/* Sperm head annotation. Plain CSS, system fonts, no external resources. */
:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #eef0f4;
  --text: #1b2330;
  --muted: #5a6577;
  --border: #cfd5df;
  --accent: #0b5cad;
  --accent-text: #ffffff;
  --ok: #17703a;
  --warn: #8a5a00;
  --danger: #b3261e;
  --focus: #0b5cad;
  --definite: #00b3a4;
  --uncertain: #f08a00;
  --box: #ffd400;
  --box-dim: #c8c8c8;
  --layer-a: #00b3a4;
  --layer-b: #e0407a;
  --layer-c: #6a5acd;
  --radius: 8px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12161d; --surface: #1b212b; --surface-2: #252c38; --text: #e8ecf2; --muted: #a0abbc;
    --border: #39424f; --accent: #6fb1ff; --accent-text: #08121f; --ok: #5fd08a; --warn: #f1c05a;
    --danger: #ff8a80; --focus: #8ec5ff;
  }
}
:root[data-theme="dark"] {
  --bg: #12161d; --surface: #1b212b; --surface-2: #252c38; --text: #e8ecf2; --muted: #a0abbc;
  --border: #39424f; --accent: #6fb1ff; --accent-text: #08121f; --ok: #5fd08a; --warn: #f1c05a;
  --danger: #ff8a80; --focus: #8ec5ff;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
h1 { font-size: 1.6rem; margin: 0.4rem 0 1rem; line-height: 1.25; }
h2 { font-size: 1.2rem; margin: 0 0 0.75rem; }
h3, .h3 { font-size: 1.05rem; margin: 0 0 0.6rem; }
a { color: var(--accent); }
p { margin: 0 0 0.75rem; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92em; }
.muted { color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--accent-text); padding: 0.5rem 1rem; z-index: 100; }
.skip-link:focus { left: 0; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.site-header {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1.25rem;
  padding: 0.6rem 16px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
.site-nav { display: flex; gap: 1rem; flex: 1 1 auto; }
.signout { display: flex; align-items: center; gap: 0.5rem; margin: 0; }
.who { color: var(--muted); font-size: 0.9rem; }
.page { max-width: 1280px; margin: 0 auto; padding: 16px; }
.crumbs { color: var(--muted); font-size: 0.9rem; margin: 0; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin: 0 0 16px; }
.card-narrow { max-width: 420px; margin: 2rem auto; }
.stack > * + * { margin-top: 0.9rem; }
.row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.75rem; }
.between { justify-content: space-between; }
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; }
.two-up { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.hint { color: var(--muted); font-size: 0.9rem; }
.callout { background: var(--surface-2); border-radius: var(--radius); padding: 0.6rem 0.8rem; min-height: 2.6rem; }
.big { font-size: 1.8rem; margin: 0; font-weight: 650; }
.unit { font-size: 0.9rem; font-weight: 400; color: var(--muted); }

label { display: block; font-weight: 600; margin-bottom: 0.25rem; }
label.inline { display: inline-flex; align-items: center; gap: 0.4rem; margin: 0; }
.choice { display: flex; gap: 0.5rem; align-items: flex-start; font-weight: 400; margin: 0.3rem 0; min-height: 28px; }
.choice input { margin-top: 0.3rem; }
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
legend { font-weight: 600; padding: 0; margin-bottom: 0.3rem; }
input[type=text], input[type=number], input[type=password], input[type=file], select {
  width: 100%; max-width: 100%; min-height: 44px; padding: 0.45rem 0.6rem; font: inherit; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: 6px;
}
input.narrow { width: 7rem; }
input[type=range] { width: 100%; min-height: 32px; }
input[aria-invalid=true] { border-color: var(--danger); }
.field-error { color: var(--danger); font-size: 0.9rem; margin: 0.25rem 0 0; min-height: 0; }
.field-error:empty { display: none; }
.errorlist { color: var(--danger); list-style: none; padding: 0; margin: 0.25rem 0 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.35rem;
  min-height: 44px; padding: 0.4rem 1rem; font: inherit; font-weight: 600; color: var(--text); text-decoration: none;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 6px; cursor: pointer;
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled, .btn[aria-disabled=true] { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.btn-small { min-height: 36px; padding: 0.2rem 0.7rem; font-size: 0.92rem; }
.btn.is-on { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.btn-danger { color: var(--danger); }
[hidden] { display: none !important; }

.notice { border: 1px solid var(--border); border-left-width: 5px; border-radius: 6px; padding: 0.6rem 0.8rem; margin: 0 0 1rem; background: var(--surface); }
.notice-error { border-color: var(--danger); }
.notice-warn { border-color: var(--warn); }
.notice-ok { border-color: var(--ok); }
.notice ul { margin: 0.3rem 0 0; padding-left: 1.2rem; }
.status { min-height: 1.5rem; margin: 0.5rem 0 0; }

.pill { display: inline-block; padding: 0.1rem 0.6rem; border-radius: 99px; border: 1px solid var(--border); background: var(--surface-2); font-size: 0.85rem; font-weight: 600; }
.pill-ready, .pill-submitted { border-color: var(--ok); color: var(--ok); }
.pill-failed, .pill-rejected { border-color: var(--danger); color: var(--danger); }
.pill-draft, .pill-processing { border-color: var(--warn); color: var(--warn); }

.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.table td.num, .table th.num { text-align: right; font-variant-numeric: tabular-nums; }
.table .actions { white-space: nowrap; text-align: right; }
.list { list-style: none; margin: 0; padding: 0; }
.list > li { padding: 0.6rem 0; border-bottom: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; align-items: center; }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 0.6rem 1rem; margin: 0; }
.facts > div { min-width: 0; }
.facts dt { font-size: 0.82rem; color: var(--muted); }
.facts dd { margin: 0; overflow-wrap: anywhere; }
.facts.compact { grid-template-columns: 1fr; }

/* frame picking, chips, tabs */
.frame-picker { display: grid; grid-template-columns: minmax(0, 340px) minmax(0, 1fr); gap: 16px; }
.frame-preview { width: 100%; height: auto; max-width: 340px; background: #000; border-radius: 6px; display: block; image-rendering: auto; }
.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; list-style: none; margin: 0; padding: 0; }
.chip { display: inline-flex; align-items: center; gap: 0.25rem; border: 1px solid var(--border); border-radius: 99px; padding: 0 0.3rem 0 0.7rem; min-height: 36px; background: var(--surface-2); }
.chip button { min-width: 32px; min-height: 32px; border: 0; background: transparent; color: var(--muted); font-size: 1.1rem; cursor: pointer; border-radius: 50%; }
.tabs { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.6rem; }
.tab { min-height: 40px; padding: 0.2rem 0.9rem; border: 1px solid var(--border); border-radius: 6px 6px 0 0; background: var(--surface-2); color: var(--text); cursor: pointer; font: inherit; }
.tab[aria-selected=true] { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }

/* viewer */
.toolbar { display: flex; flex-wrap: wrap; gap: 0.4rem 0.6rem; align-items: center; margin: 0 0 0.5rem; }
.seg { display: inline-flex; gap: 2px; }
.viewport {
  position: relative; overflow: hidden; width: 100%; height: min(62vh, 560px); min-height: 280px;
  background: #101318; border: 1px solid var(--border); border-radius: var(--radius);
  touch-action: none; user-select: none; -webkit-user-select: none; cursor: crosshair;
}
.viewport-tall { height: min(72vh, 760px); }
.viewport.is-grabbing { cursor: grabbing; }
.viewer-stage { position: absolute; left: 0; top: 0; transform-origin: 0 0; will-change: transform; }
.viewer-frame { display: block; position: absolute; left: 0; top: 0; max-width: none; image-rendering: auto; }
.viewer-stage.is-magnified .viewer-frame { image-rendering: pixelated; }
.viewer-stage:not(.is-ready) .viewer-frame { visibility: hidden; }
.viewer-overlay { position: absolute; left: 0; top: 0; overflow: visible; }
.viewer-msg { position: absolute; left: 0; right: 0; top: 50%; transform: translateY(-50%); text-align: center; color: #fff; padding: 0 1rem; display: none; pointer-events: none; }
.viewer-msg.is-visible { display: block; }
.viewer-msg.is-error { color: #ffb4ab; }
.viewer-msg button { pointer-events: auto; }
.readout { margin: 0.4rem 0 0; font-size: 0.9rem; }

.ov-box { fill: none; stroke: var(--box); pointer-events: none; }
.ov-box.is-dim { stroke: var(--box-dim); }
.ov-box-fill { fill: rgba(255, 212, 0, 0.04); pointer-events: none; }
.ov-label { fill: var(--box); font: 600 12px system-ui, sans-serif; paint-order: stroke; stroke: #000; stroke-width: 3px; stroke-linejoin: round; pointer-events: none; }
.ov-handle { fill: #fff; stroke: #000; stroke-width: 1; }
.ov-hit { fill: transparent; }
.ov-mark-definite { fill: var(--definite); stroke: #fff; stroke-width: 1.5; }
.ov-mark-uncertain { fill: rgba(240, 138, 0, 0.18); stroke: var(--uncertain); stroke-width: 2.5; stroke-dasharray: 4 2; }
.ov-mark.is-selected .ov-mark-definite, .ov-mark.is-selected .ov-mark-uncertain { stroke: #fff; stroke-width: 3; stroke-dasharray: none; }
.ov-mark.is-ghost { opacity: 0.45; }
.ov-mark { cursor: pointer; }

.swatch { display: inline-block; width: 12px; height: 12px; border-radius: 50%; }
.swatch-definite { background: var(--definite); border: 1px solid #fff; }
.swatch-uncertain { border: 2px dashed var(--uncertain); }

/* box rows in setup */
.geo-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 340px); gap: 16px; }
.box-rows { list-style: none; margin: 0.5rem 0 0; padding: 0; display: grid; gap: 0.6rem; }
.box-row { border: 1px solid var(--border); border-radius: 6px; padding: 0.5rem; }
.box-row.is-selected { border-color: var(--box); box-shadow: 0 0 0 2px var(--box); }
.box-row .coords { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.4rem; }
.box-row .coords label { font-size: 0.78rem; font-weight: 500; color: var(--muted); }
.box-row input[type=number] { min-height: 38px; padding: 0.2rem 0.4rem; }
.box-row .head { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; margin-bottom: 0.4rem; }

/* editor */
.editor { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 16px; align-items: start; }
.editor-side .card { margin-bottom: 12px; }
.stepper { display: flex; align-items: center; gap: 0.6rem; margin: 0.2rem 0 0.5rem; flex-wrap: wrap; }
.frame-strip { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.3rem; }
.frame-btn { min-width: 52px; min-height: 40px; padding: 0.1rem 0.5rem; border: 1px solid var(--border); border-radius: 6px; background: var(--surface-2); color: var(--text); font: inherit; cursor: pointer; font-variant-numeric: tabular-nums; }
.frame-btn[aria-current=true] { outline: 3px solid var(--focus); outline-offset: 1px; }
.frame-btn.is-anchor { background: var(--box); color: #000; border-color: var(--box); font-weight: 700; }
.keys summary { cursor: pointer; margin-top: 0.5rem; }
.keylist { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 0.3rem 1rem; margin: 0.5rem 0 0; }
.keylist dt { font-weight: 700; font-family: ui-monospace, monospace; font-size: 0.88rem; }
.keylist dd { margin: 0; color: var(--muted); font-size: 0.9rem; }
.box-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.4rem; }
.box-item { display: grid; grid-template-columns: 1fr auto; gap: 0.1rem 0.5rem; width: 100%; text-align: left; padding: 0.45rem 0.6rem; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); color: var(--text); font: inherit; cursor: pointer; min-height: 44px; }
.box-item[aria-current=true] { border-color: var(--box); box-shadow: 0 0 0 2px var(--box); }
.box-item .sub { grid-column: 1 / -1; font-size: 0.85rem; color: var(--muted); }
.state-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 0.35rem; background: var(--muted); }
.state-saved .state-dot { background: var(--ok); }
.state-unsaved .state-dot, .state-saving .state-dot { background: var(--warn); }
.state-retry .state-dot, .state-stale .state-dot, .state-invalid .state-dot, .state-auth .state-dot { background: var(--danger); }
.save-indicator { font-size: 0.9rem; padding: 0.15rem 0.6rem; border-radius: 99px; border: 1px solid var(--border); }
.save-indicator[data-state=saved], .save-indicator[data-state=locked] { border-color: var(--ok); color: var(--ok); }
.save-indicator[data-state=unsaved], .save-indicator[data-state=saving] { border-color: var(--warn); color: var(--warn); }
.save-indicator[data-state=retry], .save-indicator[data-state=stale], .save-indicator[data-state=invalid], .save-indicator[data-state=auth] { border-color: var(--danger); color: var(--danger); font-weight: 600; }
.est-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.est-table th, .est-table td { text-align: left; padding: 0.3rem 0.4rem; border-bottom: 1px solid var(--border); }
.est-table td.num, .est-table th.num { text-align: right; font-variant-numeric: tabular-nums; }
.est-value { font-size: 1.6rem; font-weight: 650; margin: 0; font-variant-numeric: tabular-nums; }
.reference { border-top: 2px solid var(--border); margin-top: 0.75rem; padding-top: 0.5rem; }
.layer-toggle { display: inline-flex; align-items: center; gap: 0.4rem; font-weight: 500; margin: 0; }
.layer-swatch { display: inline-block; width: 14px; height: 14px; border: 2px solid currentColor; }

progress { width: 100%; height: 14px; }

@media (max-width: 960px) {
  .editor, .geo-layout, .frame-picker { grid-template-columns: minmax(0, 1fr); }
  .viewport-tall { height: min(62vh, 560px); }
}
@media (max-width: 520px) {
  .page { padding: 12px 16px; }
  .box-row .coords { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  h1 { font-size: 1.35rem; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }
#frame-preview-msg { min-height: 3em; }
#geo-readout { display: inline-block; min-width: 9rem; }
.box-row .head .btn { white-space: nowrap; }

/* Collapsed optional settings (advanced optics) */
.advanced { margin-top: 0.9rem; border-top: 1px solid var(--border); padding-top: 0.6rem; }
.advanced > summary { cursor: pointer; font-weight: 600; min-height: 28px; }
.advanced[open] > summary { margin-bottom: 0.5rem; }