/* ==========================================================================
   TestBuddy — Adaptive learning layer (mastery · mascot · rewards · parent)
   --------------------------------------------------------------------------
   Vibrant design language, with all --tb-* tokens tracking the approved Bold Play (Option B)
   theme in design/themes.css.
   Loaded by: index.html, quiz.html (injected), rewards.html, parent.html.
   ========================================================================== */
:root{
  /* TestBuddy "Bold Play" (Option B) - every --tb-* token now tracks design/themes.css */
  --tb-bg:var(--background); --tb-surface:var(--surface); --tb-surface2:var(--surface-2);
  --tb-text:var(--text); --tb-muted:var(--muted); --tb-line:var(--line);
  --tb-primary:var(--primary); --tb-primary-dark:var(--primary-dark); --tb-on-primary:var(--on-primary);
  --tb-accent:var(--accent); --tb-accent-ink:var(--accent-ink); --tb-accent-soft:var(--accent-soft);
  --tb-highlight:var(--highlight); --tb-highlight-ink:var(--highlight-ink); --tb-highlight-soft:var(--highlight-soft);
  --tb-success:var(--success); --tb-success-strong:var(--success-strong); --tb-success-soft:var(--success-soft);
  --tb-danger:var(--danger); --tb-danger-soft:var(--danger-soft);
  --tb-grad-btn:var(--grad-btn); --tb-grad-accent:var(--grad-accent); --tb-grad-hero:var(--grad-hero);
  --tb-shadow:var(--shadow);
  --tb-radius:16px;
  --tb-ease:cubic-bezier(.22,.9,.28,1.2);
}

/* ---------------- Chapter mastery meter (the "filling trail") ---------- */
.tb-mastery{margin-top:10px}
.tb-trail{position:relative;height:16px;background:var(--tb-surface-2);border-radius:999px;overflow:hidden;box-shadow:inset 0 1px 3px rgba(59,20,112,.18)}
.tb-trail .tb-fill{height:100%;width:0;border-radius:999px;background:linear-gradient(90deg,var(--tb-highlight),var(--tb-primary));transition:width .9s var(--tb-ease)}
.tb-trail.tb-mastered .tb-fill{background:linear-gradient(90deg,var(--tb-primary),var(--tb-success))}
.tb-mastery-row{display:flex;align-items:center;gap:10px}
.tb-mastery-row .tb-trail{flex:1}
.tb-pct{font-size:12px;font-weight:800;color:var(--tb-highlight-ink);min-width:38px;text-align:right;font-variant-numeric:tabular-nums}
.tb-mastered .tb-pct{color:var(--tb-primary-dark)}
.tb-star{color:var(--tb-highlight);font-size:18px;line-height:1;filter:drop-shadow(0 2px 3px rgba(251,191,36,.5))}
.tb-mastery-label{font-size:11px;font-weight:700;color:var(--tb-muted);letter-spacing:.06em;text-transform:uppercase}

/* Locked chapter */
.chapter-row.tb-locked{opacity:.85;background:var(--tb-surface-2)}
.chapter-row.tb-locked .btn-start,.tb-lockbtn{pointer-events:none}
.tb-lockbtn{display:inline-flex;align-items:center;gap:8px;background:var(--tb-highlight-soft);color:var(--tb-highlight-ink);border:1px dashed var(--tb-highlight);border-radius:12px;padding:14px 19px;font-weight:700;white-space:nowrap}
.tb-lockmsg{font-size:12px;font-weight:700;color:var(--tb-highlight-ink)}
.tb-shelf-link{margin:18px 0 0;font-size:14px;color:var(--tb-muted)}
.tb-shelf-link a{color:var(--tb-primary-dark);font-weight:800}

/* ---------------- Adaptive toggle (quiz start screen) ------------------ */
.tb-adaptive-block{background:var(--tb-surface2);border:1px solid var(--tb-line);border-radius:var(--tb-radius);padding:16px 18px;margin-bottom:22px}
.tb-toggle-row{display:flex;gap:14px;align-items:flex-start;cursor:pointer}
.tb-toggle{position:relative;flex:0 0 52px;height:30px;margin-top:2px}
.tb-toggle input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}
.tb-toggle .tb-track{position:absolute;inset:0;background:var(--tb-line);border-radius:999px;transition:background .2s}
.tb-toggle .tb-knob{position:absolute;top:3px;left:3px;width:24px;height:24px;border-radius:50%;background:var(--tb-surface);box-shadow:0 2px 6px rgba(0,0,0,.25);transition:left .2s var(--tb-ease)}
.tb-toggle input:checked ~ .tb-track{background:var(--tb-grad-btn)}
.tb-toggle input:checked ~ .tb-knob{left:25px}
.tb-toggle input:focus-visible ~ .tb-track{outline:3px solid var(--tb-highlight);outline-offset:2px}
.tb-adapt-note{font-size:13px;color:var(--tb-muted)}
.tb-adapting{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--tb-primary-dark);padding:6px 0}
.tb-adapting .tb-dots span{display:inline-block;width:8px;height:8px;margin-right:4px;border-radius:50%;background:var(--tb-primary);animation:tb-bounce 1s infinite}
.tb-adapting .tb-dots span:nth-child(2){animation-delay:.15s}
.tb-adapting .tb-dots span:nth-child(3){animation-delay:.3s}
@keyframes tb-bounce{0%,100%{transform:translateY(0);opacity:.6}50%{transform:translateY(-6px);opacity:1}}

/* ---------------- Mascot ------------------------------------------------ */
.tb-mascot-zone{display:flex;gap:14px;align-items:center;background:var(--tb-surface2);border:1px solid var(--tb-line);border-radius:var(--tb-radius);padding:12px 16px;margin-bottom:22px}
.tb-mascot{flex:0 0 auto;animation:tb-bob 3.2s ease-in-out infinite}
@keyframes tb-bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}
.tb-mascot svg{display:block}
.tb-mascot .m-eyes{transform-box:fill-box;transform-origin:center;animation:tb-blink 4.6s infinite}
@keyframes tb-blink{0%,93%,100%{transform:scaleY(1)}96%{transform:scaleY(.08)}}
.tb-mascot[data-mood="celebrate"]{animation:tb-cheer .55s var(--tb-ease) 2}
@keyframes tb-cheer{0%,100%{transform:translateY(0) rotate(0)}30%{transform:translateY(-14px) rotate(-4deg)}60%{transform:translateY(0) rotate(4deg)}}
.tb-mascot[data-mood="celebrate"] .m-wing-l{transform-box:fill-box;transform-origin:top right;animation:tb-wave .55s ease-in-out 2}
.tb-mascot[data-mood="celebrate"] .m-wing-r{transform-box:fill-box;transform-origin:top left;animation:tb-wave .55s ease-in-out 2}
@keyframes tb-wave{0%,100%{transform:rotate(0)}50%{transform:rotate(-32deg)}}
.tb-mascot[data-mood="comfort"]{animation:tb-tilt 2.4s ease-in-out infinite}
@keyframes tb-tilt{0%,100%{transform:rotate(-3deg)}50%{transform:rotate(3deg)}}
/* outfit theming */
.tb-mascot .m-body{fill:var(--tb-primary)}.tb-mascot .m-belly{fill:var(--tb-surface-2)}
.tb-mascot .m-wing{fill:var(--tb-primary-dark)}.tb-mascot .m-beak{fill:var(--tb-highlight)}
.tb-mascot .m-eye-white{fill:var(--tb-surface)}.tb-mascot .m-pupil{fill:var(--tb-text)}.tb-mascot .m-spark{fill:var(--tb-surface)}
.tb-mascot .m-feet{stroke:var(--tb-primary-dark)}
.tb-mascot .m-acc{display:none}
.tb-mascot.tb-outfit-scholar .m-acc-cap{display:block}
.tb-mascot.tb-outfit-star .m-body{fill:var(--tb-highlight)}.tb-mascot .m-acc-star{fill:var(--tb-highlight)}
.tb-mascot.tb-outfit-star .m-acc-star{display:block}
.tb-mascot.tb-outfit-star .m-wing{fill:var(--tb-highlight-ink)}
.tb-mascot.tb-outfit-night .m-body{fill:#2B2D6E}.tb-mascot .m-belly{fill:#3D3F8F}
.tb-mascot.tb-outfit-night .m-wing{fill:#1D1E4E}.tb-mascot .m-eye-white{fill:#FFF7D6}
.tb-speech{position:relative;background:var(--tb-surface);border:2px solid var(--tb-line);border-radius:14px;padding:10px 14px;font-size:15px;font-weight:600;color:var(--tb-text);max-width:420px}
.tb-speech:before{content:"";position:absolute;left:-9px;top:50%;width:14px;height:14px;background:var(--tb-surface);border-left:2px solid var(--tb-line);border-bottom:2px solid var(--tb-line);transform:translateY(-50%) rotate(45deg)}

/* ---------------- Rewards: toast + celebration -------------------------- */
.tb-toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);background:var(--tb-text);color:var(--tb-surface);border-radius:999px;padding:12px 20px;font-weight:700;font-size:14px;box-shadow:var(--tb-shadow);opacity:0;transition:opacity .3s,transform .3s;z-index:9000;pointer-events:none;max-width:calc(100vw - 40px);text-align:center}
.tb-toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.tb-celebrate{background:var(--tb-highlight-soft);border:2px solid var(--tb-highlight);border-radius:var(--tb-radius);padding:20px;margin:24px 0;text-align:center}
.tb-celebrate h3{margin:0 0 6px;font-size:20px;color:var(--tb-highlight-ink)}
.tb-celebrate p{margin:6px 0;color:var(--tb-text)}
.tb-reward-chips{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:12px}
.tb-reward-chip{display:inline-flex;align-items:center;gap:8px;background:var(--tb-surface);border:1px solid var(--tb-line);border-radius:999px;padding:8px 14px;font-weight:800;font-size:14px;color:var(--tb-text)}
.tb-reward-chip svg{width:22px;height:22px}
.tb-unlock{background:var(--tb-success-soft);border:2px dashed var(--tb-success);border-radius:var(--tb-radius);padding:16px 20px;margin:16px 0;font-weight:700;color:var(--tb-success-strong);text-align:center}
.tb-mastery-updates{margin:24px 0}
.tb-mastery-updates h3{font-size:18px;margin:0 0 12px}
.tb-mu-row{display:grid;grid-template-columns:1fr auto;gap:6px 12px;align-items:center;background:var(--tb-surface);border:1px solid var(--tb-line);border-radius:12px;padding:12px 16px;margin-bottom:10px}
.tb-mu-row strong{font-size:15px}
.tb-mu-row .tb-trail{grid-column:1/-1}
.tb-mu-tag{font-size:12px;font-weight:800;color:var(--tb-primary-dark);background:var(--tb-success-soft);border-radius:999px;padding:3px 10px}

/* ---------------- Rewards page: shelf ----------------------------------- */
.tb-shelf-hero{background:var(--tb-grad-hero);color:var(--tb-surface);border-radius:20px;padding:34px;box-shadow:var(--tb-shadow);display:flex;gap:26px;align-items:center;flex-wrap:wrap;margin-bottom:30px}
.tb-shelf-hero h1{margin:0 0 8px;font-size:clamp(28px,4vw,40px);letter-spacing:-.02em}
.tb-shelf-hero p{margin:0;opacity:.85}
.tb-points{display:flex;gap:14px;margin-top:14px;flex-wrap:wrap}
.tb-point{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);border-radius:14px;padding:12px 18px;text-align:center;min-width:120px}
.tb-point b{display:block;font-size:26px}
.tb-point span{font-size:12px;opacity:.8;font-weight:700}
.tb-badge-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px;margin:0 0 34px}
.tb-badge{background:var(--tb-surface);border:2px solid var(--tb-line);border-radius:var(--tb-radius);padding:18px 12px;text-align:center;transition:transform .15s}
.tb-badge.earned{border-color:var(--tb-highlight);box-shadow:var(--tb-shadow)}
.tb-badge.earned:hover{transform:translateY(-3px)}
.tb-badge.locked{opacity:.55;filter:grayscale(.7)}
.tb-badge .tb-bicon{width:52px;height:52px;margin:0 auto 10px;display:grid;place-items:center;border-radius:50%;background:var(--tb-highlight-soft)}
.tb-badge.locked .tb-bicon{background:var(--tb-surface-2)}
.tb-badge .tb-bicon svg{width:30px;height:30px}
.tb-badge b{display:block;font-size:14px;margin-bottom:4px}
.tb-badge small{color:var(--tb-muted);font-size:12px;line-height:1.4;display:block}
.tb-outfit-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;margin-bottom:34px}
.tb-outfit{background:var(--tb-surface);border:2px solid var(--tb-line);border-radius:var(--tb-radius);padding:18px;text-align:center}
.tb-outfit.equipped{border-color:var(--tb-primary);box-shadow:var(--tb-shadow)}
.tb-outfit .tb-mascot{animation:none;margin:0 auto}
.tb-outfit b{display:block;margin:10px 0 4px}
.tb-outfit small{color:var(--tb-muted);font-size:12px;display:block;margin-bottom:12px}
.tb-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:12px 18px;font-weight:800;cursor:pointer;text-decoration:none;background:var(--tb-grad-btn);color:var(--tb-surface);min-height:46px}
.tb-btn.ghost{background:var(--tb-surface);color:var(--tb-text);border:1px solid var(--tb-line)}
.tb-btn:disabled{opacity:.5;cursor:default}

/* ---------------- Parent dashboard -------------------------------------- */
.tb-parent-hero{background:var(--tb-grad-hero);color:var(--tb-surface);border-radius:20px;padding:34px;box-shadow:var(--tb-shadow);margin-bottom:26px}
.tb-parent-hero h1{margin:0 0 8px;font-size:clamp(28px,4vw,40px);letter-spacing:-.02em}
.tb-parent-hero p{margin:0;opacity:.85;max-width:640px}
.tb-link-row{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 26px}
.tb-link-row input{flex:1;min-width:200px;border:1px solid var(--tb-line);border-radius:12px;padding:12px 14px;font:inherit;background:var(--tb-surface)}
.tb-child-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px;margin-bottom:30px}
.tb-child{background:var(--tb-surface);border:1px solid var(--tb-line);border-radius:20px;box-shadow:var(--tb-shadow);padding:22px}
.tb-child h3{margin:0 0 2px;font-size:20px}
.tb-child .tb-sub{font-size:13px;color:var(--tb-muted);margin:0 0 14px}
.tb-mbar{margin-bottom:10px}
.tb-mbar .tb-mbar-top{display:flex;justify-content:space-between;font-size:13px;font-weight:700;margin-bottom:4px}
.tb-mbar .tb-trail{height:10px}
.tb-weak{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.tb-weak-chip{background:var(--tb-danger-soft);color:var(--tb-danger);border-radius:999px;padding:5px 12px;font-size:12px;font-weight:800}
.tb-attempts{margin:12px 0 0;padding:0;list-style:none;font-size:13px;color:var(--tb-muted)}
.tb-attempts li{display:flex;justify-content:space-between;gap:10px;padding:7px 0;border-top:1px dashed var(--tb-line)}
.tb-attempts b{color:var(--tb-text)}
.tb-demo-tag{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--tb-highlight-ink);background:var(--tb-highlight-soft);border:1px dashed var(--tb-highlight);border-radius:999px;padding:4px 12px;margin-bottom:10px}
.tb-upsell{background:var(--tb-surface2);border:2px solid var(--tb-line);border-radius:20px;padding:26px;margin-bottom:30px;display:flex;gap:18px;align-items:center;flex-wrap:wrap;justify-content:space-between}
.tb-upsell h3{margin:0 0 6px}
.tb-upsell p{margin:0;color:var(--tb-muted);max-width:560px}

/* demo-mode notice */
.tb-demo-note{background:var(--tb-surface);border:1px dashed var(--tb-highlight);color:var(--tb-highlight-ink);border-radius:12px;padding:10px 14px;font-size:13px;font-weight:600;margin-bottom:18px}

/* Adaptive API mode: questions come from the server without answer keys
   (answers are graded server-side), so app.js's local "malformed question"
   validator warning is misleading — hide it only in this mode. */
body.tb-adaptive-api .quiz-qwrap .status.error{display:none}

@media(max-width:600px){
  .tb-mascot-zone{flex-direction:column;text-align:center}
  .tb-speech:before{left:50%;top:-9px;transform:translateX(-50%) rotate(135deg)}
  .tb-shelf-hero,.tb-parent-hero{padding:24px}
}
@media(prefers-reduced-motion:reduce){
  .tb-mascot,.tb-mascot .m-eyes,.tb-mascot[data-mood]{animation:none!important}
  .tb-trail .tb-fill{transition:none}
  .tb-adapting .tb-dots span{animation:none}
}

/* Quota-exhausted nudge (HTTP 402 from /api/tests/generate) */
.tb-quota-veil{position:fixed;inset:0;background:rgba(26,16,54,.55);display:flex;align-items:center;justify-content:center;z-index:9999;padding:20px;animation:tb-fade .2s ease}
@keyframes tb-fade{from{opacity:0}to{opacity:1}}
.tb-quota-card{background:var(--tb-surface,#fff);border-radius:20px;max-width:400px;width:100%;padding:30px 28px;text-align:center;box-shadow:0 24px 60px rgba(26,16,54,.35);border-top:6px solid var(--tb-primary,#7C3AED)}
.tb-quota-emoji{font-size:44px;margin-bottom:8px}
.tb-quota-card h3{font-family:Georgia,serif;font-size:24px;margin:0 0 10px;color:var(--tb-ink,#1A1036)}
.tb-quota-card p{font-size:14px;color:var(--tb-muted,#5B5470);margin:0 0 20px}
.tb-quota-card p strong{color:var(--tb-primary,#7C3AED)}
.tb-quota-cta{display:block;background:var(--tb-primary,#7C3AED);color:#fff;font-weight:700;text-decoration:none;border-radius:12px;padding:14px;font-size:16px;margin-bottom:10px}
.tb-quota-cta:hover{background:var(--tb-primary-dark,#5B21B6)}
.tb-quota-close{background:none;border:0;color:var(--tb-muted,#5B5470);font-size:14px;font-weight:600;padding:8px;cursor:pointer}

/* Auth gate veil (quiz.html: shown while session/child is resolving) */
.tb-auth-veil{position:fixed;inset:0;background:var(--tb-paper,#F7F4FF);z-index:9998;display:flex;align-items:center;justify-content:center}
.tb-auth-box{text-align:center;max-width:420px;padding:24px}
.tb-auth-box .tb-auth-spin{font-size:40px;animation:tb-spin 1.2s linear infinite;display:inline-block}
@keyframes tb-spin{to{transform:rotate(360deg)}}
.tb-auth-box h2{font-family:Georgia,serif;font-size:24px;color:var(--tb-ink,#1A1036);margin:14px 0 8px}
.tb-auth-box p{color:var(--tb-muted,#5B5470);font-size:14px}
.tb-child-pick{display:grid;gap:10px;margin:18px 0}
.tb-child-pick button{border:2px solid var(--tb-line,#E7E2F5);background:#fff;border-radius:14px;padding:14px;font-size:16px;font-weight:700;color:var(--tb-ink,#1A1036);cursor:pointer;font-family:inherit}
.tb-child-pick button:hover{border-color:var(--tb-primary,#7C3AED);box-shadow:0 6px 18px rgba(124,58,237,.15)}
.tb-child-pick small{display:block;font-weight:500;color:var(--tb-muted,#5B5470);font-size:12px;margin-top:2px}