:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-2: #eef2f7;
  --text: #1c2733;
  --muted: #5b6b7c;
  --border: #d3dbe4;
  --accent: #245b8f;
  --accent-text: #ffffff;
  --grid: #dde4ec;
  --axis: #55677a;
  --warn-bg: #fff4d6;
  --warn-text: #6a4a00;
  --err-bg: #fde4e4;
  --err-text: #8a1c1c;
  --ok: #1f7a3d;
  --c1: #1f6fb4; --c2: #d9622b; --c3: #2f9a62; --c4: #8e5bb5;
  --c5: #b58a1f; --c6: #1e9aa8; --c7: #c2477a; --c8: #6f7d8c;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11171d; --surface: #1a222b; --surface-2: #222c37; --text: #e4ebf2; --muted: #98a8b8;
    --border: #324151; --accent: #5aa6e6; --accent-text: #0c1219; --grid: #2b3744; --axis: #a3b3c3;
    --warn-bg: #3b3115; --warn-text: #f0d98c; --err-bg: #43201f; --err-text: #f4b3b0; --ok: #62c283;
    --c1: #6db3f2; --c2: #f09a62; --c3: #6fd09a; --c4: #c39be6; --c5: #e0bb5d; --c6: #62cfdc; --c7: #ee86b2; --c8: #a2b0be;
  }
}
:root[data-theme="dark"] {
  --bg: #11171d; --surface: #1a222b; --surface-2: #222c37; --text: #e4ebf2; --muted: #98a8b8;
  --border: #324151; --accent: #5aa6e6; --accent-text: #0c1219; --grid: #2b3744; --axis: #a3b3c3;
  --warn-bg: #3b3115; --warn-text: #f0d98c; --err-bg: #43201f; --err-text: #f4b3b0; --ok: #62c283;
  --c1: #6db3f2; --c2: #f09a62; --c3: #6fd09a; --c4: #c39be6; --c5: #e0bb5d; --c6: #62cfdc; --c7: #ee86b2; --c8: #a2b0be;
}

* { box-sizing: border-box; }
html { font-size: 15px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; line-height: 1.4;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; }

.topbar {
  display: flex; align-items: baseline; gap: .75rem; padding: .7rem 16px;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.topbar .logo { width: 28px; height: 28px; align-self: center; }
.topbar h1 { margin: 0; font-size: 1.15rem; }
.topbar .sub { color: var(--muted); font-size: .9rem; }
.topbar .docs-link { color: var(--muted); font-size: .9rem; text-decoration: none; }
.topbar .docs-link:hover { text-decoration: underline; }
.spacer { flex: 1; }
.badge {
  font-size: .78rem; padding: .15rem .55rem; border-radius: 999px;
  background: var(--surface-2); color: var(--muted); border: 1px solid var(--border);
}
.badge.ok { color: var(--ok); }

.layout {
  display: grid; grid-template-columns: 340px minmax(0, 1fr) 280px;
  grid-template-areas: "left main right"; gap: 16px;
  padding: 16px; max-width: 1780px; margin: 0 auto; align-items: start;
}
.controls-left { grid-area: left; }
.results { grid-area: main; }
.controls-right { grid-area: right; }
@media (max-width: 1200px) {
  .layout {
    grid-template-columns: 340px minmax(0, 1fr); grid-template-rows: auto 1fr;
    grid-template-areas: "left main" "right main";
  }
}
@media (max-width: 900px) {
  .layout {
    grid-template-columns: minmax(0, 1fr); grid-template-rows: none;
    grid-template-areas: "left" "right" "main";
  }
}

.controls, .results {
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 14px;
}
.controls section + section { margin-top: 1.1rem; padding-top: 1rem; border-top: 1px solid var(--border); }
h2 { font-size: .95rem; margin: 0 0 .6rem; }

label { display: block; font-size: .85rem; color: var(--muted); margin-top: .5rem; }
label.check { display: flex; align-items: center; gap: .5rem; color: var(--text); margin-top: .4rem; }
label.check:has(input:disabled) { color: var(--muted); opacity: .6; cursor: not-allowed; }
input, select, button {
  font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border);
  border-radius: 6px; padding: .35rem .5rem;
}
label > input:not([type=checkbox]):not([type=radio]), label > select { display: block; width: 100%; margin-top: .2rem; }
select[size] { padding: .15rem; }
.field { margin-top: .5rem; }
.field-label { display: block; font-size: .85rem; color: var(--muted); }
.sidlist {
  margin-top: .2rem; min-height: 2.2rem; max-height: 32rem; overflow-y: auto;
  border: 1px solid var(--border); border-radius: 6px; background: var(--surface);
}
.sid-row { display: flex; align-items: center; gap: .4rem; padding: 0 .4rem; border-left: 3px solid transparent; cursor: pointer; }
.sid-row:hover:not(.current) { background: var(--surface-2); }
.sid-row.current { background: var(--surface-2); border-left-color: var(--accent); }
.sid-row input { margin: 0; padding: 0; }
.sid-swatch { flex: none; width: 14px; height: 3px; border-radius: 2px; background: transparent; }
button.sid-name {
  flex: 1; min-width: 0; text-align: left; border: 0; background: transparent; padding: .25rem 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
button.sid-name:hover:not(:disabled) { background: transparent; text-decoration: underline; }
.sid-row.current button.sid-name { font-weight: 600; }
.sid-row.group { font-weight: 600; }
.sid-row.group:not(:first-child) { border-top: 1px solid var(--border); }
.sid-row.epoch { padding-left: 1.2rem; gap: .35rem; font-size: .82rem; font-variant-numeric: tabular-nums; }
.sid-row.epoch .sid-swatch { width: 12px; }
.sid-chevron { flex: none; width: .9em; color: var(--muted); text-align: center; }
.sid-count { flex: none; font-size: .75rem; font-weight: 400; color: var(--muted); font-variant-numeric: tabular-nums; }
button { cursor: pointer; }
button:hover:not(:disabled) { background: var(--surface-2); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
button.primary:hover { filter: brightness(1.1); background: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 .6rem; }
.grid3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0 .5rem; }
.span2 { grid-column: span 2; }
.row { display: flex; gap: .5rem; margin-top: .5rem; }
.seg { display: flex; gap: 1rem; margin-top: .5rem; }
.seg label { margin: 0; color: var(--text); display: flex; align-items: center; gap: .3rem; }

.drop {
  border: 2px dashed var(--border); border-radius: 8px; padding: .45rem .6rem; text-align: center;
  display: flex; flex-direction: row; flex-wrap: wrap; justify-content: center; align-items: center;
  gap: .5rem; color: var(--muted); font-size: .85rem;
}
.inline { display: flex; gap: .5rem; margin-top: .2rem; }
.inline > input { flex: 1; min-width: 0; }
#clearBtn { margin-top: .5rem; }
.drop.over { border-color: var(--accent); background: var(--surface-2); }
details { margin-top: .5rem; }
summary { cursor: pointer; color: var(--accent); }
details > button { margin-top: .6rem; }
.hint, .msg { font-size: .8rem; color: var(--muted); margin: .4rem 0 0; }
.msg.error { color: var(--err-text); }
.msg.ok { color: var(--ok); }

.toolbar { display: flex; align-items: flex-start; gap: .6rem; margin-bottom: .5rem; }
.title-line { display: flex; align-items: center; flex-wrap: wrap; }
.title-line .sid-swatch { margin-right: .5rem; }
.title-range { display: inline-block; margin-left: .75rem; padding-left: .75rem; border-left: 1px solid var(--border); font-weight: 400; font-size: .85rem; color: var(--muted); }
.toolbar h2 { margin: 0; font-size: 1rem; overflow-wrap: anywhere; }
.menu { position: relative; }
.menu-list {
  position: absolute; right: 0; top: calc(100% + 4px); z-index: 5; min-width: 15rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: .25rem;
  box-shadow: 0 8px 24px rgb(0 0 0 / .18); display: flex; flex-direction: column;
}
.menu-list[hidden] { display: none; }
.menu-list button { text-align: left; border: 0; background: transparent; }

.plotwrap { position: relative; }
.placeholder {
  min-height: 320px; display: grid; place-items: center; text-align: center; padding: 1rem;
  color: var(--muted); border: 1px dashed var(--border); border-radius: 8px;
}
#plot { width: 100%; height: auto; display: block; touch-action: pan-y; }
#plot[hidden], .placeholder[hidden], .tip[hidden] { display: none; }
.tip {
  position: absolute; pointer-events: none; background: var(--surface); border: 1px solid var(--border);
  border-radius: 6px; padding: .3rem .5rem; font-size: .78rem; box-shadow: 0 4px 14px rgb(0 0 0 / .2);
  font-variant-numeric: tabular-nums; white-space: nowrap;
}
.tip .sw { display: inline-block; width: 12px; height: 3px; margin-right: .35rem; vertical-align: middle; border-radius: 2px; }
.hint-tip {
  position: fixed; z-index: 50; max-width: min(32rem, calc(100vw - 1rem)); pointer-events: none;
  background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: 6px;
  padding: .3rem .5rem; font-size: .78rem; box-shadow: 0 4px 14px rgb(0 0 0 / .2); overflow-wrap: anywhere;
  white-space: pre-line;
}
.hint-tip[hidden] { display: none; }

.summary { font-size: .85rem; color: var(--muted); margin: .4rem 0; }
.summary b { color: var(--text); font-weight: 600; }
#alerts .alert { padding: .5rem .75rem; border-radius: 6px; margin-bottom: .5rem; font-size: .88rem; }
#alerts .warn { background: var(--warn-bg); color: var(--warn-text); }
#alerts .error { background: var(--err-bg); color: var(--err-text); }

.tablewrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .82rem; font-variant-numeric: tabular-nums; }
caption { text-align: left; font-weight: 600; font-size: .9rem; padding: .3rem 0; }
.stage-for { display: inline-flex; align-items: center; gap: .35rem; margin-left: .5rem; font-weight: 400; color: var(--muted); }
.stage-for[hidden] { display: none; }
.stage-for b { font-weight: 600; }
th, td { text-align: left; padding: .3rem .5rem; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; }
td.stage-num { font-weight: 600; }
tr.off td { opacity: .45; }
tr.off td:first-child { opacity: 1; }
.theme-btn { padding: .1rem .5rem; line-height: 1.3; border-radius: 999px; }

.foot { text-align: center; color: var(--muted); font-size: .8rem; padding: 1rem 16px 1.5rem; }
.foot a { color: var(--accent); }

#helpDialog {
  width: min(46rem, calc(100vw - 32px)); max-height: 85vh; padding: 0; overflow: hidden;
  color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 12px 40px rgb(0 0 0 / .35);
}
#helpDialog[open] { display: flex; flex-direction: column; }
#helpDialog::backdrop { background: rgb(0 0 0 / .5); }
.help-head { display: flex; align-items: center; justify-content: space-between; padding: .6rem 1rem; border-bottom: 1px solid var(--border); }
.help-head h2 { margin: 0; font-size: 1.05rem; }
.help-body { overflow-y: auto; padding: .25rem 1rem 1rem; font-size: .9rem; }
.help-body h3 { font-size: .95rem; margin: 1.1rem 0 .4rem; }
.help-body p { margin: .4rem 0; }
.help-body dt { font-weight: 600; margin-top: .6rem; }
.help-body dd { margin: .15rem 0 0 1rem; color: var(--muted); }
.help-body a { color: var(--accent); }

/* SVG plot */
.axis-line { stroke: var(--axis); stroke-width: 1; fill: none; }
.grid-line { stroke: var(--grid); stroke-width: 1; }
.grid-minor { stroke: var(--grid); stroke-width: .5; opacity: .6; }
.tick-label { fill: var(--axis); font-size: 11px; font-family: system-ui, sans-serif; }
.axis-title { fill: var(--text); font-size: 12px; font-family: system-ui, sans-serif; }
.curve { fill: none; stroke-width: 2.8; stroke-linejoin: round; }
.curve.stage { stroke-width: 1.2; opacity: .9; }
.ref-line { stroke: var(--axis); stroke-width: 1; stroke-dasharray: 5 4; opacity: .8; }
.ref-label { fill: var(--axis); font-size: 11px; font-family: system-ui, sans-serif; }
.points { fill: none; stroke-width: 1.5; }
.points.stage { stroke-width: 1; }
.legend-box { fill: var(--surface); stroke: var(--border); opacity: .92; }
.legend-text { fill: var(--text); font-size: 11px; font-family: system-ui, sans-serif; }
.cursor { stroke: var(--axis); stroke-width: 1; stroke-dasharray: 3 3; }
.plot-bg { fill: var(--surface); }
.export-title { fill: var(--text); font-size: 13px; font-weight: 600; font-family: system-ui, sans-serif; }
.export-title-sub { fill: var(--muted); font-size: 11px; font-weight: 400; }

button.mini { padding: 0 .3rem; font-size: .75rem; width: 3.4em; text-align: center; } /* fixed width: label switches between All and None */
th.usecol, td:first-child { width: 1%; padding-left: .3rem; padding-right: .3rem; text-align: center; }