:root{--bg: #f4efe4;--bg2: #ece5d4;--card: #fffdf8;--card2: #f8f4ea;--text: #221d18;--muted: #8a7d6d;--accent: #a4322c;--accent-soft: #f3ddd8;--accent-deep: #832420;--good: #2f8f5b;--good-bg: #e7f4ec;--bad: #c2453f;--bad-bg: #fbe9e8;--line: #e2d8c6;--tone1: #c0392b;--tone2: #2f8f5b;--tone3: #2d5b9e;--tone4: #7b4a8f;--tone5: #8a7d6d;--r: 16px;--r-sm: 10px;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px)}@media (prefers-color-scheme: dark){:root{--bg: #191512;--bg2: #211c17;--card: #262019;--card2: #2d2620;--text: #f2ece1;--muted: #a5988a;--accent: #d05248;--accent-soft: #3d2523;--accent-deep: #b03c33;--line: #3a322a;--good: #4aae78;--good-bg: #1f3129;--bad: #d3625c;--bad-bg: #3a2422;--tone1: #e05a4c;--tone2: #4aae78;--tone3: #5f8fd6;--tone4: #a878bd;--tone5: #a5988a}}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Inter,Roboto,Helvetica,Arial,sans-serif;overscroll-behavior:none;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer;color:inherit}input,textarea{font-family:inherit}.app{display:flex;flex-direction:column;height:100%;max-width:560px;margin:0 auto}.main{flex:1;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:12px 16px 8px;display:flex;flex-direction:column}.scrolly{overflow-y:auto}.pad-b{padding-bottom:24px}@keyframes popIn{0%{transform:translateY(14px) scale(.985);opacity:0}to{transform:none;opacity:1}}.pop-in{animation:popIn .28s cubic-bezier(.22,.9,.3,1)}@keyframes pulse{0%{transform:scale(1)}40%{transform:scale(1.04)}to{transform:scale(1)}}.hdr{padding:calc(10px + var(--safe-top)) 16px 8px}.modeswitch{display:flex;gap:6px;background:var(--bg2);border-radius:99px;padding:4px}.modeswitch button{flex:1;border:none;background:none;color:var(--muted);font-weight:700;font-size:13.5px;padding:9px 6px;border-radius:99px;transition:all .18s}.modeswitch button.on{background:var(--card);color:var(--accent);box-shadow:0 1px 4px #0000001a}.hdr-stats{display:flex;align-items:center;gap:12px;margin-top:10px}.streak{font-weight:800;font-size:15px;white-space:nowrap}.streak small{color:var(--muted);font-weight:600}.goal-wrap{flex:1;display:flex;align-items:center;gap:8px}.goal-p{flex:1}.goal-label{font-size:12px;font-weight:800;color:var(--muted);white-space:nowrap}.goal-label small{font-weight:600}.pbar{height:7px;background:var(--bg2);border-radius:99px;overflow:hidden}.pbar>div{height:100%;background:var(--accent);border-radius:99px;transition:width .35s ease}.session-p{margin-bottom:12px}.ai-banner{margin:0 16px 4px;background:var(--accent-soft);color:var(--accent-deep);border-radius:var(--r-sm);padding:8px 12px;font-size:12.5px;font-weight:600;display:flex;align-items:center;justify-content:space-between;gap:8px}.ai-banner button{background:none;border:1px solid currentColor;border-radius:99px;padding:3px 10px;font-size:11.5px;font-weight:700;color:inherit}.nav{display:flex;border-top:1px solid var(--line);background:var(--card);padding:6px 4px calc(8px + var(--safe-bottom))}.nav button{flex:1;background:none;border:none;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:2px;font-size:10.5px;font-weight:700;padding:6px 0 2px;border-radius:var(--r-sm);transition:color .15s}.nav button.on{color:var(--accent)}.nav-ic{font-size:20px;filter:grayscale(1) opacity(.75)}.nav button.on .nav-ic{filter:none}.pinyin-c .t1{color:var(--tone1)}.pinyin-c .t2{color:var(--tone2)}.pinyin-c .t3{color:var(--tone3)}.pinyin-c .t4{color:var(--tone4)}.pinyin-c .t5{color:var(--tone5)}.tone-legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:11.5px;font-weight:700;margin:4px 2px 10px}.tone-legend .t1{color:var(--tone1)}.tone-legend .t2{color:var(--tone2)}.tone-legend .t3{color:var(--tone3)}.tone-legend .t4{color:var(--tone4)}.card-area{display:flex;flex-direction:column;flex:1;min-height:0}.dir-tag{align-self:center;font-size:11.5px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);background:var(--bg2);border-radius:99px;padding:5px 14px;margin-bottom:14px}.dir-tag.new{color:var(--accent);background:var(--accent-soft)}.big-pic{font-size:84px;text-align:center;margin:14px 0 10px;line-height:1.15}.big-pic.small{font-size:56px;margin:6px 0}.prompt-en{text-align:center;font-size:21px;font-weight:750;margin:4px 0 16px}.prompt-en .lit{font-size:14px;color:var(--muted);font-weight:500}.hanzi-big{font-size:72px;font-weight:600;line-height:1.15;letter-spacing:2px}.hanzi-mid{font-size:40px;font-weight:600;line-height:1.2}.center{text-align:center}.center-block{display:block;text-align:center}.pinyin-mid{font-size:21px;font-weight:600;display:block;text-align:center;margin-top:6px}.tap-audio{font-size:13px;color:var(--muted);font-weight:500}.top-gap{margin-top:16px}.reveal-hanzi{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px 16px 14px;display:flex;flex-direction:column;align-items:center;gap:4px;box-shadow:0 2px 12px #0000000d}.reveal-word{background:none;border:none;font-size:40px;font-weight:800;letter-spacing:-.5px;text-align:center;padding:8px 0 2px}.reveal-word.left{text-align:left;padding-left:0}.stack{display:flex;flex-direction:column;gap:10px;margin-top:auto;padding-top:12px}.opt-btn{background:var(--card);border:1.5px solid var(--line);border-radius:var(--r-sm);padding:15px 14px;font-size:16.5px;font-weight:600;text-align:center;transition:transform .07s,background .15s,border-color .15s}.opt-btn:active{transform:scale(.985)}.opt-btn.correct{background:var(--good-bg);border-color:var(--good);color:var(--good);animation:pulse .3s}.opt-btn.wrong{background:var(--bad-bg);border-color:var(--bad);color:var(--bad)}.opt-btn.dim{opacity:.45}.tone-opt{display:flex;justify-content:center;gap:10px;align-items:baseline}.tone-en{font-size:13px;color:var(--muted);font-weight:500}.btn-primary{background:var(--accent);color:#fff;border:none;border-radius:var(--r-sm);padding:15px;font-size:16px;font-weight:750;transition:transform .07s}.btn-primary:active{transform:scale(.985)}.btn-primary:disabled{opacity:.45}.btn-ghost{background:var(--card);border:1.5px solid var(--line);border-radius:var(--r-sm);padding:13px;font-size:15px;font-weight:650}.btn-ghost.danger{color:var(--bad);border-color:var(--bad)}.full{width:100%}.grade-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.grade{border:1.5px solid var(--line);background:var(--card);border-radius:var(--r-sm);padding:14px 4px;font-weight:750;font-size:14px;transition:transform .07s}.grade:active{transform:scale(.96)}.grade.again{color:var(--bad)}.grade.hard{color:#b9822a}.grade.good{color:var(--good)}.grade.easy{color:var(--tone3)}.audio-big{align-self:center;font-size:34px;background:var(--card);border:1.5px solid var(--line);border-radius:50%;width:84px;height:84px;margin:12px 0 6px;box-shadow:0 2px 10px #0000000f;transition:transform .1s}.audio-big:active{transform:scale(.94)}.pic-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}.pic-opt{background:var(--card);border:1.5px solid var(--line);border-radius:var(--r);padding:18px 8px;display:flex;flex-direction:column;align-items:center;gap:6px;transition:transform .07s,border-color .15s,background .15s}.pic-opt:active{transform:scale(.97)}.pic-opt-emoji{font-size:44px;line-height:1.1}.pic-opt-label{font-size:12.5px;color:var(--muted);font-weight:600}.pic-opt.correct{border-color:var(--good);background:var(--good-bg);animation:pulse .3s}.pic-opt.wrong{border-color:var(--bad);background:var(--bad-bg)}.pic-opt.dim{opacity:.45}.answer-line{text-align:center;font-size:16px;padding:10px;background:var(--card2);border-radius:var(--r-sm)}.mic-result{text-align:center;font-size:14px;font-weight:650;padding:10px;border-radius:var(--r-sm);background:var(--card2)}.mic-result.ok{color:var(--good);background:var(--good-bg)}.mic-result.no{color:var(--bad);background:var(--bad-bg)}.example{background:var(--card2);border:1px dashed var(--line);border-radius:var(--r-sm);padding:12px;text-align:left;margin-top:10px}.ex-h{font-size:17px;font-weight:650}.ex-p{font-size:13.5px;display:block;margin-top:2px}.ex-e{font-size:13.5px;color:var(--muted);margin-top:3px}.ex-line{font-size:14.5px;line-height:1.5;margin:4px 0}.today-start{margin:auto 0;display:flex;flex-direction:column;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:26px 20px;box-shadow:0 4px 20px #0000000f}.ts-icon{width:62px;height:62px;border-radius:18px;background:var(--accent);color:#fff;font-size:30px;font-weight:800;display:grid;place-items:center;align-self:center}.today-start h2{text-align:center;margin:0;font-size:22px;letter-spacing:-.3px}.ts-rows{display:flex;flex-direction:column;gap:2px}.sum-row{display:flex;justify-content:space-between;padding:8px 2px;border-bottom:1px dashed var(--line);font-size:14.5px}.sum-row:last-child{border-bottom:none}.center-wrap{margin:auto 0}.summary{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:26px 20px;display:flex;flex-direction:column;gap:10px;box-shadow:0 4px 20px #0000000f}.summary h2{text-align:center;margin:0 0 6px}.summary-check{width:56px;height:56px;border-radius:50%;background:var(--good);color:#fff;font-size:28px;font-weight:800;display:grid;place-items:center;align-self:center;animation:pulse .5s}.shadow-step{text-align:center;font-size:16px;font-weight:700;padding:12px;border-radius:var(--r-sm);background:var(--card2);margin-top:12px}.shadow-step.repeat{background:var(--accent-soft);color:var(--accent-deep)}.chat{display:flex;flex-direction:column;flex:1;min-height:0}.chat-scroll{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:8px;padding:4px 0 10px}.bubble{max-width:85%;padding:10px 14px;border-radius:16px;font-size:15px;line-height:1.5;white-space:pre-wrap}.bubble.user{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:4px}.bubble.assistant{align-self:flex-start;background:var(--card);border:1px solid var(--line);border-bottom-left-radius:4px}.chat-input{display:flex;gap:8px;padding-top:8px}.chat-input input{flex:1;background:var(--card);border:1.5px solid var(--line);border-radius:var(--r-sm);padding:12px;font-size:15px;color:var(--text)}.chat-input input:focus{outline:none;border-color:var(--accent)}.cat-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.cat-tile{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 12px;display:flex;flex-direction:column;align-items:flex-start;gap:4px;transition:transform .07s}.cat-tile:active{transform:scale(.97)}.cat-icon{font-size:26px}.cat-name{font-weight:750;font-size:14.5px;text-align:left}.cat-n{font-size:12px;color:var(--muted)}.link-back{background:none;border:none;color:var(--accent);font-size:15px;font-weight:650;padding:6px 0}.lib-title{margin:4px 0 10px}.lib-row{width:100%;display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-sm);padding:11px 12px;margin-bottom:8px;text-align:left}.lib-pic{font-size:24px}.lib-main{flex:1;min-width:0;display:flex;flex-direction:column}.lib-h{font-size:18px;font-weight:650}.lib-h.en{font-size:16.5px;font-weight:750}.lib-p{font-size:12.5px}.lib-en{font-size:12.5px;color:var(--muted);max-width:45%;text-align:right}.def-box{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:var(--r-sm);padding:16px;margin-bottom:8px}.def-text{font-size:18px;font-weight:650;line-height:1.45}.def-meta{font-size:12.5px;color:var(--muted);font-weight:650;margin-top:6px;text-transform:uppercase;letter-spacing:.04em}.type-box{width:100%;background:var(--card);border:1.5px solid var(--line);border-radius:var(--r-sm);padding:14px;font-size:16px;color:var(--text)}.type-box:focus{outline:none;border-color:var(--accent)}.type-box.search{margin-bottom:10px}.word-section{margin:10px 0}.word-section h4{margin:0 0 4px;font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.col-chips{display:flex;flex-wrap:wrap;gap:6px}.chip-sm{background:var(--card2);border:1px solid var(--line);border-radius:99px;padding:5px 12px;font-size:13px;font-weight:600}.why-box{background:var(--card2);border:1px solid var(--line);border-radius:var(--r-sm);padding:12px 14px;font-size:14px;line-height:1.5}.pre-wrap{white-space:pre-wrap}.rec-timer{font-size:52px;font-weight:800;text-align:center;font-variant-numeric:tabular-nums}.rec-dot{text-align:center;color:var(--bad);font-weight:700;font-size:14px;animation:pulse 1.2s infinite}.audio-el{width:100%}.transcript{font-size:13.5px;color:var(--muted);background:var(--card2);border-radius:var(--r-sm);padding:10px 12px;line-height:1.5}.ai-grade{display:flex;flex-direction:column;gap:6px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-sm);padding:14px}.ai-scores{display:flex;gap:18px;font-size:15px}.subtabs{display:flex;gap:6px;margin-bottom:12px}.subtabs button{flex:1;background:var(--bg2);border:none;border-radius:99px;padding:9px 6px;font-size:13px;font-weight:700;color:var(--muted)}.subtabs button.on{background:var(--accent);color:#fff}.practice{display:flex;flex-direction:column;flex:1;min-height:0}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:8px}.chip{background:var(--card);border:1px solid var(--line);border-radius:var(--r-sm);padding:14px;display:flex;flex-direction:column;gap:2px}.chip .big{font-size:21px;font-weight:800}.chip span:not(.big){font-size:12px;color:var(--muted)}.sec-h{margin:18px 0 8px;font-size:12px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted)}.heatmap{display:flex;gap:3px;overflow-x:auto;padding-bottom:4px}.hm-col{display:flex;flex-direction:column;gap:3px}.hm-cell{width:13px;height:13px;border-radius:3px;background:var(--bg2)}.hm-cell.l1{background:#e6c8b9}.hm-cell.l2{background:#d99a83}.hm-cell.l3{background:#c2604d}.hm-cell.l4{background:var(--accent)}@media (prefers-color-scheme: dark){.hm-cell.l1{background:#4a2f28}.hm-cell.l2{background:#6e3a30}.hm-cell.l3{background:#9c4438}.hm-cell.l4{background:var(--accent)}}.cat-row{display:flex;align-items:center;gap:10px;margin-bottom:9px}.cat-row-name{flex:0 0 46%;font-size:13.5px;font-weight:650}.cat-p{flex:1}.cat-row-n{font-size:12px;color:var(--muted);min-width:44px;text-align:right}.set-row{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-sm);padding:12px 14px;margin-bottom:8px;font-size:14.5px;font-weight:600}.set-row input[type=number]{width:70px;background:var(--bg2);border:1px solid var(--line);border-radius:8px;padding:8px;font-size:15px;text-align:center;color:var(--text)}.set-row input[type=checkbox]{width:22px;height:22px;accent-color:var(--accent)}.row-2{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:8px}.file-label{display:grid;place-items:center}.foot{text-align:center;color:var(--muted);font-size:12px;margin-top:20px}.empty-note{margin:auto;text-align:center;color:var(--muted);font-size:15px;line-height:1.6;padding:30px 20px}