:root{color-scheme:light;--ink:#163c35;--green:#194d43;--mint:#e4eee7;--paper:#f5f5ed;--muted:#61766e;--line:#dae2d9;--red:#9c352e}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Helvetica Neue","Noto Sans JP",sans-serif;padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:24px max(20px,calc((100vw - 850px)/2));border-bottom:1px solid var(--line);background:#fff}.brand{display:flex;align-items:center;gap:12px}.brand strong{font-size:15px}.logo{width:45px;height:45px;border-radius:13px;background:var(--green);color:white;display:grid;place-items:center;font:italic bold 30px Georgia}.eyebrow{display:block;font-size:10px;letter-spacing:.14em;color:var(--muted);font-weight:700}.badge{background:var(--mint);padding:5px 10px;border-radius:20px;font-size:11px;white-space:nowrap}main{max-width:850px;margin:auto;padding:20px}nav{display:grid;grid-template-columns:repeat(4,1fr);background:#e8ece3;border-radius:14px;padding:5px;gap:4px;position:sticky;top:0;z-index:3}button,input,select{font:inherit}button{min-height:48px;border:0;border-radius:10px;padding:12px 16px;cursor:pointer;font-weight:650;color:var(--green);background:#e7eee8;touch-action:manipulation}nav button{padding:9px 2px;background:transparent;font-size:14px;min-height:44px}nav button.active{background:#fff;box-shadow:0 2px 8px #153c3510}button:disabled{cursor:default;opacity:.45}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #b39639;outline-offset:3px}.intro{padding:30px 2px 20px}.intro h1{font-size:32px;letter-spacing:-.04em;margin:6px 0}p{margin:8px 0 16px}.intro p,.muted{color:var(--muted);font-size:13px}.panel{background:white;border:1px solid var(--line);border-radius:20px;padding:24px;margin:16px 0;box-shadow:0 3px 14px #193c3503}h2{font-size:18px;margin:0 0 14px}.section-title{display:flex;justify-content:space-between;align-items:baseline;gap:10px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}label{display:block;font-size:13px;font-weight:600;margin:12px 0}input:not([type=checkbox]):not([type=file]),select{width:100%;min-height:48px;border:1px solid var(--line);background:#fafbf8;border-radius:10px;padding:10px 12px;color:var(--ink);font-size:16px;margin-top:5px}input[type=checkbox]{width:20px;height:20px;accent-color:var(--green);flex-shrink:0}.check{display:flex;gap:8px;align-items:center;margin:20px 0}.primary{background:var(--green);color:#fff}.secondary{background:var(--mint);color:var(--green)}.quiet{background:#f1f4ed;font-size:13px}.panel>button{margin:5px 6px 5px 0}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.stat{background:#e8eee4;border:1px solid #dce5d9;border-radius:14px;padding:14px}.stat strong{display:block;font-size:26px;line-height:1.3}.stat span{font-size:11px;color:var(--muted)}.card{display:flex;flex-direction:column;justify-content:center;align-items:center;width:100%;min-height:250px;background:#f5f7f0;border:1px solid var(--line);font-weight:400;text-align:center;padding:28px 18px;margin:16px 0;overflow-wrap:anywhere}.card .prompt{font-size:30px;line-height:1.4;font-weight:600}.card .answer{font-size:23px;margin-top:20px;color:var(--green)}.card .hint{font-size:12px;color:var(--muted);margin-top:24px}.study-top{display:flex;justify-content:space-between;align-items:center;gap:8px}.choice{display:block;width:100%;text-align:left;margin:10px 0;border:1px solid var(--line);background:#fff;font-weight:500;overflow-wrap:anywhere}.choice.correct{background:#e5f2e8;border:2px solid #36815b;opacity:1}.choice.incorrect{background:#fbece6;border:2px solid #b85140;opacity:1}.feedback{background:#edf4e9;padding:15px;border-radius:10px;margin:12px 0}.feedback.wrong{background:#fff0ea;color:#82362e}progress{width:100%;height:8px;accent-color:var(--green)}.file{padding:14px;border:1px dashed #8ca396;border-radius:12px;background:#f8faf5}.file input{display:block;width:100%;margin-top:10px;font-size:13px}#notice:not(:empty),#storageError{padding:14px;border-radius:12px;margin-bottom:14px;background:#e4eee0;font-size:14px}#storageError{background:#fff0e6;color:#813222;border:1px solid #de9d83}.history-item{border-top:1px solid var(--line);padding:14px 0;overflow-wrap:anywhere}.history-item small{display:block;color:var(--muted)}.result-tag{font-size:12px;font-weight:700}.wrong-tag{color:var(--red)}.preview-table{overflow-x:auto;max-height:260px;font-size:12px}table{border-collapse:collapse;width:100%}td,th{text-align:left;border:1px solid var(--line);padding:8px;min-width:100px}.paper-page{background:white;padding:32px;margin:16px 0;border:1px solid var(--line);color:#111}.paper-page h2{color:#111}.paper-meta{border-bottom:1px solid #999;padding-bottom:15px;font-size:13px}.paper-item{padding:14px 0;border-bottom:1px solid #ccc;break-inside:avoid;overflow-wrap:anywhere}.answer-line{height:34px;border-bottom:1px solid #999;margin-top:8px}.paper-number{font-size:11px;color:#555}footer{text-align:center;font-size:9px;letter-spacing:.18em;color:var(--muted);padding:28px 12px}dialog{border:0;border-radius:18px;max-width:420px;padding:25px}dialog::backdrop{background:#18352b80}[hidden]{display:none!important}@media(max-width:500px){header{padding:18px 16px}.brand strong{font-size:12px}.brand .eyebrow{font-size:8px;letter-spacing:.04em}header .badge{font-size:9px;padding:5px 7px}main{padding:14px}.panel{padding:18px}.intro h1{font-size:28px}.stat{padding:12px}.card .prompt{font-size:26px}.paper-page{padding:20px}.grid>button{padding:12px 7px;font-size:14px}}@page{size:A4;margin:16mm}@media print{body{background:white;padding:0;color:#000;font-size:11pt}header,nav,footer,#notice,#storageError,.intro,#learn,#history,#data,#paper>.panel{display:none!important}main{max-width:none;padding:0}#paper{display:block!important}#paperPreview{display:block!important}.paper-page{padding:0;margin:0;border:0;box-shadow:none}.paper-page.answers{break-before:page}.paper-item{padding:9px 0}.paper-meta{font-size:10pt}.paper-page h2{font-size:18pt}body.no-answers .answers{display:none!important}}