/* UTB Attendance — shared UI tokens (from the requirement-gathering prototype) */
:root{
  --bg:#F2F4F3; --surface:#FFFFFF; --surface-2:#EAEEEC; --ink:#14201D; --ink-2:#33433E;
  --muted:#5C6B67; --line:#DCE3E0; --line-strong:#C3CDC9;
  --accent:#0F6E62; --accent-ink:#0B554B; --accent-soft:#DAEBE6; --on-accent:#fff; --btn-border:#7F8C88;
  --ok:#2F7A45; --ok-soft:#DFEEE3; --warn:#9C5C12; --warn-soft:#F6E8D6; --crit:#A93A31; --crit-soft:#F6DFDC;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0D1412; --surface:#151F1C; --surface-2:#1B2724; --ink:#E7EEEB; --ink-2:#C3CFCB;
    --muted:#8FA09B; --line:#26332F; --line-strong:#3A4A44;
    --accent:#54C4AE; --accent-ink:#7FD8C5; --accent-soft:#123A33; --on-accent:#07201C; --btn-border:#3A4A44;
    --ok:#5FBE7C; --ok-soft:#15301F; --warn:#D89A4A; --warn-soft:#33260F; --crit:#E0736A; --crit-soft:#361B18;
  }
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}
h1,h2,h3{margin:0 0 8px;line-height:1.25}
.mono{font-family:ui-monospace,Consolas,monospace}
.muted{color:var(--muted);font-size:13px}
.topbar{display:flex;gap:14px;align-items:center;padding:12px 18px;background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10;flex-wrap:wrap}
.topbar .mark{font-weight:700}
.topbar .who{margin-left:auto;color:var(--muted);font-size:13px}
nav.tabs{display:flex;gap:4px;flex-wrap:wrap}
nav.tabs button{font:inherit;font-size:13.5px;border:0;background:none;color:var(--ink-2);padding:6px 11px;border-radius:7px;cursor:pointer}
nav.tabs button.on{background:var(--accent-soft);color:var(--accent-ink);font-weight:600}
main{padding:18px;max-width:1100px;margin:0 auto}
.card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:14px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.grow{flex:1}
table{width:100%;border-collapse:collapse;font-size:13.5px}
.tw{overflow-x:auto;border:1px solid var(--line);border-radius:8px}
th{text-align:left;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:8px 10px;border-bottom:1px solid var(--line);background:var(--surface-2);white-space:nowrap}
td{padding:7px 10px;border-bottom:1px solid var(--line);vertical-align:middle}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover td{background:color-mix(in srgb, var(--accent-soft) 30%, transparent)}
th[data-sort]{cursor:pointer;user-select:none}
th[data-sort]:hover{color:var(--ink)}
th .sort-ind{font-size:9px;margin-left:3px}
th[aria-sort="ascending"] .sort-ind,th[aria-sort="descending"] .sort-ind{color:var(--accent-ink)}
.table-tools{display:flex;gap:8px;align-items:center;margin-bottom:8px;flex-wrap:wrap}
.table-tools input[type="search"]{max-width:220px}
.table-tools .count{font-size:12px;color:var(--muted)}
.btn{font:inherit;font-size:13px;font-weight:600;padding:6px 12px;border-radius:7px;cursor:pointer;border:1px solid var(--btn-border,#7F8C88);background:var(--surface);color:var(--ink)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.btn.danger{color:var(--crit);border-color:var(--crit)}
.btn.danger-solid{background:var(--crit);border-color:var(--crit);color:#fff}
.btn.sm{font-size:12px;padding:3px 9px}
/* Disabled controls keep readable text; only the fill/border lose weight. */
.btn:disabled{opacity:1;cursor:default;background:var(--surface-2);color:var(--muted);border-color:var(--line)}
.btn.primary:disabled{background:var(--accent-soft);color:var(--accent-ink);border-color:var(--accent-soft)}
.btn.busy{position:relative;color:transparent !important;pointer-events:none}
.btn.busy::after{content:"";position:absolute;inset:0;margin:auto;width:13px;height:13px;border-radius:50%;border:2px solid var(--muted);border-top-color:transparent;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
input,select,textarea{font:inherit;font-size:13.5px;padding:6px 9px;border:1px solid var(--line-strong);border-radius:7px;background:var(--surface);color:var(--ink)}
label{font-size:12px;font-weight:600;color:var(--muted);display:block;margin-bottom:3px}
.field{margin-bottom:10px}
.pill{display:inline-flex;align-items:center;gap:5px;font-size:11.5px;font-weight:600;padding:2px 8px;border-radius:100px;white-space:nowrap}
.pill.ok{background:var(--ok-soft);color:var(--ok)}
.pill.warn{background:var(--warn-soft);color:var(--warn)}
.pill.crit{background:var(--crit-soft);color:var(--crit)}
.pill.info{background:var(--accent-soft);color:var(--accent-ink)}
.pill.neutral{background:var(--surface-2);color:var(--muted);border:1px solid var(--line)}
.banner{padding:10px 12px;border-radius:8px;font-size:13.5px;border:1px solid var(--line);background:var(--surface-2);margin-bottom:12px}
.banner.ok{background:var(--ok-soft);border-color:var(--ok);color:var(--ok)}
.banner.warn{background:var(--warn-soft);border-color:var(--warn);color:var(--warn)}
.banner.crit{background:var(--crit-soft);border-color:var(--crit);color:var(--crit)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-bottom:12px}
.stat{border:1px solid var(--line);border-radius:8px;padding:8px 12px;background:var(--surface)}
.stat .k{font-size:10.5px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.stat .v{font-size:22px;font-weight:600;font-variant-numeric:tabular-nums}
.login{max-width:340px;margin:80px auto}
.brand-block{text-align:center;margin-bottom:10px}
.brand-logo{display:block;margin:0 auto 6px;width:72px;height:72px;object-fit:contain}
.brand-block h2{margin:0;color:var(--accent)}
dialog{border:1px solid var(--line-strong);border-radius:10px;background:var(--surface);color:var(--ink);max-width:480px;width:90%;padding:0}
dialog::backdrop{background:rgba(0,0,0,.45)}
dialog .dlg-body{padding:18px}
dialog h3{margin-bottom:10px}
dialog .dlg-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}
dialog.confirm .dlg-actions{justify-content:stretch}
dialog.confirm .dlg-actions .btn{flex:1}
.hidden{display:none !important}
.toast-holder{position:fixed;bottom:16px;right:16px;z-index:99;display:flex;flex-direction:column;gap:8px;max-width:340px}
.toast{position:relative}
.toast button{position:absolute;top:2px;right:2px;border:0;background:none;font:inherit;font-size:13px;cursor:pointer;color:inherit;opacity:.7;padding:2px 6px}
a{color:var(--accent-ink)}
.searchbox{display:flex;gap:6px;align-items:center}
details.reveal>summary{cursor:pointer;color:var(--accent-ink);font-size:13px;font-weight:600;list-style:none;padding:4px 0}
details.reveal>summary::-webkit-details-marker{display:none}
details.reveal>summary:hover{text-decoration:underline}
tr.retired td{opacity:.55}
.markrow{font-size:11.5px;padding:3px 8px;min-width:3.4em;text-align:center}
.markrow.current{background:var(--accent-soft);border-color:var(--accent-ink);color:var(--accent-ink)}
/* Small inline help icon: hover (or keyboard focus) shows a real tooltip
   bubble — native title tooltips are not shown by every browser shell. */
.info-dot{display:inline-flex;align-items:center;justify-content:center;width:15px;height:15px;margin-left:5px;border-radius:50%;
  border:1px solid var(--line-strong);color:var(--muted);font-size:10px;font-weight:700;font-style:normal;cursor:help;vertical-align:1px;user-select:none}
.info-dot:hover,.info-dot:focus-visible{background:var(--accent-soft);color:var(--accent-ink);border-color:var(--accent-ink)}

/* Visible tooltip bubbles for any element carrying data-tip (help icons and
   table headers). Anchored above the element, wide enough for a sentence. */
[data-tip]{position:relative}
[data-tip]:hover::after,[data-tip]:focus-visible::after{
  content:attr(data-tip);position:absolute;z-index:80;left:50%;transform:translateX(-50%);
  bottom:calc(100% + 7px);background:#1B2724;color:#E7EEEB;font-size:11.5px;font-weight:400;line-height:1.4;
  padding:8px 10px;border-radius:7px;width:max-content;max-width:280px;white-space:normal;
  text-align:left;letter-spacing:normal;text-transform:none;box-shadow:0 4px 14px rgba(0,0,0,.35);pointer-events:none}
[data-tip]:hover::before,[data-tip]:focus-visible::before{
  content:"";position:absolute;z-index:81;left:50%;transform:translateX(-50%);bottom:calc(100% + 2px);
  border:5px solid transparent;border-top-color:#1B2724}
th[data-tip]{cursor:help}
/* Labeled inline controls in toolbars keep the same small muted look as form labels. */
.row label[for]{margin:0;white-space:nowrap}

/* Student scanner: pinch-to-zoom must reach the app, not scroll the page. */
video#cam{touch-action:none}