:root {
  --bg: #f6f7f9; --card: #fff; --text: #1d2330; --muted: #667085; --border: #e3e6eb;
  --accent: #2554c7; --accent-text: #fff;
  --s-not: #98a2b3; --s-prog: #b54708; --s-up: #2554c7; --s-check: #067647;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #12151b; --card: #1a1f27; --text: #e6e9ef; --muted: #98a2b3; --border: #2b313c;
          --accent: #7aa2ff; --accent-text: #0b1020; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
.container { max-width: 980px; margin: 0 auto; padding: 24px 16px 64px; }
.topbar { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px;
          background: var(--card); border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; text-decoration: none; color: var(--text); }
.who { display: flex; gap: 12px; align-items: center; color: var(--muted); }
.who form { margin: 0; }
button { font: inherit; cursor: pointer; border: 1px solid var(--border); background: var(--card);
         color: var(--text); padding: 6px 12px; border-radius: 8px; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
button.link { border: 0; background: none; color: var(--accent); padding: 0; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; margin: 16px 0; }
.muted { color: var(--muted); } .small { font-size: .85em; font-weight: 400; }
h1 { margin: 0 0 8px; font-size: 1.6rem; } h2 { font-size: 1.2rem; }
.login { max-width: 360px; margin: 60px auto; }
.login form, .upload { display: grid; gap: 12px; }
label { display: grid; gap: 4px; font-size: .9rem; color: var(--muted); }
input { font: inherit; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px;
        background: var(--bg); color: var(--text); }
.alert { padding: 8px 12px; border-radius: 8px; }
.alert.error { background: #fee4e2; color: #912018; } .alert.ok { background: #dcfae6; color: #085d3a; }
.subject-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin: 28px 0 4px; border-bottom: 1px solid var(--border); }
.subject-tabs .tab { border: 0; border-bottom: 3px solid transparent; border-radius: 0; background: none;
                     padding: 8px 14px; font-weight: 600; color: var(--muted); margin-bottom: -1px; }
.subject-tabs .tab[aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); }
.subject-tabs .count { font-size: .75rem; font-weight: 600; padding: 0 7px; border-radius: 999px;
                       background: var(--border); color: var(--muted); margin-left: 4px; }
.notice { background: var(--card); border: 1px solid var(--border); border-left: 4px solid var(--accent);
          border-radius: 10px; padding: 10px 16px; margin: 8px 0 4px; }
.notice ul { margin: 6px 0 0; padding-left: 20px; }
.notice li { margin: 2px 0; }
[hidden] { display: none !important; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.tests { background: var(--card); border: 1px solid var(--border); border-radius: 12px; }
table.tests th { font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); }
table.asset { width: auto; margin: 8px 0; } table.asset th, table.asset td { border: 1px solid var(--border); }
table.blank td { min-width: 70px; height: 28px; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: .8rem; font-weight: 600;
         color: #fff; white-space: nowrap; }
.badge.not_started { background: var(--s-not); } .badge.in_progress { background: var(--s-prog); }
.badge.uploaded { background: var(--s-up); } .badge.checked { background: var(--s-check); }
.crumbs { font-size: .9rem; }
.test-head { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.status-box { min-width: 220px; }
.status-box dl { display: grid; grid-template-columns: auto 1fr; gap: 2px 12px; margin: 8px 0; font-size: .9rem; }
.status-box dt { color: var(--muted); } .status-box dd { margin: 0; }
.problem h2 { display: flex; justify-content: space-between; gap: 8px; }
.pts { color: var(--muted); font-weight: 500; font-size: .9rem; white-space: nowrap; }
.part { border-top: 1px dashed var(--border); padding-top: 12px; margin-top: 12px; }
.part-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.part-head .label { font-weight: 700; }
.atype { font-size: .75rem; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--border); color: var(--muted); }
pre.code { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px; overflow-x: auto; font-size: .88rem; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.feedback { border-left: 4px solid var(--s-check); background: rgba(6,118,71,.08); padding: 8px 12px; border-radius: 6px; margin-top: 8px; }
.math.block { overflow-x: auto; }
a.button { display: inline-block; text-decoration: none; padding: 6px 12px; border-radius: 8px;
           border: 1px solid var(--border); }
a.button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
button.danger { color: #b42318; }
.section-title { margin-top: 28px; }
/* weekly cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; }
.wcard { display: block; margin: 0; text-decoration: none; color: var(--text); border-top: 4px solid var(--s-prog); }
.wcard.met { border-top-color: var(--s-check); }
.wsubject { font-weight: 700; }
.wcount { font-size: 1.1rem; margin: 6px 0; } .wcount strong { font-size: 1.8rem; }
.wnote { font-size: .9rem; margin-top: 6px; }
.wcard.met .wnote { color: var(--s-check); font-weight: 600; }
.whistory { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; }
.chip { font-size: .72rem; padding: 1px 7px; border-radius: 999px; border: 1px solid var(--border); color: var(--muted); }
.chip.met { border-color: var(--s-check); color: var(--s-check); }
.bar { height: 8px; background: var(--border); border-radius: 999px; overflow: hidden; margin: 6px 0; }
.bar > span { display: block; height: 100%; background: var(--accent); }
.wcard.met .bar > span { background: var(--s-check); }
.bar.small { height: 6px; margin: 4px 0; min-width: 90px; }
td.prog { min-width: 130px; }
.badge.partial { background: #7a5af8; }
.done-tag { font-size: .75rem; color: var(--s-check); font-weight: 600; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
/* uploads + picker */
table.uploads td, table.uploads th { font-size: .92rem; }
.picker { border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; }
.picker legend { padding: 0 6px; color: var(--muted); font-size: .9rem; }
label.check { display: inline-flex; gap: 6px; align-items: center; color: var(--text); font-size: .95rem; }
.picker .all { margin-bottom: 8px; }
.pick-questions { display: flex; flex-wrap: wrap; gap: 8px 22px; padding-top: 6px; border-top: 1px dashed var(--border); }
.q-opt.is-done b { color: var(--s-check); }
.completed table.tests td:first-child { white-space: nowrap; }
@media print {
  .no-print, .topbar { display: none !important; }
  body { background: #fff; color: #000; }
  .card { border: 0; padding: 0; }
  details { display: block; } details > * { display: block; }
  .problem { page-break-inside: auto; }
}