[hidden] { display:none !important; }
:root {
  --bg:#fff; --fg:#1a1a1a; --muted:#5f6670; --card:#f4f5f7; --line:#d6d9de; --accent:#1f5fbf;
  --plot-fg:#1a1a1a; --plot-grid:#e3e5e9;
}
@media (prefers-color-scheme: dark) {
  :root { --bg:#16181d; --fg:#e8e8e8; --muted:#9aa3ad; --card:#1f2229; --line:#33373f; --accent:#6aa3ff;
          --plot-fg:#e8e8e8; --plot-grid:#33373f; }
}
* { box-sizing:border-box; }
body { background:var(--bg); color:var(--fg); font:16px/1.5 system-ui,sans-serif; margin:0; }
main { max-width:72rem; margin:0 auto; padding:1.5rem 1rem 4rem; }
h1 { margin:0 0 .25rem; }
h2 { margin:2rem 0 .75rem; }
h2 small { font-weight:400; color:var(--muted); font-size:.7em; margin-left:.5rem; }
.note, .status { color:var(--muted); margin:.25rem 0; }
.message { padding:.75rem 1rem; border-radius:8px; background:var(--card); border:1px solid var(--line); }
.message.warn { border-color:#c98a00; }
.message.error { border-color:#c0392b; }
#drop { border:2px dashed var(--line); border-radius:12px; background:var(--card); padding:2.5rem 1rem;
        text-align:center; cursor:pointer; display:flex; flex-direction:column; gap:.4rem; }
#drop:hover, #drop:focus-visible, #drop.over { border-color:var(--accent); outline:none; }
#drop span { color:var(--muted); font-size:.9rem; }
#chooser { display:block; margin-top:.75rem; }
select { font:inherit; padding:.25rem .5rem; }
table { border-collapse:collapse; width:100%; max-width:46rem; }
td { padding:.3rem .6rem; border-bottom:1px solid var(--line); vertical-align:top; word-break:break-word; }
td:first-child { color:var(--muted); width:12rem; white-space:nowrap; }
details { margin-top:.75rem; } summary { cursor:pointer; color:var(--accent); }
.plots { display:grid; grid-template-columns:repeat(auto-fit,minmax(min(100%,30rem),1fr)); gap:1rem; }
.plot-card { background:var(--card); border:1px solid var(--line); border-radius:10px; padding:.5rem; min-width:0; }
.slider { display:flex; align-items:center; gap:.5rem; padding:0 .5rem; }
.slider input { flex:1; }
code { background:var(--card); padding:0 .25rem; border-radius:4px; }
.plot-card > div[id^="plot-"] { height:22rem; }
.samples-row { margin:.75rem 0 0; display:flex; flex-wrap:wrap; align-items:center; gap:.75rem; }
button { font:inherit; padding:.4rem .9rem; border-radius:8px; border:1px solid var(--accent); color:var(--accent);
         background:transparent; cursor:pointer; }
button:hover, button:focus-visible { background:var(--accent); color:var(--bg); outline:none; }

/* ── tabs ─────────────────────────────────────────────────────────────── */
.tabs { display:flex; gap:.25rem; box-shadow:inset 0 -2px 0 var(--line); margin:1rem 0 1.25rem; overflow-x:auto; overflow-y:hidden; scrollbar-width:thin; }
.tabs [role="tab"] { border:0; border-radius:8px 8px 0 0; padding:.55rem 1.1rem; background:transparent; color:var(--muted);
                     white-space:nowrap; border-bottom:2px solid transparent; }
.tabs [role="tab"] span { display:inline-block; min-width:1.4em; height:1.4em; line-height:1.4em; text-align:center;
                          border-radius:50%; background:var(--line); color:var(--fg); font-size:.8em; margin-right:.3em; }
.tabs [role="tab"][aria-selected="true"] { color:var(--fg); font-weight:600; border-bottom-color:var(--accent); background:var(--card); }
.tabs [role="tab"][aria-selected="true"] span { background:var(--accent); color:var(--bg); }
.tabs [role="tab"]:hover:not(:disabled):not([aria-selected="true"]) { background:var(--card); color:var(--fg); }
.tabs [role="tab"]:disabled { opacity:.45; cursor:not-allowed; }
.tabs [role="tab"]:focus-visible { outline:2px solid var(--accent); outline-offset:-2px; }
.dataset-banner { margin:-.75rem 0 1rem; color:var(--muted); font-size:.92rem; overflow-wrap:anywhere; }
.dataset-banner strong { color:var(--fg); }
.tab-nav { display:flex; justify-content:space-between; gap:1rem; margin:.5rem 0 1rem; }
.tab-nav:last-child { margin:1.5rem 0 0; }
[role="tabpanel"] > h2:first-child { margin-top:.5rem; }

/* ── processing form ──────────────────────────────────────────────────── */
fieldset { border:1px solid var(--line); border-radius:10px; margin:0 0 1rem; padding:.75rem 1rem 1rem; }
legend { padding:0 .4rem; font-weight:600; }
legend small, .opt small { color:var(--muted); font-weight:400; margin-left:.4rem; }
.opt { display:block; padding:.2rem 0; }
.opt.disabled { color:var(--muted); }
.analysis { padding:.4rem 0 .6rem; border-bottom:1px solid var(--line); }
.analysis:last-child { border-bottom:0; padding-bottom:0; }
.fields { display:flex; flex-wrap:wrap; gap:.5rem 1.25rem; padding:.3rem 0 0 1.6rem; align-items:center; }
.fields input[type="number"] { width:7.5rem; font:inherit; padding:.2rem .4rem; }
.fields .hint { flex-basis:100%; color:var(--muted); }
.run-row { display:flex; align-items:center; gap:1rem; }
#run-btn { background:var(--accent); color:var(--bg); font-weight:600; padding:.55rem 1.4rem; }
#run-btn:disabled { opacity:.6; cursor:wait; }

/* ── results ──────────────────────────────────────────────────────────── */
h3 { margin:1.75rem 0 .5rem; } h4 { margin:1.25rem 0 .4rem; }
.plot-card.wide { max-width:60rem; }
.plot-card > div.tall { height:30rem; }
#plot-spectrum, #plot-lcurve { height:22rem; }
.table-wrap { overflow-x:auto; max-width:60rem; }
table.grid { width:auto; min-width:24rem; }
table.grid th { text-align:left; padding:.3rem .8rem; border-bottom:2px solid var(--line); color:var(--muted); font-weight:600; }
table.grid td { width:auto; padding:.3rem .8rem; white-space:nowrap; color:var(--fg); }
table.grid td:first-child { width:auto; }
.message.warn { margin:.5rem 0; }
#ft-fields { padding-bottom:.4rem; }

.equation { font-family:"STIX Two Text","Cambria Math",Cambria,"Times New Roman",serif; font-size:1.1rem;
            background:var(--card); border:1px solid var(--line); border-radius:6px; padding:.4rem .8rem;
            display:inline-block; margin:.4rem 0; flex-basis:100%; }
.equation.small { font-size:.95rem; }
.fields .equation { flex-basis:auto; }
progress { width:12rem; accent-color:var(--accent); }
.table-wrap th a, .note a { color:var(--accent); }
.plots .plot-card > div[id^="plot-sp"] { height:22rem; }
.card-note { margin:.25rem .75rem .5rem; font-size:.85rem; }
.run-bar { display:flex; flex-wrap:wrap; align-items:center; gap:.75rem 1rem; margin:1.25rem 0 0; padding-top:1rem; border-top:1px solid var(--line); }
.run-bar .message { flex-basis:100%; margin:0; }
.tab-nav button:disabled { opacity:.6; cursor:default; }
.plot-card.span-all { grid-column:1 / -1; }
.plots .plot-card > div.viewer { height:34rem; }
.viewer-controls { display:grid; grid-template-columns:repeat(auto-fit,minmax(18rem,1fr)); gap:.5rem 1.5rem; padding:.25rem .75rem .5rem; }
.viewer-controls label { display:flex; align-items:center; gap:.5rem; }
.viewer-controls input { flex:1; min-width:6rem; }
.viewer-controls output { min-width:9rem; font-variant-numeric:tabular-nums; }

/* ── uncertainty ───────────────────────────────────────────────────────── */
.unc-bar { display:flex; flex-wrap:wrap; align-items:center; gap:.5rem 1rem; margin:.5rem 0; }
.hist-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(15rem,1fr)); gap:.5rem; margin:.75rem 0; }
.hist-grid > div { height:11rem; background:var(--card); border:1px solid var(--line); border-radius:8px; }
.plots .plot-card > div.tall { height:30rem; }
img.corner { display:block; max-width:100%; margin:auto; }
dialog { border:1px solid var(--line); border-radius:12px; background:var(--bg); color:var(--fg); max-width:32rem; padding:1.25rem 1.5rem; }
dialog::backdrop { background:rgba(0,0,0,.45); }
dialog menu { display:flex; justify-content:flex-end; gap:.75rem; padding:0; margin:1rem 0 0; }
#unc-run { background:var(--accent); color:var(--bg); }
#plot-boot-ilt { height:22rem; }
button.secondary { background:transparent; }
.prov { margin:.5rem 0 1rem; padding:.5rem .9rem; background:var(--card); border:1px solid var(--line); border-radius:8px; }
.prov summary { cursor:pointer; font-weight:600; }
.prov ul { margin:.5rem 0; padding-left:1.2rem; font-size:.9rem; word-break:break-word; }

/* ── loading indicator ─────────────────────────────────────────────────── */
.busy { display:flex; align-items:center; gap:.6rem; margin:.4rem 0; padding:.45rem .8rem; border-radius:8px; background:var(--card); border:1px solid var(--line); }
.spinner { width:1rem; height:1rem; border:2px solid var(--line); border-top-color:var(--accent); border-radius:50%; animation:spin .8s linear infinite; flex:none; }
@keyframes spin { to { transform:rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation:none; border-top-color:var(--line); border-right-color:var(--accent); } }

/* ── "Show more" notes and collapsible results sections ─────────────────── */
details.more { margin:.3rem 0; flex-basis:100%; }
details.more > summary { cursor:pointer; color:var(--accent); font-size:.85rem; width:max-content; }
details.more .more-body { margin-top:.4rem; padding:.4rem .9rem; background:var(--card); border-left:3px solid var(--line); border-radius:0 6px 6px 0; font-size:.88rem; color:var(--muted); }
details.more .more-body p { margin:.45rem 0; }
details.more .more-body a { color:var(--accent); }
details.more .equation { color:var(--fg); }
details.section { margin:1.1rem 0; border-top:1px solid var(--line); }
details.section > summary { cursor:pointer; list-style:none; display:flex; align-items:center; gap:.5rem; }
details.section > summary::-webkit-details-marker { display:none; }
details.section > summary::before { content:"▸"; color:var(--muted); display:inline-block; transition:transform .15s; }
details.section[open] > summary::before { transform:rotate(90deg); }
details.section > summary h3 { margin:.7rem 0; }
.results-toolbar { display:flex; gap:.5rem; margin:.5rem 0 0; }
[data-for][hidden] { display:none !important; }
.analysis-line { color:var(--fg); }
.t2d-hint { flex-basis:100%; margin:.25rem 0; }
.t2d-maps { grid-template-columns:repeat(auto-fit,minmax(min(100%,22rem),1fr)); }
.t2d-maps .plot-card > div { height:16rem; }
.busy button { margin-left:auto; padding:.2rem .8rem; }

.brand { display:flex; align-items:center; justify-content:space-between; gap:1rem; }
.brand h1 { margin:0; }
.logo { height:4.4rem; width:auto; display:block; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .logo { filter:invert(1); } }      /* the logo is black on transparent */
:root[data-theme="dark"] .logo { filter:invert(1); }
.logo-link { display:inline-flex; color:var(--fg); }
.feedback a { color:var(--accent); }
.lab-link { text-align:right; margin:.5rem 0 0; font-size:.9rem; }
.feedback { max-width:72rem; margin:2rem auto 1.5rem; padding:0 1rem; }
.feedback summary, .export-help summary { cursor:pointer; color:var(--muted, inherit); }
.feedback textarea { width:100%; box-sizing:border-box; margin:.5rem 0; font:inherit; }
.feedback pre, .export-help pre { white-space:pre-wrap; overflow-wrap:anywhere; margin:.25rem 0; }
.export-help { flex-basis:100%; }

.save-card { margin:1rem 0; padding:.75rem 1rem; border:1px solid var(--line); border-radius:8px; background:var(--card); }
.save-card h3 { margin:.2rem 0; }
.save-bar, .save-opts { display:flex; flex-wrap:wrap; align-items:center; gap:.5rem 1rem; margin:.5rem 0; }
.plot-settings summary { cursor:pointer; margin:.5rem 0; }
.ps-grid { display:grid; grid-template-columns:repeat(auto-fill, minmax(15rem, 1fr)); gap:.5rem 1rem; }
.ps-grid input[type=number] { width:5rem; }
.error-text { color:#c0392b; }
td.outlier { background:rgba(213, 94, 0, .18); }
.ps-limits input[type=number] { width:6rem; }

.batch-card { margin:1.5rem 0; padding:.75rem 1rem; border:1px solid var(--line); border-radius:8px; background:var(--card); }
.batch-log { list-style:none; margin:.5rem 0 0; padding:0; max-height:16rem; overflow:auto; font-size:.9rem; }
.batch-log li { padding:.1rem 0; }
.batch-log .bad { color:#c0392b; }

.about { max-width:50rem; margin:0 auto; padding:1.5rem 1rem 4rem; line-height:1.55; }
.about h2 { margin-top:2rem; }
.about-link { margin:0 0 .5rem; font-size:.9rem; }
.about table { max-width:100%; table-layout:auto; }
.about td, .about th { overflow-wrap:anywhere; vertical-align:top; }
.about table.grid td { white-space:normal; }

.about .model { margin:1rem 0; padding:.75rem 1rem; border:1px solid var(--line); border-radius:8px; background:var(--card); }
.about .model h3 { margin:.1rem 0 .4rem; font-size:1.05rem; }
.about .model p { margin:.3rem 0; }
.about .sub { margin:1.5rem 0 .25rem; font-size:1.1rem; }
.about .equation { overflow-wrap:anywhere; }

/* small collapsed "Advanced" next to an analysis, and the Advanced settings block at the end of the Process tab */
details.adv { flex-basis:100%; margin:.15rem 0; }
details.adv > summary { cursor:pointer; color:var(--muted); font-size:.9rem; }
details.adv > .adv-body { display:flex; flex-wrap:wrap; gap:.5rem 1rem; margin:.4rem 0 .2rem 1rem; }
details.advanced-settings { margin:1.25rem 0 0; padding:.6rem 1rem; border:1px solid var(--line); border-radius:8px; background:var(--card); }
details.advanced-settings > summary { cursor:pointer; }
details.advanced-settings > .adv-body { margin-top:.75rem; }