:root {
  --bg: #f6f7f9; --panel: #ffffff; --text: #1c2027; --muted: #667085; --line: #dde1e7;
  --accent: #2456d6; --accent-text: #ffffff; --danger: #c0392b;
  --ok: #1e8e5a; --ok-bg: #e3f5ec; --warn: #a15c00; --warn-bg: #fdf0d9; --neutral-bg: #eceff3;
  --chart-line: #3b4a63; --chart-grid: #e6e9ee; --chart-bout: rgba(36, 86, 214, .16);
  --z0: #8fb8de; --z1: #62b58f; --z2: #e0a63a; --z3: #d5473d;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171c; --panel: #1d2128; --text: #e6e9ee; --muted: #98a2b3; --line: #313844;
    --accent: #6f95ff; --accent-text: #0c1220; --danger: #ff7b6e;
    --ok: #55d19a; --ok-bg: #16322a; --warn: #f0b95a; --warn-bg: #3a2c12; --neutral-bg: #29303b;
    --chart-line: #a9b6cc; --chart-grid: #2c333e; --chart-bout: rgba(111, 149, 255, .22);
    --z0: #6f9bc4; --z1: #4aa37c; --z2: #cf9a35; --z3: #e2635a;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.topbar { display: flex; align-items: center; gap: 28px; padding: 0 24px; height: 52px;
  background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.brand { font-weight: 700; font-size: 17px; color: var(--text); text-decoration: none; letter-spacing: -.2px; }
nav { display: flex; gap: 4px; }
nav a { padding: 6px 12px; border-radius: 6px; color: var(--muted); text-decoration: none; }
nav a:hover { background: var(--neutral-bg); }
nav a.active { color: var(--text); background: var(--neutral-bg); font-weight: 600; }
main { max-width: 1280px; margin: 0 auto; padding: 22px 24px 60px; }
h1 { font-size: 22px; margin: 0 0 4px; }
h2 { font-size: 16px; margin: 0 0 10px; }
h3 { font-size: 14px; margin: 0 0 8px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }
.grow { flex: 1; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 16px; margin-bottom: 16px; }
.grid { display: grid; gap: 16px; }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(420px, 1fr)); }
.cards { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(138px, 1fr); gap: 10px; margin-bottom: 16px; overflow-x: auto; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; min-width: 0; }
.card .label { color: var(--muted); font-size: 12px; }
.card .value { font-size: 22px; font-weight: 650; letter-spacing: -.3px; }
.card .sub { color: var(--muted); font-size: 12px; margin-top: 2px; }
label.field { display: flex; flex-direction: column; gap: 3px; font-size: 12px; color: var(--muted); }
input, select, button { font: inherit; color: var(--text); }
input[type=text], input[type=number], select { background: var(--panel); border: 1px solid var(--line);
  border-radius: 6px; padding: 5px 8px; min-width: 0; }
input[type=number] { width: 84px; }
input:focus, select:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
button { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 6px 12px; cursor: pointer; }
button:hover:not(:disabled) { background: var(--neutral-bg); }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
button.primary:hover:not(:disabled) { filter: brightness(1.08); background: var(--accent); }
button.danger { color: var(--danger); }
button.link { border: 0; background: none; padding: 2px 4px; color: var(--accent); }
button:disabled { opacity: .5; cursor: not-allowed; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.seg button { border: 0; border-radius: 0; background: var(--panel); padding: 6px 16px; }
.seg button.on { background: var(--accent); color: var(--accent-text); font-weight: 600; }
.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--line); margin: 14px 0 16px; }
.tabs a { padding: 8px 16px; color: var(--muted); text-decoration: none; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tabs a.active { color: var(--text); border-color: var(--accent); font-weight: 600; }
table { border-collapse: collapse; width: 100%; }
th, td { padding: 6px 8px; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: 12px; }
th:first-child, td:first-child, td.l, th.l { text-align: left; }
tbody tr:hover { background: color-mix(in srgb, var(--neutral-bg) 55%, transparent); }
.scroll { overflow-x: auto; }
th.group { text-align: center; border-bottom: 2px solid var(--line); color: var(--text); background: var(--neutral-bg); }
th.group.validated { border-bottom-color: var(--ok); }
th.group.experimental { border-bottom-color: var(--warn); }
th.group.untested { border-bottom-color: var(--muted); }
td input[type=number], td input[type=text] { width: 76px; }
td select { max-width: 130px; }
.badge { display: inline-block; font-size: 11px; font-weight: 600; padding: 1px 7px; border-radius: 999px; vertical-align: middle; }
.badge.validated { background: var(--ok-bg); color: var(--ok); }
.badge.experimental { background: var(--warn-bg); color: var(--warn); }
.badge.untested { background: var(--neutral-bg); color: var(--muted); }
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-left: 5px; vertical-align: middle; }
.dot.validated { background: var(--ok); } .dot.experimental { background: var(--warn); } .dot.untested { background: var(--muted); }
.chip { font-size: 11px; padding: 1px 6px; border-radius: 4px; background: var(--neutral-bg); color: var(--muted); }
.chip.warn { background: var(--warn-bg); color: var(--warn); }
.zone { display: inline-block; padding: 1px 7px; border-radius: 4px; font-size: 12px; color: #fff; }
.zone.z0 { background: var(--z0); } .zone.z1 { background: var(--z1); } .zone.z2 { background: var(--z2); } .zone.z3 { background: var(--z3); }
.notice { border-left: 3px solid var(--accent); background: var(--neutral-bg); padding: 8px 12px; border-radius: 4px; margin-bottom: 14px; }
.notice.warn { border-color: var(--warn); background: var(--warn-bg); }
.epg-cards { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.epg-card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 16px; min-width: 190px; }
.epg-card.current { border-color: var(--accent); }
.epg-card .v { font-size: 22px; font-weight: 700; }
tr.epg-row td { background: color-mix(in srgb, var(--accent) 12%, transparent); font-weight: 600; }
svg.chart { width: 100%; height: auto; display: block; }
svg.chart text { fill: var(--muted); font-size: 11px; }
svg.chart .grid line { stroke: var(--chart-grid); }
svg.chart .axis { stroke: var(--line); }
svg.chart .hr { fill: none; stroke: var(--chart-line); stroke-width: 1.2; }
svg.chart .bout { fill: var(--chart-bout); stroke: var(--accent); stroke-width: 1; }
svg.chart .bout-label { fill: var(--accent); font-weight: 700; }
svg.chart .lap { stroke: var(--warn); stroke-dasharray: 3 3; }
svg.chart .seg-climb { fill: none; stroke: var(--muted); stroke-dasharray: 2 2; }
svg.chart .pending { stroke: var(--danger); stroke-dasharray: 4 3; }
svg.chart .cursor { stroke: var(--muted); }
svg.chart .hr-trace { fill: none; stroke: #E52E3A; stroke-width: 1.3; opacity: .85; }
svg.chart text.hr-axis { fill: #E52E3A; }
svg.chart .smo2-trace { fill: none; stroke: #7a4fd6; stroke-width: 1.3; opacity: .9; }
svg.chart text.smo2-axis { fill: #7a4fd6; }
svg.chart .smo2 { fill: none; stroke: #7a4fd6; stroke-width: 1.3; opacity: .9; }
.key-red { color: #E52E3A; font-weight: 700; } .key-purple { color: #7a4fd6; font-weight: 700; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--neutral-bg); border-radius: 8px; padding: 10px 14px; }
.stat .k { font-size: 12px; color: var(--muted); } .stat .v { font-size: 22px; font-weight: 650; } .stat .s { font-size: 12px; color: var(--muted); }
svg.chart .breath-trace { fill: none; stroke: #0f8f7d; stroke-width: 1.3; opacity: .9; }
svg.chart text.breath-axis { fill: #0f8f7d; }
.key-teal { color: #0f8f7d; font-weight: 700; }
svg.chart .trend { stroke: var(--accent); stroke-dasharray: 5 4; fill: none; }
svg.chart .series { fill: none; stroke: var(--chart-line); stroke-width: 1.6; }
svg.chart .pt { fill: var(--accent); }
svg.chart .pt.routes { fill: var(--z2); }
svg.chart .missing { stroke: var(--muted); stroke-width: 1.5; fill: none; }
.clickable { cursor: crosshair; }
#toasts { position: fixed; right: 16px; bottom: 16px; display: flex; flex-direction: column; gap: 8px; z-index: 20; }
.toast { background: var(--text); color: var(--bg); padding: 9px 14px; border-radius: 8px; max-width: 420px; box-shadow: 0 4px 16px rgba(0,0,0,.25); }
.toast.error { background: var(--danger); color: #fff; }
details summary { cursor: pointer; color: var(--muted); }
.empty { text-align: center; color: var(--muted); padding: 28px 8px; }
code { background: var(--neutral-bg); padding: 1px 5px; border-radius: 4px; font-size: 12px; }

/* Per-bout table: the Bout # and Grade columns stay in view while scrolling sideways. */
table th.frz, table td.frz { position: sticky; background: var(--panel); z-index: 2; }
table th.frz-group, table th.frz.frz-group { background: var(--neutral-bg); z-index: 3; }
table th.frz0, table td.frz0 { left: 0; box-sizing: border-box; width: 68px; min-width: 68px; max-width: 68px; padding-left: 16px; }
table th.frz1, table td.frz1 { left: 68px; box-sizing: border-box; min-width: 64px; box-shadow: 2px 0 0 var(--line); }
table th.frz-group { left: 0; }
tbody tr:hover td.frz { background: color-mix(in srgb, var(--neutral-bg) 100%, var(--panel)); }
/* the scroll box carries no padding, so the frozen columns sit flush with its left edge and nothing shows through beside them */
.bout-scroll { margin: 0 -16px; padding: 0 16px 0 0; }

/* Sessions tab: rolling load window */
svg.chart.donut { max-width: 170px; margin: 0 auto; }
svg.chart.donut text.donut-big { fill: var(--text); font-size: 20px; font-weight: 650; }
svg.chart .slice { stroke: var(--panel); stroke-width: 1.5; fill: var(--muted); }
svg.chart .slice.z0 { fill: var(--z0); } svg.chart .slice.z1 { fill: var(--z1); } svg.chart .slice.z2 { fill: var(--z2); } svg.chart .slice.z3 { fill: var(--z3); }
svg.chart circle.slice { fill: none; stroke-width: 38; }
svg.chart circle.slice.z0 { stroke: var(--z0); } svg.chart circle.slice.z1 { stroke: var(--z1); } svg.chart circle.slice.z2 { stroke: var(--z2); } svg.chart circle.slice.z3 { stroke: var(--z3); }
.legend { display: flex; flex-wrap: wrap; gap: 6px 14px; justify-content: center; margin-top: 8px; font-size: 12px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: -1px; }
.legend i.z0 { background: var(--z0); } .legend i.z1 { background: var(--z1); } .legend i.z2 { background: var(--z2); } .legend i.z3 { background: var(--z3); }
.load-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(240px, 1.25fr); gap: 10px; align-items: stretch; margin-top: 10px; }
.load-row > .card { display: flex; flex-direction: column; }
.load-row > .card:not(.load-pie) .value { font-size: 30px; margin: 22px 0 6px; }
.load-pie .legend { margin-top: 4px; }
@media (max-width: 900px) { .load-row { grid-template-columns: repeat(2, minmax(0, 1fr)); } .load-pie { grid-column: 1 / -1; } }

/* Accounts, Admin page, read-only banner */
input[type=password] { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px; color: var(--text); font: inherit; }
.userbox { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.userbox .who { color: var(--text); text-decoration: none; font-weight: 600; }
.viewbar { position: sticky; top: 52px; z-index: 4; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 8px 24px; background: var(--warn-bg); color: var(--warn); border-bottom: 1px solid var(--warn); font-weight: 500; }
.auth-card { max-width: 440px; margin: 40px auto 16px; display: flex; flex-direction: column; gap: 12px; }
.auth-card .field input { width: 100%; }
.form-error { color: var(--danger); margin: 0; font-weight: 500; }
.consent { background: var(--neutral-bg); border-radius: 8px; padding: 10px 12px; font-size: 13px; }
.consent p { margin: 0 0 8px; }
tr.off td { opacity: .55; }
td.acts { white-space: normal; min-width: 210px; text-align: right; }
td.acts button { margin: 1px 2px; }
details.panel > summary { cursor: pointer; }
.admin-table th { white-space: normal; vertical-align: bottom; line-height: 1.25; }
.admin-table td, .admin-table th { padding: 6px 6px; }
.admin-table td.acts { min-width: 170px; max-width: 200px; }

/* Grade History: RIF scaling basis */
.basis-box { border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; display: flex; flex-direction: column; gap: 6px; }
.basis-box.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.basis-box:not(.active) { opacity: .8; }
.basis-box h3 { margin: 0; }
.basis-box p { margin: 0; }
.manual-row { display: flex; align-items: flex-end; gap: 14px; flex-wrap: wrap; }
.manual-row select { min-width: 150px; }
.ircra-note { color: var(--muted); font-size: 13px; padding-bottom: 6px; }