:root{--c-primary: #143d55;--c-accent: #ffe246;--c-bg: #faf8ef;--c-surface: #ffffff;--c-text: #18343f;--c-muted: #3f5160;--c-border: #d6e1e5;--c-success: #146a60;--c-danger: #a13535;--c-accent-soft: #fff6c2;--c-primary-soft: #e7eff3;--font: system-ui, -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;--fs-body: 18px;--fs-caption: 15.5px;--fs-heading: 28px;--fs-fraction: 36px;--tap: 48px;--radius: 16px;--max: 1024px;--s1: 4px;--s2: 8px;--s3: 12px;--s4: 16px;--s5: 24px;--s6: 32px;--s7: 48px;--anim: .18s;color-scheme:light}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;text-size-adjust:100%}body{margin:0;background:var(--c-bg);color:var(--c-text);font-family:var(--font);font-size:var(--fs-body);line-height:1.7;overflow-wrap:anywhere}h1,h2,h3{line-height:1.35;margin:0 0 var(--s3);color:var(--c-primary)}h1{font-size:var(--fs-heading)}h2{font-size:22px}h3{font-size:19px}p{margin:0 0 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var(--s4);align-items:center}.footer a{display:inline-flex;align-items:center;min-height:var(--tap);padding:0 var(--s2)}.stack>*+*{margin-top:var(--s4)}.row{display:flex;flex-wrap:wrap;gap:var(--s3);align-items:center}.grid-2{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s4)}@container app (min-width: 768px){.grid-2{grid-template-columns:minmax(0,3fr) minmax(0,2fr);align-items:start}}.card{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius);padding:var(--s5) var(--s4)}.card-accent{border:2px solid var(--c-primary);box-shadow:6px 6px 0 var(--c-accent)}.card h2:first-child,.card h3:first-child{margin-top:0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--s2);min-height:var(--tap);min-width:var(--tap);padding:var(--s2) var(--s5);border-radius:999px;border:2px solid var(--c-primary);background:var(--c-surface);color:var(--c-primary);font:inherit;font-weight:700;text-decoration:none;cursor:pointer;transition:transform var(--anim),background-color var(--anim);text-align:center;line-height:1.35}.btn:hover{background:var(--c-primary-soft)}.btn:active{transform:translateY(1px)}.btn[disabled],.btn[aria-disabled=true]{opacity:.5;cursor:not-allowed;transform:none}.btn-primary{background:var(--c-accent);color:var(--c-primary);box-shadow:0 3px 0 var(--c-primary)}.btn-primary:hover{background:#ffeb7a}.btn-dark{background:var(--c-primary);color:#fff}.btn-dark:hover{background:#1d5373}.btn-danger{border-color:var(--c-danger);color:var(--c-danger)}.btn-quiet{border-color:transparent;background:transparent;text-decoration:underline;font-weight:600}.btn-block{width:100%}.btn-big{font-size:22px;min-height:64px}.btn-emph{outline:3px dashed var(--c-primary);outline-offset:2px}.btn-row{display:flex;flex-wrap:wrap;gap:var(--s3)}.banner{display:flex;gap:var(--s3);align-items:center;flex-wrap:wrap;border-radius:12px;padding:var(--s3) var(--s4);margin-bottom:var(--s4);border:2px solid var(--c-primary);background:var(--c-accent-soft)}.banner p{margin:0;flex:1 1 220px}.banner-warn{border-color:var(--c-danger);background:#fbeaea}.fraction{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.1;color:var(--c-primary)}.fraction-num,.fraction-den{font-size:var(--fs-fraction);padding:0 .15em;min-width:1.2em;text-align:center}.fraction-bar{width:100%;min-width:1.4em;height:4px;background:currentColor;border-radius:2px;margin:4px 0}.fraction-sm .fraction-num,.fraction-sm .fraction-den{font-size:26px}.fraction-labeled{display:inline-grid;grid-template-columns:auto 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var(--s4)}.target-label{font-weight:700;font-size:var(--fs-caption)}.choices{border:0;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--s3)}@container app (min-width: 560px){.choices{grid-template-columns:repeat(4,minmax(0,1fr))}}.choice{position:relative;display:flex;align-items:center;justify-content:center;min-height:120px;border:2px solid var(--c-border);border-radius:var(--radius);background:var(--c-surface);cursor:pointer}.choice input{position:absolute;z-index:2;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}.choice:has(input:checked){border-color:var(--c-primary);background:var(--c-accent-soft);box-shadow:inset 0 0 0 2px var(--c-primary)}.choice:has(input:focus-visible){outline:3px solid 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button[aria-checked=true]{background:var(--c-primary);color:#fff}.hand{display:flex;flex-wrap:wrap;gap:var(--s2)}.num-card{padding:0;border:0;background:none;cursor:pointer;position:relative;border-radius:10px;transition:transform var(--anim)}.num-card .card-face{animation:deal .25s ease}.num-card:after{content:"";position:absolute;left:50%;bottom:20px;width:22px;height:3px;margin-left:-11px;background:#111;border-radius:2px;opacity:.35}.num-card.is-placed:after{bottom:14px;width:16px;margin-left:-8px}.num-card:hover{transform:translateY(-3px)}.num-card[disabled]{opacity:.4;cursor:not-allowed;transform:none}@keyframes deal{0%{transform:translateY(-14px) rotate(-6deg) scale(.9);opacity:0}to{transform:none;opacity:1}}.reduce-inputs{display:inline-grid;grid-template-columns:auto 7em;gap:var(--s2) var(--s3);align-items:center}.reduce-inputs label{font-weight:700;color:var(--c-primary);text-align:right}.reduce-inputs 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var(--s3)}.dialog-backdrop{position:fixed;inset:0;background:#143d558c;display:flex;align-items:center;justify-content:center;padding:var(--s4);z-index:50}.dialog{background:var(--c-surface);border-radius:var(--radius);padding:var(--s5) var(--s4);max-width:520px;width:100%;max-height:calc(100dvh - 32px);overflow:auto;border:2px solid var(--c-primary)}.longpress{position:relative;overflow:hidden}.longpress-fill{position:absolute;left:0;bottom:0;height:6px;background:var(--c-primary);width:0}.longpress.is-pressing .longpress-fill{width:100%;transition:width 2s linear}.photo{width:100%;height:auto;border-radius:12px;display:block;background:var(--c-primary-soft)}.photo-fallback{border-radius:12px;background:var(--c-primary-soft);padding:var(--s5);text-align:center;color:var(--c-muted)}.steps-dots{display:flex;gap:var(--s2);list-style:none;padding:0;margin:0 0 var(--s3)}.steps-dots li{width:12px;height:12px;border-radius:50%;border:2px solid var(--c-primary)}.steps-dots li.current{background:var(--c-primary)}.deck-illustration{display:flex;gap:var(--s4);align-items:flex-end;flex-wrap:wrap}.deck-stack{width:64px;height:86px;border-radius:10px;border:2px solid var(--c-primary);background:repeating-linear-gradient(45deg,var(--c-primary),var(--c-primary) 6px,#1d5373 6px,#1d5373 12px);box-shadow:4px 4px 0 var(--c-border),8px 8px 0 var(--c-border)}@container app (max-width: 380px){.slot-row{grid-template-columns:1fr auto}.slot-label{grid-column:1 / -1}.num-card{font-size:28px}.btn{padding:var(--s2) var(--s4)}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;animation:none!important}.longpress.is-pressing .longpress-fill{transition:none!important;width:100%}}h1[tabindex="-1"]:focus,main[tabindex="-1"]:focus{outline:none;box-shadow:none}ruby{ruby-position:over}rt{font-size:.46em;font-weight:500;letter-spacing:-.04em;color:inherit;opacity:.85}h1 rt,h2 rt{font-size:.42em}.btn rt{font-size:.46em}.say{display:flex;align-items:flex-end;gap:var(--s2)}.say-bubble{position:relative;margin:0 0 8px;padding:10px 14px;background:var(--c-surface);border:2px solid var(--c-primary);border-radius:16px;font-weight:700;line-height:2}.say-bubble:before{content:"";position:absolute;left:-10px;bottom:12px;border:8px solid transparent;border-right-color:var(--c-primary)}.mascot-cheer,.mascot-happy{animation:hop .6s ease}@keyframes hop{0%,to{transform:translateY(0)}40%{transform:translateY(-10px)}}.confetti{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:50;opacity:.7}.confetti span{position:absolute;top:-20px;width:10px;height:16px;border-radius:2px;animation:fall 1.4s ease-in forwards}@keyframes fall{to{top:105%;opacity:.6;transform:rotate(540deg) translate(30px)}}.card-face{--band: #2f6db5;display:inline-grid;grid-template-rows:14px 1fr 14px;width:64px;height:90px;border-radius:9px;border:3px solid var(--band);background:#fff;overflow:hidden;box-shadow:0 3px #143d5559}.card-red{--band: #c8323c}.card-green{--band: #2e8b57}.card-yellow{--band: #c9a227}.card-band{background-color:var(--band);background-image:radial-gradient(circle at 50% 50%,#fff 0 3px,transparent 3.5px);background-size:12px 12px;background-position:center}.card-num{display:grid;place-items:center;font-family:Hiragino Mincho ProN,Yu Mincho,"Noto Serif JP",serif;font-weight:900;font-size:40px;line-height:1;color:#111}.card-small{width:44px;height:62px;grid-template-rows:9px 1fr 9px}.card-small .card-num{font-size:26px}.die rect{stroke:#143d55;stroke-width:4}.die-red rect{fill:#d8434c}.die-blue rect{fill:#2f6db5}.die circle{fill:#fff}.die.is-rolling{animation:roll .15s linear infinite}@keyframes roll{0%{transform:rotate(0) scale(1)}50%{transform:rotate(18deg) scale(1.08)}to{transform:rotate(-12deg) scale(1)}}.meter{height:14px;border-radius:999px;background:var(--c-primary-soft);border:2px solid var(--c-primary);overflow:hidden}.meter span{display:block;height:100%;background:linear-gradient(90deg,#ffd200,#ffb200);transition:width .8s ease}.point-pop{display:inline-block;margin-left:8px;padding:0 8px;border-radius:999px;background:#ffe246;font-weight:900;color:#143d55;animation:pop-up 1.2s ease forwards}@keyframes pop-up{0%{transform:translateY(6px) scale(.6);opacity:0}30%{transform:translateY(-4px) scale(1.2);opacity:1}to{transform:translateY(0) scale(1);opacity:1}}.verdict{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:16px;border:3px solid;font-size:1.15rem}.verdict-mark{flex:none;display:grid;place-items:center;width:52px;height:52px;border-radius:50%;font-size:32px;font-weight:900;color:#fff}.verdict-wrong{border-color:var(--c-danger);background:#fdecec;animation:shake .45s ease}.verdict-wrong .verdict-mark{background:var(--c-danger)}.verdict-correct{border-color:var(--c-success);background:#e6f6ef;animation:pop-in .4s ease}.verdict-correct .verdict-mark{background:var(--c-success)}.verdict-info{border-color:var(--c-primary);background:var(--c-primary-soft)}.verdict-info .verdict-mark{background:var(--c-primary);font-size:26px}.verdict-title{display:block;font-weight:900;font-size:1.3rem;line-height:1.9}.verdict-body{display:block;line-height:2}.answer-wrong{animation:shake .45s ease}.answer-wrong .choice:has(input:checked),.answer-wrong .slot-row,.answer-wrong .reduce-inputs input{border-color:var(--c-danger)!important;background:#fdecec}.choice .wrong-x{position:absolute;top:4px;right:8px;color:var(--c-danger);font-size:28px;font-weight:900}@keyframes shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-8px)}40%,80%{transform:translate(8px)}}@keyframes pop-in{0%{transform:scale(.85)}70%{transform:scale(1.04)}to{transform:scale(1)}}.progress-dots{display:inline-flex;gap:6px}.progress-dots span{width:14px;height:14px;border-radius:50%;border:2px solid var(--c-primary)}.progress-dots .is-done{background:var(--c-primary)}.progress-dots .is-now{background:var(--c-accent)}.rank-card{display:grid;gap:8px}.rank-head{display:flex;align-items:center;gap:12px}.rank-icon{font-size:40px}.rank-name{font-size:1.4rem;font-weight:900}.badge-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(136px,1fr));gap:10px;list-style:none;padding:0;margin:0}.badge{display:grid;justify-items:center;gap:4px;padding:10px 6px;border:2px solid var(--c-border);border-radius:14px;text-align:center;font-size:.85rem;background:var(--c-surface)}.badge-icon{font-size:30px}.badge.is-locked{border-style:dashed;background:var(--c-bg, #f7f5f0)}.badge.is-locked .badge-icon{opacity:.5;filter:grayscale(1)}.badge.is-new{border-color:#e0a800;box-shadow:0 0 0 3px #ffe246;animation:pop-in .6s ease}.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;text-align:center;font-size:.85rem;line-height:1.5}.stat-row 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