:root {
  --bg: #f4f5f7; --card: #fff; --ink: #1d2330; --muted: #6b7280; --line: #e3e6eb;
  --brand: #2d5bd1; --ok: #168c3c; --bad: #c81e1e; --warn: #b7791f; --warnbg: #fff4dc;
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink); background: var(--bg); }
a { color: var(--brand); }
h1 { font-size: 1.5rem; margin: .2rem 0 .6rem; display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }
h2 { font-size: 1.05rem; margin: 1.2rem 0 .5rem; }
.top { display: flex; align-items: center; justify-content: space-between; padding: .6rem 1.2rem; background: #fff; border-bottom: 1px solid var(--line); }
.top .brand { font-weight: 700; text-decoration: none; color: var(--ink); }
.top nav a { margin-left: 1rem; text-decoration: none; }
.top .who { margin-left: 1.5rem; color: var(--muted); }
.wrap { max-width: 1200px; margin: 1.2rem auto; padding: 0 1rem; }
.foot { text-align: center; color: var(--muted); font-size: .8rem; padding: 2rem 1rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1rem 1.2rem; margin-bottom: 1rem; }
.card.narrow { max-width: 620px; margin: 1rem auto; }
.row { display: flex; gap: 1rem; align-items: center; }
.row.between { justify-content: space-between; align-items: flex-start; flex-wrap: wrap; }
.actions { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.inline { display: inline-flex; gap: .5rem; }
.stack label, .card > label { display: block; margin: .7rem 0; }
label input[type=text], label input[type=email], label input[type=password], label input[type=number], label textarea, label input[type=file] {
  display: block; width: 100%; margin-top: .25rem; padding: .5rem .6rem; border: 1px solid #cfd4dc; border-radius: 6px; font: inherit;
}
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 1rem; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0 .8rem; }
.muted { color: var(--muted); } .small { font-size: .85rem; } .err { color: var(--bad); }
.ok { color: var(--ok); font-weight: 600; } .bad { color: var(--bad); font-weight: 600; }
.btn { display: inline-block; padding: .45rem .9rem; border: 1px solid #cfd4dc; border-radius: 7px; background: #fff; color: var(--ink); text-decoration: none; font: inherit; cursor: pointer; }
.btn:hover { background: #f0f2f6; }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; } .btn.primary:hover { background: #244aad; }
.btn.danger { color: var(--bad); border-color: #e8b4b4; }
.btn.small { padding: .25rem .6rem; font-size: .85rem; } .btn.tiny { padding: .1rem .45rem; font-size: .75rem; } .btn.big { font-size: 1.05rem; padding: .6rem 1.3rem; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }
.flash { padding: .6rem .9rem; border-radius: 7px; margin: .6rem 0; border: 1px solid transparent; }
.flash-ok { background: #e7f6ec; border-color: #b9e3c6; } .flash-error { background: #fde8e8; border-color: #f4b8b8; }
.flash-warn { background: var(--warnbg); border-color: #f2d7a2; } .flash-info { background: #e9f0fd; border-color: #c5d6f7; }
.tag { display: inline-block; padding: .05rem .5rem; border-radius: 999px; font-size: .75rem; background: #eceff3; color: #374151; vertical-align: middle; }
.tag.warn { background: var(--warnbg); color: var(--warn); font-weight: 600; }
.st-graded, .st-review { background: #e9f0fd; color: var(--brand); } .st-approved { background: #e7f6ec; color: var(--ok); }
.st-failed, .st-expired { background: #fde8e8; color: var(--bad); } .st-grading, .st-rendering { background: var(--warnbg); color: var(--warn); }
table.list { width: 100%; border-collapse: collapse; }
table.list th { text-align: left; font-size: .8rem; color: var(--muted); font-weight: 600; padding: .4rem .5rem; border-bottom: 1px solid var(--line); }
table.list td { padding: .45rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
table.list td.num { color: var(--muted); width: 2.2rem; }
table.items input { width: 100%; padding: .3rem .45rem; border: 1px solid #cfd4dc; border-radius: 5px; font: inherit; }
table.items td.pts { width: 5.5rem; }
tr.uncertain td { background: var(--warnbg); } tr.uncertain input.answer { border-color: var(--warn); }
.label-edit { border: 1px solid transparent; border-radius: 5px; padding: .2rem .4rem; font: inherit; background: transparent; min-width: 8rem; }
.label-edit:hover, .label-edit:focus { border-color: #cfd4dc; background: #fff; }
.label-edit.h1 { font-size: 1.2rem; font-weight: 600; }
.label-edit.saved { border-color: var(--ok); }
.progress { position: relative; height: 26px; background: #e9ecf1; border-radius: 6px; overflow: hidden; margin: .5rem 0 1rem; }
.progress .bar { height: 100%; width: 0; background: var(--brand); transition: width .3s; }
.progress .label { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-size: .85rem; color: #fff; mix-blend-mode: difference; }
.hidden { display: none; }
/* worksheet edit */
.ws-layout { display: grid; grid-template-columns: 1fr 360px; gap: 1rem; align-items: start; }
.ws-layout .keypreview { position: sticky; top: 1rem; }
.imgwrap { position: relative; display: inline-block; max-width: 100%; line-height: 0; user-select: none; }
.imgwrap img { max-width: 100%; display: block; border: 1px solid var(--line); }
.namebox { position: absolute; background: rgba(0,0,0,.65); border: 2px dashed #fff; outline: 1px solid #000; cursor: move; }
#nb_canvas { cursor: crosshair; }
/* review */
.review-layout { display: grid; grid-template-columns: minmax(380px, 1fr) minmax(420px, 1fr); gap: 1rem; align-items: start; }
.pageimg .imgwrap { width: 100%; }
.pin { position: absolute; transform: translate(10px, -50%); min-width: 20px; height: 20px; border-radius: 10px; font-size: .72rem; line-height: 20px; text-align: center; color: #fff; padding: 0 5px; opacity: .9; }
.pin.ok { background: var(--ok); } .pin.bad { background: var(--bad); }
.pin.hl { outline: 3px solid #ffd54a; }
.scorebox .big { font-size: 1.7rem; font-weight: 700; }
tr.flagged td { background: var(--warnbg); }
.flag { color: var(--warn); }
.verdict { white-space: nowrap; }
.flip { border: 1px solid #cfd4dc; background: #fff; border-radius: 6px; width: 2.1rem; height: 2.1rem; font-size: 1.1rem; cursor: pointer; opacity: .45; }
.flip.on { opacity: 1; } .flip.ok.on { background: #e7f6ec; border-color: var(--ok); color: var(--ok); } .flip.bad.on { background: #fde8e8; border-color: var(--bad); color: var(--bad); }
.crumbs { margin: 0; font-size: .85rem; }
details.card summary { cursor: pointer; font-weight: 600; }
@media (max-width: 900px) { .ws-layout, .review-layout { grid-template-columns: 1fr; } .grid4 { grid-template-columns: 1fr 1fr; } .ws-layout .keypreview { position: static; } }