:root {
  --bg: #1a1a1a; --panel: #242424; --border: #444; --text: #e6e6e6; --muted: #aaa;
  --accent: #FFD700; --blue: #6699FF; --green: #66DD66; --red: #FF6666; --warn: #FFAA44;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 1280px; margin: 0 auto; padding: 16px; }
a { color: var(--blue); }
nav.crumb { font-size: .85rem; margin-bottom: 8px; }
h1 { font-size: 1.5rem; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 22px 0 8px; }
p.sub { color: var(--muted); margin: 0 0 14px; }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 12px; }
.controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; margin: 10px 0; }
.controls label { display: block; font-size: .85rem; color: var(--muted); }
.controls label span.v { float: right; color: var(--text); }
select, input[type=range], input[type=number] { width: 100%; }
select, input[type=number] { background: var(--bg); color: var(--text); border: 1px solid var(--border);
       border-radius: 4px; padding: 5px; font-size: .95rem; }
input:disabled { opacity: .5; }
select:focus-visible, input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.check { display: flex; align-items: center; gap: 8px; margin: 8px 0; }
.check input { width: auto; }
.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: 10px 0; }
.metric .label { color: var(--muted); font-size: .85rem; }
.metric .value { font-size: 1.4rem; font-variant-numeric: tabular-nums; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 10px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 10px; }
@media (max-width: 900px) { .grid2, .grid3 { grid-template-columns: 1fr; } }
.plot { height: 380px; }
.plot.tall { height: 430px; }
.caption { color: var(--muted); font-size: .85rem; margin: 8px 0; }
.alert { border: 1px solid var(--red); background: rgba(255,102,102,.12); border-radius: 6px; padding: 8px 12px; margin: 8px 0; }
.info { border: 1px solid var(--blue); background: rgba(102,153,255,.12); border-radius: 6px; padding: 8px 12px; margin: 8px 0; }
.note { border: 1px solid var(--border); border-radius: 6px; padding: 8px 12px; margin-top: 8px; }
hr { border: 0; border-top: 1px solid var(--border); margin: 24px 0 0; }
[hidden] { display: none !important; }

/* Sidebar + content layout, tabs, buttons, details */
.with-sidebar { display: grid; grid-template-columns: 290px 1fr; gap: 16px; align-items: start; }
@media (max-width: 900px) { .with-sidebar { grid-template-columns: 1fr; } }
.sidebar h2 { margin: 0 0 6px; font-size: 1.05rem; }
.sidebar label { display: block; font-size: .85rem; color: var(--muted); margin-top: 10px; }
.sidebar label span.v { float: right; color: var(--text); }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 12px; }
.tabs button { background: none; border: 0; color: var(--muted); padding: 8px 14px; font: inherit; cursor: pointer;
               border-bottom: 2px solid transparent; }
.tabs button[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
button.btn { background: var(--panel); color: var(--text); border: 1px solid var(--border); border-radius: 4px;
             padding: 5px 10px; font: inherit; cursor: pointer; }
button.btn:hover:not(:disabled) { border-color: var(--accent); }
button.btn:disabled { opacity: .45; cursor: default; }
.btnrow { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
details { border: 1px solid var(--border); border-radius: 6px; padding: 8px 12px; margin: 10px 0; background: var(--panel); }
details summary { cursor: pointer; }
.eq { font-family: Georgia, "Times New Roman", serif; font-size: 1.05rem; margin: 8px 0; padding-left: 12px; }
.warn { border: 1px solid var(--warn); background: rgba(255,170,68,.12); border-radius: 6px; padding: 8px 12px; margin: 8px 0; }
.stack > div { margin-bottom: 12px; }
.radio { display: flex; gap: 14px; flex-wrap: wrap; margin: 8px 0; }
.radio label { display: flex; gap: 6px; align-items: center; color: var(--text); }
.radio input { width: auto; }