:root{--bg:#f5f5ff;--card:#fff;--text:#1f2133;--muted:#6b6f85;--primary:#4f46e5;--good:#16a34a;--bad:#dc2626;--almost:#d97706;--gold:#f59e0b;--flame:#f97316;--line:#d4d6e8;--radius:18px;color:var(--text);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:18px}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#14151f;--card:#1f2130;--text:#eceefa;--muted:#9a9db5;--line:#34374d;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--bg:#14151f;--card:#1f2130;--text:#eceefa;--muted:#9a9db5;--line:#34374d;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}.screen{max-width:640px;padding-block:16px 32px;padding-left:max(16px, env(safe-area-inset-left,0px));padding-right:max(16px, env(safe-area-inset-right,0px));flex-direction:column;gap:16px;min-height:100dvh;margin:0 auto;display:flex}.center{text-align:center;justify-content:center}h1{margin:0;font-size:1.6rem}.card{background:var(--card);border-radius:var(--radius);color:inherit;font:inherit;text-align:left;border:none;padding:20px;box-shadow:0 2px 10px #0000000f}.stack{flex-direction:column;gap:14px;display:flex}.row{gap:12px;display:flex}.row>*{flex:1}.bar{justify-content:space-between;align-items:center;gap:12px;display:flex}label{text-align:left;flex-direction:column;gap:6px;font-weight:600;display:flex}input,select,textarea{font:inherit;border:2px solid var(--line);background:var(--card);color:inherit;border-radius:12px;min-height:48px;padding:12px 14px}input:focus,select:focus,textarea:focus{border-color:var(--primary);outline:none}button{font:inherit;cursor:pointer;border:none;border-radius:14px;min-height:48px;padding:12px 18px;font-weight:600}button:disabled{opacity:.5;cursor:default}.primary{background:var(--primary);color:#fff}.good{background:var(--good);color:#fff}.bad{background:var(--bad);color:#fff}.big{min-height:64px;font-size:1.2rem}.link{color:var(--primary);background:0 0;padding:8px 0}.muted{color:var(--muted);font-size:.9rem}.error{color:var(--bad);font-weight:600}fieldset{border:none;margin:0;padding:0}legend{margin-bottom:8px;font-weight:600}.choice{flex-wrap:wrap;gap:8px;display:flex}.choice button{background:var(--bg);color:inherit;border:2px solid #0000;flex:140px}.choice button.on{border-color:var(--primary);color:var(--primary)}.sets{gap:14px;margin:0;padding:0;list-style:none;display:grid}@media (width>=700px){.screen{max-width:900px}.sets{grid-template-columns:1fr 1fr}}.set{flex-direction:column;gap:6px;width:100%;display:flex}.set-name{font-size:1.2rem}.badge{background:var(--primary);color:#fff;border-radius:999px;align-self:flex-start;padding:2px 12px;font-size:.85rem}.badge.done{background:var(--good)}.boxes{gap:8px;margin-top:6px;display:flex}.box{flex-direction:column;flex:1;align-items:center;font-size:.8rem;display:flex}.bar-wrap{background:var(--bg);border-radius:6px;align-items:flex-end;width:100%;height:48px;display:flex;overflow:hidden}.fill{background:var(--primary);width:100%;min-height:2px}.fill.f0{background:var(--muted)}.fill.f5{background:var(--good)}.box .label{color:var(--muted)}.progress{background:var(--card);border-radius:999px;height:8px;overflow:hidden}.progress>div{background:var(--primary);height:100%;transition:width .3s}.feedback{margin:0;font-weight:700}.big-input{text-align:center;font-size:1.4rem}.big-text{font-size:1.4rem;font-weight:700}:focus-visible{outline:3px solid var(--primary);outline-offset:2px}@media (prefers-reduced-motion:reduce){.progress>div{transition:none}}.demo-bar{padding-block:8px;padding-left:max(16px, env(safe-area-inset-left,0px));padding-right:max(16px, env(safe-area-inset-right,0px));background:var(--card);border-bottom:1px solid var(--line);color:var(--muted);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 12px;font-size:.8rem;display:flex}.demo-bar a{color:var(--primary)}.demo-actions{gap:8px;display:flex}.demo-actions button{background:var(--bg);min-height:36px;color:var(--text);padding:6px 12px;font-size:.8rem}.stats{background:var(--card);border-radius:var(--radius);grid-template-columns:repeat(4,1fr);gap:8px;min-height:96px;padding:12px 8px;display:grid;box-shadow:0 2px 10px #0000000f}.stat,.goal{flex-direction:column;justify-content:center;align-items:center;gap:2px;display:flex}.stat-icon{font-size:1.5rem;line-height:1}.stat.streak:not(.lit) .stat-icon{filter:grayscale();opacity:.5}.stat-value{font-variant-numeric:tabular-nums;font-size:1.3rem;font-weight:800}.stat-label{color:var(--muted);font-size:.75rem}.goal svg{width:52px;height:52px}.goal-track{fill:none;stroke:var(--line);stroke-width:7px}.goal-fill{fill:none;stroke:var(--primary);stroke-width:7px;stroke-linecap:round;transition:stroke-dashoffset .6s}.goal.reached .goal-fill{stroke:var(--good)}.goal-text{fill:var(--text);font-variant-numeric:tabular-nums;font-size:13px;font-weight:700}.treasure{color:var(--muted);flex-wrap:wrap;align-items:center;gap:4px 6px;font-size:.85rem;display:flex}.treasure-bar{background:var(--bg);border-radius:999px;flex-basis:100%;height:6px;overflow:hidden}.treasure-bar>span{background:var(--good);height:100%;display:block}.run-xp{font-variant-numeric:tabular-nums;font-weight:700}.flip-scene{perspective:1200px}.flip-card{min-height:260px;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.3,.7,.3,1);display:grid;position:relative}.flip-card.flipped{transform:rotateY(180deg)}.face{backface-visibility:hidden;background:var(--card);border-radius:var(--radius);text-align:center;border:3px solid #0000;flex-direction:column;grid-area:1/1;justify-content:center;align-items:center;gap:10px;min-width:0;padding:28px 20px;display:flex;box-shadow:0 4px 16px #00000014}.face.back{transform:rotateY(180deg)}.face.back.correct{border-color:var(--good)}.face.back.almost{border-color:var(--almost)}.face.back.wrong{border-color:var(--bad)}.word{overflow-wrap:anywhere;text-wrap:balance;margin:0;font-size:2.2rem;font-weight:800}.from-word,.your-answer,.hint{color:var(--muted);margin:0}.from-word{font-size:1.05rem}.hint{font-size:.85rem}.reward{color:var(--gold);margin:0;font-weight:800;animation:.4s pop}.combo{color:var(--flame)}@keyframes pop{0%{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}.confetti{pointer-events:none;z-index:20;width:100%;height:100%;position:fixed;inset:0}.summary-tiles{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.tile{background:var(--card);border-radius:var(--radius);flex-direction:column;flex:90px;align-items:center;gap:2px;max-width:160px;padding:14px 8px;display:flex}.tile-value{font-variant-numeric:tabular-nums;font-size:1.6rem;font-weight:800}.goal-card{text-align:left;align-items:center;gap:14px;display:flex}.note{margin:0;font-weight:600}@media (prefers-reduced-motion:reduce){.flip-card,.goal-fill{transition:none}.reward{animation:none}}.nav-button{text-align:center;padding:14px;font-weight:600}.hint-line{margin:0;font-size:.9rem}label.switch{flex-direction:row;align-items:center;gap:12px}label.switch input{width:1.4rem;height:1.4rem;accent-color:var(--primary)}.board{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.board-row{align-items:center;gap:14px;padding:14px 18px;display:flex}.board-row.me{outline:3px solid var(--primary)}.board-place{text-align:center;min-width:2.2rem;font-size:1.3rem}.board-name{overflow-wrap:anywhere;flex-wrap:wrap;flex:1;align-items:center;gap:8px;min-width:0;font-weight:600;display:flex}.board-value{white-space:nowrap;font-weight:700}.class-badge{background:var(--muted);align-self:center}