*{box-sizing:border-box} :root{color-scheme:light;--bg:#f7ede3;--ink:#211f1b;--muted:#70675e;--line:#d9cbbd;--accent:#745341;--paper:#fffaf5}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;line-height:1.8}button,select,input{font:inherit;color:inherit}button,select,summary{cursor:pointer}button{min-height:48px;border:1px solid var(--line);border-radius:12px;background:var(--paper);padding:12px 16px;font-weight:600}button:hover{border-color:var(--accent)}button:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #8d5838;outline-offset:3px}button:disabled{opacity:.45;cursor:default}button.primary{background:var(--ink);color:#fffaf5;border-color:var(--ink)}.shell{max-width:740px;margin:auto;padding:0 22px env(safe-area-inset-bottom)}header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:30px 0 23px}.brand{display:flex;gap:12px;align-items:center}.brand-icon{font-family:Georgia,serif;font-size:34px;border:1px solid var(--ink);width:54px;height:54px;border-radius:15px;display:flex;align-items:center;justify-content:center;position:relative}.brand-icon span{font-size:16px;margin-top:-18px}h1{font-size:24px;line-height:1.2;letter-spacing:-1px;margin:4px 0}.eyebrow{font-size:10px;letter-spacing:2px;margin:0;color:var(--muted);font-weight:650}.edition{font-size:9px;letter-spacing:1.2px;line-height:1.7;color:var(--muted);text-align:right}.intro{padding:30px 0 22px}h2{font-size:clamp(27px,6vw,36px);letter-spacing:.02em;line-height:1.65;margin:10px 0 24px;font-weight:600}.subject{display:flex;align-items:center;gap:16px;font-size:13px}.subject label{color:var(--muted)}select{min-height:48px;background:transparent;border:1px solid var(--line);border-radius:10px;padding:8px 12px;max-width:100%}.sample{font-size:11px;color:var(--muted);margin:14px 0 0}nav{display:grid;grid-template-columns:repeat(5,1fr);gap:4px;border-bottom:1px solid var(--line);padding-bottom:12px;position:sticky;top:0;z-index:2;background:var(--bg);padding-top:8px}nav button{padding:10px 3px;border:0;background:transparent;border-radius:10px;font-size:14px}nav button[aria-current="page"]{background:var(--ink);color:var(--paper)}#content{padding-top:25px;min-height:350px}.section-label{display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:12px;color:var(--muted);margin-bottom:14px}.panel{border:1px solid var(--line);border-radius:18px;background:var(--paper);padding:24px;margin:14px 0}.panel h3{font-size:21px;line-height:1.7;margin:8px 0 16px}.panel p{font-size:15px;white-space:pre-line}.tag{font-size:11px;letter-spacing:.08em;color:var(--accent)}.question{white-space:pre-line}.choices{display:grid;gap:10px;margin:22px 0}.choice{text-align:left;font-weight:400;display:flex;gap:12px;align-items:center;width:100%;line-height:1.65}.choice b{font-size:12px;min-width:26px;height:26px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center}.choice[aria-pressed="true"]{border:2px solid var(--accent);background:#eee0d2}.choice:disabled{opacity:1}.wide{width:100%}.pager{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:18px 0}.pager button{flex:1}.pager span{font-size:12px;white-space:nowrap}.feedback{border-top:1px solid var(--line);margin-top:22px;padding-top:16px}.feedback strong{font-size:19px}.correct{color:#365940}.incorrect{color:#9a442e}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:18px 0}.stat{border:1px solid var(--line);border-radius:14px;padding:18px 5px;text-align:center}.stat b{display:block;font-family:Georgia,serif;font-size:29px}.stat span{font-size:11px;color:var(--muted)}.stack{display:grid;gap:12px}.card{min-height:260px;display:flex;flex-direction:column;justify-content:center;text-align:center}.card h3{font-size:26px}.card p{font-size:17px}.figure{width:100%;height:auto;display:block;margin:14px auto}figure{margin:0}figcaption{font-size:12px;color:var(--muted);margin:10px 0}.small{font-size:12px!important;color:var(--muted)}#notice{font-size:13px;white-space:pre-line}footer{border-top:1px solid var(--line);padding:22px 0 36px;margin-top:32px;font-size:11px;color:var(--muted)}footer p{margin:8px 0}summary{min-height:44px;display:flex;align-items:center;font-size:13px}details p{font-size:13px}input[type=file]{max-width:100%;font-size:12px}progress{width:100%;height:4px;accent-color:var(--accent)}.history{padding-left:20px;font-size:13px}.empty{text-align:center;padding:35px 16px}@media(max-width:380px){.shell{padding-left:14px;padding-right:14px}.panel{padding:18px}.edition{font-size:8px}nav button{font-size:13px}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s,border-color .15s}}