:root{--bg: #0f1226;--bg-2: #171a35;--card: #1e2245;--card-hi: #262b58;--text: #eef0ff;--muted: #9aa0d0;--accent: #7c5cff;--accent-2: #22d3ee;--ok: #34d399;--bad: #fb7185;--line: #2c3163;--radius: 16px;--shadow: 0 12px 40px rgba(0, 0, 0, .4);color-scheme:dark}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:Segoe UI,system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;color:var(--text);background:radial-gradient(1200px 600px at 80% -10%,rgba(124,92,255,.25),transparent 60%),radial-gradient(900px 500px at -10% 110%,rgba(34,211,238,.18),transparent 55%),var(--bg)}.app{min-height:100%;display:flex;flex-direction:column;max-width:720px;margin:0 auto;padding:0 16px 48px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:18px 4px;position:sticky;top:0;background:linear-gradient(var(--bg),rgba(15,18,38,.6));-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:5}.brand{margin:0;font-size:1.6rem;font-weight:800;letter-spacing:.5px;cursor:pointer;-webkit-user-select:none;user-select:none}.brand span{color:var(--accent-2)}.topbar-actions{display:flex;align-items:center;gap:10px}.streak{font-weight:700;font-size:.95rem;color:var(--muted)}.badge{display:inline-block;min-width:20px;padding:1px 6px;border-radius:999px;background:var(--accent);color:#fff;font-size:.8rem;text-align:center}button{font:inherit;cursor:pointer;border:none;border-radius:12px}.primary-btn{background:linear-gradient(135deg,var(--accent),#a67bff);color:#fff;padding:12px 20px;font-weight:700;box-shadow:0 8px 20px #7c5cff59;transition:transform .08s ease,filter .15s ease}.primary-btn:hover{filter:brightness(1.08)}.primary-btn:active{transform:translateY(1px) scale(.99)}.primary-btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.secondary-btn{background:var(--card-hi);color:var(--text);padding:12px 18px;font-weight:600;border:1px solid var(--line)}.ghost-btn{background:transparent;color:var(--text);border:1px solid var(--line);padding:8px 12px;font-weight:600;display:inline-flex;gap:6px;align-items:center}.link-btn{background:none;color:var(--muted);padding:8px 2px;text-decoration:underline}.link-btn.back{align-self:flex-start}.icon-btn{background:none;color:var(--muted);font-size:1.1rem;padding:6px 10px}.content{flex:1;display:flex;flex-direction:column}.muted{color:var(--muted)}.map-head h2{margin:8px 0 2px}.level-grid{list-style:none;padding:0;margin:18px 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}.level-card{width:100%;min-height:128px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px;display:flex;flex-direction:column;align-items:flex-start;gap:8px;text-align:left;color:var(--text);transition:transform .1s ease,border-color .15s ease,box-shadow .15s ease}.level-card:not(:disabled):hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--shadow)}.level-card:disabled{opacity:.5;cursor:not-allowed}.level-card.completed{border-color:#34d3998c}.level-index{font-size:1.5rem;font-weight:800;color:var(--accent-2)}.tier-badge{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:3px 8px;border-radius:999px;background:var(--card-hi);color:var(--muted)}.tier-single{color:#a5f3fc}.tier-dual{color:#fcd34d}.tier-sentence{color:#f0abfc}.level-status{font-weight:700;margin-top:auto}.teaches{font-size:.78rem;color:var(--muted)}.play{display:flex;flex-direction:column;gap:18px;padding-top:8px}.riddle{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 20px;text-align:center;box-shadow:var(--shadow)}.riddle-label{text-transform:uppercase;letter-spacing:2px;font-size:.72rem;color:var(--muted)}.riddle-expr{font-size:clamp(1.6rem,6vw,2.6rem);font-weight:800;margin:10px 0 0}.riddle-expr .fx-headword{background:linear-gradient(135deg,#fff,var(--accent-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.fx-stack{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle}.fx-sep{vertical-align:middle}.fx-emojis{display:grid;grid-template-columns:1fr auto 1fr;align-self:stretch;line-height:1.4}.fx-zone{display:flex;gap:.15em;align-items:flex-end}.fx-zone.fx-left{justify-content:flex-start}.fx-zone.fx-center{justify-content:center}.fx-zone.fx-right{justify-content:flex-end}.fx-emoji{font-size:.75em}.fx-emoji.fx-small{font-size:.55em}.fx-emoji.fx-large{font-size:1em}.fx-emoji.fx-flip{display:inline-block;transform:rotate(180deg)}.fx-emoji.learned{cursor:help}.answer-form{display:flex;gap:10px;flex-wrap:wrap}.answer-input{flex:1;min-width:0;padding:14px 16px;font-size:1.1rem;border-radius:12px;border:2px solid var(--line);background:var(--bg-2);color:var(--text);outline:none;transition:border-color .15s ease}.answer-input:focus{border-color:var(--accent)}.answer-input.ok{border-color:var(--ok)}.answer-input.bad{border-color:var(--bad);animation:shake .4s ease}.feedback{border-radius:var(--radius);padding:18px;border:1px solid var(--line);animation:pop .28s ease}.feedback.correct{background:#34d3991f;border-color:#34d39980}.feedback.incorrect{background:#fb71851a;border-color:#fb718573}.feedback-title{margin:0;font-size:1.25rem;font-weight:800}.feedback-note{color:var(--muted);margin:6px 0 0}.feedback-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}.examples-panel{background:var(--card);border:1px dashed var(--line);border-radius:var(--radius);padding:14px 18px}.examples-label{text-transform:uppercase;letter-spacing:2px;font-size:.7rem;color:var(--muted)}.examples{list-style:none;margin:8px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}.example{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;font-size:1.15rem;font-weight:700;animation:pop .28s ease}.example .answer{color:var(--accent-2)}.example .fx-stack{vertical-align:baseline}.masked-hint{font-family:Consolas,Courier New,monospace;font-size:1.6rem;letter-spacing:6px;text-align:center;margin:0;color:var(--accent-2);animation:pop .28s ease}.hint-mask{font-family:Consolas,Courier New,monospace;font-size:1.5rem;letter-spacing:2px;text-align:center;margin:0;color:var(--accent-2);overflow-wrap:anywhere;animation:pop .28s ease}.hint-mask.solution{color:var(--ok, #3fb950)}.answer-input.autofilled{animation:pop .5s ease;border-color:var(--accent-2)}.try-again{margin:0;animation:pop .2s ease}.rule-reveal .rule-line{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;font-size:1.5rem;font-weight:800;margin:12px 0;animation:pop .4s ease}.rule-reveal .rule-label{color:var(--accent-2)}.rule-reveal .rule-meaning{color:var(--text)}.tutorial-card{background:var(--card);border:1px solid var(--accent);border-radius:var(--radius);padding:26px 20px;text-align:center;box-shadow:var(--shadow);animation:pop .28s ease}.tutorial-tag{display:inline-block;background:var(--accent);color:#fff;font-weight:700;font-size:.75rem;text-transform:uppercase;letter-spacing:1px;padding:4px 10px;border-radius:999px}.tutorial-example{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;font-size:clamp(1.3rem,5vw,2rem);font-weight:800;margin:18px 0 8px}.tutorial-example .answer{color:var(--accent-2)}.expr-arrow,.rule-arrow{color:var(--muted)}.tutorial-meaning{color:var(--muted);font-size:1.05rem;margin:0 0 18px}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0608148c;display:flex;justify-content:flex-end;z-index:20;animation:fade .15s ease}.notebook{width:min(360px,90vw);height:100%;background:var(--bg-2);border-left:1px solid var(--line);padding:20px;overflow-y:auto;animation:slide-in .22s ease}.notebook-head{display:flex;align-items:center;justify-content:space-between}.rules{list-style:none;padding:0;margin:14px 0 0;display:flex;flex-direction:column;gap:10px}.rule{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px}.rule-label{font-weight:800;color:var(--accent-2)}.rule-meaning{color:var(--muted)}.error-screen{padding-top:40px}.error-screen li{color:var(--bad)}.status-screen{min-height:70vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;padding:0 20px}.status-screen h1{margin:0;font-size:1.5rem}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-5px)}80%{transform:translate(5px)}}@keyframes pop{0%{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}@keyframes fade{0%{opacity:0}to{opacity:1}}@keyframes slide-in{0%{transform:translate(30px);opacity:.4}to{transform:translate(0);opacity:1}}@media(max-width:480px){.level-grid{grid-template-columns:repeat(2,1fr)}.play{gap:10px;padding-top:4px}.riddle{padding:12px}.riddle-expr{font-size:clamp(1.15rem,6.5vw,1.6rem);margin-top:6px}.examples-panel{padding:10px 12px}.examples{gap:5px;max-height:32dvh;overflow-y:auto}.example{font-size:.98rem}.masked-hint{font-size:1.15rem;letter-spacing:4px}.hint-mask{font-size:1.1rem;letter-spacing:1px}.answer-input{padding:10px 12px;font-size:1rem}.feedback{padding:12px}.feedback-actions{margin-top:10px}.topbar{padding:8px 4px}.brand{font-size:1.25rem}}