:root{
  --bg:#eef3f7;
  --bg-2:#f8fafc;
  --surface:#ffffff;
  --surface-soft:#f5f8fb;
  --ink:#172233;
  --muted:#667489;
  --faint:#8b98aa;
  --line:#dbe2ea;
  --line-strong:#c9d3df;
  --brand:#28476b;
  --brand-2:#416991;
  --brand-dark:#1d334d;
  --danger:#b42318;
  --success:#187044;
  --warning:#9a5b00;

  --level-1:#f3cd68;
  --level-2:#9fd18b;
  --level-3:#83c3ea;
  --level-4:#bea5ea;

  --language:#f0b45d;
  --math:#72b7e8;
  --science:#89c779;
  --culture:#b49be8;

  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:24px;
  --radius-xl:32px;

  --shadow-sm:0 1px 2px rgba(23,34,51,.06),0 6px 18px rgba(23,34,51,.06);
  --shadow-md:0 12px 36px rgba(23,34,51,.12);
  --shadow-lg:0 24px 80px rgba(23,34,51,.24);

  --font-display:'Bricolage Grotesque',system-ui,sans-serif;
  --font-body:'Inter',system-ui,sans-serif;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  min-height:100vh;
  font-family:var(--font-body);
  color:var(--ink);
  background:
    radial-gradient(circle at top left, rgba(131,195,234,.42), transparent 32rem),
    radial-gradient(circle at bottom right, rgba(190,165,234,.34), transparent 28rem),
    linear-gradient(180deg,var(--bg-2),var(--bg));
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background-image:linear-gradient(rgba(40,71,107,.035) 1px, transparent 1px),linear-gradient(90deg, rgba(40,71,107,.035) 1px, transparent 1px);
  background-size:44px 44px;
  mask-image:linear-gradient(to bottom, black, transparent 72%);
}
button{font:inherit}
:focus-visible{outline:3px solid rgba(40,71,107,.9);outline-offset:3px;border-radius:10px}

.app-shell{position:relative;max-width:920px;margin:0 auto;padding:24px clamp(14px,4vw,34px) 56px}
.app-header{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px;margin-bottom:26px}
.brand-block{grid-column:2;display:flex;align-items:center;gap:12px;justify-self:center}
.brand-mark{width:48px;height:48px;border-radius:16px;background:linear-gradient(145deg,var(--brand),var(--brand-2));color:white;display:grid;place-items:center;font-family:var(--font-display);font-weight:800;font-size:1.35rem;box-shadow:var(--shadow-sm)}
h1{font-family:var(--font-display);font-weight:800;letter-spacing:-.035em;font-size:clamp(1.75rem,5vw,2.35rem);line-height:.95;margin:0}
.brand-block p{margin:4px 0 0;color:var(--muted);font-weight:600;font-size:.92rem}
.header-actions{justify-self:end;display:flex;gap:8px}
.back-link{justify-self:start;appearance:none;background:rgba(255,255,255,.72);border:1px solid var(--line);border-radius:999px;color:var(--brand);font-weight:800;padding:11px 16px;cursor:pointer;box-shadow:var(--shadow-sm)}
.icon-button{appearance:none;border:1px solid var(--line);background:rgba(255,255,255,.78);color:var(--ink);border-radius:14px;min-width:46px;min-height:46px;padding:0 12px;cursor:pointer;display:inline-grid;place-items:center;box-shadow:var(--shadow-sm)}
.icon-button[aria-pressed="false"]{opacity:.48}.icon-button:hover,.back-link:hover{border-color:var(--brand)}

.screen{animation:screenIn .22s ease both}@keyframes screenIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.is-hidden{display:none!important}
.screen-intro{margin:34px auto 18px;text-align:center}.screen-intro.compact{margin-top:12px}
.eyebrow{text-transform:uppercase;letter-spacing:.13em;color:var(--muted);font-size:.74rem;font-weight:800;margin:0 0 8px}
.screen-intro h2{font-family:var(--font-display);font-size:clamp(2rem,7vw,4rem);line-height:.95;letter-spacing:-.045em;margin:0}
.subject-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:22px}
.subject-card{position:relative;overflow:hidden;text-align:left;appearance:none;border:1px solid rgba(255,255,255,.78);border-radius:var(--radius-lg);background:rgba(255,255,255,.82);box-shadow:var(--shadow-sm);padding:22px;min-height:176px;cursor:pointer;display:flex;flex-direction:column;justify-content:space-between;isolation:isolate;transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease}
.subject-card::before{content:"";position:absolute;inset:-40% -20% auto auto;width:180px;height:180px;border-radius:999px;background:color-mix(in srgb, var(--subject-color) 42%, transparent);z-index:-1;filter:blur(2px)}
.subject-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:color-mix(in srgb,var(--subject-color) 45%,white)}
.subject-card .emoji{font-size:2.25rem;line-height:1}.subject-card h3{font-family:var(--font-display);font-size:1.55rem;letter-spacing:-.025em;margin:14px 0 5px}.subject-card p{color:var(--muted);font-size:.95rem;line-height:1.38;margin:0}.card-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.chip{display:inline-flex;align-items:center;border:1px solid var(--line);background:rgba(255,255,255,.72);border-radius:999px;padding:6px 10px;color:var(--muted);font-weight:800;font-size:.78rem}.stripe{height:7px;border-radius:999px;display:flex;overflow:hidden;margin-top:18px}.stripe i{flex:1}

.game-card{background:rgba(255,255,255,.86);border:1px solid rgba(255,255,255,.86);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);padding:clamp(14px,3vw,28px);backdrop-filter:blur(10px)}
.game-topline{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:16px}.game-topline h2{font-family:var(--font-display);font-size:clamp(1.5rem,4vw,2.25rem);letter-spacing:-.035em;margin:0}.attempt-card{background:var(--surface-soft);border:1px solid var(--line);border-radius:18px;padding:10px 12px;display:flex;align-items:center;gap:10px;color:var(--muted);font-weight:800;font-size:.82rem;white-space:nowrap}.attempt-dots{display:flex;gap:5px}.dot{width:12px;height:12px;border-radius:99px;background:var(--brand);transition:transform .2s ease,background .2s ease}.dot.used{background:var(--line-strong);transform:scale(.72)}
.solved-list{display:flex;flex-direction:column;gap:10px;margin-bottom:12px}.solved-group{border-radius:18px;padding:14px 16px;text-align:center;color:var(--ink);box-shadow:var(--shadow-sm);animation:solvedIn .38s cubic-bezier(.2,.8,.2,1) both}@keyframes solvedIn{0%{opacity:0;transform:scale(.97) translateY(8px)}70%{transform:scale(1.01)}100%{opacity:1;transform:none}}.solved-group strong{display:block;font-family:var(--font-display);font-weight:800;text-transform:uppercase;letter-spacing:.04em;font-size:1rem}.solved-group span{display:block;margin-top:3px;font-weight:700}.solved-group small{display:block;margin-top:7px;color:rgba(23,34,51,.7);font-weight:600;line-height:1.35}
.board-wrap{background:linear-gradient(180deg,#f8fafc,#eef3f7);border:1px solid var(--line);border-radius:24px;padding:12px}.tile-grid{display:grid;gap:10px}.tile{appearance:none;border:1px solid var(--line);background:var(--surface);border-radius:16px;min-height:72px;padding:8px 6px;display:flex;align-items:center;justify-content:center;text-align:center;line-height:1.08;color:var(--ink);font-weight:800;font-size:clamp(.86rem,2.8vw,1.05rem);cursor:pointer;word-break:break-word;hyphens:auto;box-shadow:0 1px 0 rgba(255,255,255,.9) inset,0 1px 2px rgba(23,34,51,.04);transition:transform .12s ease,background .12s ease,border-color .12s ease,box-shadow .12s ease}.tile:hover{border-color:var(--brand-2);box-shadow:var(--shadow-sm)}.tile.selected{background:linear-gradient(145deg,var(--brand),var(--brand-2));color:white;border-color:var(--brand);transform:translateY(-2px) scale(1.015)}.tile.shake{animation:shake .42s ease}.tile.pop{animation:pop .34s ease}@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-6px)}40%{transform:translateX(6px)}60%{transform:translateX(-4px)}80%{transform:translateX(4px)}}@keyframes pop{50%{transform:scale(1.07)}}
.fraction{display:inline-flex;flex-direction:column;align-items:center;line-height:1}.fraction .top,.fraction .bottom{padding:0 4px}.fraction .bar{width:100%;height:2px;background:currentColor;margin:2px 0}
.feedback{margin:14px 0;min-height:70px;border:1px solid var(--line);background:rgba(255,255,255,.76);border-radius:20px;padding:14px 16px;display:flex;align-items:flex-start;gap:12px}.feedback-icon{width:28px;height:28px;border-radius:999px;background:var(--brand);color:white;display:grid;place-items:center;font-weight:900;flex:0 0 auto}.feedback strong{display:block}.feedback p{margin:3px 0 0;color:var(--muted);line-height:1.35}.feedback.good{border-color:rgba(24,112,68,.25);background:rgba(24,112,68,.08)}.feedback.good .feedback-icon{background:var(--success)}.feedback.bad{border-color:rgba(180,35,24,.25);background:rgba(180,35,24,.07)}.feedback.bad .feedback-icon{background:var(--danger)}.feedback.warn{border-color:rgba(154,91,0,.25);background:rgba(154,91,0,.08)}.feedback.warn .feedback-icon{background:var(--warning)}
.controls{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}.button{appearance:none;border:1.5px solid var(--line-strong);border-radius:999px;min-height:48px;padding:0 22px;font-weight:900;cursor:pointer;transition:transform .12s ease,box-shadow .12s ease,background .12s ease}.button:hover{transform:translateY(-1px);box-shadow:var(--shadow-sm)}.button.primary{background:linear-gradient(145deg,var(--brand),var(--brand-2));border-color:var(--brand);color:white}.button.primary:disabled{background:var(--line-strong);border-color:var(--line-strong);color:white;cursor:default;transform:none;box-shadow:none}.button.secondary{background:rgba(255,255,255,.78);color:var(--ink)}
.overlay{position:fixed;inset:0;background:rgba(23,34,51,.48);display:grid;place-items:center;padding:20px;z-index:10;animation:screenIn .18s ease both}.result-panel{width:min(420px,100%);background:var(--surface);border-radius:30px;box-shadow:var(--shadow-lg);padding:28px;text-align:center;animation:panelIn .28s cubic-bezier(.2,.8,.2,1) both}@keyframes panelIn{from{opacity:0;transform:scale(.95)}to{opacity:1;transform:none}}.result-emoji{font-size:3.2rem}.result-panel h2{font-family:var(--font-display);font-size:2rem;letter-spacing:-.035em;margin:4px 0}.result-panel p{margin:0 0 18px;color:var(--muted);line-height:1.45}.score-card{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.score-card>div{border:1px solid var(--line);border-radius:18px;background:var(--surface-soft);padding:14px}.score-label{display:block;color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;font-weight:900;margin-bottom:4px}.score-card strong{font-size:1.3rem}.panel-actions{display:flex;flex-direction:column;gap:10px}
body.reduced-motion *,body.reduced-motion *::before,body.reduced-motion *::after{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important}


.learning-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:10px 0 22px}
.learning-stat{background:rgba(255,255,255,.72);border:1px solid var(--line);border-radius:18px;padding:14px;text-align:center;box-shadow:var(--shadow-sm)}
.learning-stat strong{display:block;font-family:var(--font-display);font-size:1.25rem;letter-spacing:-.02em}.learning-stat span{display:block;margin-top:3px;color:var(--muted);font-size:.78rem;font-weight:900;text-transform:uppercase;letter-spacing:.08em}
.progress-row{display:flex;align-items:center;gap:10px;margin-top:8px;color:var(--muted);font-weight:800;font-size:.9rem}.selection-meter{flex:1;display:grid;grid-template-columns:repeat(4,1fr);gap:5px;max-width:150px}.selection-meter i{height:8px;border-radius:999px;background:var(--line)}.selection-meter i.on{background:linear-gradient(145deg,var(--brand),var(--brand-2))}
.tip-box{margin:0 0 14px;border:1px dashed color-mix(in srgb,var(--brand) 34%,var(--line));background:rgba(255,255,255,.54);border-radius:18px;padding:12px 14px;color:var(--muted);font-weight:650;line-height:1.4}.tip-box strong{color:var(--ink)}
.lesson-note{margin:12px 0 0;background:var(--surface-soft);border:1px solid var(--line);border-radius:18px;padding:13px 14px;text-align:left;color:var(--muted);line-height:1.4}.lesson-note strong{display:block;color:var(--ink);margin-bottom:3px}
.button.ghost{background:transparent;color:var(--brand);border-color:transparent}.button.ghost:hover{border-color:var(--line);background:rgba(255,255,255,.64)}
.next-action.is-hidden{display:none!important}
@media (max-width:720px){.learning-strip{grid-template-columns:1fr}.progress-row{width:100%}.selection-meter{max-width:none}.button.ghost{border-color:var(--line);background:rgba(255,255,255,.78)}}

@media (max-width:720px){.app-shell{padding-top:16px}.app-header{grid-template-columns:auto 1fr auto}.brand-block{grid-column:2;justify-self:start}.brand-mark{width:42px;height:42px;border-radius:14px}.back-link{font-size:0;width:44px;height:44px;padding:0}.back-link::before{content:'←';font-size:1rem}.subject-grid{grid-template-columns:1fr}.subject-card{min-height:150px}.game-topline{flex-direction:column}.attempt-card{width:100%;justify-content:space-between}.board-wrap{padding:8px}.tile-grid{gap:8px}.tile{min-height:62px;border-radius:13px}.controls{position:sticky;bottom:10px;background:rgba(238,243,247,.78);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.6);border-radius:22px;padding:8px}.button{flex:1 1 auto;padding:0 14px}.screen-intro{text-align:left;margin-top:20px}.screen-intro h2{font-size:2.6rem}}
@media (max-width:430px){.tile{font-size:.78rem;min-height:56px}.game-card{border-radius:24px;padding:12px}.feedback{font-size:.92rem}.button{font-size:.9rem}}