:root {
  --bg: #f5f6f8; --panel: #fff; --ink: #1d2433; --muted: #6b7385; --line: #e3e6ec;
  --accent: #1f5eff; --accent-ink: #fff; --good: #138a4b; --bad: #c62f2f; --warn: #b26a00;
  --good-bg: #e6f5ec; --bad-bg: #fdecec; --warn-bg: #fff4e0; --info-bg: #e9f0ff;
  --side: #121a2b; --side-ink: #c9d1e3; --radius: 8px;
  font-family: -apple-system, "Segoe UI", Roboto, Inter, Arial, sans-serif; font-size: 14px; color: var(--ink);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 22px; margin: 0 0 16px; }
h3 { font-size: 15px; margin: 18px 0 10px; }
.card h3:first-child, section > h3:first-child { margin-top: 0; }

.shell { display: grid; grid-template-columns: 230px 1fr; min-height: 100vh; }
.side { background: var(--side); color: var(--side-ink); display: flex; flex-direction: column; padding: 18px 0; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.brand { color: #fff; font-weight: 700; padding: 0 20px 16px; font-size: 16px; }
.side nav a { display: flex; justify-content: space-between; align-items: center; color: var(--side-ink); padding: 8px 20px; }
.side nav a:hover { background: rgba(255,255,255,.06); text-decoration: none; }
.side nav a.active { background: rgba(255,255,255,.12); color: #fff; border-left: 3px solid var(--accent); padding-left: 17px; }
.nav-h { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; opacity: .5; padding: 16px 20px 4px; }
.badge { background: var(--bad); color: #fff; border-radius: 10px; padding: 0 7px; font-size: 12px; }
.me { margin-top: auto; padding: 16px 20px 0; border-top: 1px solid rgba(255,255,255,.1); font-size: 13px; }
.me small { opacity: .7; display: block; margin: 2px 0 6px; }
.me a { color: #9db7ff; }
.main { padding: 24px 28px 60px; min-width: 0; }

.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-bottom: 16px; }
.narrow { max-width: 520px; }
.grid2 { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(300px, 1fr); gap: 16px; align-items: start; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.row3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.end { display: flex; align-items: flex-end; padding-bottom: 12px; }

label { display: block; margin-bottom: 12px; font-size: 13px; color: var(--muted); }
input, select, textarea { display: block; width: 100%; margin-top: 4px; padding: 8px 10px; border: 1px solid #cfd4de; border-radius: 6px; font: inherit; color: var(--ink); background: #fff; }
input:focus, select:focus, textarea:focus { outline: 2px solid rgba(31,94,255,.25); border-color: var(--accent); }
input:user-invalid, select:user-invalid { border-color: var(--bad); }
input[type=file] { padding: 6px; background: #fafbfc; }
label.chk { display: flex; align-items: center; gap: 8px; color: var(--ink); }
label.chk input { width: auto; margin: 0; }
label.chk.big { font-size: 15px; font-weight: 600; padding-top: 24px; }
.checks { display: flex; flex-wrap: wrap; gap: 4px 16px; margin-bottom: 12px; }
.err { color: var(--bad); font-size: 12px; margin-top: 4px; }

.btn { display: inline-block; padding: 8px 14px; border-radius: 6px; border: 1px solid #cfd4de; background: #fff; color: var(--ink); font: inherit; cursor: pointer; text-decoration: none; }
.btn:hover { background: #f0f2f6; text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.danger { background: var(--bad); border-color: var(--bad); color: #fff; }
.btn.danger-outline { color: var(--bad); border-color: #e7b3b3; }
.btn:disabled { opacity: .6; cursor: wait; }
button.link { background: none; border: 0; padding: 0; color: var(--accent); cursor: pointer; font: inherit; }
button.link.danger { color: var(--bad); }
.actions { display: flex; gap: 8px; }

.filters { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 14px; }
.filters input, .filters select { width: auto; margin: 0; min-width: 140px; }
.filters label { display: flex; align-items: center; gap: 6px; margin: 0; }
.filters form.inline { display: inline; }
.chip { padding: 5px 12px; border-radius: 16px; border: 1px solid var(--line); background: #fff; color: var(--ink); }
.chip.on { background: var(--ink); color: #fff; border-color: var(--ink); }
.chip:hover { text-decoration: none; }
.pager { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 12px; }

.tbl { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.tbl th { text-align: left; font-weight: 600; font-size: 12px; color: var(--muted); background: #fafbfc; padding: 9px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.tbl td { padding: 9px 10px; border-bottom: 1px solid #eef0f4; vertical-align: top; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl.compact td, .tbl.compact th { padding: 6px 10px; }
.tbl tr.off td { opacity: .5; }
.tbl tr.attn td { background: #fffaf0; }
.tbl tr.total td { font-weight: 700; background: #fafbfc; }
.tbl tr.hdr td { font-weight: 700; background: var(--info-bg); }
.tbl.diff .old { color: var(--muted); text-decoration: line-through; }
.tbl.diff .new { font-weight: 600; background: var(--good-bg); }
.r { text-align: right; white-space: nowrap; }
.mono { font-family: ui-monospace, Menlo, monospace; font-size: 13px; }
.scroll { overflow-x: auto; margin-bottom: 16px; }

.muted { color: var(--muted); }
.small { font-size: 12px; }
.good { color: var(--good); }
.bad { color: var(--bad); }
.warn { color: var(--warn); }

.tag { display: inline-block; padding: 1px 8px; border-radius: 10px; font-size: 12px; background: #eef0f4; color: var(--ink); white-space: nowrap; }
.tag.ok { background: var(--good-bg); color: var(--good); }
.tag.bad { background: var(--bad-bg); color: var(--bad); }
.tag.warn { background: var(--warn-bg); color: var(--warn); }
.tag.off { background: #eef0f4; color: var(--muted); }

.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 12px; background: var(--info-bg); }
.flash-ok { background: var(--good-bg); color: #0d5c33; }
.flash-error { background: var(--bad-bg); color: #8a1f1f; }
.flash-warn { background: var(--warn-bg); color: #7a4800; }

.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; margin-bottom: 18px; }
.tile { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; color: var(--ink); display: block; }
.tile:hover { text-decoration: none; border-color: #c4cad6; }
.tile b { display: block; font-size: 22px; margin-bottom: 4px; }
.tile span { color: var(--muted); font-size: 12px; }
.tile.bad b { color: var(--bad); } .tile.good b { color: var(--good); } .tile.warn b { color: var(--warn); }

.dl { display: grid; grid-template-columns: 170px 1fr; gap: 6px 12px; margin: 0 0 8px; }
.dl dt { color: var(--muted); }
.dl dd { margin: 0; }
.files { list-style: none; padding: 0; margin: 0; }
.files li { padding: 6px 0; border-bottom: 1px solid #eef0f4; }
.files li.off { opacity: .55; }
.head-actions { display: flex; gap: 8px; align-items: center; margin: -8px 0 14px; }
.inline-form { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.inline-form input { width: auto; margin: 0; }
.total-line { padding: 10px 12px; background: #fafbfc; border-radius: 6px; margin-bottom: 12px; min-height: 20px; }
.total-line:empty { display: none; }
.decision { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.approve-bar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; position: sticky; bottom: 0; margin-top: 16px; box-shadow: 0 -4px 12px rgba(0,0,0,.05); }
.approve-bar > div { flex: 1; min-width: 260px; }
.bar { display: inline-block; width: 60px; height: 6px; background: #eef0f4; border-radius: 3px; margin-right: 6px; vertical-align: middle; overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--accent); }

.student-cell .pick { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 6px; position: relative; }
.student-cell .pick select, .student-cell .pick input { width: auto; min-width: 160px; margin: 0; padding: 4px 6px; font-size: 12px; }
.suggest { position: absolute; top: 100%; left: 0; z-index: 10; background: #fff; border: 1px solid var(--line); border-radius: 6px; box-shadow: 0 6px 18px rgba(0,0,0,.12); min-width: 320px; max-height: 280px; overflow-y: auto; }
.suggest:empty { display: none; }
.suggest button { display: block; width: 100%; text-align: left; border: 0; background: none; padding: 7px 10px; cursor: pointer; font: inherit; }
.suggest button:hover { background: var(--info-bg); }
.suggest small { color: var(--muted); }

.login { min-height: 100vh; display: grid; place-items: center; }
.login .card { width: 340px; }
.login h1 { text-align: center; }

@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .side { position: static; height: auto; }
  .grid2, .row2, .row3 { grid-template-columns: 1fr; }
  .main { padding: 16px; }
  .dl { grid-template-columns: 1fr; }
}