:root{color-scheme:light;--ink:#203932;--muted:#65766f;--green:#176858;--pale:#e7f1eb;--line:#dce4dc;--paper:#fffefb;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;background:#f5f5ed;color:var(--ink)}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.55;cursor:wait}[hidden]{display:none!important}.shell{max-width:650px;margin:auto;padding:28px 18px calc(24px + env(safe-area-inset-bottom))}.header{display:flex;align-items:center;gap:12px}.logo{width:43px;height:43px;display:grid;place-items:center;border-radius:14px;background:var(--green);color:white;font-size:25px;font-weight:700}.eyebrow{font-size:10px;font-weight:750;letter-spacing:.15em;color:var(--muted);margin:0 0 5px}h1{font-size:22px;letter-spacing:-.04em;margin:0}h2{font-size:20px;margin:0;letter-spacing:-.03em}.tag{margin-left:auto;font-size:11px;border:1px solid var(--line);padding:7px 10px;border-radius:20px;white-space:nowrap}.intro{color:var(--muted);font-size:13px;margin:19px 0 24px}.tabs{display:flex;padding:5px;background:#e8eae1;border-radius:15px;gap:5px;margin-bottom:30px}.tab{border:0;background:transparent;color:var(--muted);flex:1;border-radius:11px;min-height:46px;font-size:14px;font-weight:650}.tab.active{background:var(--paper);color:var(--green);box-shadow:0 2px 6px #2039320a}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}.count{font-size:13px;background:var(--pale);color:var(--green);padding:4px 9px;border-radius:20px;vertical-align:middle}.quiet{min-height:44px;padding:8px 12px;background:transparent;border:1px solid var(--line);border-radius:11px;color:var(--green)}.subtext{font-size:12px;color:var(--muted);line-height:1.8;margin:12px 0 20px}.history-list{display:grid;gap:12px}.record{background:var(--paper);padding:19px;border:1px solid var(--line);border-radius:18px;overflow-wrap:anywhere}.record-head{display:flex;gap:10px;justify-content:space-between;align-items:center}.record-title{margin:0;font-size:17px}.result{font-size:12px;padding:6px 10px;border-radius:8px;white-space:nowrap}.correct{background:var(--pale);color:var(--green)}.incorrect{background:#fcf0df;color:#8e5a12}.meta{font-size:12px;color:var(--muted);line-height:1.8;margin:10px 0}.record-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid #edf0e8;padding-top:10px;gap:12px}.record-bottom span{font-size:12px;color:var(--muted)}.repeat{font-size:12px;min-height:44px;border:0;background:transparent;color:var(--green);font-weight:650;padding:8px 0 8px 10px}.empty{background:var(--paper);border:1px dashed var(--line);border-radius:18px;padding:36px 22px;font-size:14px;color:var(--muted);line-height:1.8;text-align:center}.notice{padding:14px 16px;background:var(--pale);border-radius:12px;font-size:13px;line-height:1.8;margin:0 0 18px}.notice.error{background:#fff0e5;color:#8b4529}.form-card{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:20px}fieldset{border:0;margin:0 0 25px;padding:0;min-width:0}legend{font-size:14px;font-weight:700;padding:0;margin:0 0 14px}small{font-size:11px;font-weight:400;color:var(--muted);margin-left:7px}label:not(.choice){display:block;font-size:12px;color:var(--muted);margin:14px 0 7px}input:not([type=checkbox]):not([type=radio]),select{width:100%;min-height:48px;border:1px solid #ccd8ce;border-radius:10px;background:white;padding:11px 12px;color:var(--ink);font-size:16px}.field-row{display:flex;gap:12px}.field-row>div{min-width:0;flex:1}.field-row .version{flex:0 0 70px}.hint{font-size:11px;color:var(--muted);line-height:1.7;margin:9px 0 0}.answers{display:grid;grid-template-columns:repeat(6,1fr);gap:7px}.segments{display:flex;gap:8px}.choice{position:relative;flex:1;cursor:pointer}.choice input{position:absolute;opacity:0;width:1px;height:1px}.choice span{display:flex;align-items:center;justify-content:center;min-height:48px;background:white;border:1px solid #ccd8ce;border-radius:10px;font-size:14px}.choice input:checked+span{color:var(--green);background:var(--pale);border:2px solid var(--green);font-weight:700}.choice input:focus-visible+span,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #c3a153;outline-offset:3px}.primary{border:0;background:var(--green);color:white;border-radius:12px;min-height:52px;font-size:15px;font-weight:650}.secondary{border:1px solid var(--line);background:var(--paper);color:var(--green);border-radius:12px;min-height:48px;margin-top:18px}.wide{width:100%}.centered{text-align:center}.form-message{font-size:13px;line-height:1.7;color:#8b4529}.form-message:empty{display:none}footer{text-align:center;font-size:11px;color:var(--muted);padding:30px 0 5px}@media(max-width:360px){.shell{padding-inline:12px}.tag{display:none}.form-card{padding:16px}.answers{grid-template-columns:repeat(3,1fr)}.confidence{gap:5px}.confidence .choice span{font-size:12px}}

/* 問題文はスマホで読みやすい行間とタップ領域を確保する。 */
.quiz-picker-label{margin-top:0!important}.quiz-card{margin-top:16px}.quiz-meta{display:flex;align-items:center;justify-content:space-between}.quiz-meta .tag{margin-left:0}.quiz-stem{font-size:17px;font-weight:600;line-height:1.95;margin:12px 0 24px;overflow-wrap:anywhere}.quiz-options{display:grid;gap:10px}.quiz-options .quiz-option{display:block;margin:0}.quiz-options .quiz-option-content{justify-content:flex-start;align-items:flex-start;gap:12px;padding:14px;min-height:58px;line-height:1.8}.quiz-options .option-letter{flex-shrink:0;font-size:14px}.quiz-options .option-text{display:block;min-height:0;border:0;padding:0;background:transparent;font-size:14px;line-height:1.8}.quiz-options input:checked+.quiz-option-content{padding:13px}.quiz-options input:disabled+.quiz-option-content{cursor:default}.review-card{border:1px solid var(--line);border-radius:18px;background:var(--paper);margin-top:18px;padding:22px;scroll-margin-top:16px;overflow-wrap:anywhere}.review-heading{display:flex;justify-content:space-between;align-items:center;gap:10px}.review-heading h3{font-size:21px;margin:0}.review-correct{color:var(--green)}.review-incorrect{color:#8e5a12}.saved-label{font-size:11px;color:var(--muted);white-space:nowrap}.explanation{font-size:14px;line-height:1.95;background:var(--pale);padding:15px;border-radius:12px}.review-card h4{font-size:14px;margin:24px 0 12px}.option-reason{display:flex;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13px;line-height:1.8}.option-reason strong{min-width:56px;color:var(--green)}.option-reason p{margin:0}.references{padding-left:20px;font-size:13px;line-height:1.9}.references a{color:var(--green);text-underline-offset:3px}.review-card .primary{margin-top:20px}.tab{font-size:13px}@media(max-width:360px){.quiz-stem{font-size:16px}.quiz-options .quiz-option-content{gap:9px;padding:12px}.quiz-options input:checked+.quiz-option-content{padding:11px}.review-card{padding:16px}.review-heading h3{font-size:19px}.tab{font-size:12px}}