:root{--bg: #f5f6fb;--surface: #fff;--surface-2: #f0f2f8;--surface-3: #e3e7f1;--text: #121528;--text-2: #3a3f58;--muted: #6b7190;--border: #e2e5ef;--primary: #4f46e5;--primary-ink: #fff;--primary-soft: #eef0ff;--ok: #15803d;--ok-soft: #e8f7ee;--mid: #b45309;--mid-soft: #fff5e6;--bad: #c62828;--bad-soft: #fdecec;--info: #0e7490;--info-soft: #e7f9fc;--star: #f5a400;--radius: 16px;--shadow: 0 1px 2px rgb(18 21 40 / .05), 0 4px 14px rgb(18 21 40 / .06);--tabbar-h: 64px;--font: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;color-scheme:light}.theme-adult{--primary: #1d4ed8;--primary-soft: #eaf1ff}.theme-teen{--primary: #6d28d9;--primary-soft: #f1eaff;--accent: #06b6d4}.theme-kid{--bg: #fff8ee;--surface-2: #fff1dc;--surface-3: #ffe3bf;--border: #f3dab6;--text: #2b2140;--text-2: #4b3f63;--muted: #7c6f90;--primary: #f26a1b;--primary-soft: #fff0e3;--radius: 22px;--shadow: 0 3px 0 #f1d3ae, 0 6px 18px rgb(255 140 60 / .12)}@media (prefers-color-scheme: dark){:root:not([data-theme=kid]){--bg: #0d1020;--surface: #161a2e;--surface-2: #1d2238;--surface-3: #283050;--text: #ecedf7;--text-2: #c7cbe0;--muted: #959bb8;--border: #2a3150;--primary: #8b85ff;--primary-ink: #0d1020;--primary-soft: #232655;--ok: #4ade80;--ok-soft: #12291d;--mid: #fbbf24;--mid-soft: #2e2410;--bad: #f87171;--bad-soft: #331719;--info: #67e8f9;--info-soft: #0f2a33;--shadow: 0 1px 2px rgb(0 0 0 / .4);color-scheme:dark}:root[data-theme=adult]{--primary: #7aa2ff;--primary-soft: #182648}:root[data-theme=teen]{--primary: #b394ff;--primary-soft: #241a4d}}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.55 var(--font);-webkit-font-smoothing:antialiased}.theme-kid{font-size:17px}h1,h2,h3{line-height:1.25;margin:0 0 .5rem}h1{font-size:1.45rem}h2{font-size:1.1rem}h3{font-size:1rem}p{margin:0 0 .6rem}a{color:var(--primary);text-decoration:none}button{font:inherit}[hidden]{display:none!important}:focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 50%,transparent);outline-offset:2px;border-radius:10px}sup.lbl{font-size:.7em;font-weight:800;color:var(--primary);margin-right:1px}u{text-decoration-thickness:2px;text-underline-offset:3px}.shell{min-height:100vh;background:var(--bg)}.page{max-width:760px;margin:0 auto;padding:14px 14px calc(var(--tabbar-h) + 24px + env(safe-area-inset-bottom))}.appbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:10px;padding:8px 14px;padding-top:calc(8px + env(safe-area-inset-top));background:color-mix(in srgb,var(--surface) 92%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.brand{display:flex;align-items:center;gap:10px;color:var(--text);min-width:0;flex:1}.logo{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;background:var(--primary-soft);font-size:1.3rem;flex:none}.brand-text{display:flex;flex-direction:column;min-width:0}.brand-text b{font-size:.98rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.brand-text small{color:var(--muted);font-size:.76rem}.switch{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:var(--surface-2);color:var(--text);font-size:1.1rem;font-weight:700}.topnav{display:none}.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:30;display:flex;background:var(--surface);border-top:1px solid var(--border);padding:4px 4px env(safe-area-inset-bottom);height:calc(var(--tabbar-h) + env(safe-area-inset-bottom))}.tabbar a{position:relative;flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;color:var(--muted);font-size:.7rem;font-weight:600;border-radius:12px}.tabbar a.active{color:var(--primary)}.tabbar .ti{font-size:1.35rem;line-height:1.1}.tabbar .badge{position:absolute;top:4px;left:calc(50% + 6px)}.badge{min-width:18px;height:18px;padding:0 5px;border-radius:9px;display:inline-grid;place-items:center;background:var(--bad);color:#fff;font-size:.68rem;font-weight:800;margin-left:4px}@media (min-width: 900px){.tabbar{display:none}.topnav{display:flex;gap:4px}.topnav a{padding:.5rem .8rem;border-radius:10px;color:var(--text-2);font-weight:600;font-size:.92rem}.topnav a.active{background:var(--primary-soft);color:var(--primary)}.page{padding-bottom:40px;padding-top:22px}}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:12px;box-shadow:var(--shadow)}.theme-kid .card{border-width:2px}.card h2{margin-bottom:.6rem}.head{display:flex;align-items:flex-end;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:4px 0 14px}.head h1{margin:0}.eyebrow{margin:0 0 2px;color:var(--muted);font-size:.74rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em}.muted{color:var(--muted)}.small{font-size:.86rem}.center{text-align:center}.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:10px}.row.end{justify-content:flex-end}.row.between{justify-content:space-between}.row.center{justify-content:center}.grid{display:grid;gap:10px}.grid.two{grid-template-columns:1fr 1fr}@media (min-width: 640px){.grid.three{grid-template-columns:repeat(3,1fr)}.grid.four{grid-template-columns:repeat(4,1fr)}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:46px;padding:0 18px;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-weight:650;cursor:pointer;text-align:center}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--primary);border-color:var(--primary);color:var(--primary-ink)}.btn.ghost{background:transparent}.btn.danger{color:var(--bad)}.btn.block{width:100%}.btn.sm{min-height:36px;padding:0 12px;font-size:.88rem}.theme-kid .btn{border-radius:999px;border-width:2px;min-height:50px}.theme-kid .btn.primary{box-shadow:0 4px #c9530f}.icon-btn{width:42px;height:42px;flex:none;border-radius:50%;border:1px solid var(--border);background:var(--surface);color:var(--primary);display:inline-grid;place-items:center;cursor:pointer;font-size:1rem}.icon-btn.playing{background:var(--primary);color:var(--primary-ink)}.icon-btn.rec{color:var(--bad)}.icon-btn.recording{background:var(--bad);color:#fff;animation:pulse 1.2s infinite}@keyframes pulse{50%{box-shadow:0 0 0 8px #c6282800}0%,to{box-shadow:0 0 #c6282866}}.chip{display:inline-flex;align-items:center;gap:4px;padding:.25rem .65rem;border-radius:999px;background:var(--surface-2);color:var(--text-2);font-size:.8rem;font-weight:700;border:1px solid transparent}.chip.ok,.chip.good{background:var(--ok-soft);color:var(--ok)}.chip.bad,.chip.low{background:var(--bad-soft);color:var(--bad)}.chip.mid{background:var(--mid-soft);color:var(--mid)}.chip.book{background:var(--info-soft);color:var(--info)}.chip.challenge{background:#fff1d6;color:#9a5b00}button.chip{cursor:pointer;min-height:34px}button.chip.on{border-color:var(--primary);background:var(--primary-soft);color:var(--primary)}.chips{display:flex;gap:6px;flex-wrap:wrap}.scroll-x{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none;margin:0 -14px;padding-left:14px;padding-right:14px}.scroll-x::-webkit-scrollbar{display:none}.scroll-x>*{flex:none}.input,select.input,textarea.input{width:100%;min-height:48px;padding:10px 12px;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);font:inherit}textarea.input{min-height:140px;resize:vertical}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:12px;font-weight:600;font-size:.9rem;color:var(--text-2)}.check{display:flex;align-items:center;gap:10px;min-height:44px;color:var(--text-2)}.check input{width:20px;height:20px;accent-color:var(--primary)}.alert{padding:12px 14px;border-radius:14px;margin:10px 0}.alert.ok{background:var(--ok-soft)}.alert.bad{background:var(--bad-soft)}.alert.warn{background:var(--mid-soft)}.alert.info{background:var(--info-soft)}.alert strong{display:block}.alert.ok strong{color:var(--ok)}.alert.bad strong{color:var(--bad)}.progress{height:8px;background:var(--surface-3);border-radius:99px;overflow:hidden}.progress>span{display:block;height:100%;background:var(--primary);border-radius:inherit;transition:width .3s}.progress>span.good{background:var(--ok)}.progress>span.mid{background:var(--mid)}.progress>span.low{background:var(--bad)}.ring{--p: 0;--c: var(--primary);width:92px;height:92px;border-radius:50%;display:grid;place-items:center;flex:none;background:conic-gradient(var(--c) calc(var(--p) * 1%),var(--surface-3) 0)}.ring span{width:78%;height:78%;border-radius:50%;background:var(--surface);display:grid;place-items:center;font-weight:800;font-size:1.15rem}.ring.good{--c: var(--ok)}.ring.mid{--c: var(--mid)}.ring.low{--c: var(--bad)}.ring.sm{width:60px;height:60px}.ring.sm span{font-size:.95rem}.stars{color:var(--star);letter-spacing:2px}.big-stars{font-size:2.4rem;color:var(--star);letter-spacing:4px}.empty{text-align:center;padding:30px 10px;color:var(--muted)}.spinner{width:32px;height:32px;border-radius:50%;border:3px solid var(--surface-3);border-top-color:var(--primary);animation:spin 1s linear infinite;margin:30px auto}@keyframes spin{to{transform:rotate(360deg)}}.toast{position:fixed;left:50%;bottom:calc(var(--tabbar-h) + 18px);transform:translate(-50%);z-index:60;background:var(--text);color:var(--bg);padding:10px 16px;border-radius:14px;box-shadow:0 8px 24px #0003;max-width:92vw}.stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}@media (min-width: 640px){.stats{grid-template-columns:repeat(4,1fr)}}.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px;box-shadow:var(--shadow)}.stat .label{font-size:.76rem;color:var(--muted);font-weight:700}.stat b{display:block;font-size:1.6rem;line-height:1.15}.stat b em{font-style:normal;font-size:.85rem;color:var(--muted);font-weight:600}.stat small{color:var(--muted);font-size:.74rem}.bar-row{margin-bottom:10px}.bar-row .top{display:flex;justify-content:space-between;font-size:.88rem;color:var(--text-2);margin-bottom:4px}.vbars{display:flex;align-items:flex-end;gap:6px;height:90px}.vbars div{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:4px;height:100%;font-size:.7rem;color:var(--muted)}.vbars i{width:100%;max-width:30px;background:var(--primary-soft);border-radius:6px 6px 3px 3px;min-height:3px}.vbars i.on{background:var(--primary)}.list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.item{display:flex;align-items:center;gap:12px;padding:12px;border-radius:14px;border:1px solid var(--border);background:var(--surface);color:var(--text)}a.item:active{transform:scale(.99)}.item .ic{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:var(--surface-2);font-size:1.4rem;flex:none}.item .tx{flex:1;min-width:0;display:flex;flex-direction:column}.item .tx small{color:var(--muted);font-size:.8rem}.item .end{font-size:.8rem;font-weight:700;color:var(--muted);white-space:nowrap}.item.locked{opacity:.5}.item.done .end{color:var(--ok)}.section-title{font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:800;margin:18px 2px 8px}.content-list{display:flex;flex-direction:column;gap:10px}.ci{padding:12px;border-radius:14px;background:var(--surface-2)}.ci .en{font-weight:700;font-size:1.05rem;margin:0}.ci .vi{color:var(--text-2);margin:2px 0 0;font-size:.94rem}.ci .ex{font-size:.9rem;color:var(--text-2);margin:6px 0 0;padding-top:6px;border-top:1px dashed var(--border)}.ci .note{font-size:.86rem;color:var(--mid);margin:6px 0 0}.ci-row{display:flex;gap:10px;align-items:flex-start}.ci-row .grow{flex:1;min-width:0}.ci .acts{display:flex;gap:6px;flex:none}.pic{font-size:2.6rem;line-height:1}.word-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}@media (min-width: 560px){.word-grid{grid-template-columns:repeat(3,1fr)}}.word-card{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 8px;border-radius:20px;border:2px solid var(--border);background:var(--surface);text-align:center;cursor:pointer}.word-card .pic{font-size:3rem}.word-card b{font-size:1.15rem}.word-card small{color:var(--muted)}.line{display:flex;gap:8px;align-items:flex-start}.line .who{font-weight:800;font-size:.78rem;color:var(--primary)}.line .bubble{flex:1;background:var(--surface-2);border-radius:4px 14px 14px;padding:8px 12px;border:2px solid transparent}.line.you{flex-direction:row-reverse}.line.you .bubble{background:var(--primary-soft);border-radius:14px 4px 14px 14px}.line.current .bubble{border-color:var(--primary)}.blur{filter:blur(5px);cursor:pointer;-webkit-user-select:none;user-select:none}.passage{font-size:1.02rem;line-height:1.7;white-space:pre-line}.seg{display:inline-flex;background:var(--surface-2);border:1px solid var(--border);border-radius:12px;padding:3px}.seg button{border:0;background:transparent;padding:.45rem .75rem;min-height:36px;border-radius:9px;cursor:pointer;font-weight:650;color:var(--text-2)}.seg button.on{background:var(--surface);color:var(--primary);box-shadow:var(--shadow)}.grammar-box code{display:block;padding:10px 12px;border-radius:10px;background:var(--primary-soft);font:600 .92rem/1.5 ui-monospace,Consolas,monospace;white-space:pre-wrap;margin-bottom:6px;color:var(--text)}.mistake{display:grid;grid-template-columns:1fr;gap:2px;padding:8px 10px;border-radius:10px;background:var(--surface-2);margin-bottom:6px;font-size:.92rem}.mistake s{color:var(--bad)}.mistake b{color:var(--ok)}.timeline{width:100%;height:auto;display:block;margin:6px 0 10px}.qhead{display:flex;align-items:center;gap:10px;margin-bottom:12px}.qhead .progress{flex:1}.pill{font-size:.78rem;font-weight:800;padding:.2rem .6rem;border-radius:999px;background:var(--surface-2);color:var(--text-2);white-space:nowrap}.prompt{font-size:1.08rem;font-weight:650;margin-bottom:12px}.theme-kid .prompt{font-size:1.2rem}.qpic{font-size:4.2rem;text-align:center;margin:4px 0 8px}.opts{display:flex;flex-direction:column;gap:8px}.opt{display:flex;align-items:center;gap:12px;width:100%;text-align:left;min-height:54px;padding:10px 14px;border-radius:14px;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;font-weight:550}.theme-kid .opt{border-width:2px;font-size:1.1rem}.opt .key{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:var(--surface-2);color:var(--muted);font-weight:800;flex:none;font-size:.85rem}.opt.right{border-color:var(--ok);background:var(--ok-soft)}.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}.opt.chosen{border-color:var(--primary);background:var(--primary-soft)}.opt:disabled{cursor:default;color:var(--text)}.pic-opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}.pic-opts .opt{justify-content:center;min-height:104px;font-size:3rem}.listen-box{display:flex;align-items:center;gap:10px;padding:12px;border-radius:14px;background:var(--primary-soft);margin-bottom:12px;flex-wrap:wrap}.tok-line{min-height:56px;padding:8px;border-radius:14px;border:2px dashed var(--border);display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-bottom:10px}.tok-line.right{border:2px solid var(--ok);background:var(--ok-soft)}.tok-line.wrong{border:2px solid var(--bad);background:var(--bad-soft)}.tok{min-height:42px;padding:.4rem .8rem;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-weight:650;cursor:pointer;box-shadow:var(--shadow)}.tok.on{background:var(--primary-soft)}.cloze-text{line-height:2.3;font-size:1.02rem}.cloze-text select,.cloze-text input{min-height:38px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);padding:2px 6px;font:inherit;max-width:100%}.cloze-text .ok{border-color:var(--ok);background:var(--ok-soft)}.cloze-text .bad{border-color:var(--bad);background:var(--bad-soft)}.match{display:grid;grid-template-columns:1fr 1fr;gap:10px}.match .col{display:flex;flex-direction:column;gap:8px}.m-btn{min-height:60px;border-radius:16px;border:2px solid var(--border);background:var(--surface);font-weight:700;font-size:1.05rem;cursor:pointer;color:var(--text);touch-action:none}.m-btn.pic{font-size:2.2rem}.m-btn.sel{border-color:var(--primary);background:var(--primary-soft)}.m-btn.done{border-color:var(--ok);background:var(--ok-soft);opacity:.65}.shake{animation:shake .35s;border-color:var(--bad)!important}@keyframes shake{25%{transform:translate(-6px)}75%{transform:translate(6px)}}.letters{display:flex;gap:12px;justify-content:center}.letter{width:68px;height:68px;border-radius:18px;border:2px solid var(--border);background:var(--surface);font-size:1.8rem;font-weight:800;cursor:pointer;color:var(--text)}.letter.right{background:var(--ok-soft);border-color:var(--ok)}.letter.wrong{background:var(--bad-soft);border-color:var(--bad)}.gap-word{font-size:2.2rem;font-weight:800;letter-spacing:.1em;text-align:center}.gap-word i{font-style:normal;color:var(--primary);border-bottom:4px solid var(--primary);padding:0 .1em}.situation{background:var(--surface-2);border-left:4px solid var(--primary);border-radius:12px;padding:10px 14px;margin-bottom:10px}.timer{display:flex;align-items:center;gap:10px;margin:8px 0}.timer .progress{flex:1;height:10px}.timer b{min-width:2ch;text-align:right;font-size:1.3rem}.timer.urgent b{color:var(--bad)}.timer.urgent .progress>span{background:var(--bad)}.live{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:14px;background:var(--bad-soft)}.live.self{background:var(--info-soft)}.rec-dot{width:12px;height:12px;border-radius:50%;background:var(--bad);flex:none;animation:blink 1s infinite}@keyframes blink{50%{opacity:.25}}.self-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.self-grid button{display:flex;flex-direction:column;align-items:flex-start;padding:10px 12px;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;text-align:left}.self-grid small{color:var(--muted)}.feedback{margin-top:12px}.model{font-weight:650;display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:4px 0}.diff span{padding:0 2px;border-radius:4px}.diff .hit{background:var(--ok-soft);color:var(--ok)}.diff .miss{color:var(--muted);text-decoration:underline dotted}.sticky-actions{position:sticky;bottom:calc(var(--tabbar-h) + 8px + env(safe-area-inset-bottom));z-index:5;display:flex;gap:8px;padding-top:8px}@media (min-width: 900px){.sticky-actions{bottom:12px}}.flash{min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:8px}.flash .front{font-size:1.35rem;font-weight:700}.flash .back{font-size:1.6rem;font-weight:800;color:var(--primary)}.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:12px}.grades.three{grid-template-columns:repeat(3,1fr)}.grades button{display:flex;flex-direction:column;align-items:center;gap:2px;padding:10px 4px;border-radius:14px;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;font-weight:700}.grades small{color:var(--muted);font-size:.72rem;font-weight:500}.pin-dots{display:flex;gap:14px;justify-content:center;margin:14px 0}.pin-dots i{width:16px;height:16px;border-radius:50%;border:2px solid var(--primary)}.pin-dots i.on{background:var(--primary)}.keypad{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;max-width:280px;margin:0 auto}.keypad button{height:58px;border-radius:16px;border:1px solid var(--border);background:var(--surface);font-size:1.4rem;font-weight:700;color:var(--text);cursor:pointer}.profile-card{display:flex;align-items:center;gap:14px;padding:16px;border-radius:20px;border:2px solid var(--border);background:var(--surface);cursor:pointer;text-align:left;width:100%;color:var(--text);box-shadow:var(--shadow)}.profile-card .av{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;font-size:2.2rem;flex:none}.profile-card.adult_sap .av{background:#eaf1ff}.profile-card.grade4 .av{background:#fff0e3}.profile-card.grade8 .av{background:#f1eaff}.badge-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}@media (min-width: 560px){.badge-grid{grid-template-columns:repeat(5,1fr)}}.badge-tile{display:flex;flex-direction:column;align-items:center;text-align:center;gap:2px;padding:10px 4px;border-radius:14px;background:var(--surface-2);font-size:.72rem}.badge-tile .bi{font-size:1.8rem}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation:none!important;transition:none!important}}