:root {
  --blue: #1558c0;
  --blue-dark: #0d3f8f;
  --blue-soft: #e8f0fc;
  --line: #d5e0f2;
  --text: #16243a;
  --muted: #5b6b82;
  --red: #b3261e;
  --bg: #f6f9fe;
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; color: var(--text); background: var(--bg); }
a { color: var(--blue); }
.wrap { max-width: 920px; margin: 0 auto; padding: 0 16px; }
main.wrap { padding-top: 24px; padding-bottom: 56px; }

.top { background: #fff; border-bottom: 3px solid var(--blue); }
.top-in { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-top: 12px; padding-bottom: 12px; }
.brand { font-weight: 800; font-size: 22px; letter-spacing: .04em; color: var(--blue); text-decoration: none; }
.top nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.top nav a, .linkbtn { padding: 6px 12px; border-radius: 6px; color: var(--text); text-decoration: none; font: inherit; background: none; border: 0; cursor: pointer; }
.top nav a:hover, .linkbtn:hover { background: var(--blue-soft); }
.top nav a.on { background: var(--blue); color: #fff; }
.inline { display: inline; }

h1 { font-size: 28px; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 0 0 12px; color: var(--blue-dark); }
.lead, .crumb { color: var(--muted); margin: 0 0 20px; }
.crumb { margin-bottom: 8px; }
.crumb a { text-decoration: none; }
.empty { color: var(--muted); background: #fff; border: 1px dashed var(--line); border-radius: 10px; padding: 20px; text-align: center; }
.empty.small { padding: 10px; font-size: 14px; }

/* vyber rocnika */
.grades { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 16px; }
.grade { display: flex; flex-direction: column; gap: 2px; padding: 20px; background: #fff; border: 1px solid var(--line); border-radius: 12px; text-decoration: none; color: var(--text); transition: border-color .15s, box-shadow .15s; }
.grade:hover, .grade:focus-visible { border-color: var(--blue); box-shadow: 0 4px 14px rgba(21, 88, 192, .15); }
.grade-n { font-size: 44px; font-weight: 800; line-height: 1; color: var(--blue); }
.grade-t { font-weight: 600; font-size: 18px; }
.grade-c { color: var(--muted); font-size: 14px; }

/* temy a materialy */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 24px; }
.chips a { padding: 5px 12px; border-radius: 999px; background: var(--blue-soft); text-decoration: none; font-size: 14px; }
.chips a:hover { background: var(--blue); color: #fff; }
.topic { margin-top: 28px; scroll-margin-top: 16px; }
.items { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.item { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.item-main { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; text-decoration: none; color: var(--text); }
a.item-main:hover .item-title { color: var(--blue); text-decoration: underline; }
.item-title { font-weight: 600; flex: 1 1 200px; min-width: 0; overflow-wrap: anywhere; }
.meta { color: var(--muted); font-size: 14px; white-space: nowrap; }
.badge { flex: none; min-width: 54px; text-align: center; padding: 3px 6px; border-radius: 6px; background: var(--blue); color: #fff; font-size: 12px; font-weight: 700; letter-spacing: .03em; }
.badge-link { background: #fff; color: var(--blue); box-shadow: inset 0 0 0 1.5px var(--blue); }
.badge-text { background: var(--blue-soft); color: var(--blue-dark); }
.desc { margin: 6px 0 0 66px; color: var(--muted); font-size: 14px; }
.note { margin: 10px 0 0; padding: 12px 14px; background: var(--blue-soft); border-left: 3px solid var(--blue); border-radius: 0 8px 8px 0; overflow-wrap: anywhere; }

/* formulare a sprava */
.card { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin: 16px 0; }
.card.narrow { max-width: 420px; margin: 40px auto; }
.row { display: flex; gap: 8px; align-items: flex-end; flex-wrap: wrap; }
.grow { flex: 1 1 220px; }
label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 12px; }
.hint { font-weight: 400; color: var(--muted); }
input[type=text], input[type=url], input[type=password], textarea, input[type=file] { display: block; width: 100%; margin-top: 4px; padding: 9px 10px; font: inherit; color: var(--text); background: #fff; border: 1px solid #b9c7de; border-radius: 8px; }
input:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid rgba(21, 88, 192, .35); outline-offset: 1px; }
.row label { margin-bottom: 0; }
.btn { padding: 9px 16px; font: inherit; font-weight: 600; color: #fff; background: var(--blue); border: 1px solid var(--blue); border-radius: 8px; cursor: pointer; }
.btn:hover { background: var(--blue-dark); }
.btn.ghost { background: #fff; color: var(--blue); border-color: #b9c7de; }
.btn.ghost:hover { background: var(--blue-soft); }
.btn.danger { background: #fff; color: var(--red); border-color: #e3b5b1; }
.btn.danger:hover { background: #fdecea; }
.btn:disabled { opacity: .4; cursor: default; }
.flash { padding: 10px 14px; border-radius: 8px; margin: 0 0 16px; }
.flash.ok { background: #e6f4ea; color: #14532d; }
.flash.err { background: #fdecea; color: var(--red); }

.tabs { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 12px 0; border-bottom: 1px solid var(--line); padding-bottom: 10px; }
.tabs a { padding: 6px 14px; border-radius: 8px; text-decoration: none; color: var(--text); }
.tabs a.on { background: var(--blue); color: #fff; }
.tabs a:not(.on):hover { background: var(--blue-soft); }
.tabs .tabs-view { margin-left: auto; color: var(--blue); font-size: 14px; }

.topic-head { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 12px; }
.topic-name { font-weight: 700; font-size: 17px; margin-top: 0 !important; }
.admin-items .item { background: var(--bg); }
.hidden-item .item-main { opacity: .55; }
.actions { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.actions .btn, .topic-head .btn { padding: 6px 12px; font-size: 14px; }
details { margin-top: 8px; }
summary { cursor: pointer; color: var(--blue); font-weight: 600; width: fit-content; }
details form { margin-top: 12px; }
details.add { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); }
.types { border: 0; padding: 0; margin: 0 0 12px; display: flex; gap: 16px; flex-wrap: wrap; }
.types legend { font-size: 14px; font-weight: 600; padding: 0; margin-bottom: 4px; }
.types label { font-weight: 400; margin: 0; font-size: 16px; }
[hidden] { display: none !important; }

@media (max-width: 520px) {
  .desc { margin-left: 0; }
  .tabs .tabs-view { margin-left: 0; }
}