:root{--bg:#fffaf0;--surface:#fff;--surface2:#fff1d2;--ink:#231b12;--muted:#76695a;--line:#eee2cb;--honey:#f2b33d;--honey-ink:#8a5a00;--on-honey:#231b12;--fur:#a97c47;--mint:#239a80;--mint-soft:#ddf3ec;--danger:#c9472f;--danger-soft:#fbe3dc;--shadow:0 1px 0 #3c280a0f,0 6px 20px -10px #3c280a40;--f-display:"Bricolage Grotesque","Avenir Next","Segoe UI",system-ui,sans-serif;--f-body:"Nunito Sans","Segoe UI",system-ui,-apple-system,sans-serif;--r:18px}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#16120d;--surface:#211b14;--surface2:#2e2416;--ink:#f7eedd;--muted:#b4a58f;--line:#3a2f22;--honey:#f5bc4f;--honey-ink:#f5bc4f;--on-honey:#1b140b;--fur:#a97c47;--mint:#4cc7ac;--mint-soft:#163a31;--danger:#ef7c63;--danger-soft:#43211a;--shadow:0 1px 0 #0000004d,0 8px 24px -12px #000000b3;--lightningcss-light: 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14px;font-size:14px;font-weight:700}.chip.on{background:var(--honey);border-color:var(--honey);color:var(--on-honey)}.pill{background:var(--surface2);color:var(--honey-ink);border-radius:999px;align-items:center;gap:5px;padding:3px 9px;font-size:12px;font-weight:800;display:inline-flex}.pill.ok{background:var(--mint-soft);color:var(--mint)}.pill.bad{background:var(--danger-soft);color:var(--danger)}.bar{background:var(--surface2);border-radius:99px;height:10px;overflow:hidden}.bar>i{background:var(--honey);border-radius:99px;height:100%;transition:width .6s;display:block}.say{align-items:flex-end;gap:12px;display:flex}.bubble{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:18px 18px 18px 6px;min-width:0;padding:13px 15px;position:relative}.bear{flex:none;display:block}.mascot{display:inline-block;position:relative}.mascot .ele{filter:drop-shadow(0 2px 3px #3c280a26);width:100%;height:100%;display:block;overflow:visible}.mascot 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solid var(--honey);background:var(--surface2);color:var(--ink)}.badge .medal{background:var(--line);width:34px;height:34px;font-family:var(--f-display);color:var(--muted);border-radius:50%;place-items:center;font-weight:800;display:grid}.badge.on .medal{background:var(--honey);color:var(--on-honey)}.def{background:var(--surface2);border-radius:12px;padding:10px 12px}.def b{color:var(--honey-ink)}.formula{background:var(--surface2);border-radius:10px;padding:10px 12px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13.5px;overflow-x:auto}.trap{background:var(--danger-soft);color:var(--ink);border-radius:12px;padding:10px 12px}.opt{text-align:left;border:1.5px solid var(--line);background:var(--surface);border-radius:12px;width:100%;padding:11px 13px}.opt.right{border-color:var(--mint);background:var(--mint-soft)}.opt.wrong{border-color:var(--danger);background:var(--danger-soft)}details.ex 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.prog-n{background:var(--mint);color:#fff}.steps{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.step{align-items:stretch;gap:10px;display:flex;position:relative}.step:not(:last-child):before{content:"";background:var(--line);width:2px;position:absolute;top:30px;bottom:-12px;left:13px}.step-n{background:var(--ink);width:28px;height:28px;color:var(--bg);z-index:1;border-radius:50%;flex:none;place-items:center;font-size:13px;font-weight:800;display:grid}.step-box{border:2px solid color-mix(in srgb,var(--ink) 22%,transparent);background:var(--surface);border-radius:12px;flex-direction:column;flex:1;gap:2px;min-width:0;padding:8px 12px;display:flex}.step-box p{font-variant-numeric:tabular-nums}.result-box{border:3px solid var(--honey);box-shadow:0 3px 0 color-mix(in srgb,var(--honey) 45%,transparent);background:var(--surface2);border-radius:14px;flex-direction:column;gap:2px;padding:10px 14px;display:flex}.result-box p{font-family:var(--f-display);font-size:18px;font-weight:800}.step-n.ok{background:var(--mint);color:#fff}.step-n.cur{background:var(--honey);color:var(--on-honey)}.step-box.cur{border-color:var(--honey);background:var(--surface2)}@keyframes pop2{0%{opacity:.3;transform:translateY(4px)}}.fig{background:var(--surface2);border-radius:16px;flex-direction:column;gap:8px;margin:0;padding:12px;display:flex}.fig-head{flex-direction:column;gap:2px;display:flex}.fig-svg{background:var(--surface);border-radius:12px;width:100%;max-width:100%;height:auto;display:block}.fg-l{stroke:var(--ink);stroke-width:2px;fill:none;stroke-linecap:round}.fg-d{stroke-dasharray:5 4;stroke-width:1.5px;stroke:var(--muted)}.fg-a{stroke:var(--honey-ink);stroke-width:2.6px;fill:none;stroke-linecap:round}.fg-ax{stroke:var(--muted);stroke-width:1.4px}.fg-ah{fill:var(--muted)}.fg-f{fill:color-mix(in srgb,var(--honey) 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.inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.3,.7,.3,1);position:relative}.flip.on .inner{transform:rotateY(180deg)}.face{backface-visibility:hidden;text-align:center;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);cursor:pointer;border-radius:24px;flex-direction:column;justify-content:center;align-items:center;gap:10px;padding:24px;display:flex;position:absolute;inset:0;overflow-y:auto}.face.back{background:var(--surface2);border-color:var(--honey);transform:rotateY(180deg)}.face .big{font-family:var(--f-display);text-wrap:balance;font-size:26px;font-weight:800;line-height:1.2}.face .txt{font-size:17px;line-height:1.5}.face .hint{color:var(--muted);font-size:12px;position:absolute;bottom:12px;left:0;right:0}.swipe-tag{opacity:0;z-index:2;border-radius:10px;padding:4px 10px;font-size:13px;font-weight:800;position:absolute;top:16px}.swipe-tag.yes{background:var(--mint);color:#fff;right:16px}.swipe-tag.no{background:var(--danger);color:#fff;left:16px}.boxes{gap:4px;display:flex}.boxes i{background:var(--line);border-radius:3px;flex:1;height:6px}.boxes i.on{background:var(--mint)}.exam-bar{top:env(safe-area-inset-top,0px);z-index:5;background:var(--ink);color:var(--bg);border-radius:16px;align-items:center;gap:10px;padding:10px 14px;display:flex;position:sticky}.exam-bar b{font-family:var(--f-display);font-variant-numeric:tabular-nums;font-size:22px}.exam-bar.low b{color:var(--danger)}.tf{grid-template-columns:1fr 1fr;gap:8px;display:grid}.matchrow{align-items:center;gap:8px;display:flex}.matchrow b{flex:1;min-width:0}.grade{font-family:var(--f-display);font-variant-numeric:tabular-nums;font-size:64px;font-weight:800;line-height:1}.nav{padding:8px 10px calc(8px + env(safe-area-inset-bottom,0px));background:color-mix(in srgb,var(--surface) 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svg{width:100%;height:100%;transform:rotate(-90deg)}.ring .t{flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.ring .t b{font-family:var(--f-display);font-variant-numeric:tabular-nums;letter-spacing:-.02em;font-size:56px;font-weight:800}.toast{left:50%;bottom:calc(92px + env(safe-area-inset-bottom,0px));background:var(--ink);color:var(--bg);z-index:60;box-shadow:var(--shadow);text-align:center;border-radius:14px;max-width:calc(100% - 32px);padding:11px 16px;font-size:14px;font-weight:800;animation:.25s ease-out pop;position:fixed;transform:translate(-50%)}@keyframes pop{0%{opacity:.4;transform:translate(-50%,10px)}}@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}