:root{
  --navy:#1d3557; --amber:#e8a020; --ink:#1a1a1a; --muted:#5a6570;
  --ok:#1e7d32; --no:#b3261e; --line:#d7dde3; --bg:#f4f6f8;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.45}
.hidden{display:none !important}
header#topbar{display:flex;justify-content:space-between;align-items:center;
  background:var(--navy);color:#fff;padding:.6rem 1rem}
header .brand{font-weight:700;font-size:1.15rem}
header .badge{background:var(--amber);color:#20160a;border-radius:1rem;
  padding:.05rem .55rem;font-size:.78rem;font-weight:600}
header button{margin-left:.6rem}
main{max-width:880px;margin:0 auto;padding:1rem}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;
  padding:1rem 1.2rem;margin-bottom:1rem}
h1{margin:.2rem 0;color:var(--navy)}
h2{color:var(--navy);border-bottom:2px solid var(--amber);padding-bottom:.25rem}
h3{margin-bottom:.4rem}
.sub{color:var(--muted)}
.error{color:var(--no);min-height:1.2em}
.ok{color:var(--ok)}
.status{font-weight:600}
.status.ok{color:var(--ok)} .status.no{color:var(--no)}
label{display:block;margin:.55rem 0}
input[type=text],input[type=password],input[type=number],input:not([type]),select,textarea{
  width:100%;padding:.5rem;border:1px solid var(--line);border-radius:6px;
  font-size:1rem;background:#fff}
textarea.essay{min-height:6.5rem;resize:vertical}
button{cursor:pointer;border:1px solid var(--navy);background:#fff;color:var(--navy);
  border-radius:6px;padding:.45rem .9rem;font-size:.95rem}
button.primary{background:var(--navy);color:#fff}
button[aria-pressed="true"]{background:var(--amber);border-color:var(--amber);color:#20160a;font-weight:700}
.tabs{display:flex;gap:.4rem;margin-bottom:.6rem}
.tab.active{background:var(--navy);color:#fff}
.progress-track{background:#e6ebef;border-radius:1rem;height:1rem;overflow:hidden}
#prog-fill{background:var(--amber);height:100%;width:0%}
.pick-row{display:flex;gap:.5rem;flex-wrap:wrap}
.sec{margin-top:1.1rem}
.sec h3{color:var(--navy)}
.sec h4{color:var(--navy);margin:.9rem 0 .2rem}
.day-chips{display:flex;gap:.4rem;flex-wrap:wrap;margin:.3rem 0 .5rem}
.day{margin-top:1.4rem}
.day-title{color:var(--navy);border-bottom:2px solid var(--amber);
  padding-bottom:.25rem}
.block{border:1px solid var(--line);border-radius:8px;
  padding:.7rem 1rem;margin:.7rem 0;background:#fff}
.block-label{margin:0 0 .15rem;font-size:.72rem;font-weight:700;
  letter-spacing:.08em;color:var(--muted)}
.block-title{margin:.1rem 0 .4rem;color:var(--navy)}
.block p{margin:.45rem 0}
.block-decision{border:2px solid var(--amber);background:#fffaf0}
.block-decision .block-label{color:#9a6a00}
.block-story{background:#f2f7fb;border-left:4px solid var(--navy)}
.block-ailab{background:#eef2f5;border-left:4px solid var(--amber)}
.block img{max-width:100%;height:auto;display:block;margin:.6rem auto;
  border-radius:6px}
.block blockquote{background:#fff;border-left:3px solid var(--amber);
  margin:.5rem 0;padding:.4rem .8rem}
.block blockquote p{margin:.3rem 0}
.block table{width:auto;min-width:60%}
.q{border-top:1px solid var(--line);padding:.7rem 0}
.q .prompt{margin:.2rem 0 .5rem;font-weight:600}
.q .prompt-es{color:var(--muted);font-weight:400;font-size:.92rem}
.q .field{display:grid;grid-template-columns:1fr auto;gap:.5rem;align-items:end;margin:.35rem 0}
.q .field label{margin:0;font-size:.92rem;color:var(--muted)}
.q .field input,.q .field select{max-width:340px}
.q .mark{font-weight:700}
.q .mark.ok{color:var(--ok)} .mark.no{color:var(--no)}
table{border-collapse:collapse;width:100%}
th,td{border-bottom:1px solid var(--line);padding:.4rem .5rem;text-align:left}
tbody tr{cursor:pointer}
tbody tr:hover{background:#fdf3e0}
#answer-key .ak-q{border-top:1px solid var(--line);padding:.4rem 0}
#answer-key code{background:#eef2f5;padding:.05rem .35rem;border-radius:4px}
.grade-view{background:#fdf6e5;border:1px solid var(--amber);border-radius:8px;padding:.6rem .9rem}