/* Student Hub. Builds on style.css tokens. */
header.top h1 a.home { color: inherit; text-decoration: none; white-space: nowrap; }
header.top .inner { flex-wrap: wrap; row-gap: 4px; padding-top: 8px; padding-bottom: 8px; }
header.top nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
header.top nav a { margin-left: 0; white-space: nowrap; }

.hub-intro { margin: 4px 0 20px; }
.hub-intro h2 { font-size: 24px; margin: 0 0 6px; }

.subjects { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
a.subject {
  display: flex; flex-direction: column; gap: 6px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; color: var(--text); text-decoration: none; min-height: 150px;
  transition: border-color .15s, transform .15s;
}
a.subject:hover, a.subject:focus-visible { border-color: var(--accent); transform: translateY(-2px); outline: none; }
a.subject .icon { font-size: 30px; line-height: 1; }
a.subject .name { font-weight: 700; font-size: 16.5px; }
a.subject .sum { color: var(--muted); font-size: 13.5px; flex: 1; }
a.subject .counts { display: flex; flex-wrap: wrap; gap: 6px; }

.back { display: inline-block; margin-bottom: 14px; font-size: 14px; text-decoration: none; }
.subject-head { display: flex; gap: 14px; align-items: center; margin-bottom: 8px; }
.subject-head .icon { font-size: 40px; line-height: 1; }
.subject-head h2 { margin: 0; font-size: 24px; }
.subject-head p { margin: 2px 0 0; color: var(--muted); }

.jump { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 20px; }
.jump a { text-decoration: none; }

.card h3 { margin: 0 0 4px; font-size: 16px; }
.empty { color: var(--muted); font-size: 14px; margin: 6px 0 0; }

.announce { border-left: 3px solid var(--accent); padding: 8px 12px; margin: 10px 0; background: var(--surface-2); border-radius: 0 8px 8px 0; }
.announce .date { font-size: 12.5px; color: var(--muted); }

.unit { margin-top: 14px; }
.unit h4 { margin: 0 0 6px; font-size: 14.5px; }
ul.items { list-style: none; margin: 0; padding: 0; }
ul.items li { border-top: 1px solid var(--border); }
ul.items li:first-child { border-top: none; }
ul.items a { display: flex; gap: 10px; align-items: center; padding: 9px 4px; text-decoration: none; color: var(--text); }
ul.items a:hover { color: var(--accent); }
.type { font-size: 11.5px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--muted);
  border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; min-width: 52px; text-align: center; }

.labs { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; margin-top: 10px; }
a.lab { display: block; border: 1px solid var(--border); border-radius: 8px; padding: 12px; text-decoration: none;
  color: var(--text); background: var(--surface-2); }
a.lab:hover { border-color: var(--accent); }
a.lab strong { display: block; font-size: 14.5px; margin-bottom: 4px; }
a.lab .muted { font-size: 12.5px; }

/* Syllabus */
.course-line { margin: 4px 0 0; font-weight: 600; }
.syl-h { font-size: 14.5px; margin: 20px 0 8px; }
ol.cos { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
ol.cos li { display: flex; gap: 10px; align-items: baseline; font-size: 14.5px; }
.co { flex: none; font-weight: 700; font-size: 12px; line-height: 1; padding: 4px 7px; border-radius: 6px;
  background: var(--surface-2); border: 1px solid var(--border); }
details.syl-more { margin-top: 12px; font-size: 14px; }
details.syl-more summary, details.unitbox summary { cursor: pointer; }
details.syl-more ul { margin: 8px 0 0; padding-left: 20px; }
details.syl-more li { margin-bottom: 4px; }
details.unitbox { border: 1px solid var(--border); border-radius: 8px; margin: 8px 0; background: var(--surface); }
details.unitbox summary { position: relative; display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: center;
  padding: 10px 34px 10px 12px; list-style: none; }
details.unitbox summary::-webkit-details-marker { display: none; }
details.unitbox summary::after { content: "▸"; position: absolute; right: 14px; top: 50%; margin-top: -.6em;
  color: var(--muted); transition: transform .15s; }
details.unitbox[open] summary::after { transform: rotate(90deg); }
.uid { font: 700 12px/1 var(--mono); padding: 4px 8px; border-radius: 6px; background: var(--accent); color: var(--accent-text); }
.ut { font-weight: 600; }
details.unitbox ul { margin: 0; padding: 0 14px 8px 32px; font-size: 14px; }
details.unitbox li { margin-bottom: 4px; }
.unit-notes { margin: 2px 14px 10px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.unit-notes .btn { text-decoration: none; }
.here { margin: 0; padding: 8px 14px 12px; font-size: 13.5px; border-top: 1px solid var(--border); }
.here ul { margin: 6px 0 0; padding-left: 18px; }
.here li { margin-bottom: 3px; }
.books { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px 20px; }
.books .bg { font-size: 12.5px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.books ol { margin: 6px 0 0; padding-left: 20px; font-size: 14px; }
.books li { margin-bottom: 6px; }

footer.foot { border-top: 1px solid var(--border); }
footer.foot .inner { max-width: 960px; margin: 0 auto; padding: 16px; }
a.tq { white-space: nowrap; font-size: 12px; text-decoration: none; padding: 1px 7px; margin-left: 4px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--muted); }
a.tq:hover { color: var(--accent); border-color: var(--accent); }

/* pages inside the hub: breadcrumb and page title */
.crumb { font-size: 13.5px; color: var(--muted); margin: 0 0 10px; }
.crumb a { text-decoration: none; }
.page-head { margin: 0 0 14px; }
.page-head h2 { margin: 0 0 4px; font-size: 24px; }
.page-head p { margin: 0; }

/* the autograder on the hub's home page */
.ag-feature { display: flex; flex-wrap: wrap; gap: 14px 22px; align-items: center; margin: 0 0 22px; padding: 18px 20px;
  border: 1px solid var(--accent); border-radius: var(--radius); background: color-mix(in srgb, var(--accent) 8%, var(--surface)); }
.ag-feature .ag-icon { font-size: 34px; line-height: 1; }
.ag-feature .ag-text { flex: 1; min-width: 220px; }
.ag-feature h3 { margin: 0 0 4px; font-size: 18px; }
.ag-feature p { margin: 0; color: var(--muted); font-size: 14px; }
.ag-feature .ag-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.ag-feature .btn { text-decoration: none; }