:root{--canvas-blue: #0374b5;--canvas-blue-dk: #0366a0;--ink: #2d3b45;--muted: #6b7780;--line: #c7cdd1;--bg: #f5f5f5;--ok: #03893d;--bad: #e62429;--header: #394b58}*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 Lato,Helvetica Neue,Helvetica,Arial,sans-serif}.top{background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;position:sticky;top:0;z-index:5}.top h1{margin:0;font-size:16px;font-weight:700}.top .sub{color:var(--muted);font-size:13px;margin-top:2px}.top .top-right{display:flex;align-items:center;gap:14px}.exit{color:var(--canvas-blue);font-size:13.5px;white-space:nowrap;text-decoration:none}.exit:hover{text-decoration:underline}.btn{appearance:none;font:inherit;cursor:pointer;border-radius:3px;padding:8px 14px;border:1px solid transparent}.btn-primary{background:var(--canvas-blue);color:#fff;font-weight:700}.btn-primary:hover{background:var(--canvas-blue-dk)}.btn-primary:disabled{background:#8eaaba;cursor:not-allowed}.btn-secondary{background:#fff;border-color:var(--line);color:var(--ink)}.wrap{max-width:960px;margin:0 auto;padding:28px 16px 60px}.intro{background:#fff;border:1px solid var(--line);padding:24px 28px}.intro h2{margin:0 0 8px;font-size:22px}.intro p{margin:0 0 12px;color:var(--ink)}.intro dl{display:grid;grid-template-columns:140px 1fr;gap:6px 12px;margin:18px 0 22px;font-size:14.5px}.intro dt{color:var(--muted);font-weight:700}.intro dd{margin:0}.player{display:none;min-height:calc(100vh - 52px)}.player.on{display:grid;grid-template-columns:72px 1fr}@media(max-width:720px){.player.on{grid-template-columns:1fr;grid-template-rows:auto 1fr auto}.qnav{flex-direction:row;flex-wrap:wrap;width:100%;border-right:0;border-bottom:1px solid var(--line);padding:8px}}.qnav{background:#fff;border-right:1px solid var(--line);padding:12px 8px;display:flex;flex-direction:column;gap:8px;align-items:center}.qnav button{width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:#fff;color:var(--ink);font:700 14px Lato,sans-serif;cursor:pointer;padding:0}.qnav button.current{border:2px solid var(--canvas-blue);color:var(--canvas-blue)}.qnav button.answered{background:#e6f1f8;border-color:var(--canvas-blue)}.stage{padding:28px 32px 90px;max-width:760px}.qhead{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:10px}.qhead h2{margin:0;font-size:18px}.qhead .pts{color:var(--muted);font-size:14px}.tagline{color:var(--muted);font-size:14px;margin:0 0 10px}.stem{margin:0 0 16px;font-size:16px}figure{margin:0 0 18px}figure img{max-width:100%;max-height:280px;background:#fff}figcaption{color:var(--muted);font-size:12.5px;margin-top:6px}.choices{display:flex;flex-direction:column;gap:10px;margin:8px 0 0}.choices label{display:flex;gap:10px;align-items:flex-start;cursor:pointer;font-size:16px}.choices input{margin-top:4px;accent-color:var(--canvas-blue)}.essay-box{margin-top:8px}.essay-box .part{font-weight:700;margin:14px 0 4px}textarea{width:100%;min-height:110px;font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:3px;background:#fff}.foot{position:sticky;bottom:0;background:#fff;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:10px;padding:10px 16px}.results{display:none;max-width:760px;margin:0 auto;padding:28px 16px 60px}.results.on{display:block}.results .card{background:#fff;border:1px solid var(--line);padding:22px 24px}.score{font-size:28px;font-weight:700;margin:8px 0 12px}.item{border:1px solid var(--line);border-radius:4px;padding:14px 14px 14px 16px;margin:12px 0}.item.ok-item{border-left:6px solid var(--ok);background:#eaf6ee}.item.bad-item{border-left:6px solid var(--bad);background:#fdecea}.item .ok{color:var(--ok);font-weight:700}.item .bad{color:var(--bad);font-weight:700}.why{color:var(--muted);font-size:14.5px;margin-top:6px}.opt-row{display:flex;gap:8px;align-items:flex-start;padding:7px 10px;border-radius:3px;margin:4px 0;background:#fff;border:1px solid var(--line)}.opt-row.right{background:#c8e6d0;border-color:var(--ok);color:#0b5c32;font-weight:700}.opt-row.wrong{background:#f8c9c7;border-color:var(--bad);color:#8e1b18;font-weight:700}.mark{min-width:1.4em;font-weight:700}.essay-rev{white-space:pre-wrap;background:#fff;border:1px solid var(--line);padding:8px 10px;border-radius:3px;margin:6px 0}.essay-rev.right{background:#c8e6d0;border-color:var(--ok)}.essay-rev.wrong{background:#f8c9c7;border-color:var(--bad)}.hide{display:none!important}