:root{
  --bar:#0f3a4a; --bar2:#16536a; --accent:#1a7f9a; --accent-d:#126276; --accent-l:#e3f2f6;
  --ink:#1b2125; --muted:#5a666e; --line:#d3dadf; --bg:#ffffff; --page:#eef2f4; --soft:#f6f8f9;
  --ok:#1d7a3c; --ok-bg:#e5f4ea; --bad:#b3261e; --bad-bg:#fbe9e8; --warn:#9a5b00; --hl:#fff1a8;
  --serif:"Source Serif 4", Georgia, serif; --sans:"Source Sans 3", "Segoe UI", Arial, sans-serif;
  color-scheme: light;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:var(--sans);color:var(--ink);background:var(--page);font-size:17px;line-height:1.5;-webkit-font-smoothing:antialiased}
button{font-family:inherit;font-size:inherit;cursor:pointer}
button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #f2b705;outline-offset:2px}
h1,h2,h3{line-height:1.2;margin:0}
.hidden{display:none!important}

/* ---------- Home ---------- */
.home{max-width:1100px;margin:0 auto;padding:28px 16px 60px}
.brand{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.brand-mark{width:40px;height:40px;border-radius:9px;background:var(--bar2);color:#fff;display:grid;place-items:center;font-weight:700;font-size:18px;flex:none}
.brand h1{font-size:28px}
.tagline{color:var(--muted);margin:4px 0 22px}
.notice{background:#fff8e6;border:1px solid #f0d99a;border-radius:8px;padding:10px 14px;font-size:15px;color:#5c4400;margin-bottom:24px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;display:flex;flex-direction:column;gap:10px}
.card h2{font-size:21px}
.card .meta{color:var(--muted);font-size:15px}
.card ul{margin:0;padding-left:18px;font-size:15px;color:#374248}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.select{font:inherit;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;min-width:140px}
.btn{border:1px solid var(--accent);background:#fff;color:var(--accent-d);border-radius:999px;padding:8px 18px;font-weight:600}
.btn:hover{background:var(--accent-l)}
.btn.primary{background:var(--accent);color:#fff}
.btn.primary:hover{background:var(--accent-d)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.section-title{font-size:20px;margin:34px 0 12px}
.drills{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}
.drill{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;text-align:left;display:flex;flex-direction:column;gap:4px}
.drill:hover{border-color:var(--accent);background:#fbfeff}
.drill b{font-size:16px}
.drill span{font-size:14px;color:var(--muted)}
.tag{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--accent-d);background:var(--accent-l);border-radius:4px;padding:1px 7px;width:max-content}
table.hist{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;font-size:15px}
.hist th,.hist td{padding:8px 12px;border-bottom:1px solid var(--line);text-align:left}
.hist th{background:var(--soft);font-weight:600}
.empty{color:var(--muted);font-size:15px}
footer.foot{margin-top:40px;color:var(--muted);font-size:13px}

/* ---------- Test shell ---------- */
.test{display:flex;flex-direction:column;height:100vh;height:100dvh;background:var(--bg)}
.topbar{background:var(--bar);color:#fff;display:flex;align-items:center;gap:14px;padding:0 14px;min-height:58px;flex:none}
.topbar .logo{font-weight:700;letter-spacing:.02em;font-size:16px;white-space:nowrap;display:flex;align-items:center;gap:8px}
.topbar .logo .brand-mark{width:28px;height:28px;font-size:13px;border-radius:6px;background:#2b7a93}
.topbar .sect{font-size:15px;opacity:.9;white-space:nowrap}
.topbar .spacer{flex:1}
.tbtn{background:transparent;border:1px solid rgba(255,255,255,.55);color:#fff;border-radius:999px;padding:6px 16px;font-size:15px;font-weight:600;white-space:nowrap}
.tbtn:hover{background:rgba(255,255,255,.12)}
.tbtn.next{background:#fff;color:var(--bar);border-color:#fff}
.tbtn.next:hover{background:#dff0f5}
.tbtn:disabled{opacity:.35;cursor:not-allowed}
.subbar{background:var(--bar2);color:#e6f2f5;display:flex;align-items:center;gap:16px;padding:6px 16px;font-size:15px;flex:none}
.subbar .qcount{font-weight:600}
.timer{display:flex;align-items:center;gap:8px;margin-left:auto}
.timer .clock{font-variant-numeric:tabular-nums;font-weight:700;font-size:16px;min-width:64px;text-align:right}
.timer .clock.low{color:#ffd166}
.linkbtn{background:none;border:none;color:#cfe8ef;text-decoration:underline;font-size:14px;padding:0}
.stage{flex:1;overflow:hidden;display:flex;min-height:0}
.pane{overflow:auto;padding:26px 32px 40px}
.split{display:grid;grid-template-columns:1fr 1fr;width:100%;min-height:0}
.split > .pane:first-child{border-right:1px solid var(--line);background:#fff}
.single{width:100%;overflow:auto}
.single .inner{max-width:880px;margin:0 auto;padding:30px 24px 60px}
.direction{font-weight:700;font-size:18px;margin-bottom:14px}
.task-label{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--accent-d);margin-bottom:6px}

/* passages */
.passage{font-family:var(--serif);font-size:17.5px;line-height:1.7}
.passage h3{font-family:var(--sans);font-size:19px;margin-bottom:12px;text-align:center}
.passage p{margin:0 0 14px}
.passage .hl{background:var(--hl);font-weight:600;padding:0 2px}
.ins-mark{display:inline-block;width:16px;height:16px;background:#222;vertical-align:-2px;margin:0 3px;border:none;padding:0;border-radius:2px}
.ins-mark:hover{background:var(--accent)}
.inserted{background:var(--accent-l);font-weight:600;border-bottom:2px solid var(--accent);cursor:pointer}
.doc{border:1px solid var(--line);border-radius:6px;background:#fff;font-family:var(--sans);font-size:16.5px;line-height:1.6;box-shadow:0 1px 3px rgba(0,0,0,.05)}
.doc .doc-head{background:var(--soft);border-bottom:1px solid var(--line);padding:10px 16px;font-size:14.5px;color:#3a454c}
.doc .doc-head b{color:var(--ink)}
.doc .doc-title{font-size:19px;font-weight:700;padding:14px 16px 0}
.doc .doc-body{padding:10px 16px 16px}
.doc .doc-body p{margin:0 0 10px}
.doc .doc-body ul{margin:0 0 10px;padding-left:22px}
.doc.notice-k{border-top:5px solid var(--accent)}
.doc.ad-k{border:2px dashed #c99a2e;background:#fffdf6}
.chat{display:flex;flex-direction:column;gap:10px;padding:14px;background:#f2f4f6;border-radius:10px;font-family:var(--sans);font-size:16px}
.msg{max-width:82%;display:flex;flex-direction:column;gap:2px}
.msg .who{font-size:13px;color:var(--muted)}
.msg .bub{background:#fff;border:1px solid var(--line);border-radius:14px;padding:8px 12px}
.msg.me{align-self:flex-end}
.msg.me .who{text-align:right}
.msg.me .bub{background:#d9eef4;border-color:#bfdfe8}

/* questions */
.qtext{font-size:18px;font-weight:600;margin-bottom:16px}
.opts{display:flex;flex-direction:column;gap:10px}
.opt{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--line);border-radius:8px;padding:11px 14px;background:#fff;text-align:left;font-size:17px;width:100%}
.opt:hover{border-color:#97b9c4;background:#fbfdfe}
.opt .radio{width:20px;height:20px;border-radius:50%;border:2px solid #6b7a82;flex:none;margin-top:2px;display:grid;place-items:center}
.opt.sel{border-color:var(--accent);background:var(--accent-l)}
.opt.sel .radio{border-color:var(--accent)}
.opt.sel .radio::after{content:"";width:10px;height:10px;border-radius:50%;background:var(--accent)}
.opt.correct{border-color:var(--ok);background:var(--ok-bg)}
.opt.wrong{border-color:var(--bad);background:var(--bad-bg)}
.ins-box{border:1px dashed #8aa;border-radius:8px;padding:12px 14px;background:var(--soft);font-family:var(--serif);font-weight:600;margin:12px 0}

/* complete the words */
.ctw{font-family:var(--serif);font-size:19px;line-height:2.25}
.cw{white-space:nowrap;display:inline-flex;align-items:baseline}
.lb{width:21px;height:28px;border:none;border-bottom:2px solid #33434b;background:#f4f7f8;margin:0 1px;font:inherit;font-size:19px;text-align:center;padding:0;color:var(--ink);border-radius:3px 3px 0 0;text-transform:lowercase}
.lb:focus{background:#fff6cc;outline:none;border-bottom-color:var(--accent)}
.lb.ok{background:var(--ok-bg);border-bottom-color:var(--ok)}
.lb.no{background:var(--bad-bg);border-bottom-color:var(--bad)}
.fix{color:var(--ok);font-weight:600;font-size:15px;font-family:var(--sans);margin-left:2px}

/* build a sentence */
.bas{display:flex;flex-direction:column;gap:22px;margin-top:8px}
.person{display:flex;gap:14px;align-items:flex-start}
.avatar{width:46px;height:46px;border-radius:50%;flex:none;display:grid;place-items:center;font-weight:700;color:#fff}
.avatar.a{background:#7a5ea8}.avatar.b{background:#2a8a6e}
.speech{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:12px 16px;font-size:18px}
.slots{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:12px 14px;border:1px solid var(--line);border-radius:12px;min-height:62px;background:#fff;font-size:18px}
.slot{min-width:84px;height:40px;border-bottom:2px solid #45555d;display:inline-flex;align-items:center;justify-content:center;padding:0 4px}
.chip{border:1px solid #7da7b5;background:#eef7fa;color:var(--ink);border-radius:8px;padding:6px 12px;font-size:17px;font-weight:600}
.chip:hover{background:#dff0f5}
.chip.used{visibility:hidden}
.fixed-w{font-weight:600;padding:0 2px}
.bank{display:flex;flex-wrap:wrap;gap:10px;padding:14px;border:1px dashed #b8c6cc;border-radius:12px;background:#fafcfd;min-height:60px}
.bas-res{font-size:16px;padding:10px 14px;border-radius:8px}
.bas-res.ok{background:var(--ok-bg);color:var(--ok)}
.bas-res.no{background:var(--bad-bg);color:var(--bad)}

/* writing */
.wtask .scenario{font-size:17px;margin-bottom:12px}
.wtask ul{margin:6px 0 12px;padding-left:22px}
.board{border:1px solid var(--line);border-radius:10px;overflow:hidden}
.board .post{display:flex;gap:12px;padding:14px;border-bottom:1px solid var(--line);background:#fff}
.board .post:last-child{border-bottom:none}
.board .post.prof{background:#f4f8fa}
.board .post .avatar{width:40px;height:40px;font-size:14px}
.board .name{font-weight:700;font-size:15px;margin-bottom:2px}
.editor{display:flex;flex-direction:column;height:100%;min-height:340px}
.toolbar{display:flex;gap:6px;align-items:center;flex-wrap:wrap;border:1px solid var(--line);border-bottom:none;border-radius:8px 8px 0 0;background:var(--soft);padding:6px 8px}
.toolbar button{background:#fff;border:1px solid var(--line);border-radius:5px;padding:3px 12px;font-size:14px}
.toolbar .wc{margin-left:auto;font-size:14px;color:var(--muted);display:flex;gap:8px;align-items:center}
.editor textarea{flex:1;width:100%;min-height:300px;resize:none;border:1px solid var(--line);border-radius:0 0 8px 8px;padding:14px;font:inherit;font-size:17px;line-height:1.6}
.email-head{border:1px solid var(--line);border-bottom:none;font-size:15px;background:#fff}
.email-head div{padding:6px 12px;border-bottom:1px solid var(--line)}

/* directions + modal */
.dir-page{max-width:760px;margin:0 auto;padding:40px 24px}
.dir-page h2{font-size:26px;margin-bottom:14px}
.dir-page p,.dir-page li{font-size:17.5px}
.dir-page .callout{background:var(--soft);border-left:4px solid var(--accent);padding:12px 16px;border-radius:4px;margin:18px 0}
.overlay{position:fixed;inset:0;background:rgba(10,25,32,.55);display:grid;place-items:center;z-index:50;padding:16px}
.dialog{background:#fff;border-radius:12px;max-width:520px;width:100%;padding:24px;box-shadow:0 20px 50px rgba(0,0,0,.3)}
.dialog h3{font-size:20px;margin-bottom:10px}
.dialog .row{justify-content:flex-end;margin-top:20px}

/* results */
.results{max-width:1000px;margin:0 auto;padding:26px 16px 70px}
.scorebox{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;margin:16px 0 24px}
.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px}
.stat .k{font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-weight:700}
.stat .v{font-size:32px;font-weight:700;color:var(--bar)}
.stat .s{font-size:14px;color:var(--muted)}
.rev{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;margin-bottom:14px}
.rev h3{font-size:17px;margin-bottom:8px}
.rev .exp{font-size:15px;color:#33424a;background:var(--soft);border-radius:6px;padding:8px 12px;margin-top:8px}
.mark{font-weight:700}
.mark.ok{color:var(--ok)}.mark.no{color:var(--bad)}
.model{white-space:pre-wrap;background:var(--soft);border-radius:8px;padding:12px 14px;font-size:16px}
.yours{white-space:pre-wrap;background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px 14px;font-size:16px}
.checklist label{display:flex;gap:10px;align-items:flex-start;padding:4px 0;font-size:16px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.feedback-bar{border-top:1px solid var(--line);background:var(--soft);padding:10px 16px;display:flex;gap:12px;align-items:center;flex-wrap:wrap;flex:none}

@media (max-width: 820px){
  body{font-size:16px}
  .split{grid-template-columns:1fr;overflow:auto}
  .split > .pane:first-child{border-right:none;border-bottom:1px solid var(--line)}
  .stage{overflow:auto}
  .pane{padding:18px 16px 28px;overflow:visible}
  .topbar{flex-wrap:wrap;padding:8px 10px;gap:8px}
  .topbar .sect{display:none}
  .two{grid-template-columns:1fr}
  .single .inner{padding:20px 16px 40px}
}