/* Makers in Training — course platform
   Build target: Chrome 90 (refurbished Chromebook AUE floor).
   No :has(), no container queries. Layout target 1366x768 (~640px usable). */

:root{
  --bg:#f4f6f9; --card:#fff; --ink:#16202e; --muted:#5b6b80;
  --line:#dbe2ec; --brand:#1d63c4; --brand-ink:#12447f;
  --ok:#0f7a4d; --ok-bg:#e6f5ee; --warn:#a4560a; --warn-bg:#fdf1e3;
  --err:#a4241a;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  background:var(--bg);color:var(--ink);
  font:15px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:1080px;margin:0 auto;padding:14px 18px 24px}
[hidden]{display:none !important}

/* ---- login ---- */
.center{min-height:100%;display:flex;align-items:center;justify-content:center;padding:20px}
.login{width:100%;max-width:380px;background:var(--card);border:1px solid var(--line);
       border-radius:12px;padding:28px 26px;box-shadow:0 2px 8px rgba(16,32,56,.07)}
.login h1{font-size:19px;margin:0 0 4px}
.login .sub{font-size:13.5px;color:var(--muted);margin:0 0 20px}
.field{margin-bottom:14px}
.field label{display:block;font-size:12px;font-weight:700;letter-spacing:.05em;
             text-transform:uppercase;color:var(--muted);margin-bottom:5px}
.field input{
  width:100%;font:inherit;font-size:17px;padding:11px 13px;
  border:1.5px solid var(--line);border-radius:8px;background:#fff;color:inherit;
}
.field input:focus{outline:2px solid var(--brand);outline-offset:1px;border-color:var(--brand)}
.field input.code{text-transform:uppercase;letter-spacing:.12em;font-weight:700}
.field input.pin{letter-spacing:.4em;font-weight:700}
.err{background:#fdecea;border:1px solid #f3c4bf;color:var(--err);
     border-radius:8px;padding:10px 12px;font-size:13.5px;margin-bottom:14px}
.help{font-size:12.5px;color:var(--muted);margin-top:14px;text-align:center}

/* ---- shell ---- */
.top{display:flex;align-items:center;gap:14px;margin-bottom:12px;flex-wrap:wrap}
.brand{font-weight:700;font-size:15px;letter-spacing:-.01em}
.brand span{color:var(--muted);font-weight:500}
.who{margin-left:auto;font-size:13px;color:var(--muted)}
.meta{display:flex;align-items:center;gap:12px;margin-bottom:8px;font-size:13px;color:var(--muted)}
.meta strong{color:var(--ink)}
.bar{height:8px;background:#e2e8f1;border-radius:99px;overflow:hidden;margin-bottom:16px}
.bar i{display:block;height:100%;width:0;background:var(--brand);border-radius:99px;
       transition:width .35s ease}

/* ---- card / item ---- */
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;
      padding:20px 22px;box-shadow:0 1px 2px rgba(16,32,56,.05)}
.tag{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.06em;
     text-transform:uppercase;color:var(--brand-ink);background:#e8f0fb;
     padding:3px 8px;border-radius:5px;margin-bottom:12px}
.passage{background:#f8fafc;border-left:3px solid var(--line);padding:10px 14px;
         margin:0 0 14px;font-size:14px;color:#2c3a4d;max-height:170px;overflow:auto}
.passage h3{margin:0 0 6px;font-size:14px}
.stem{font-size:17px;line-height:1.4;margin:0 0 16px;font-weight:500}
/* Kuta-sourced items are cropped images — the choices are inside the picture,
   so the buttons below carry the letter only. */
.item-img{max-width:100%;height:auto;display:block;margin:0 0 2px}
.choice.letter-only{padding:9px 14px;display:inline-flex;width:auto;margin-right:8px}
.choices.lettered{display:flex;flex-wrap:wrap;gap:8px}

.choices{display:grid;gap:8px}
.choice{display:flex;align-items:flex-start;gap:11px;width:100%;text-align:left;
        background:#fff;border:1.5px solid var(--line);border-radius:8px;
        padding:11px 14px;font:inherit;color:inherit;cursor:pointer}
.choice:hover{border-color:#b9c6d8;background:#fbfcfe}
.choice .k{flex:0 0 24px;height:24px;border-radius:6px;background:#eef2f7;color:var(--muted);
           font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}
.choice.sel{border-color:var(--brand);background:#f2f7fe}
.choice.sel .k{background:var(--brand);color:#fff}
.choice.right{border-color:var(--ok);background:var(--ok-bg)}
.choice.right .k{background:var(--ok);color:#fff}
.choice.wrong{border-color:var(--warn);background:var(--warn-bg)}
.choice.wrong .k{background:var(--warn);color:#fff}
.choice[disabled]{cursor:default}

.numeric input{font:inherit;font-size:20px;padding:10px 14px;width:200px;
  border:1.5px solid var(--line);border-radius:8px;background:#fff;color:inherit}
.numeric input:focus{outline:2px solid var(--brand);outline-offset:1px;border-color:var(--brand)}

/* Feedback is never punitive: a miss costs time and a re-read, not points. */
.fb{margin-top:14px;padding:12px 14px;border-radius:8px;font-size:14px}
.fb.good{background:var(--ok-bg);color:#0b5c3a;border:1px solid #b7e2ce}
.fb.learn{background:var(--warn-bg);color:#7a4108;border:1px solid #f0d5b2}
.fb b{display:block;margin-bottom:3px}

.actions{display:flex;align-items:center;gap:12px;margin-top:16px}
.btn{background:var(--brand);color:#fff;border:0;border-radius:8px;
     padding:11px 26px;font:inherit;font-weight:600;cursor:pointer}
.btn:hover{background:var(--brand-ink)}
.btn[disabled]{background:#c3cede;cursor:default}
.btn.wide{width:100%;padding:13px;font-size:16px}
.hint{font-size:12.5px;color:var(--muted)}
.hint kbd{background:#eef2f7;border:1px solid var(--line);border-bottom-width:2px;
          border-radius:4px;padding:1px 5px;font:inherit;font-size:11px}

/* ---- results ---- */
.rows{display:grid;gap:8px;margin-top:6px}
.row{display:grid;grid-template-columns:130px 1fr 54px;align-items:center;gap:12px}
.row .lbl{font-weight:600;font-size:14px;text-transform:capitalize}
.track{height:22px;background:#eef2f7;border-radius:6px;overflow:hidden}
.track i{display:block;height:100%;background:var(--brand);border-radius:6px;
         transition:width .5s ease}
.row .num{text-align:right;font-variant-numeric:tabular-nums;font-weight:700;font-size:14px}
h2{font-size:16px;margin:0 0 4px}
.sub{font-size:13px;color:var(--muted);margin:0 0 16px}
.note{font-size:12.5px;color:var(--muted);margin-top:14px;padding-top:12px;
      border-top:1px solid var(--line)}

/* ---- connection state ---- */
.offline{position:fixed;left:0;right:0;bottom:0;background:var(--warn-bg);
         border-top:1px solid #f0d5b2;color:#7a4108;font-size:13px;
         padding:9px 16px;text-align:center}
.demo{background:#eef2f7;border:1px solid var(--line);color:var(--muted);
      font-size:12.5px;border-radius:6px;padding:7px 11px;margin-bottom:12px}