:root{--bg:#f2f2f7;--card:#fff;--fill:#7676801f;--fill-strong:#76768033;--text:#000;--text-2:#3c3c439e;--text-3:#3c3c4352;--sep:#3c3c432e;--accent:#c2410c;--accent-soft:#c2410c1a;--on-accent:#fff;--green:#248a3d;--red:#d70015;--orange:#c93400;--purple:#8944ab;--blue:#06c;--radius:18px;--jp:"Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", system-ui, sans-serif;--textbook:"Klee", "Klee One", "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;-webkit-text-size-adjust:100%;font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,Segoe UI,Roboto,Hiragino Sans,Noto Sans JP,sans-serif}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}:root:not([data-theme=light]){--bg:#000;--card:#1c1c1e;--fill:#7676803d;--fill-strong:#7676805c;--text:#fff;--text-2:#ebebf599;--text-3:#ebebf54d;--sep:#54545899;--accent:#ff8a4c;--accent-soft:#ff8a4c24;--on-accent:#1a0a00;--green:#30d158;--red:#ff453a;--orange:#ff9f0a;--purple:#bf5af2;--blue:#409cff}}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#000;--card:#1c1c1e;--fill:#7676803d;--fill-strong:#7676805c;--text:#fff;--text-2:#ebebf599;--text-3:#ebebf54d;--sep:#54545899;--accent:#ff8a4c;--accent-soft:#ff8a4c24;--on-accent:#1a0a00;--green:#30d158;--red:#ff453a;--orange:#ff9f0a;--purple:#bf5af2;--blue:#409cff}:root[data-theme=light]{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--text);margin:0}body{min-height:100dvh;font-size:17px;line-height:1.4}button,input,select,textarea{font:inherit;color:inherit}a{color:var(--accent);text-decoration:none}h1{letter-spacing:.01em;margin:0 0 12px;font-size:30px;font-weight:700}h2{margin:0;font-size:20px;font-weight:600}h3{margin:0;font-size:17px;font-weight:600}p{margin:0}.jp{font-family:var(--jp)}.app{min-height:100dvh;display:flex}.sidebar{display:none}.main{min-width:0;padding-bottom:calc(76px + env(safe-area-inset-bottom));flex:1}.page{max-width:760px;padding:calc(16px + env(safe-area-inset-top)) 16px 24px;flex-direction:column;gap:16px;margin:0 auto;display:flex}.page.narrow{max-width:700px}.tabbar{z-index:20;padding:6px 4px calc(6px + env(safe-area-inset-bottom));background:color-mix(in srgb, var(--bg) 82%, transparent);-webkit-backdrop-filter:saturate(180%)blur(20px);border-top:.5px solid var(--sep);justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0}.tab{color:var(--text-2);flex-direction:column;align-items:center;gap:2px;min-width:56px;padding:4px 8px;font-size:11px;display:flex}.tab .ic{font-size:22px;line-height:26px}.tab.active{color:var(--accent)}@media (width>=900px){.sidebar{border-right:.5px solid var(--sep);background:var(--card);flex-direction:column;flex-shrink:0;gap:2px;width:230px;height:100dvh;padding:20px 12px;display:flex;position:sticky;top:0}.sidebar .brand{padding:4px 12px 16px;font-size:22px;font-weight:700}.sidebar a{color:var(--text);border-radius:10px;align-items:center;gap:10px;padding:9px 12px;display:flex}.sidebar a.active{background:var(--accent-soft);color:var(--accent);font-weight:600}.sidebar .ic{text-align:center;width:24px}.tabbar{display:none}.main{padding-bottom:0}}.topbar{align-items:center;gap:8px;min-height:44px;display:flex}.topbar .title{text-align:center;text-overflow:ellipsis;white-space:nowrap;flex:1;font-weight:600;overflow:hidden}.topbar .side{min-width:72px;display:flex}.topbar .side.right{justify-content:flex-end}.back{color:var(--accent);cursor:pointer;background:0 0;border:0;padding:8px 0;font-size:17px}.card{background:var(--card);border-radius:var(--radius);flex-direction:column;gap:12px;padding:20px;display:flex}.card.tight{padding:14px 16px}.section-title{text-transform:uppercase;letter-spacing:.04em;color:var(--text-2);margin:8px 16px -8px;font-size:13px}.list{background:var(--card);border-radius:12px;overflow:hidden}.row{border-bottom:.5px solid var(--sep);min-height:48px;color:var(--text);text-align:left;background:0 0;border-top:0;border-left:0;border-right:0;align-items:center;gap:12px;width:100%;padding:12px 16px;display:flex}.row:last-child{border-bottom:0}button.row,a.row{cursor:pointer}button.row:active,a.row:active{background:var(--fill)}.row .grow{flex:1;min-width:0}.row .chev{color:var(--text-3);font-size:18px}.footnote{color:var(--text-2);padding:6px 16px 0;font-size:13px}.muted{color:var(--text-2)}.small{font-size:13px}.caption{font-size:12px}.err{color:var(--red);font-size:14px}.ok{color:var(--green)}.warn{color:var(--orange)}.hstack{align-items:center;gap:12px;display:flex}.vstack{flex-direction:column;gap:12px;display:flex}.wrap{flex-wrap:wrap}.spacer{flex:1}.center{text-align:center;justify-content:center;align-items:center}.grid-tiles{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;display:grid}.tile{background:var(--fill);min-height:48px;color:var(--text);cursor:pointer;text-align:left;border:0;border-radius:12px;align-items:center;gap:10px;padding:0 12px;font-size:15px;font-weight:500;display:flex}.tile .ic{text-align:center;width:24px;font-weight:600}.stats3{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.stat{background:var(--card);text-align:center;border-radius:16px;padding:14px 6px}.stat .v{font-variant-numeric:tabular-nums;font-size:24px;font-weight:700}.stat .l{color:var(--text-2);font-size:12px}.btn{cursor:pointer;background:var(--fill);min-height:44px;color:var(--accent);border:0;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:0 18px;font-size:17px;font-weight:600;display:inline-flex}.btn.primary{background:var(--accent);color:var(--on-accent)}.btn.large{border-radius:14px;min-height:52px}.btn.block{width:100%}.btn.danger{color:var(--red)}.btn.plain{background:0 0;padding:0 8px}.btn.small{border-radius:10px;min-height:34px;padding:0 12px;font-size:15px}.btn:disabled{opacity:.4;cursor:default}.icon-btn{background:var(--fill);width:44px;height:44px;color:var(--accent);cursor:pointer;border:0;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:18px;display:inline-flex}.chip{background:var(--fill);cursor:pointer;color:var(--text);border:0;border-radius:999px;align-items:center;padding:6px 12px;font-size:15px;display:inline-flex}.chip.on{background:var(--accent);color:var(--on-accent)}.grade-row{grid-template-columns:repeat(4,1fr);gap:8px;display:grid}.grade{cursor:pointer;background:var(--fill);border:0;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;min-height:58px;font-weight:600;display:flex}.grade .sub{opacity:.8;font-size:12px;font-weight:400}.grade.again{color:var(--red)}.grade.hard{color:var(--orange)}.grade.good{color:var(--green)}.grade.easy{color:var(--blue)}.choice{background:var(--fill);cursor:pointer;text-align:center;width:100%;min-height:52px;color:var(--text);border:2px solid #0000;border-radius:12px;padding:10px 16px;font-size:20px}.choice.right{border-color:var(--green);background:color-mix(in srgb, var(--green) 14%, transparent)}.choice.wrong{border-color:var(--red);background:color-mix(in srgb, var(--red) 12%, transparent)}.input,.answer{background:var(--fill);border:0;border-radius:12px;outline:none;width:100%;min-height:48px;padding:10px 14px;font-size:17px}.answer{text-align:center;font-size:22px;font-family:var(--jp);min-height:56px}.input:focus,.answer:focus{box-shadow:0 0 0 2px var(--accent)}.answer.right{box-shadow:0 0 0 2px var(--green)}.answer.wrong{box-shadow:0 0 0 2px var(--red)}select.input{appearance:auto}.field{flex-direction:column;gap:6px;display:flex}.field label{color:var(--text-2);font-size:13px}.segmented{background:var(--fill);border-radius:10px;gap:2px;padding:2px;display:flex}.segmented button{cursor:pointer;color:var(--text);background:0 0;border:0;border-radius:8px;flex:1;padding:7px 8px;font-size:14px;font-weight:500}.segmented button.on{background:var(--card);box-shadow:0 1px 3px #00000026}.switch{flex-shrink:0;width:51px;height:31px;position:relative}.switch input{opacity:0;width:0;height:0;position:absolute}.switch span{background:var(--fill-strong);cursor:pointer;border-radius:31px;transition:background .2s;position:absolute;inset:0}.switch span:after{content:"";background:#fff;border-radius:50%;width:27px;height:27px;transition:transform .2s;position:absolute;top:2px;left:2px;box-shadow:0 2px 4px #0003}.switch input:checked+span{background:var(--green)}.switch input:checked+span:after{transform:translate(20px)}.stepper{background:var(--fill);border-radius:10px;align-items:center;gap:0;display:inline-flex}.stepper button{cursor:pointer;width:40px;height:34px;color:var(--accent);background:0 0;border:0;font-size:20px}.stepper span{text-align:center;font-variant-numeric:tabular-nums;min-width:36px}.furi{font-family:var(--jp);word-break:normal;overflow-wrap:anywhere;line-height:2.1;display:inline}.furi ruby{ruby-position:over}.furi rt{color:var(--text-2);letter-spacing:0;font-size:.45em}.furi rt.hidden{visibility:hidden}.furi ruby.tap{cursor:pointer;border-radius:4px}.furi ruby.tap.covered{background:var(--accent-soft)}.textbook{font-family:var(--textbook)}.big-jp{font-size:44px;font-family:var(--jp);text-align:center;line-height:1.3}.pitch{font-family:var(--jp);align-items:stretch;display:inline-flex}.pitch .m{padding:6px 2px;position:relative}.pitch .m.hi{border-top:1.5px solid var(--accent)}.pitch .m.lo{border-bottom:1.5px solid var(--accent)}.pitch .m.step{border-right:1.5px solid var(--accent)}.badge{background:var(--fill);color:var(--text-2);border-radius:999px;align-items:center;gap:4px;padding:2px 8px;font-size:12px;display:inline-flex}.badge.warn{background:color-mix(in srgb, var(--orange) 15%, transparent);color:var(--orange)}.result{font-size:17px;font-weight:600}.result.right{color:var(--green)}.result.wrong{color:var(--red)}.progressbar{background:var(--fill);border-radius:3px;width:160px;height:6px;overflow:hidden}.progressbar>div{background:var(--accent);height:100%;transition:width .3s}.sheet-backdrop{z-index:50;background:#0006;justify-content:center;align-items:flex-end;display:flex;position:fixed;inset:0}.sheet{background:var(--bg);width:100%;max-width:640px;max-height:92dvh;padding:12px 16px calc(24px + env(safe-area-inset-bottom));border-radius:16px 16px 0 0;overflow:auto}@media (width>=700px){.sheet-backdrop{align-items:center}.sheet{border-radius:16px}}.bubble{white-space:pre-wrap;border-radius:18px;max-width:85%;padding:10px 14px}.bubble.me{background:var(--accent);color:var(--on-accent);align-self:flex-end}.bubble.ai{background:var(--card);align-self:flex-start}.login{justify-content:center;align-items:center;min-height:100dvh;padding:16px;display:flex}.login .card{width:100%;max-width:380px}canvas.draw{touch-action:none;aspect-ratio:1;background:var(--card);border-radius:16px;width:100%;display:block}.bars{align-items:flex-end;gap:2px;height:140px;display:flex}.bars div{background:var(--accent);border-radius:2px 2px 0 0;flex:1;min-height:1px}
