px;border-radius:16px;background:#fff;border:2px solid var(--border);font-size:1.35rem;display:grid;place-items:center}
.picker button[aria-pressed="true"]{border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-soft)}
.picker .swatch{border:2px solid rgba(0,0,0,.06)}
.band-picker{display:grid;gap:9px}
.band-opt{text-align:left;background:#fff;border:2px solid var(--border);border-radius:18px;padding:14px 16px}
.band-opt strong{display:block}
.band-opt small{display:block;color:var(--muted);margin-top:3px;font-weight:600}
.band-opt[aria-pressed="true"]{border-color:var(--primary);background:var(--primary-soft)}

/* ---------- home ---------- */
.hero-wrap{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:center;margin-bottom:18px}
.hero-icon{width:72px;height:72px;border-radius:24px;background:linear-gradient(145deg,var(--sun),#fff8df);display:grid;place-items:center;font-size:2.1rem;box-shadow:var(--shadow-soft);transform:rotate(-3deg)}
.hero-copy p{margin:0;color:var(--muted)}
.welcome-kicker{display:inline-block;background:var(--mint);color:var(--mint-ink);padding:7px 12px;border-radius:999px;font-size:.78rem;font-weight:850;margin-bottom:10px}
.journey-title{display:flex;justify-content:space-between;align-items:baseline;margin-top:22px}
.journey-title span{font-size:.78rem;color:var(--muted)}
.journey-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:12px 0 18px}
.journey-cell{border:1px solid var(--border);border-radius:16px;padding:13px 4px 10px;text-align:center;background:#faf9ff}
.journey-cell strong{display:block;font-size:1rem}
.journey-cell span{display:block;font-size:.66rem;color:var(--muted);margin-top:4px}
.journey-cell.done{background:var(--mint);border-color:#bfe9da;color:var(--mint-ink)}
.journey-cell.current{background:var(--primary-soft);border-color:var(--primary-line);color:var(--primary-dark)}
.notice{background:#faf9ff;border:1px solid var(--border);border-radius:18px;padding:15px 16px;margin:18px 0;color:#53607c}
.notice strong{color:var(--ink)}

/* ---------- question ---------- */
.progress-row{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:14px;margin-bottom:20px;color:var(--muted);font-weight:800;font-size:.85rem}
.progress-track{height:10px;border-radius:999px;background:#eeebf7;overflow:hidden}
.progress-bar{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--primary),#8d7ff2);transition:width .3s}
.question-card{background:linear-gradient(145deg,#fbfaff,#f6f4ff);border:1px solid var(--primary-line);border-radius:24px;padding:clamp(18px,5vw,30px);text-align:center;margin-bottom:18px}
.skill-pill{display:inline-block;max-width:100%;margin:0;color:var(--primary-dark);font-weight:850;
  background:var(--primary-soft);padding:7px 13px;border-radius:999px;font-size:.78rem;
  line-height:1.35;text-align:center}
.question-prompt{font-size:clamp(1.9rem,8vw,3.6rem);margin:16px 0 0;letter-spacing:-.03em;line-height:1.12;overflow-wrap:break-word}
.question-prompt.wordy{font-size:clamp(1.15rem,4.4vw,1.6rem);line-height:1.35;letter-spacing:-.01em}

.answer-display{display:block;min-height:66px;border:2px dashed var(--primary-line);background:#fff;border-radius:18px;font-size:2rem;font-weight:800;text-align:center;line-height:62px;letter-spacing:.02em;margin-bottom:12px;overflow:hidden}
.answer-display .placeholder{color:#c3bce0}
.answer-display.right{border-style:solid;border-color:#8fd3ba;background:var(--mint);color:var(--mint-ink)}
.answer-display.wrong{border-style:solid;border-color:#f0b6ae;background:var(--coral);color:var(--coral-ink)}

/* The keypad is the point of the redesign: a phone's decimal keypad has no
   minus key, so negative answers were impossible to type. */
.keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.keypad button{min-height:60px;border-radius:16px;background:#fff;border:1px solid var(--border);font-size:1.4rem;font-weight:800;box-shadow:0 2px 0 rgba(63,52,117,.06)}
.keypad button:active{transform:translateY(2px);box-shadow:none;background:#f7f5ff}
.keypad .key-fn{background:#f6f4ff;color:var(--primary-dark)}
.keypad .key-minus{background:var(--sun);color:var(--sun-ink);border-color:#f0dda6}
.keypad .key-enter{background:linear-gradient(135deg,var(--primary),#7c6eec);color:#fff;font-size:1.05rem;border:none}
.button-row{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:12px}
.button-row .secondary-btn{min-height:50px;font-size:.92rem;padding:12px}
.hint-box,.feedback-box{border-radius:18px;padding:15px 16px;margin-top:14px;font-weight:700;line-height:1.5}
.hint-box{background:var(--sun);color:var(--sun-ink);border:1px solid #f0dda6}
.feedback-box{background:var(--sky);color:var(--sky-ink);border:1px solid #c6e5f6}
.feedback-box.good{background:var(--mint);color:var(--mint-ink);border-color:#bfe9da}

.choice-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:11px;margin-top:20px}
.choice-grid.tight{grid-template-columns:1fr 1fr;margin-top:0}
.choice-btn{text-align:left;background:#fff;border-color:var(--border);box-shadow:var(--shadow-soft);padding:16px}
.choice-btn:hover{border-color:var(--primary-line);background:#faf9ff;transform:translateY(-1px)}
.choice-btn .choice-icon{display:block;font-size:1.4rem;margin-bottom:5px}
.choice-btn small{display:block;color:var(--muted);font-weight:650;margin-top:3px}
.choice-grid.tight .choice-btn{text-align:center;font-size:1.35rem;font-weight:800;min-height:66px}

.strategy-steps{display:grid;gap:10px;margin:18px 0}
.strategy-step{display:grid;grid-template-columns:36px 1fr;gap:12px;align-items:center;background:#faf9ff;border:1px solid var(--border);padding:12px 14px;border-radius:16px}
.strategy-step span{width:32px;height:32px;border-radius:11px;background:var(--primary-soft);display:grid;place-items:center;color:var(--primary-dark);font-weight:900}
.strategy-step p{margin:0}
.worked-example{background:var(--mint);color:var(--mint-ink);border:1px solid #c2e9dc;border-radius:18px;padding:17px;margin-bottom:16px}
.worked-example span{display:block;text-transform:uppercase;letter-spacing:.09em;font-size:.68rem;font-weight:900;margin-bottom:6px}
.worked-example strong{display:block;font-size:1.15rem}

.student-summary{display:grid;grid-template-columns:1fr 1fr;gap:11px;margin:20px 0}
.summary-chip{background:#faf9ff;border:1px solid var(--border);border-radius:18px;padding:16px}
.summary-chip strong{display:block;font-size:1.05rem}
.summary-chip span{display:block;color:var(--muted);font-size:.8rem;margin-top:5px}

/* ---------- report ---------- */
.report-header{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.report-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 6px}
.report-tabs button{border-radius:999px;padding:9px 15px;background:#fff;border:1px solid var(--border);font-weight:800;font-size:.86rem}
.report-tabs button[aria-pressed="true"]{background:var(--primary);color:#fff;border-color:var(--primary)}
.metrics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-top:14px}
.metric{background:#faf9ff;border:1px solid var(--border);border-radius:16px;padding:14px}
.metric span{display:block;font-size:.72rem;color:var(--muted)}
.metric strong{display:block;font-size:1.2rem;margin-top:4px}
.timeline{display:grid;gap:8px}
.timeline-item,.pattern-item{border:1px solid var(--border);border-radius:14px;padding:12px 14px;background:#faf9ff;line-height:1.45}
.timeline-item{display:grid;grid-template-columns:1fr auto auto;gap:10px;align-items:center}
.timeline-item small{color:var(--muted)}
.skill-report{display:grid;gap:9px}
.skill-row{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center;border:1px solid var(--border);border-radius:15px;padding:13px 14px}
.skill-row small{color:var(--muted)}
.skill-bar-track{height:8px;background:#ece9f5;border-radius:99px;overflow:hidden;margin-top:7px}
.skill-bar{height:100%;border-radius:99px;background:var(--primary)}
.skill-bar.warn{background:#e0a33f}.skill-bar.bad{background:#cf6b6b}
.status{font-weight:850;white-space:nowrap}
.recommendation-list{padding-left:20px}
.recommendation-list li{margin:9px 0;line-height:1.5}
.settings-panel{margin-top:26px;border-top:1px solid var(--border);padding-top:16px}
.settings-panel summary{font-weight:850;cursor:pointer;padding:6px 0}
.settings-form{display:grid;gap:6px;margin-top:10px}

.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:13px 20px;border-radius:14px;font-weight:800;box-shadow:var(--shadow);z-index:50;max-width:90vw;text-align:center}

@media(max-width:620px){
  .app-shell{padding:12px 11px 34px}
  .card{border-radius:22px;padding:20px 16px}
  .hero-wrap{grid-template-columns:1fr}
  .journey-grid{gap:5px}.journey-cell span{font-size:.6rem}
  .progress-row{grid-template-columns:1fr;gap:7px}
  .choice-grid,.student-summary{grid-template-columns:1fr}
  .choice-grid.tight{grid-template-columns:1fr 1fr}
  .metrics-grid{grid-template-columns:1fr 1fr}
  .timeline-item{grid-template-columns:1fr auto}
  .timeline-item small{grid-column:1/-1}
  .skill-row{grid-template-columns:1fr}
  .keypad button{min-height:56px;font-size:1.3rem}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media(prefers-contrast:more){.card{border-color:#8b83b5}.keypad button{border-color:#8b83b5}}

/* ---------- daily push ---------- */
.today{display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;background:#faf9ff;border:1px solid var(--border);border-radius:20px;padding:14px 16px;margin:18px 0 12px}
.today-ring{position:relative;width:54px;height:54px}
.today-ring svg{width:54px;height:54px;transform:rotate(-90deg)}
.ring-bg{fill:none;stroke:#e9e5f7;stroke-width:5}
.ring-fg{fill:none;stroke:var(--primary);stroke-width:5;stroke-linecap:round;stroke-dasharray:119.4;stroke-dashoffset:119.4;transition:stroke-dashoffset .5s}
.today-ring span{position:absolute;inset:0;display:grid;place-items:center;font-weight:850;font-size:.92rem}
.today-copy strong{display:block;font-size:1rem}
.today-copy span{display:block;color:var(--muted);font-size:.8rem;margin-top:2px;line-height:1.4}
.today-streak{text-align:center;min-width:56px}
.today-streak strong{display:block;font-size:1.4rem;color:var(--primary-dark)}
.today-streak span{display:block;font-size:.62rem;color:var(--muted);text-transform:uppercase;letter-spacing:.07em;font-weight:800}

.focus{background:linear-gradient(145deg,var(--primary-soft),#fff);border:1px solid var(--primary-line);border-radius:20px;padding:15px 16px;margin-bottom:6px}
.focus-eyebrow{display:block;font-size:.66rem;text-transform:uppercase;letter-spacing:.11em;color:var(--primary-dark);font-weight:850}
.focus-head strong{display:block;font-size:1.1rem;margin-top:3px}
.focus-track{height:9px;background:#fff;border:1px solid var(--primary-line);border-radius:99px;overflow:hidden;margin:11px 0 8px}
.focus-bar{height:100%;background:linear-gradient(90deg,var(--primary),#8d7ff2);border-radius:99px;transition:width .4s}
.focus-note{font-size:.8rem;color:var(--muted);line-height:1.45}

/* Learning is a stage, not a verdict. Red belongs to errors and to things that
   need a person; a thirteen-year-old reading "Learning" beside a red dot
   concludes she is bad at maths, which is the opposite of the intent. */

/* ---------- mastery list ---------- */
.mastery-list{display:grid;gap:8px;margin-top:12px}
.mastery-row{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;border:1px solid var(--border);border-radius:15px;padding:12px 14px;background:#fff}
.mastery-row strong{display:block;font-size:.97rem}
.mastery-row .m-track{height:7px;background:#ece9f5;border-radius:99px;overflow:hidden;margin-top:7px}
.mastery-row .m-bar{height:100%;border-radius:99px;background:var(--primary)}
.m-bar.learning{background:#6d7fd4}.m-bar.practising{background:#e0a33f}.m-bar.secure{background:#2e9c7d}
.m-bar.struggling{background:#c4534b}.m-bar.teaching{background:#4a8fc7}
.mastery-row small{display:block;color:var(--muted);font-size:.76rem;margin-top:6px;line-height:1.4}
.m-chip{font-size:.7rem;font-weight:850;padding:5px 9px;border-radius:99px;white-space:nowrap;text-align:center}
.m-chip.learning{background:#e8ebfa;color:#3f4a94}
.m-chip.practising{background:#fdf1dc;color:#8a6216}
.m-chip.secure{background:var(--mint);color:var(--mint-ink)}
.m-chip.new{background:#f0eef8;color:var(--muted)}
@media(max-width:620px){.today{grid-template-columns:auto 1fr;row-gap:10px}.today-streak{grid-column:2;text-align:left}}

/* ---------- sync ---------- */
.sync-badge{display:inline-block;font-size:.7rem;font-weight:850;padding:5px 11px;border-radius:99px;margin-bottom:4px}
.sync-badge.ok{background:var(--mint);color:var(--mint-ink)}
.sync-badge.pending{background:var(--sky);color:var(--sky-ink)}
.sync-badge.stale,.sync-badge.unlinked{background:var(--sun);color:var(--sun-ink)}
.link-panel{display:grid;gap:9px}
.link-state{border-radius:14px;padding:13px 15px;border:1px solid}
.link-state.ok{background:var(--mint);border-color:#bfe9da;color:var(--mint-ink)}
.link-state strong{display:block}
.link-state span{display:block;font-size:.83rem;margin-top:4px;opacity:.85}

/* ---------- web app additions ---------- */
.pin-block{margin-top:20px}
.profile-card.chosen{border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-soft)}
body.busy .primary-btn,body.busy .secondary-btn,body.busy .choice-btn,body.busy .keypad button{opacity:.55;pointer-events:none}
.who{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.8);border:1px solid var(--border);border-radius:16px;padding:8px 14px 8px 8px}
.answer-block{margin-top:4px}

.version-bar{text-align:center;padding:18px 12px 26px;font-size:.72rem;color:var(--muted);opacity:.75;letter-spacing:.02em}

/* ---------- placement ---------- */
.place{background:linear-gradient(145deg,var(--sky),#fff);border:1px solid #c6e5f6;border-radius:20px;padding:15px 16px;margin:18px 0 12px}
.place-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.place-head strong{font-size:1rem}
.place-head span{font-size:.8rem;color:var(--sky-ink);font-weight:800}
.place-track{height:9px;background:#fff;border:1px solid #c6e5f6;border-radius:99px;overflow:hidden;margin:11px 0 8px}
.place-bar{height:100%;background:linear-gradient(90deg,#4d90c4,#7bbde8);border-radius:99px;transition:width .4s}
.place-note{display:block;font-size:.8rem;color:var(--sky-ink);line-height:1.45;opacity:.9}
.keypad .key-enter{background:linear-gradient(135deg,var(--primary),#7c6eec);color:#fff;font-size:1.05rem;border:none;grid-column:span 2}
.keypad.with-frac .key-enter{grid-column:span 1}
.keypad .key-frac{background:var(--mint);color:var(--mint-ink);border-color:#bfe9da}

/* ---------- worked solution ---------- */
.solution-box{background:#f7fbff;border:1px solid #cfe3f5;border-radius:20px;padding:16px 17px;margin-top:14px}
.solution-box h3{margin:0 0 12px;font-size:.72rem;text-transform:uppercase;letter-spacing:.11em;color:var(--sky-ink)}
.sol-step{display:grid;grid-template-columns:26px 1fr;gap:11px;align-items:start;margin-bottom:9px}
.sol-step:last-child{margin-bottom:0}
.sol-step span{width:24px;height:24px;border-radius:8px;background:#dceaf7;color:var(--sky-ink);display:grid;place-items:center;font-weight:900;font-size:.78rem;margin-top:1px}
.sol-step p{margin:0;line-height:1.5;font-weight:650}
.sol-step:last-child p{font-weight:850}

/* ---------- graduated hints ---------- */
.hint-line{display:grid;grid-template-columns:22px 1fr;gap:10px;align-items:start;margin-bottom:8px;line-height:1.45}
.hint-line:last-child{margin-bottom:0}
.hint-line span{width:20px;height:20px;border-radius:7px;background:rgba(0,0,0,.09);display:grid;place-items:center;font-size:.68rem;font-weight:900;margin-top:2px}

/* ---------- a little celebration, younger learners only ---------- */
.burst{position:fixed;inset:0;pointer-events:none;z-index:60;display:grid;place-items:center}
.burst i{position:absolute;width:9px;height:9px;border-radius:2px;animation:fly 1.1s ease-out forwards;animation-delay:var(--d)}
@keyframes fly{0%{transform:translate(0,0) rotate(0);opacity:1}100%{transform:translate(var(--x),-160px) rotate(320deg);opacity:0}}
body.fun .question-prompt{letter-spacing:-.02em}
body.fun .hero-icon{animation:bob 3s ease-in-out infinite}
@keyframes bob{0%,100%{transform:rotate(-3deg) translateY(0)}50%{transform:rotate(-3deg) translateY(-5px)}}
@media(prefers-reduced-motion:reduce){.burst{display:none}body.fun .hero-icon{animation:none}}
.notice.secure-note{background:var(--mint);border-color:#bfe9da;color:var(--mint-ink);font-weight:850}

/* ---------- teach me ---------- */
.help-btn{grid-column:1/-1;background:var(--sun);color:var(--sun-ink);border:1px solid #f0dda6;border-radius:16px;min-height:48px;font-weight:800;font-size:.92rem}
.teach-idea{background:#f6f5fd;border:1px solid var(--primary-line);border-radius:18px;padding:16px 17px;font-size:1rem;line-height:1.6;font-weight:650;margin-bottom:16px}
.teach-method-title{font-size:.7rem;text-transform:uppercase;letter-spacing:.11em;color:var(--primary-dark);font-weight:850;margin-bottom:9px}
.rescue-note{background:var(--mint);border:1px solid #bfe9da;color:var(--mint-ink);border-radius:16px;padding:13px 15px;margin-top:13px;font-weight:750;line-height:1.5}
#screen-teaching .question-prompt{font-size:clamp(1.7rem,7vw,2.8rem)}
.stop-note{background:var(--sun);border:1px solid #f0dda6;color:var(--sun-ink);border-radius:16px;padding:13px 15px;margin:14px 0 4px;font-weight:750;line-height:1.5}
.repair-note{background:var(--sky);border:1px solid #c6e5f6;color:var(--sky-ink);border-radius:16px;padding:13px 15px;margin-top:13px;font-weight:750;line-height:1.5}
.micro-nudge{background:var(--sky);border:1px solid #c6e5f6;color:var(--sky-ink);border-radius:16px;padding:13px 15px;margin:14px 0 4px;font-weight:800;line-height:1.5}

/* ==========================================================================
   Senior variant — Grade 7 and up

   Same architecture, same interaction model, same violet identity. What
   changes is the register: cooler, flatter, less rounded, less decorated.
   A thirteen-year-old should feel she is using a study tool, not a children's
   learning game, and that judgement should not wait until she says so.
   ========================================================================== */
body.senior{
  --bg:#f4f5f9;
  --ink:#1e2536;--muted:#69708a;
  --primary-soft:#eceef8;--primary-line:#d6daec;--border:#e2e5ef;
  --shadow:0 10px 34px rgba(35,42,68,.07);--shadow-soft:0 4px 14px rgba(35,42,68,.05);
  background:linear-gradient(180deg,#f6f7fb,#f1f3f9);   /* no colour washes */
}
body.senior .card{border-radius:16px;border-color:#e2e5ef;background:#fff}
body.senior .card:after{display:none}                   /* no decorative disc */
body.senior .hero-wrap{grid-template-columns:1fr;gap:0}
body.senior .hero-icon{display:none}                    /* editorial, not illustrated */
body.senior h2{font-size:clamp(1.35rem,4vw,1.75rem);letter-spacing:-.02em;font-weight:800}
body.senior .welcome-kicker{background:none;padding:0;color:var(--muted);
  font-size:.7rem;text-transform:uppercase;letter-spacing:.13em;font-weight:800}
body.senior .question-card{background:#fff;border-radius:14px;border-color:#e4e7f1;
  padding:clamp(24px,6vw,40px) clamp(16px,4vw,28px)}
body.senior .skill-pill{background:none;color:var(--muted);padding:0;
  font-size:.72rem;text-transform:uppercase;letter-spacing:.11em}
body.senior .question-prompt{font-weight:750;letter-spacing:-.02em}
body.senior .primary-btn{background:var(--primary);box-shadow:none;border-radius:12px}
body.senior .secondary-btn,body.senior .ghost-btn,body.senior .choice-btn{border-radius:12px;box-shadow:none}
/* The submit key must stay the most obvious thing on the keypad. Flattening
   every key swallowed it, which is a usability regression dressed as taste. */
body.senior .keypad button:not(.key-enter){border-radius:12px;box-shadow:none;font-weight:650;background:#fbfcfe}
body.senior .key-enter{border-radius:12px;box-shadow:none;background:var(--primary);color:#fff;font-weight:800}
body.senior .key-minus{background:#eef1f8;color:var(--primary-dark);border-color:#dde2ee}
body.senior .answer-display{border-radius:12px;border-style:solid;border-color:#dfe3ee;font-weight:700}
body.senior .today,body.senior .focus,body.senior .place{border-radius:14px;background:#fbfcfe;
  border-color:#e2e5ef;background-image:none}
body.senior .journey-cell,body.senior .summary-chip,body.senior .mastery-row,
body.senior .strategy-step,body.senior .sol-step span{border-radius:10px}
body.senior .worked-example{border-radius:12px}
body.senior .hero-copy p,body.senior .focus-note{color:var(--muted)}
/* quieter success: a statement of fact, not a fanfare */
body.senior .feedback-box.good{background:#eef4f1;border-color:#d3e3db;color:#2c5a4a;font-weight:700}
body.senior .notice.secure-note{background:#eef4f1;border-color:#d3e3db;color:#2c5a4a}
body.senior .burst{display:none}
/* more air between things */
body.senior .app-shell{padding-top:22px}
body.senior .card{padding:clamp(24px,5vw,40px)}
body.senior .today{margin:22px 0 14px}

/* ---------- why this question / pause ---------- */
.meta-row{display:flex;justify-content:space-between;gap:12px;margin-top:12px}
.link-btn{background:none;border:none;color:var(--muted);font-size:.82rem;font-weight:750;
  text-decoration:underline;text-underline-offset:3px;padding:8px 2px;min-height:40px}
.link-btn:hover{color:var(--primary-dark)}
.why-box{background:#f7f7fc;border:1px solid var(--border);border-radius:14px;
  padding:13px 15px;margin-top:8px;font-size:.9rem;line-height:1.55;color:var(--ink)}
/* long prompts break onto their own lines instead of shrinking */
.question-prompt.lines{white-space:pre-line;font-size:clamp(1.25rem,5vw,1.8rem);line-height:1.4;text-align:left}

/* ---------- teach mode reads as a different place ---------- */
body.teaching-mode{background:linear-gradient(180deg,#eef5fb,#f4f8fc)}
body.teaching-mode .card{border-color:#cfe1f0;box-shadow:0 12px 40px rgba(35,72,110,.10)}
body.teaching-mode .card:after{background:#e3eff8}
.teach-badge{display:inline-block;background:#dceaf6;color:#2f6386;border-radius:999px;
  padding:6px 13px;font-size:.7rem;font-weight:850;letter-spacing:.09em;text-transform:uppercase;margin-bottom:14px}
body.senior .teach-badge{background:none;padding:0;color:var(--muted)}
/* quieter, but still findable */
body.senior .help-btn{background:#f6f7fb;color:var(--primary-dark);border-color:#e2e5ef;font-weight:750}
body.senior .link-btn{text-decoration:none;border-bottom:1px solid var(--border)}
.paused-note{background:var(--mint);border:1px solid #bfe9da;color:var(--mint-ink);border-radius:14px;padding:13px 15px;margin-bottom:10px;font-weight:750;line-height:1.5}

/* ---------- the card turns from a test into a lesson ---------- */
#screen-question.learning .question-card{background:#fff;border-color:var(--border)}
#screen-question.learning .question-prompt{font-size:clamp(1.5rem,6vw,2.2rem);margin-top:10px;color:var(--muted)}
#screen-question.learning .skill-pill{display:none}
.learn-head{margin:0 0 4px;font-size:.72rem;text-transform:uppercase;letter-spacing:.12em;color:var(--primary);font-weight:850}
.answer-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
.answer-pair .pair{border-radius:14px;padding:11px 12px;text-align:center;border:1px solid}
.answer-pair .pair span{display:block;font-size:.66rem;text-transform:uppercase;letter-spacing:.09em;font-weight:850;opacity:.75}
.answer-pair .pair strong{display:block;font-size:1.45rem;margin-top:4px;line-height:1.15}
.answer-pair .mine{background:var(--coral);border-color:#f0c9c4;color:var(--coral-ink)}
.answer-pair .right{background:var(--mint);border-color:#bfe9da;color:var(--mint-ink)}
.teach-transfer{background:var(--sky);border:1px solid #c6e5f6;color:var(--sky-ink);border-radius:16px;padding:13px 15px;margin-bottom:14px;font-weight:750;line-height:1.5}
body.senior .answer-pair .pair strong{font-size:1.25rem}

/* ---------- interactive lesson steps ---------- */
.guided{background:#f6f5fd;border:1px solid var(--primary-line);border-radius:20px;padding:17px 18px;margin-bottom:16px}
.guided-count{display:block;font-size:.66rem;text-transform:uppercase;letter-spacing:.11em;color:var(--primary-dark);font-weight:850}
.guided-prompt{margin:8px 0 0;font-size:clamp(1.2rem,5vw,1.7rem);line-height:1.25;letter-spacing:-.02em}
.guided .choice-grid{grid-template-columns:1fr;margin-top:14px}
.guided .choice-btn{text-align:left;font-size:.95rem;min-height:52px}
.answer-pair .invite{background:var(--primary-soft);border-color:var(--primary-line);color:var(--primary-dark)}
.answer-pair .invite strong{font-size:1rem;margin-top:6px}
.sol-step em.why{display:block;font-style:normal;font-weight:650;color:var(--muted);font-size:.86rem;margin-top:4px;line-height:1.45}
.sol-answer{margin-top:12px;padding-top:11px;border-top:1px solid #cfe3f5;font-weight:800;color:var(--sky-ink)}
.pw-wrap{position:relative}
.pw-wrap .text-input{padding-right:74px}
.pw-eye{position:absolute;right:8px;top:50%;transform:translateY(-50%);background:var(--primary-soft);color:var(--primary-dark);border:1px solid var(--primary-line);border-radius:11px;padding:8px 12px;font-size:.8rem;font-weight:800}
.gate-admin{margin-top:20px;border-top:1px solid var(--border);padding-top:14px}
.gate-admin summary{font-weight:850;cursor:pointer;color:var(--primary-dark);padding:6px 0}