:root{--bg: #f6f4ef;--surface: #ffffff;--text: #1f2023;--muted: #6c6a66;--line: #e4e0d8;--accent: #c8102e;--accent-soft: #fbe9eb;--good: #2f7d4f;--good-soft: #e5f2ea;--close: #9a6a00;--close-soft: #fbf1dc;--bad: #b3261e;--bad-soft: #fbe8e6;--radius: 14px;--tabbar: 64px;color-scheme:light}@media(prefers-color-scheme:dark){:root{--bg: #1b1c1e;--surface: #25262a;--text: #ecebe8;--muted: #a19f9a;--line: #36373c;--accent: #ff5c6c;--accent-soft: #3a2327;--good: #6cc68f;--good-soft: #20352a;--close: #e3b34c;--close-soft: #3a3120;--bad: #ff8a80;--bad-soft: #3d2423;color-scheme:dark}}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--text);font:17px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-tap-highlight-color:transparent}a{color:inherit}h1{font-size:1.6rem;line-height:1.2;margin:0}h2{font-size:1rem;margin:0 0 .5rem}p{margin:0 0 .75rem}.muted{color:var(--muted)}.small{font-size:.85rem}.lead{font-size:1.1rem;margin:.5rem 0 1.25rem}.page{max-width:560px;margin:0 auto;padding:calc(16px + env(safe-area-inset-top)) 16px calc(var(--tabbar) + 32px + env(safe-area-inset-bottom))}.page.center{text-align:center;padding-top:25vh}.page-head{display:flex;align-items:center;gap:8px;margin-bottom:16px;min-height:44px}.page-action,.push{margin-left:auto}.back{font-size:2rem;line-height:1;text-decoration:none;padding:0 8px 4px 0}.brand{font-size:2rem;letter-spacing:-.02em}.brand span{color:var(--accent)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin-bottom:12px}.card.link{display:flex;flex-direction:column;gap:2px;text-decoration:none}.card.link:active{transform:scale(.99)}.card.disabled{opacity:.55;pointer-events:none}.hero{text-align:center;padding:24px 16px}.big-number{font-size:2.6rem;font-weight:700;line-height:1;margin:0 0 4px;font-variant-numeric:tabular-nums}.tiles{display:grid;grid-template-columns:1fr 1fr;gap:12px}.tiles .card{margin:0}.row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.grow{flex:1}.stack{display:flex;flex-direction:column;gap:8px;margin-top:8px}ul.plain{list-style:none;margin:0;padding:0}.list li .card{margin-bottom:10px}button,.button{font:inherit;color:inherit;border:1px solid var(--line);background:var(--surface);border-radius:12px;min-height:48px;padding:10px 16px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;touch-action:manipulation}button:disabled{cursor:default}.primary{background:var(--text);color:var(--bg);border-color:var(--text);font-weight:600}.primary:disabled{opacity:.35}.ghost{background:transparent}.danger{color:var(--bad)}.wide{width:100%;margin-top:12px}.icon-btn{min-height:40px;min-width:40px;padding:0;border:none;background:transparent;color:var(--muted);border-radius:50%;vertical-align:middle;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}.icon-btn:hover{color:var(--text)}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.segmented{display:flex;gap:4px;background:var(--bg);border-radius:12px;padding:4px;margin-bottom:12px}.segmented button{flex:1;border:none;background:transparent;min-height:40px}.segmented button.on{background:var(--surface);font-weight:600;box-shadow:0 1px 2px #0000001a}.tabbar{position:fixed;inset:auto 0 0 0;display:flex;justify-content:center;background:var(--surface);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);z-index:10}.tabbar a{flex:1;max-width:140px;height:var(--tabbar);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:.72rem;text-decoration:none;color:var(--muted)}.tabbar a.on{color:var(--accent)}.session{padding-bottom:32px}.session-head{display:flex;align-items:center;gap:12px;margin-bottom:24px}.progress{flex:1;height:6px;border-radius:3px;background:var(--line);overflow:hidden}.progress div,.meter div{height:100%;background:var(--accent);border-radius:inherit;transition:width .3s ease}.meter{height:6px;border-radius:3px;background:var(--line);overflow:hidden;margin-top:4px}.kicker{font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:8px}.prompt{font-size:1.3rem;line-height:1.4;margin-bottom:20px}.prompt.big{font-size:1.8rem;font-weight:600}.reveal{font-size:1.3rem;border-top:1px solid var(--line);padding-top:16px}.details{margin:8px 0 12px}.answer-line{font-weight:600;font-size:1.1rem;margin-bottom:4px}.forms{color:var(--muted);font-size:.9rem}.example{margin-top:8px}.grade-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin-top:16px}.grade.again{color:var(--bad)}.grade.good{background:var(--text);color:var(--bg);border-color:var(--text);font-weight:600}.text-input{width:100%;font:inherit;font-size:1.2rem;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--text);margin-bottom:10px}.text-input.correct{border-color:var(--good)}.text-input.close{border-color:var(--close)}.text-input.wrong{border-color:var(--bad)}.letter{min-width:48px;padding:0}.gap{display:inline-block;min-width:3em;border-bottom:2px solid var(--muted);text-align:center;padding:0 4px}.gap.filled{border-color:var(--accent);font-weight:600}.options{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}.option{justify-content:flex-start;text-align:left}.option.is-correct{border-color:var(--good);background:var(--good-soft)}.option.is-wrong{border-color:var(--bad);background:var(--bad-soft)}.tile-line,.tile-pool{display:flex;flex-wrap:wrap;gap:8px;min-height:64px;padding:8px;align-items:center;border-radius:12px}.tile-line{border:1px dashed var(--line);margin-bottom:12px}.tile-line.correct{border:1px solid var(--good);background:var(--good-soft)}.tile-line.wrong{border:1px solid var(--bad);background:var(--bad-soft)}.tile{min-height:44px;padding:6px 14px}.feedback{margin-top:16px;padding:16px;border-radius:var(--radius);background:var(--good-soft)}.feedback.close{background:var(--close-soft)}.feedback.wrong{background:var(--bad-soft)}.verdict{font-weight:700}.feedback.correct .verdict{color:var(--good)}.feedback.close .verdict{color:var(--close)}.feedback.wrong .verdict{color:var(--bad)}.why,.note{font-size:.95rem}.note{font-weight:600}.prose p{margin-bottom:.9rem}.prose p:last-child,.examples li:last-child{margin-bottom:0}.examples li{margin-bottom:12px}.reading{font-size:1.1rem;line-height:1.75}.word{all:unset;cursor:pointer;border-radius:4px}.word:hover,.word.active{background:var(--accent-soft)}.word:focus-visible{outline:2px solid var(--accent)}.sheet{position:sticky;bottom:calc(var(--tabbar) + 12px + env(safe-area-inset-bottom));background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px 16px;margin-bottom:12px;box-shadow:0 8px 24px #0000001f;z-index:5}.sheet p{margin:4px 0 8px}.question{margin-bottom:16px}.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.stat{display:flex;flex-direction:column;align-items:center;padding:16px 8px}.stat .big-number{font-size:1.8rem}.bars li{margin-bottom:12px}.bars a{display:block;text-decoration:none}.missed li{padding:6px 0;border-bottom:1px solid var(--line)}.missed li:last-child{border:none}@media(prefers-reduced-motion:reduce){*{transition:none!important}}.tile-pool:empty{display:none}