/* HES interface styles.
   Light palette on :root, dark redefined under both the media query and the
   explicit [data-theme] attribute so the toggle wins in either direction. */

:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --panel-2: #fbfcfd;
  --ink: #14181d;
  --ink-2: #4a5560;
  --muted: #5b6672;   /* 5.6:1 on panel — was #7b8794 (3.7:1, below WCAG 1.4.3) */
  --line: #dfe3e8;
  --line-2: #eceff2;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --accent-soft: #e6f4f1;
  --warn: #b45309;
  --warn-soft: #fdf3e3;
  --danger: #b91c1c;
  --danger-soft: #fdeaea;
  --ok: #15803d;
  --c1: #0f766e; --c2: #b45309; --c3: #1d4ed8; --c4: #7c3aed;
  --c5: #be123c; --c6: #0891b2;
  --shadow: 0 1px 2px rgba(16,24,32,.06), 0 4px 14px rgba(16,24,32,.05);
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1216; --panel: #161b21; --panel-2: #1b2129;
    --ink: #eef2f6; --ink-2: #b9c4cf; --muted: #8b97a4;
    --line: #2a323b; --line-2: #222932;
    --accent: #2dd4bf; --accent-ink: #06231f; --accent-soft: #133b37;
    --warn: #f59e0b; --warn-soft: #34260f;
    --danger: #f87171; --danger-soft: #3a1a1a; --ok: #4ade80;
    --c1: #2dd4bf; --c2: #f59e0b; --c3: #60a5fa; --c4: #a78bfa;
    --c5: #fb7185; --c6: #22d3ee;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 20px rgba(0,0,0,.3);
  }
}
:root[data-theme="dark"] {
  --bg: #0e1216; --panel: #161b21; --panel-2: #1b2129;
  --ink: #eef2f6; --ink-2: #b9c4cf; --muted: #8b97a4;
  --line: #2a323b; --line-2: #222932;
  --accent: #2dd4bf; --accent-ink: #06231f; --accent-soft: #133b37;
  --warn: #f59e0b; --warn-soft: #34260f;
  --danger: #f87171; --danger-soft: #3a1a1a; --ok: #4ade80;
  --c1: #2dd4bf; --c2: #f59e0b; --c3: #60a5fa; --c4: #a78bfa;
  --c5: #fb7185; --c6: #22d3ee;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 20px rgba(0,0,0,.3);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 14px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
        Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
h1 { font-size: 20px; margin: 0; letter-spacing: -.01em; }
h2 { font-size: 15px; margin: 0 0 4px; letter-spacing: -.005em; }
h3 { font-size: 13px; margin: 18px 0 8px; color: var(--ink-2);
     text-transform: uppercase; letter-spacing: .06em; font-weight: 650; }
p { margin: 0 0 10px; }
.muted { color: var(--muted); }
.lead { font-size: 14px; margin-bottom: 16px; }

/* ---------------------------------------------------------------- boot */
.boot { position: fixed; inset: 0; display: grid; place-items: center;
        background: var(--bg); z-index: 100; }
.boot-inner { text-align: center; max-width: 420px; padding: 24px; }
.spinner { width: 30px; height: 30px; margin: 0 auto 16px;
  border: 2.5px solid var(--line); border-top-color: var(--accent);
  border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.boot { transition: opacity .3s; }
.boot-inner { max-width: 480px; }

/* ------------------------------------------------------- engine banner */
/* Shown inside the application, never in front of it. */
#engine-banner { margin: 0 0 18px; padding: 14px 16px; border-radius: 8px;
  border: 1px solid var(--warn); background: var(--warn-soft); }
#engine-banner-msg { font-weight: 650; margin: 0 0 4px; color: var(--warn); }
#engine-banner-hint { font-size: 13px; margin: 0 0 8px; }
#engine-banner-more { font-size: 12px; }
#engine-banner-more summary { cursor: pointer; color: var(--muted); }
#engine-banner-detail { font-size: 12px; line-height: 1.5; margin: 8px 0 0;
  padding: 10px 12px; border-radius: 6px; background: var(--panel);
  border: 1px solid var(--line); max-height: 240px; overflow: auto;
  white-space: pre-wrap; word-break: break-word; color: var(--muted); }
.banner-actions { display: flex; gap: 8px; margin-top: 10px; }

/* -------------------------------------------------------------- layout */
#app { display: grid; grid-template-columns: 236px 1fr; min-height: 100vh; }
.sidebar { background: var(--panel); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; position: sticky; top: 0;
  height: 100vh; }
.brand { display: flex; gap: 10px; align-items: center;
  padding: 18px 18px 16px; border-bottom: 1px solid var(--line-2); }
.brand-mark { font-size: 20px; }
.brand-name { font-weight: 700; letter-spacing: -.01em; }
.brand-sub { font-size: 12px; color: var(--muted); }
/* min-height:0 is what actually lets the nav shrink: a flex item defaults to
   min-height:auto and refuses to go below its content, which pushes the
   footer off the bottom of a short window instead of scrolling the list. */
#nav { padding: 10px 10px; flex: 1 1 auto; min-height: 0; overflow-y: auto; }
.nav-item { display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 8px 10px; border: 0; background: none; color: var(--ink-2);
  border-radius: 8px; cursor: pointer; font: inherit; text-align: left;
  margin-bottom: 1px; }
.nav-item:hover { background: var(--panel-2); color: var(--ink); }
.nav-item.active { background: var(--accent-soft); color: var(--accent);
  font-weight: 600; }
.nav-item.done .nav-num { background: var(--accent); color: var(--accent-ink);
  border-color: var(--accent); }
.nav-num { width: 22px; height: 22px; border-radius: 50%; flex: none;
  border: 1.5px solid var(--line); display: grid; place-items: center;
  font-size: 12px; font-weight: 700; }
.sidebar-foot { padding: 12px 16px; border-top: 1px solid var(--line-2);
  display: flex; flex-direction: column; gap: 11px; flex: none; }
.foot-row { display: flex; justify-content: space-between; align-items: center; }

/* Who made what. The engineering and the code came from two different
   places, and the page says so rather than leaving a reader to assume one
   person did both. Small, quiet, and always visible - an attribution that
   has to be looked for is not an attribution. */
.credits { display: flex; flex-direction: column; gap: 7px; }
.credits div { display: flex; flex-direction: column; }
.credits span { font-size: 12px; font-weight: 700; letter-spacing: .06em;
  text-transform: uppercase; color: var(--muted); }
.credits b { font-size: 12px; font-weight: 600; color: var(--ink-2);
  letter-spacing: -.005em; }

.main { min-width: 0; display: flex; flex-direction: column; }
.topbar { display: flex; justify-content: space-between; align-items: flex-end;
  gap: 16px; padding: 20px 26px 16px; border-bottom: 1px solid var(--line);
  background: var(--panel); position: sticky; top: 0; z-index: 20; }
.topbar-actions { display: flex; gap: 8px; flex: none; }
#pages { padding: 22px 26px 60px; max-width: 1180px; }
.page { display: block; }

/* An author rule for `display` beats the browser's own rule for the hidden
   attribute, so `.page { display: block }` above would show every section at
   once. Anything marked hidden stays hidden. */
[hidden] { display: none !important; }

/* --------------------------------------------------------------- cards */
.card { background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px; margin-bottom: 16px;
  box-shadow: var(--shadow); }
.card > h2 + .help { margin-top: -2px; }
.help { color: var(--muted); font-size: 12.5px; margin-bottom: 14px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.row-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
@media (max-width: 980px) {
  #app { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .grid-2, .row-3 { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------- forms */
.field { display: block; margin-bottom: 12px; }
.field > span { display: block; font-size: 12px; font-weight: 600;
  color: var(--ink-2); margin-bottom: 5px; }
input[type=text], input[type=number], select, textarea {
  width: 100%; padding: 8px 10px; border: 1px solid var(--line);
  border-radius: 7px; background: var(--panel-2); color: var(--ink);
  font: inherit; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent);
  outline-offset: -1px; border-color: transparent; }
textarea { font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px; resize: vertical; }
input[type=file] { font-size: 12.5px; margin-bottom: 12px; min-height: 30px; padding: 3px 0; max-width: 100%; }
input[type=checkbox] { width: auto; }

.btn { padding: 8px 14px; border: 1px solid var(--line); border-radius: 7px;
  background: var(--panel-2); color: var(--ink); font: inherit;
  font-weight: 600; cursor: pointer; }
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); color: var(--accent-ink);
  border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: none; }
.btn.wide { width: 100%; }
.btn.big { padding: 12px; font-size: 15px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }
.linkish { background: none; border: 0; color: var(--ink-2); font: inherit;
  cursor: pointer; text-decoration: underline; font-size: 12.5px;
  min-height: 28px; padding: 4px 6px; border-radius: 6px; }

.seg { display: inline-flex; border: 1px solid var(--line);
  border-radius: 8px; overflow: hidden; margin-bottom: 14px; }
.seg-btn { padding: 7px 13px; border: 0; background: var(--panel-2);
  color: var(--ink-2); font: inherit; font-size: 12.5px; cursor: pointer;
  border-right: 1px solid var(--line); }
.seg-btn:last-child { border-right: 0; }
.seg-btn.active { background: var(--accent); color: var(--accent-ink);
  font-weight: 600; }

.q { display: inline-grid; place-items: center; width: 18px; height: 18px;
  border-radius: 50%; background: var(--line); color: var(--ink);
  font-size: 12px; position: relative; font-style: normal; font-weight: 700; cursor: help;
  vertical-align: 1px; margin-left: 3px; }
.tip { position: fixed; max-width: 290px; background: var(--ink);
  color: var(--bg); padding: 9px 11px; border-radius: 7px; font-size: 12px;
  line-height: 1.45; z-index: 200; pointer-events: none;
  box-shadow: 0 6px 24px rgba(0,0,0,.28); }

/* ------------------------------------------------------------- status */
.status { font-size: 12.5px; margin-top: 10px; }
.status:empty { display: none; }
.status.ok { color: var(--ok); }
.status.err { background: var(--danger-soft); color: var(--danger);
  padding: 10px 12px; border-radius: 7px; }
.status.warn { background: var(--warn-soft); color: var(--warn);
  padding: 10px 12px; border-radius: 7px; }
.badge { font-size: 12px; padding: 3px 8px; border-radius: 20px;
  background: var(--accent-soft); color: var(--accent); font-weight: 650; }
.tag { font-size: 12px; padding: 2px 7px; border-radius: 20px;
  background: var(--line-2); color: var(--muted); font-weight: 600;
  vertical-align: 2px; }

.progress { margin-top: 14px; }
.bar { height: 5px; background: var(--line-2); border-radius: 4px;
  overflow: hidden; margin-bottom: 7px; }
.bar > div { height: 100%; background: var(--accent); width: 0;
  transition: width .25s ease; }
.bar.indeterminate > div { width: 30% !important; animation: slide 1.2s ease-in-out infinite; }
@keyframes slide { from { transform: translateX(-100%); } to { transform: translateX(340%); } }

/* --------------------------------------------------------------- data */
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px,1fr));
  gap: 10px; margin-bottom: 16px; }
.kpi { background: var(--panel-2); border: 1px solid var(--line-2);
  border-radius: 8px; padding: 11px 13px; }
.kpi-val { font-size: 19px; font-weight: 700; letter-spacing: -.02em;
  font-variant-numeric: tabular-nums; }
.kpi-lbl { font-size: 12px; color: var(--muted); margin-top: 1px; }
.kpi-sub { font-size: 12px; color: var(--muted); margin-top: 3px; }

.table-wrap { overflow-x: auto; margin-top: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 12.5px; }
th, td { text-align: right; padding: 7px 10px;
  border-bottom: 1px solid var(--line-2); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .05em;
  color: var(--muted); font-weight: 650;
  border-bottom: 1px solid var(--line); position: sticky; top: 0;
  background: var(--panel); }
td { font-variant-numeric: tabular-nums; }
tbody tr:hover { background: var(--panel-2); }
tbody tr.sel { background: var(--accent-soft); }
tbody tr.clickable { cursor: pointer; }
.pill { padding: 1.5px 7px; border-radius: 20px; font-size: 12px;
  font-weight: 650; }
.pill.ok { background: var(--accent-soft); color: var(--ok); }
.pill.bad { background: var(--danger-soft); color: var(--danger); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.info { background: var(--panel-2); color: var(--muted); }
#design-inputs details { margin-top: 10px; }
#design-inputs summary { cursor: pointer; font-weight: 600; font-size: 12.5px; }
.compliance th, .compliance td { text-align: left; white-space: normal;
  vertical-align: top; }
.compliance td:first-child { white-space: nowrap; width: 70px; }
.compliance td:nth-child(2) { width: 32%; }
.compliance .std { font-size: 12px; color: var(--muted); }

.chart-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 860px) { .chart-row { grid-template-columns: 1fr; } }
.chart { width: 100%; }
.chart-title { font-size: 12px; font-weight: 650; color: var(--ink-2);
  margin-bottom: 2px; }
.legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: 12px;
  color: var(--ink-2); margin-top: 6px; }
.legend span { display: inline-flex; align-items: center; gap: 5px; }
.swatch { width: 10px; height: 10px; border-radius: 2px; }

.highlights { display: grid; grid-template-columns: repeat(auto-fit,minmax(200px,1fr));
  gap: 10px; margin: 16px 0; }
.hl { border: 1px solid var(--line); border-radius: 8px; padding: 12px;
  cursor: pointer; background: var(--panel-2); font: inherit; color: inherit;
  text-align: left; width: 100%; display: flex; flex-direction: column;
  justify-content: flex-start; align-items: stretch; }
.hl[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.hl:hover { border-color: var(--accent); }
.hl-tag { font-size: 12px; text-transform: uppercase; letter-spacing: .06em;
  color: var(--accent); font-weight: 700; margin-bottom: 5px; }
.hl-main { font-size: 13.5px; font-weight: 650; margin-bottom: 4px; }
.hl-sub { font-size: 12px; color: var(--muted); }
.hl-note { font-size: 12px; color: var(--muted); margin-top: 7px;
  padding-top: 7px; border-top: 1px solid var(--line-2); line-height: 1.45; }

/* ----------------------------------------------------------- findings */
/* Plausibility notes from the engine. An interpretation the user can
   contradict is worth more than a result they cannot question, so these
   sit next to the input that produced them rather than in a log. */
.findings { margin-top: 12px; display: grid; gap: 8px; }
.finding { display: grid; grid-template-columns: auto 1fr; gap: 10px;
  align-items: start; padding: 10px 12px; border-radius: 7px;
  font-size: 12.5px; line-height: 1.5; border: 1px solid transparent; }
.finding-tag { font-size: 12px; text-transform: uppercase;
  letter-spacing: .06em; font-weight: 700; white-space: nowrap;
  padding-top: 2px; }
.finding-info { background: var(--panel-2); border-color: var(--line-2);
  color: var(--ink-2); }
.finding-info .finding-tag { color: var(--muted); }
.finding-warning { background: var(--warn-soft); color: var(--warn); }
.finding-warning .finding-tag { color: var(--warn); }
.finding-error { background: var(--danger-soft); color: var(--danger); }
.finding-error .finding-tag { color: var(--danger); }
@media (max-width: 620px) {
  .finding { grid-template-columns: 1fr; gap: 4px; }
}

.provenance { font-size: 12px; color: var(--muted); margin-top: 12px;
  padding-top: 12px; border-top: 1px solid var(--line-2); }
.warn-list { list-style: none; padding: 0; margin: 12px 0 0; }
.warn-list li { background: var(--warn-soft); color: var(--warn);
  padding: 9px 12px; border-radius: 7px; margin-bottom: 6px; font-size: 12.5px; }
.note-list { list-style: none; padding: 0; margin: 10px 0 0;
  font-size: 12px; color: var(--muted); }
.note-list li { padding: 4px 0 4px 14px; position: relative; }
.note-list li::before { content: "—"; position: absolute; left: 0; }

.diagram-box { background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px; overflow-x: auto; }
.diagram-box svg { display: block; min-width: 700px; }

@media print {
  .sidebar, .topbar-actions, .btn { display: none !important; }
  #app { grid-template-columns: 1fr; }
  .card { break-inside: avoid; box-shadow: none; }
}
label.check { display: flex; align-items: center; gap: 8px; font-size: 12.5px;
  color: var(--ink-2); margin-top: 6px; }

/* ================================================== accessibility layer
   WCAG 2.2 AA: visible focus (2.4.7 / 2.4.11), skip link (2.4.1),
   reduced motion (2.3.3), target size (2.5.8), reflow at 320 px (1.4.10). */

.skip-link { position: absolute; left: 12px; top: -60px; z-index: 300;
  background: var(--accent); color: var(--accent-ink); padding: 10px 14px;
  border-radius: 8px; font-weight: 650; text-decoration: none; }
.skip-link:focus { top: 12px; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* One focus ring for everything a keyboard can reach: 2 px, 3:1 against
   both the panel and the accent fill, offset so it never sits on the text. */
:where(button, a, summary, [tabindex], .q, input[type=checkbox], input[type=file], label.btn):focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; }
.btn.primary:focus-visible, .seg-btn.active:focus-visible {
  outline-color: var(--ink); }
.nav-item:focus-visible { outline-offset: -2px; }
.nav-item, .field, label { position: relative; }   /* keeps .sr-only text inside its scroller */
#page-title:focus { outline: none; }
#page-title:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
tbody tr.clickable:focus-visible { outline-offset: -2px; background: var(--accent-soft); }
/* A sticky topbar can hide the focused field when tabbing upwards (2.4.11). */
html { scroll-padding-top: 110px; }

/* fieldset carries the "Include" switch: disabled means out of the tab
   order and announced as unavailable, not just faded. */
fieldset.row-3 { border: 0; margin: 0; padding: 0; min-width: 0; }
fieldset.row-3:disabled { opacity: .45; }

.seg-btn { min-height: 32px; }
.seg-btn:hover:not(.active) { background: var(--line-2); color: var(--ink); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.q::after { content: ""; position: absolute; inset: -4px; }   /* 25 px hit area */
.tip { max-width: 320px; }
.tip[data-place="above"] { transform: translateY(-100%); }

/* --------------------------------------------------------- chart layer */
.chart-wrap { position: relative; }
.chart:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.chart-tip { position: absolute; pointer-events: none; z-index: 5;
  background: var(--panel); color: var(--ink); border: 1px solid var(--line);
  box-shadow: var(--shadow); border-radius: 8px; padding: 8px 10px;
  font-size: 12px; line-height: 1.45; min-width: 140px; white-space: nowrap; }
.chart-tip b { display: block; font-size: 12px; margin-bottom: 3px; }
.chart-tip .row { display: flex; align-items: center; gap: 6px; justify-content: space-between; }
.chart-tip .row span { display: inline-flex; align-items: center; gap: 6px; color: var(--ink-2); }
.chart-tip .row em { font-style: normal; font-variant-numeric: tabular-nums; font-weight: 650; }
.swatch.line { height: 0; border-top: 2.5px solid; border-radius: 0; width: 16px; background: none !important; }
.swatch.line.dash1 { border-top-style: dashed; }
.swatch.line.dash2 { border-top-style: dotted; }
.chart-data { margin-top: 8px; font-size: 12px; }
.chart-data summary { cursor: pointer; color: var(--ink-2); display: inline-block;
  padding: 3px 0; min-height: 24px; }
.chart-data .table-wrap { max-height: 260px; overflow: auto; margin-top: 6px;
  border: 1px solid var(--line-2); border-radius: 6px; }
.chart-data caption { text-align: left; padding: 6px 10px; color: var(--muted); }
.chart-hint { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ------------------------------------------------------ 3-D Pareto view */
.view-toggle { margin: 4px 0 10px; }
#front-3d { position: relative; height: 440px; border: 1px solid var(--line);
  border-radius: 8px; background: var(--panel-2); overflow: hidden; }
#front-3d canvas { display: block; width: 100%; height: 100%; touch-action: none; }
#front-3d .three-msg { position: absolute; inset: 0; display: grid; place-items: center;
  color: var(--muted); font-size: 13px; padding: 20px; text-align: center; }
#front-3d .three-tip { position: absolute; pointer-events: none; }
.three-legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 12px;
  color: var(--ink-2); margin-top: 8px; }
.three-legend i { display: inline-block; width: 18px; height: 3px; vertical-align: middle; margin-right: 5px; }
.colour-ramp { display: inline-block; width: 90px; height: 8px; border-radius: 4px; vertical-align: middle;
  margin: 0 6px; background: linear-gradient(90deg, #440154, #3b528b, #21918c, #5ec962, #fde725); }

/* ------------------------------------------------- narrow screens */
@media (max-width: 980px) {
  /* The sidebar becomes a compact strip so the page, not the menu, is what
     a phone shows first. */
  #app { grid-template-columns: minmax(0, 1fr); }
  .sidebar { min-width: 0; flex-direction: row; flex-wrap: wrap; align-items: center;
    border-right: 0; border-bottom: 1px solid var(--line); position: sticky;
    top: 0; z-index: 30; }
  .brand { border-bottom: 0; padding: 10px 14px; }
  .brand-sub { display: none; }
  #nav { order: 3; flex: 1 0 100%; min-width: 0; max-width: 100%; display: flex; gap: 4px; overflow-x: auto;
    padding: 6px 10px 8px; scrollbar-width: thin; }
  .nav-item { width: auto; flex: none; padding: 7px 10px; margin: 0; }
  .sidebar-foot { margin-left: auto; border-top: 0; padding: 8px 14px; }
  .credits { display: none; }
  .topbar { position: static; flex-wrap: wrap; align-items: center; padding: 14px 16px 12px; }
  .topbar-actions { flex-wrap: wrap; }
  #pages { padding: 16px 14px 48px; }
  .row-2 { grid-template-columns: 1fr; }
  #front-3d { height: 340px; }
}
@media (max-width: 520px) {
  .topbar > div:first-child { flex: 1 0 100%; }
  .seg { display: flex; flex-wrap: wrap; }
  .seg-btn { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important;
    animation-iteration-count: 1 !important; transition-duration: .01ms !important;
    scroll-behavior: auto !important; }
}

@media (forced-colors: active) {
  .seg-btn.active, .nav-item.active { outline: 2px solid CanvasText; }
  .swatch { forced-color-adjust: none; }
}
.hl > span { display: block; }
.row-pick { font: inherit; font-weight: 650; color: var(--accent); background: none;
  border: 1px solid transparent; border-radius: 6px; min-width: 32px; min-height: 26px;
  padding: 2px 8px; cursor: pointer; text-align: left; }
.row-pick:hover { border-color: var(--line); }
.row-pick[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
th[scope=row] { text-align: left; font-size: inherit; text-transform: none; letter-spacing: 0;
  position: static; background: none; border-bottom: 1px solid var(--line-2); color: inherit; }

/* =====================================================================
   UI review 2026-11-02 (Web Interface Guidelines + UX heuristic review)
   ===================================================================== */

/* Native controls (select menus, scrollbars, the file button, date
   pickers) follow the theme instead of staying light in dark mode. */
:root { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { color-scheme: dark; } }

button, .btn, .seg-btn, .nav-item, .q, summary { touch-action: manipulation; }
:where(button, .btn, .seg-btn, .nav-item, .hl, .row-pick, input, select, textarea) {
  transition: background-color .12s ease, border-color .12s ease, color .12s ease, box-shadow .12s ease; }

/* File inputs: the bare browser button looked like a different program. */
input[type=file]::file-selector-button {
  font: inherit; font-weight: 600; font-size: 12.5px; margin-right: 10px;
  padding: 6px 12px; border: 1px solid var(--line); border-radius: 7px;
  background: var(--panel-2); color: var(--ink); cursor: pointer; }
input[type=file]::file-selector-button:hover { border-color: var(--muted); }
input[type=file] { color: var(--ink-2); }

/* Busy buttons say so in text and with a small spinner. */
.btn[aria-busy="true"] { cursor: progress; }
.btn[aria-busy="true"]::before { content: ""; display: inline-block; width: 12px; height: 12px;
  margin-right: 8px; vertical-align: -1px; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent;
  animation: spin .7s linear infinite; }

/* ------------------------------------------------ inline field checks */
.field-hint { display: block; font-size: 12px; color: var(--muted); margin-top: 4px;
  font-variant-numeric: tabular-nums; min-height: 0; }
.field-hint:empty { display: none; }
.field-err { display: block; font-size: 12px; color: var(--danger); margin-top: 4px; font-weight: 600; }
.field-err:empty { display: none; }
input[aria-invalid="true"], select[aria-invalid="true"], textarea[aria-invalid="true"] {
  border-color: var(--danger); background: var(--danger-soft); }
input[aria-invalid="true"]:focus { outline-color: var(--danger); }
.check-list { margin: 8px 0 0; padding-left: 18px; }
.check-list a { color: inherit; }

/* ------------------------------------------- component cards, collapsed */
/* A technology that is not included shows its name and one line, not a
   page of greyed-out fields: the page is about what WILL be sized. */
.comp-head { display: flex; justify-content: space-between; align-items: center;
  gap: 12px; margin-bottom: 8px; }
.comp-head h2 { margin: 0; }
.comp-toggle { display: flex; gap: 7px; align-items: center; font-size: 12.5px;
  font-weight: 600; cursor: pointer; padding: 4px 8px; border-radius: 6px; min-height: 30px; }
.comp-toggle:hover { background: var(--panel-2); }
.card.comp-off { padding-top: 12px; padding-bottom: 12px; box-shadow: none;
  background: var(--panel-2); }
.card.comp-off .comp-head { margin-bottom: 0; }
.card.comp-off h2 { color: var(--ink-2); }
.comp-off-note { font-size: 12px; color: var(--muted); font-weight: 400; margin-left: 8px; }
.comp-summary { font-size: 12.5px; color: var(--muted); margin: -2px 0 12px; }
.group-heading { font-size: 13px; text-transform: uppercase; letter-spacing: .06em;
  color: var(--ink-2); margin: 22px 0 10px; }

/* --------------------------------------------------------- KPI tiles */
.kpis { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
.kpi-val { white-space: nowrap; font-size: clamp(16px, 1.45vw, 19px); }
.kpis.kpis-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 760px) { .kpis.kpis-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.kpi.kpi-good .kpi-val { color: var(--ok); }
.kpi.kpi-bad .kpi-val { color: var(--danger); }

/* Tables that carry sentences wrap; numeric tables stay on one line. */
table.wrap th, table.wrap td { white-space: normal; text-align: left; vertical-align: top; }
table.wrap td:first-child { white-space: nowrap; }

/* ------------------------------------------------------ empty states */
.empty { text-align: center; padding: 40px 24px; }
.empty-icon { font-size: 26px; line-height: 1; margin-bottom: 10px; color: var(--muted); }
.empty h2 { font-size: 16px; margin-bottom: 6px; }
.empty p { color: var(--muted); max-width: 520px; margin: 0 auto 16px; }
.empty .steps { display: inline-flex; flex-direction: column; gap: 6px; text-align: left;
  margin: 0 auto 18px; padding: 0; list-style: none; font-size: 13px; }
.empty .steps li { display: flex; gap: 8px; align-items: center; color: var(--ink-2); }
.empty .steps li.ok { color: var(--ok); }
.empty .steps li::before { content: "○"; width: 16px; text-align: center; }
.empty .steps li.ok::before { content: "✓"; font-weight: 700; }

/* ------------------------------------------- selected-design context */
.design-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px;
  padding: 10px 14px; margin-bottom: 16px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--panel); box-shadow: var(--shadow); }
.design-bar .db-title { font-weight: 650; }
.design-bar .db-sub { color: var(--muted); font-size: 12.5px; }
.design-bar .db-actions { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; }
.design-bar .btn { padding: 6px 11px; font-size: 12.5px; }
.badge.rec { background: var(--accent); color: var(--accent-ink); }

/* -------------------------------------------------------- run feedback */
.run-meta { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.run-elapsed { font-variant-numeric: tabular-nums; color: var(--muted); font-size: 12.5px; }
.progress.done .bar { display: none; }

/* ------------------------------------------------- report summary */
.report-summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px; margin: 4px 0 16px; }
.report-summary div { background: var(--panel-2); border: 1px solid var(--line-2);
  border-radius: 8px; padding: 10px 12px; font-size: 12.5px; }
.report-summary b { display: block; font-size: 12px; color: var(--muted); font-weight: 650;
  text-transform: uppercase; letter-spacing: .05em; margin-bottom: 2px; }

kbd { font: 600 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  padding: 2px 5px; border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 4px; background: var(--panel-2); color: var(--ink-2); }
.kbd-hint { font-size: 12px; color: var(--muted); margin-top: 8px; }
.kbd-hint:empty { display: none; }