*{box-sizing:border-box}
:root{--ink:#1c2430;--mut:#5d6878;--line:#d5dae1;--bg:#f3f5f8;--card:#fff;--acc:#1f4e8c;--acc2:#e8eff8;--ok:#1f7a4d;--bad:#b3261e;--warn:#9a6700}
html,body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
#app{min-height:100vh}
.wrap{max-width:980px;margin:0 auto;padding:20px 16px 60px}
h1{font-size:26px;margin:0 0 4px}h2{font-size:20px;margin:26px 0 10px}h3{font-size:16px;margin:18px 0 6px}
p{margin:8px 0}.mut{color:var(--mut)}.small{font-size:13px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px 20px;margin:14px 0}
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}
button{font:inherit;cursor:pointer;border:1px solid var(--line);background:#fff;color:var(--ink);padding:8px 14px;border-radius:7px}
button:hover{border-color:#9aa5b5}
button.pri{background:var(--acc);border-color:var(--acc);color:#fff}
button.pri:hover{background:#173d70}
button.dan{color:var(--bad)}
button.on{background:#fff3cd;border-color:#d9a400}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.pill{display:inline-block;font-size:12px;padding:2px 9px;border-radius:99px;background:var(--acc2);color:var(--acc);font-weight:600}
.pill.g{background:#e3f4ea;color:var(--ok)}.pill.y{background:#fff3cd;color:var(--warn)}
table{border-collapse:collapse;width:100%;margin:8px 0}
th,td{border:1px solid var(--line);padding:6px 10px;text-align:left;font-size:14.5px;vertical-align:top}
th{background:#eef1f5}
td.n,th.n{text-align:right}

/* test chrome */
.bar{position:sticky;top:0;z-index:5;background:#26364d;color:#fff;padding:9px 16px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.bar .ttl{font-weight:600;margin-right:auto}
.bar button{background:#3a4d69;border-color:#4d627f;color:#fff;padding:6px 11px;font-size:14px}
.bar button:hover{background:#4a5f7d}
.bar button.on{background:#d9a400;border-color:#d9a400;color:#1c2430}
.timer{font-variant-numeric:tabular-nums;font-weight:700;font-size:17px;min-width:62px;text-align:center}
.timer.low{color:#ffb4a9}
.stage{max-width:1180px;margin:0 auto;padding:22px 18px 80px}
.split{display:grid;grid-template-columns:1fr 1fr;gap:22px}
@media(max-width:860px){.split{grid-template-columns:1fr}}
.pane{background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px 20px}
.passage{font-family:Georgia,"Times New Roman",serif;font-size:16.5px;line-height:1.65;max-height:72vh;overflow:auto}
.passage p{margin:0 0 12px}
.qtext{font-family:Georgia,"Times New Roman",serif;font-size:17.5px;line-height:1.6}
.direct{font-size:13.5px;color:var(--mut);margin-bottom:10px}
.opt{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;margin:5px 0;border:1px solid transparent;border-radius:7px;cursor:pointer;font-family:Georgia,serif;font-size:16.5px}
.opt:hover{background:#f3f6fa}
.opt.sel{background:var(--acc2);border-color:#9db8dc}
.opt input{margin-top:5px;accent-color:var(--acc)}
.qcbox{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 0;text-align:center}
.qcbox div{border:1px solid var(--line);border-radius:7px;padding:12px;font-family:Georgia,serif;font-size:17px}
.qcbox b{display:block;font-family:-apple-system,sans-serif;font-size:13px;color:var(--mut);margin-bottom:6px;text-decoration:underline}
.given{text-align:center;font-family:Georgia,serif;font-size:17px;margin:8px 0}
.blanks{display:flex;gap:14px;flex-wrap:wrap;margin-top:14px}
.blank{border:1px solid var(--line);border-radius:7px;overflow:hidden;min-width:170px}
.blank .bh{background:#eef1f5;font-size:13px;text-align:center;padding:4px;color:var(--mut)}
.blank .bc{padding:9px 14px;cursor:pointer;border-top:1px solid var(--line);font-family:Georgia,serif;text-align:center}
.blank .bc:hover{background:#f3f6fa}.blank .bc.sel{background:#26364d;color:#fff}
.ne{font:inherit;font-size:18px;padding:8px 10px;width:170px;border:1px solid #8794a6;border-radius:6px}
.foot{display:flex;justify-content:space-between;margin-top:18px}
.chart{max-width:560px;width:100%;height:auto;display:block;margin:6px auto}
.chart text{fill:#1c2430;font-family:-apple-system,Arial,sans-serif}
textarea.essay{width:100%;min-height:46vh;font:16px/1.6 Georgia,serif;padding:14px;border:1px solid #8794a6;border-radius:8px}
.rev td{cursor:pointer}.rev tr:hover td{background:#f3f6fa}

/* calculator */
.calc{position:fixed;right:18px;top:64px;z-index:9;background:#e9edf2;border:1px solid #8794a6;border-radius:9px;padding:10px;width:222px;box-shadow:0 6px 22px rgba(0,0,0,.18)}
.calc.hidden{display:none}
@media(max-width:860px){.calc{top:auto;bottom:12px;right:12px}}
.calc .cd{background:#fff;border:1px solid #8794a6;border-radius:5px;text-align:right;padding:6px 8px;font:20px/1.3 ui-monospace,Menlo,monospace;margin-bottom:8px;overflow:hidden}
.calc .ck{display:grid;grid-template-columns:repeat(5,1fr);gap:5px}
.calc .ck button{padding:8px 0;font-size:15px}

/* results */
.big{font-size:30px;font-weight:700}
.kpi{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.kpi .card{margin:0}
details.rc{background:#fff;border:1px solid var(--line);border-left:5px solid var(--ok);border-radius:8px;margin:8px 0;padding:0 14px}
details.rc.bad{border-left-color:var(--bad)}
details.rc>summary{cursor:pointer;padding:10px 0;font-weight:600;font-size:15px}
details.rc .qtext{font-size:16px}
details.pz{margin:6px 0 10px;background:#fafbfc;border:1px dashed var(--line);border-radius:6px;padding:4px 12px}
.ex{background:#f6f9f2;border:1px solid #d6e3c6;border-radius:7px;padding:10px 14px;margin:10px 0;font-size:15px}
.ex b{color:#2d5a12}
.lst{margin:6px 0;padding-left:0;list-style:none;font-family:Georgia,serif}
.lst li{padding:2px 0}.lst li.c{color:var(--ok);font-weight:700}.lst li.w{color:var(--bad);text-decoration:line-through}
select{font:inherit;font-size:14px;padding:4px 6px;border-radius:6px;border:1px solid var(--line)}
textarea.exp{width:100%;height:200px;font:12.5px/1.4 ui-monospace,Menlo,monospace}
.guide h3{margin-top:22px;color:var(--acc)}
.guide li{margin:4px 0}
.note{background:#fff8e1;border:1px solid #ecd58a;border-radius:8px;padding:10px 14px;font-size:14.5px}
sup{font-size:.7em;line-height:0}