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solid var(--line);padding-top:12px}.user-chip{display:flex;align-items:center;gap:10px;padding:8px;border-radius:12px;text-decoration:none;color:inherit}.user-chip:hover{background:var(--surface-2);text-decoration:none}.user-chip b{display:block;font-size:.9rem;line-height:1.2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-chip small{color:var(--muted);font-size:.75rem}.main{overflow-x:clip;min-width:0;padding:28px clamp(16px,3vw,40px) 60px;max-width:1280px;width:100%;margin:0 auto}.topbar,.scrim{display:none}@media (max-width: 980px){.app{grid-template-columns:1fr}.sidebar{position:fixed;inset:0 auto 0 0;width:min(290px,86vw);transform:translate(-102%);transition:transform .3s cubic-bezier(.2,.8,.2,1);box-shadow:var(--shadow-lg)}.sidebar.open{transform:none}.scrim.show{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#08081480;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:30;animation:fade 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.muted{color:#ffffffbf}.next-card .chip{background:#ffffff2e;color:#fff}.countdown{display:flex;align-items:baseline;gap:6px}.countdown b{font:700 2.1rem var(--display)}.bars{list-style:none;margin:0;padding:0;display:grid;gap:14px}.bars li{display:grid;gap:6px;animation:rise .5s both;animation-delay:calc(var(--i) * 50ms)}.bars-top{display:flex;justify-content:space-between;font-weight:600;font-size:.9rem;gap:12px}.ring{position:relative;display:inline-grid;place-items:center;flex:none}.ring svg{position:absolute;top:0;right:0;bottom:0;left:0}.ring-in{display:grid;text-align:center;line-height:1.1}.ring-in strong{font:700 1.4rem var(--display)}.ring-in span{font-size:.72rem;color:var(--muted);font-weight:600}.chart{width:100%;height:auto;overflow:visible}.chart .tick{font:600 11px var(--font);fill:var(--muted)}.chart .tick.accent{fill:var(--accent)}.chart-line{stroke-dasharray:1;stroke-dashoffset:0;animation:draw 1.3s cubic-bezier(.2,.8,.2,1) both}.chart-area{animation:fade 1.4s 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14px;font-size:.86rem;color:var(--muted)}.fc-tr i{font:800 .64rem var(--font);font-style:normal;background:var(--surface-2);padding:1px 5px;border-radius:5px;margin-right:4px;color:var(--ink)}.fc{display:grid;gap:12px;max-width:820px;width:100%;margin:0 auto}.fc-title{text-align:center;font-weight:700;color:var(--muted)}.fc-progress{position:relative;height:8px;border-radius:99px;background:var(--track);margin-right:90px}.fc-progress span{display:block;height:100%;border-radius:99px;background:var(--primary);transition:width .3s}.fc-progress small{position:absolute;right:-90px;top:-6px;width:84px;text-align:right;font-weight:700;color:var(--muted)}.fc-card-wrap{background:var(--surface);border:1px solid var(--line);border-radius:20px;overflow:hidden}.fc-counts{display:flex;gap:14px;padding:12px 16px;border-bottom:1px solid var(--line);font:800 .82rem var(--font)}.fc-counts.big{border:0;padding:0;font-size:.9rem}.fc-counts .n{color:var(--primary)}.fc-counts .l{color:var(--coral-ink)}.fc-counts .r{color:var(--mint-ink)}.fc-card{min-height:clamp(300px,48vh,460px);display:grid;cursor:pointer;outline:none}.fc-card.back{cursor:default}.fc-front{display:grid;place-items:center;align-content:center;gap:24px;padding:24px;animation:rise .25s both}.fc-word{display:inline-flex;align-items:center;gap:10px;font:700 clamp(2rem,1.4rem + 3vw,3.3rem) var(--display);color:var(--ink);text-align:center;word-break:break-word}.fc-word.sm{font-size:clamp(1.5rem,1.2rem + 1.4vw,2rem)}.fc-say{border:0;background:var(--surface-2);color:var(--ink);width:40px;height:40px;border-radius:50%;display:inline-grid;place-items:center;cursor:pointer;flex:none}.fc-say.sm{width:30px;height:30px}.fc-say:hover{background:var(--primary-soft);color:var(--primary)}.fc-tap{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border-radius:99px;background:var(--surface-2);color:var(--muted);font:700 .8rem var(--font)}.fc-backside{display:grid;grid-template-columns:auto 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var(--font);background:var(--surface-2);color:var(--muted);border-radius:5px;padding:1px 5px}.fc-btn.again{border-color:#e4574a;color:#c0392b}.fc-btn.hard{border-color:#f2a900;color:#8a6100}.fc-btn.good{border-color:#1e8e4e;color:#1e8e4e}.fc-btn.easy{border-color:var(--signal);color:var(--signal)}:root[data-theme=dark] .fc-btn.again{color:#ff7a6b}:root[data-theme=dark] .fc-btn.hard{color:#ffcb3d}:root[data-theme=dark] .fc-btn.good{color:#4fd18a}:root[data-theme=dark] .fc-btn.easy{color:#9db3ff;border-color:#5c7bea}.fc-btn:not(:disabled):hover{transform:translateY(-2px)}.fc-btn:disabled{cursor:default}.fc-hint{text-align:center;font-size:.82rem;color:var(--muted)}.fc-empty,.vt-result{display:grid;justify-items:center;gap:10px;text-align:center;padding:30px 16px}@keyframes flipin{0%{opacity:0;transform:rotateX(-12deg) translateY(8px)}to{opacity:1;transform:none}}@media (max-width: 640px){.fc-backside{grid-template-columns:1fr}.fc-img{width:100%;max-width:260px;justify-self:center}.fc-rate{position:sticky;bottom:calc(76px + env(safe-area-inset-bottom));background:var(--bg);padding:6px 0}.fc-btn kbd{display:none}}.vt{display:grid;gap:14px;max-width:720px;width:100%;margin:0 auto}.vt-card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:clamp(18px,3vw,26px);display:grid;gap:12px}.vt-prompt{font:var(--reading)}.vt-prompt.big{font:700 clamp(1.6rem,1.2rem + 2vw,2.2rem) var(--display)}.vt-opts{display:grid;gap:8px}.vt-opt{display:flex;align-items:center;gap:10px;text-align:left;padding:13px 14px;border-radius:14px;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);font:600 .95rem/1.4 var(--font);cursor:pointer;min-height:52px}.vt-opt .L{width:28px;height:28px;border-radius:8px;background:var(--surface-2);display:grid;place-items:center;font-weight:800;flex:none}.vt-opt 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cubic-bezier(.2,.8,.2,1)}.btn:hover:not(:disabled)>svg:last-child:not(:first-child){transform:translate(3px)}.btn.ghost:hover:not(:disabled),.btn.soft:hover:not(:disabled),.btn.outline:hover:not(:disabled){transform:translateY(-1px)}.btn.primary:hover:not(:disabled){box-shadow:0 14px 26px -12px color-mix(in srgb,var(--primary) 85%,transparent)}.btn.sun:hover:not(:disabled){box-shadow:0 14px 26px -12px #d6a000e6}.btn.primary:after,.btn.sun:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(110deg,transparent 30%,rgba(255,255,255,.28) 50%,transparent 70%);transform:translate(-120%);pointer-events:none}.btn.primary:hover:not(:disabled):after,.btn.sun:hover:not(:disabled):after{transform:translate(120%);transition:transform .7s ease}.btn:active:not(:disabled){transform:scale(.97);transition-duration:.06s}.icon-btn,.icon-sm{transition:transform .15s,background .15s,color .15s}.icon-btn:hover,.icon-sm:hover{transform:translateY(-1px)}.nav a,.side-nav a{transition:background .15s,color .15s}.nav a svg,.side-nav a svg{transition:transform .2s cubic-bezier(.2,.8,.2,1)}.nav a:hover svg,.side-nav a:hover svg{transform:scale(1.12) rotate(-4deg)}a.card,.card.clickable,.v-unit,.qb-row{transition:transform .18s,box-shadow .2s,background .15s,border-color .15s}a.card:hover,.card.clickable:hover{transform:translateY(-2px);box-shadow:0 18px 34px -24px #161b3d73}.qb-row:hover .qb-radio{border-color:var(--primary)}.tabbar a,.tabbar button{transition:color .15s,transform .15s}.tabbar a:active,.tabbar button:active{transform:scale(.92)}@media (prefers-reduced-motion: reduce){.rv{opacity:1;transform:none}.btn:after{display:none}}.char{display:inline-block;object-fit:contain;flex:none;-webkit-user-select:none;user-select:none;filter:drop-shadow(0 6px 10px rgba(22,27,61,.18));transition:transform .25s cubic-bezier(.2,.8,.2,1)}.char-sad{filter:grayscale(.55) drop-shadow(0 4px 6px rgba(22,27,61,.15));transform:rotate(-6deg) translateY(4px)}.char-win{animation:char-win 1.6s ease-in-out infinite}@keyframes char-win{0%,to{transform:translateY(0) rotate(0)}30%{transform:translateY(-10px) rotate(-4deg)}60%{transform:translateY(0) rotate(3deg)}}.arena-pick button:hover .char,.arena-mode:hover .char{transform:translateY(-4px) scale(1.06)}@media (prefers-reduced-motion: reduce){.char-win{animation:none}}.v-unit-add{justify-content:center;gap:8px;border-style:dashed;color:var(--primary);font:700 .9rem var(--font);cursor:pointer;min-height:64px}.v-unit-add:hover{background:var(--primary-soft)}.v-add-deck{border-style:dashed;height:54px}.btn.danger-text{color:var(--bad)}.bb{--bb-ink: #1E1E1E;--bb-bg: #FFFFFF;--bb-soft: #F3F4F7;--bb-line: #C9CDD6;--bb-blue: #324DC7;--bb-blue-soft: #E8ECFB;--bb-foot: #FFFFFF;position:fixed;top:0;right:0;bottom:0;left:0;z-index:90;display:grid;grid-template-rows:auto auto minmax(0,1fr) auto;background:var(--bb-bg);color:var(--bb-ink)}:root[data-theme=dark] .bb{--bb-ink: #EEF1F8;--bb-bg: #0F1330;--bb-soft: #1A2048;--bb-line: #39417A;--bb-blue: #7C9BFF;--bb-blue-soft: #1E2A66;--bb-foot: #0F1330}.bb-head{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;padding:10px clamp(12px,2.4vw,32px);min-height:64px}.bb-title b{display:block;font:700 1.02rem/1.25 var(--font)}.bb-dir{margin-top:2px;display:inline-flex;align-items:center;gap:4px;border:0;background:none;padding:0;color:var(--bb-ink);font:600 .88rem var(--font);cursor:pointer}.bb-dir:hover{text-decoration:underline}.bb-timer{display:grid;justify-items:center;gap:4px}.bb-clock{font:700 1.3rem/1 var(--font);font-variant-numeric:tabular-nums;letter-spacing:.02em}.bb-clock.low{color:#c0392b}:root[data-theme=dark] .bb-clock.low{color:#ff7a6b}.bb-hide{border:1px solid var(--bb-ink);background:transparent;color:var(--bb-ink);border-radius:99px;padding:2px 12px;font:600 .78rem var(--font);cursor:pointer}.bb-hide:hover{background:var(--bb-soft)}.bb-tools{display:flex;justify-content:flex-end;gap:4px}.bb-tool{display:grid;justify-items:center;gap:2px;min-width:58px;padding:6px 8px;border:0;border-radius:10px;background:transparent;color:var(--bb-ink);font:600 .72rem var(--font);cursor:pointer}.bb-tool:hover{background:var(--bb-soft)}.bb-tool.on{background:#fff1b8;color:#1e1e1e}.bb-rule{height:3px;background:repeating-linear-gradient(90deg,var(--bb-ink) 0 14px,transparent 14px 20px);opacity:.85}.bb-main{min-height:0;overflow:hidden;display:grid}.bb-split{display:grid;grid-template-columns:var(--bb-left, 50%) 14px minmax(0,1fr);min-height:0}.bb-single{display:grid;justify-items:center;min-height:0;overflow:auto}.bb-single .bb-pane{width:min(760px,100%)}.bb-pane{overflow:auto;padding:28px clamp(16px,3vw,44px) 40px;min-height:0}.bb-divider{position:relative;cursor:col-resize;background:var(--bb-soft);border-left:1px solid var(--bb-line);border-right:1px solid var(--bb-line);touch-action:none}.bb-divider span{position:absolute;top:50%;left:50%;width:22px;height:40px;transform:translate(-50%,-50%);border-radius:8px;background:var(--bb-ink)}.bb-divider span:before{content:"";position:absolute;top:12px;right:7px;bottom:12px;left:7px;border-left:2px solid var(--bb-bg);border-right:2px solid var(--bb-bg)}.bb-passage{font:400 1.06rem/1.75 Georgia,"Noto Serif",Times New Roman,serif;color:var(--bb-ink);max-width:68ch;white-space:pre-line}.bb-passage.hl-on{cursor:text}.bb-passage.hl-on ::selection{background:#ffe46b;color:#1e1e1e}.bb-hl{background:#ffe46b;color:#1e1e1e;border-radius:2px;cursor:pointer}.bb-passage .blank{display:inline-block;width:64px;border-bottom:2px solid currentColor;vertical-align:baseline}.bb-passage table{font-family:var(--font);font-size:.92rem;border-collapse:collapse;margin:12px 0}.bb-passage td,.bb-passage th{border:1px solid var(--bb-line);padding:6px 10px}.bb-qbar{display:flex;align-items:center;gap:12px;padding:0 8px 0 0;background:var(--bb-soft);border-bottom:2px dashed var(--bb-line);margin-bottom:18px;min-height:40px}.bb-qn{display:grid;place-items:center;min-width:36px;height:40px;padding:0 8px;background:var(--bb-ink);color:var(--bb-bg);font:700 1.05rem var(--font)}.bb-mark{display:inline-flex;align-items:center;gap:6px;border:0;background:none;color:var(--bb-ink);font:600 .9rem var(--font);cursor:pointer;padding:6px 4px}.bb-mark.on svg{color:#c0392b}:root[data-theme=dark] .bb-mark.on svg{color:#ff7a6b}.bb-abc{border:1.5px solid var(--bb-ink);background:var(--bb-bg);border-radius:6px;padding:2px 8px;cursor:pointer;color:var(--bb-ink)}.bb-abc span{font:700 .8rem var(--font);text-decoration:line-through}.bb-abc.on{background:var(--bb-blue);border-color:var(--bb-blue);color:#fff}.bb-prompt{font:400 1.06rem/1.6 Georgia,"Noto Serif",serif;margin:0 0 18px}.bb-meta{display:flex;gap:8px;flex-wrap:wrap;margin:-8px 0 14px;font-size:.8rem;color:var(--muted);font-weight:600}.bb-opts{display:grid;gap:12px}.bb-opt{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:10px}.bb-opt-main{position:relative;display:flex;align-items:center;gap:14px;width:100%;min-height:52px;padding:10px 14px;border:1.5px solid var(--bb-ink);border-radius:10px;background:var(--bb-bg);color:var(--bb-ink);text-align:left;font:400 1rem/1.45 var(--font);cursor:pointer;transition:box-shadow .12s,border-color .12s}.bb-opt-main:hover:not(:disabled){box-shadow:0 0 0 1px var(--bb-ink)}.bb-L{flex:none;display:grid;place-items:center;width:28px;height:28px;border-radius:50%;border:1.5px solid var(--bb-ink);font:700 .88rem var(--font)}.bb-t{flex:1}.bb-opt.sel .bb-opt-main{border-color:var(--bb-blue);box-shadow:0 0 0 2px var(--bb-blue)}.bb-opt.sel .bb-L{background:var(--bb-blue);border-color:var(--bb-blue);color:#fff}.bb-opt.out .bb-opt-main{opacity:.55}.bb-opt.out .bb-t,.bb-opt.out .bb-L{text-decoration:line-through}.bb-opt.out .bb-opt-main:after{content:"";position:absolute;left:8px;right:8px;top:50%;border-top:2px solid var(--bb-ink)}.bb-x{position:relative;display:grid;place-items:center;width:30px;height:30px;border-radius:50%;border:1.5px solid var(--bb-ink);background:var(--bb-bg);color:var(--bb-ink);font:700 .8rem var(--font);cursor:pointer}.bb-x:after{content:"";position:absolute;left:-3px;right:-3px;top:50%;border-top:2px solid var(--bb-ink)}.bb-undo{border:0;background:none;font:700 .85rem var(--font);color:var(--bb-ink);text-decoration:underline;cursor:pointer;padding:6px}.bb-opt.right .bb-opt-main{border-color:#1e8e4e;box-shadow:0 0 0 2px #1e8e4e;background:color-mix(in srgb,#1E8E4E 8%,var(--bb-bg))}.bb-opt.right .bb-L{background:#1e8e4e;border-color:#1e8e4e;color:#fff}.bb-opt.wrong .bb-opt-main{border-color:#c0392b;box-shadow:0 0 0 2px #c0392b;background:color-mix(in srgb,#C0392B 7%,var(--bb-bg))}.bb-opt.wrong .bb-L{background:#c0392b;border-color:#c0392b;color:#fff}.bb-opt.dim .bb-opt-main{opacity:.6}.bb-ok{color:#1e8e4e;flex:none}.bb-no{color:#c0392b;flex:none}.bb-opt-main:disabled{cursor:default}.bb-feedback{margin-top:20px;padding:16px 18px;border-radius:12px;border:1.5px solid var(--bb-line);background:var(--bb-soft);display:grid;gap:8px;font-size:.96rem;line-height:1.55;animation:rise .3s both}.bb-feedback h3{font:700 1rem var(--font);margin:0}.bb-feedback.ok h3{color:#1e8e4e}.bb-feedback.no h3{color:#c0392b}:root[data-theme=dark] .bb-feedback.ok h3{color:#4fd18a}:root[data-theme=dark] .bb-feedback.no h3{color:#ff7a6b}.bb-feedback p{margin:0}.bb-feedback .tip{padding:10px 12px;border-radius:10px;background:var(--sun-50);color:var(--ink)}.bb-foot{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;padding:10px clamp(12px,2.4vw,32px);background:var(--bb-foot);border-top:3px dashed var(--bb-line)}.bb-who{font:700 .95rem var(--font);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bb-navbtn{display:inline-flex;align-items:center;gap:8px;padding:9px 16px;border:0;border-radius:10px;background:var(--bb-ink);color:var(--bb-bg);font:700 .92rem var(--font);cursor:pointer}.bb-navbtn svg{transform:rotate(180deg)}.bb-btns{display:flex;justify-content:flex-end;gap:10px}.bb-btn{min-width:92px;height:42px;padding:0 22px;border-radius:99px;border:0;background:var(--bb-blue);color:#fff;font:700 .95rem var(--font);cursor:pointer;transition:filter .15s,transform .15s}.bb-btn:hover:not(:disabled){filter:brightness(1.08);transform:translateY(-1px)}.bb-btn:disabled{opacity:.45;cursor:not-allowed}:root[data-theme=dark] .bb-btn{background:#2a55e5}.bb-btn.ghost{background:transparent;color:var(--bb-blue);box-shadow:inset 0 0 0 1.5px var(--bb-blue)}.bb-btn.sun{background:#ffcb3d;color:#161b3d}.bb-legend{display:flex;flex-wrap:wrap;gap:16px;padding-bottom:12px;margin-bottom:14px;border-bottom:1px solid var(--line);font-size:.84rem;font-weight:600}.bb-legend span{display:inline-flex;align-items:center;gap:6px}.bb-legend i{width:16px;height:16px;border:1.5px dashed var(--ink);border-radius:3px}.bb-legend i.ans{background:var(--primary);border:0}.bb-legend i.cur{border:0;width:10px;height:10px;border-radius:50%;background:var(--ink)}.bb-legend .flag,.bb-cell .flag{color:#c0392b}.bb-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(42px,1fr));gap:12px 10px}.bb-grid.big{grid-template-columns:repeat(auto-fill,minmax(48px,1fr))}.bb-cell{position:relative;height:42px;border:1.5px dashed var(--ink);border-radius:4px;background:var(--surface);color:var(--primary);font:700 1rem var(--font);cursor:pointer}.bb-cell.ans{background:var(--primary);border:1.5px solid var(--primary);color:#fff}.bb-cell.right{background:#1e8e4e;border:1.5px solid #1E8E4E;color:#fff}.bb-cell.wrong{background:#c0392b;border:1.5px solid 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span{color:#c9cfe6;font-weight:600;margin-top:-24px}.mr-groups{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px}.mr-group{display:grid;grid-template-columns:1fr auto;gap:6px 10px;padding:14px;border:1px solid var(--line);border-radius:16px;background:var(--surface);font-weight:600;font-size:.9rem}.mr-group b{font-variant-numeric:tabular-nums}.mr-group i{grid-column:1 / -1;height:6px;border-radius:6px;background:var(--track);overflow:hidden}.mr-group em{display:block;height:100%;border-radius:6px}.mr-group em.hi{background:#1e8e4e}.mr-group em.mid{background:#ffcb3d}.mr-group em.lo{background:#c0392b}@media (max-width: 640px){.mr-hero{grid-template-columns:1fr}.mr-acc{width:120px;height:120px}}@media (max-width: 980px){.sidebar .nav{flex:none;overflow:visible;min-height:auto}}.arena-groups{display:flex;gap:4px;padding:4px;border-radius:12px;background:#f0f3f7;overflow-x:auto;scrollbar-width:none}.arena-groups 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