/* ===========================================================================
   explore-lab.css — the Unit 1 Explore labs, in the house style
   ---------------------------------------------------------------------------
   Shared by every lab built on explore-lab.js: header, Start-here card and
   mission banner, bench stage (canvas + particle view), guided checklist,
   equations strip, lab notebook, calculation stepper, and result.
   Uses the house tokens (house.css); Unit 1's flame colour arrives as --unit.
   =========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Kalam:wght@400;700&display=swap');
.xl { --xl-gap: 18px; display: grid; gap: 20px; }
.xl-head h2 { margin: 6px 0 8px; font: 700 clamp(1.8rem, 4vw, 2.6rem)/1.06 var(--h-display) !important; background: var(--h-gold-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; padding-bottom: .08em; text-wrap: balance; }
.xl-head p { margin: 0; max-width: 64ch; color: var(--h-text-2); line-height: 1.6; }
.xl-kicker { font: 600 .72rem/1.2 var(--h-sans); letter-spacing: .18em; text-transform: uppercase; color: var(--unit) !important; }
.xl-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 320px); gap: var(--xl-gap); align-items: start; }
@media (max-width: 980px) { .xl-grid { grid-template-columns: 1fr; } }
.xl-bench, .xl-notebook, .xl-banner, .xl-start { border: 1px solid var(--h-line); border-radius: 18px; background: var(--h-panel); }
.xl-bench { position: relative; display: grid; gap: 14px; padding: 16px; min-width: 0; container-type: inline-size; }
@container (max-width: 700px) {
  .xl-samples { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
  .xl-sample { min-height: 0; }
  .xl-steps { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
}
.xl-k { font: 600 .72rem/1.2 var(--h-sans); letter-spacing: .03em; text-transform: none; color: var(--h-muted); }
.xl-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; }
.xl-row:empty { display: none; }

/* ---------- Start here ---------- */
.xl-start { display: grid; gap: 14px; padding: 22px 24px; border-color: color-mix(in srgb, var(--unit) 40%, transparent); background: linear-gradient(130deg, color-mix(in srgb, var(--unit) 10%, var(--h-panel)), var(--h-panel) 65%); animation: xl-in .45s cubic-bezier(.25,1,.5,1); }
.xl-start .xl-k { color: var(--unit); }
.xl-start h3 { margin: 0; font: 600 clamp(1.25rem, 2.6vw, 1.6rem)/1.25 var(--h-sans) !important; color: var(--h-text) !important; }
.xl-plan { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 0; padding: 0; list-style: none; counter-reset: none; }
@media (max-width: 720px) { .xl-plan { grid-template-columns: 1fr; } }
.xl-plan li { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 12px; background: rgba(255,255,255,.04); font: 500 .9rem/1.35 var(--h-sans); color: var(--h-text); }
.xl-plan li span { display: grid; place-items: center; flex: none; width: 24px; height: 24px; border-radius: 50%; border: 1px solid var(--unit); color: var(--unit); font: 700 .74rem/1 var(--h-sans); }
.xl-start-note { margin: 0; padding: 10px 14px; border-radius: 12px; background: rgba(242,191,94,.06); box-shadow: inset 3px 0 0 var(--h-gold-2); color: var(--h-text-2); line-height: 1.6; }
.xl-start-how { margin: 0; color: var(--h-text-2); line-height: 1.6; max-width: 70ch; }
.xl-start-how b { color: var(--h-text); }
.xl-eq-inline { font-weight: 600; color: var(--h-text); white-space: nowrap; }
.xl-eq-inline b { color: var(--h-gold-1); }
.xl-btn.is-big { min-height: 52px; padding: 0 24px; font-size: 1rem !important; }
.xl-btn svg { width: 18px; height: 18px; vertical-align: -4px; margin-left: 4px; }

/* ---------- mission banner ---------- */
.xl-banner { display: grid; gap: 14px; padding: 16px 20px 20px; border-color: rgba(242,191,94,.32); scroll-margin-top: 140px; }
.xl-banner.is-free { border-color: var(--h-line); }
.xl-banner h3 { margin: 0; font: 600 1.25rem/1.3 var(--h-sans) !important; color: var(--h-text) !important; }
.xl-strip { display: flex; align-items: center; gap: 6px; }
.xl-seg { flex: 1; max-width: 90px; min-height: 24px; padding: 0; border: 0; background: none; cursor: pointer; }
.xl-seg i { display: block; height: 5px; border-radius: 5px; background: rgba(255,255,255,.1); transition: background-color .25s, box-shadow .25s; }
.xl-seg:hover i { background: rgba(242,191,94,.3); }
.xl-seg.is-cur i { background: rgba(242,191,94,.5); }
.xl-seg.is-done i { background: var(--h-gold-2); box-shadow: 0 0 8px rgba(242,191,94,.5); }
.xl-strip-n { margin-left: auto; font-size: .82rem; color: var(--h-muted); white-space: nowrap; }
.xl-strip-n b { color: var(--h-gold-1); }
.xl-bn-head { display: grid; gap: 6px; }
.xl-bn-head .xl-k { color: var(--unit); }
.xl-bn-body { display: grid; gap: 10px; max-width: 78ch; animation: xl-in .35s cubic-bezier(.25,1,.5,1); }
.xl-pills { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.xl-pill { display: inline-flex; align-items: center; gap: 5px; padding: 5px 12px; border-radius: var(--h-pill); font: 600 .7rem/1.2 var(--h-sans); letter-spacing: .1em; text-transform: uppercase; color: var(--h-muted); background: rgba(255,255,255,.04); }
.xl-pill svg { width: 12px; height: 12px; }
.xl-pill.is-now { color: var(--h-on-gold); background: var(--h-gold-grad); }
.xl-pill.is-done { color: var(--h-gold-1); background: rgba(242,191,94,.12); }
.xl-pill-sep { color: var(--h-muted); }
.xl-hint { margin: 0; font-size: .88rem; color: var(--h-muted); }
.xl-q { margin: 0; color: var(--h-text); line-height: 1.55; font-size: 1.02rem; }
.xl-choices { display: grid; gap: 6px; }
.xl-choice { min-height: 44px; padding: 10px 14px; border: 1px solid var(--h-line-2); border-radius: 12px; background: transparent; color: var(--h-text); text-align: left; font: 500 .94rem/1.4 var(--h-sans) !important; cursor: pointer; transition: border-color .2s, background-color .2s, transform .2s; }
.xl-choice:hover { border-color: rgba(242,191,94,.6); background: rgba(242,191,94,.06); transform: translateX(2px); }
.xl-choice.is-wrong { border-color: var(--h-bad); background: rgba(240,132,110,.08); animation: xl-settle .35s ease; }
.xl-pred { margin: 0; font-size: .9rem; color: var(--h-text-2); }
.xl-pred b { color: var(--h-text); }
.xl-pred.is-match { color: var(--h-good); }
.xl-pred.is-miss { color: var(--h-gold-1); }
.xl-wait { display: flex; align-items: center; gap: 10px; margin: 0; font-size: .9rem; color: var(--h-gold-1); }
.xl-pulse { flex: none; width: 9px; height: 9px; border-radius: 50%; background: var(--unit); box-shadow: 0 0 0 0 color-mix(in srgb, var(--unit) 60%, transparent); animation: xl-pulse 1.6s ease-out infinite; }
.xl-result-line { display: grid; gap: 4px; padding: 10px 12px; border-radius: 12px; background: rgba(255,255,255,.04); font-size: .94rem; color: var(--h-text-2); }
.xl-result-line b { color: var(--h-gold-1); }
.xl-fb { margin: 0; font-size: .92rem; line-height: 1.55; }
.xl-fb:empty { display: none; }
.xl-fb.is-wrong { color: var(--h-text-2); padding: 10px 12px; border-radius: 12px; background: rgba(240,132,110,.07); box-shadow: inset 3px 0 0 var(--h-bad); }
.xl-fb.is-right { display: flex; gap: 10px; align-items: flex-start; color: var(--h-text); padding: 10px 12px; border-radius: 12px; background: rgba(126,211,162,.07); }
.xl-fb.is-right svg { width: 18px; height: 18px; flex: none; color: var(--h-good); margin-top: 2px; }
.xl-write summary, .xl-why summary { cursor: pointer; min-height: 36px; display: flex; align-items: center; font: 500 .88rem/1.2 var(--h-sans) !important; color: var(--h-gold-1); }
.xl-write textarea { width: 100%; margin: 6px 0; padding: 10px 12px; border: 1px solid var(--h-line-2); border-radius: 12px; background: var(--h-panel-3); color: var(--h-text); font: 400 .92rem/1.5 var(--h-sans); resize: vertical; }
.xl-link { min-height: 36px; padding: 0; border: 0; background: none; color: var(--h-gold-1); font: 500 .88rem/1.2 var(--h-sans) !important; text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }
.xl-model { margin: 6px 0 0; padding: 10px 12px; border-radius: 12px; background: rgba(242,191,94,.06); box-shadow: inset 3px 0 0 var(--h-gold-2); font-size: .9rem; line-height: 1.55; color: var(--h-text-2); }
.xl-done-badge { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: var(--h-pill); background: rgba(126,211,162,.1); color: var(--h-good); font: 600 .88rem/1 var(--h-sans); }
.xl-done-badge svg { width: 16px; height: 16px; }
/* focus glow: a slow pulse on the one section the student should look at (the lab sets data-focus) */
.xl[data-focus="banner"] .xl-mission-host > .xl-banner:not(.is-free),
.xl[data-focus="banner"] .xl-mission-host > .xl-start,
.xl[data-focus="samples"] .xl-samples,
.xl[data-focus="bench"] .xl-steppanel > .xl-card { border-color: rgba(242,191,94,.55); animation: xl-in .35s cubic-bezier(.25,1,.5,1), xl-glow 3.2s ease-in-out infinite; }
.xl[data-focus="samples"] .xl-samples { border-radius: 16px; }
.xl .xl-banner.xl-celebrate { animation: xl-crystal .8s cubic-bezier(.25,1,.5,1), xl-glow 3.2s ease-in-out .8s infinite; }

/* ---------- samples (free lab) ---------- */
.xl-samples { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.xl-samples[hidden], .xl-loaded[hidden] { display: none; }
.xl-sample { display: grid; align-content: start; gap: 4px; min-height: 92px; padding: 12px; border: 1px solid var(--h-line); border-radius: 14px; background: var(--h-panel-2); color: var(--h-text); text-align: left; cursor: pointer; transition: border-color .2s, background-color .2s, transform .2s; }
.xl-sample:hover { border-color: rgba(242,191,94,.5); transform: translateY(-1px); }
.xl-sample[aria-checked="true"] { border-color: var(--unit); background: color-mix(in srgb, var(--unit) 10%, var(--h-panel-2)); box-shadow: 0 0 0 1px color-mix(in srgb, var(--unit) 40%, transparent); }
.xl-sample b { font: 600 .98rem/1.2 var(--h-sans); }
.xl-sample-tag { font: 600 .62rem/1 var(--h-sans); letter-spacing: .16em; text-transform: uppercase; color: var(--h-muted); }
.xl-sample[aria-checked="true"] .xl-sample-tag { color: var(--unit); }
.xl-sample-blurb { font: 400 .8rem/1.35 var(--h-sans); color: var(--h-muted); }
.xl-loaded { margin: 0; padding: 10px 14px; border-radius: 12px; background: rgba(255,255,255,.03); font-size: .9rem; color: var(--h-text-2); }
.xl-loaded .xl-k { margin-right: 6px; color: var(--unit); }
.xl-loaded b { color: var(--h-text); }

/* ---------- the stage: bench canvas, particle view beside it or behind Zoom ---------- */
.xl-stage { position: relative; border-radius: 14px; overflow: hidden; background: radial-gradient(80% 90% at 50% 100%, color-mix(in srgb, var(--unit) 8%, transparent), transparent 70%), #0E0C0A; border: 1px solid var(--h-line); }
.xl-views { display: grid; }
.xl-views.is-split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.xl-views.is-split .xl-view-particles { border-left: 1px solid var(--h-line); animation: xl-in .4s cubic-bezier(.25,1,.5,1); }
.xl-views.is-split .xl-canvas, .xl-views.is-split .xl-pcanvas { aspect-ratio: 4 / 3; }
.xl-views.is-split .xl-view-bench { align-self: center; }
.xl-canvas { display: block; width: 100%; aspect-ratio: 16 / 8; }
.xl-stage.is-zoomed .xl-view-bench { display: none; }
.xl-stage.is-zoomed .xl-view-k { padding-top: 60px; }   /* clear of the "Back to the bench" button */
.xl-view-particles { display: grid; align-content: start; gap: 8px; padding-bottom: 10px; }
.xl-view-particles[hidden] { display: none; }
.xl-view-k { margin: 0; padding: 10px 14px 0; font: 500 .84rem/1.45 var(--h-sans); color: var(--h-text-2); }
.xl-pcanvas { display: block; width: 100%; aspect-ratio: 16 / 8; }
.xl-scene-cap { margin: 0; min-height: 1.5em; padding: 0 16px 12px; font-size: .92rem; color: var(--h-text-2); }
.xl-zoom { position: absolute; top: 10px; right: 10px; display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 14px; border: 1px solid var(--h-line-2); border-radius: var(--h-pill); background: rgba(11,10,9,.75); color: var(--h-gold-1); font: 600 .82rem/1 var(--h-sans) !important; cursor: pointer; -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); z-index: 2; }
.xl-zoom[hidden] { display: none; }
.xl-zoom svg { width: 18px; height: 18px; }
.xl-zoom:hover { background: rgba(242,191,94,.12); }
.xl-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; padding: 0 14px; font: 500 .8rem/1 var(--h-sans); color: var(--h-text-2); }
.xl-legend span { display: inline-flex; align-items: center; gap: 6px; }
.xl-legend i { width: 11px; height: 11px; border-radius: 50%; }
.xl-legend i.is-bound { background: transparent; border: 1.5px solid rgba(255,224,154,.8); }

/* the bench waits for a prediction */
.xl-lock { position: absolute; inset: 0; z-index: 3; display: grid; place-items: center; padding: 20px; border-radius: 18px; background: rgba(11,10,9,.55); -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px); }
.xl-lock[hidden] { display: none; }
.xl-lock p { margin: 0; padding: 12px 20px; border: 1px solid rgba(242,191,94,.4); border-radius: var(--h-pill); background: rgba(11,10,9,.85); color: var(--h-text); font: 500 .95rem/1.4 var(--h-sans); text-align: center; }
.xl-lock b { color: var(--h-gold-1); }
.xl-bench.is-locked > :not(.xl-lock) { pointer-events: none; user-select: none; }

/* ---------- equations, as reactions happen ---------- */
.xl-eq { display: grid; gap: 6px; padding: 12px 16px; border-radius: 14px; border: 1px solid color-mix(in srgb, var(--unit) 30%, transparent); background: color-mix(in srgb, var(--unit) 6%, rgba(255,255,255,.02)); animation: xl-in .35s cubic-bezier(.25,1,.5,1); }
.xl-eq[hidden] { display: none; }
.xl-eq p { margin: 0; }
.xl-eq-k { font: 600 .72rem/1.2 var(--h-sans); letter-spacing: .03em; text-transform: none; color: var(--unit); }
.xl-eq-l, .xl-eq-net { font: 500 1rem/1.5 var(--h-sans); color: var(--h-text); }
.xl-eq-l b, .xl-eq-net b { color: var(--h-gold-1); }
.xl-eq-dim { color: var(--h-text-2); font-size: .92rem; }
.xl-eq-net { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; padding-top: 6px; border-top: 1px solid var(--h-line); }
.xl-eq-tag { padding: 3px 9px; border-radius: var(--h-pill); background: var(--h-gold-grad); color: var(--h-on-gold); font: 700 .64rem/1.2 var(--h-sans); letter-spacing: .1em; text-transform: uppercase; }
.xl-eq-spect { font-size: .88rem; line-height: 1.6; color: var(--h-text-2); }
.xl-sp { display: inline-block; padding: 0 7px; border-radius: 6px; background: rgba(255,255,255,.06); color: var(--h-text); }

/* ---------- procedure ---------- */
.xl-steps { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 6px; margin: 0; padding: 0; list-style: none; counter-reset: none; }
.xl-steps li { display: flex; align-items: center; gap: 8px; min-width: 0; padding: 8px 10px; border-radius: 10px; font: 500 .8rem/1.2 var(--h-sans); color: var(--h-muted); background: rgba(255,255,255,.03); }
.xl-steps li > span:last-child { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.xl-step-n { display: grid; place-items: center; flex: none; width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--h-line-2); font: 700 .72rem/1 var(--h-sans); }
.xl-steps li.is-now { color: var(--h-text); background: color-mix(in srgb, var(--unit) 12%, transparent); }
.xl-steps li.is-now .xl-step-n { border-color: var(--unit); color: var(--unit); }
.xl-steps li.is-done { color: var(--h-text-2); }
.xl-steps li.is-done .xl-step-n { background: var(--unit); border-color: var(--unit); color: var(--h-ink); }
.xl-steppanel { display: grid; gap: 10px; }
.xl-steppanel:empty { display: none; }
.xl-steppanel p { margin: 0; color: var(--h-text-2); line-height: 1.6; max-width: 70ch; }
.xl-card { display: grid; gap: 12px; padding: 16px; border-radius: 14px; background: var(--h-panel-2); border: 1px solid var(--h-line); animation: xl-in .3s cubic-bezier(.25,1,.5,1); }
.xl-step-title { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; font: 600 1.12rem/1.3 var(--h-sans) !important; color: var(--h-text) !important; }
.xl-badge { padding: 4px 10px; border-radius: var(--h-pill); background: color-mix(in srgb, var(--unit) 16%, transparent); color: var(--unit); font: 700 .66rem/1.2 var(--h-sans); letter-spacing: .12em; text-transform: uppercase; }

/* the checklist: ticks, one action to take now, the rest waiting */
.xl-check { display: grid; gap: 6px; margin: 0; padding: 0; list-style: none; counter-reset: none; }
.xl-check li { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; min-height: 36px; padding: 6px 10px; border-radius: 12px; font: 500 .94rem/1.4 var(--h-sans); }
.xl-check li:not(.is-active) { flex-wrap: nowrap; }
.xl-check li.is-done { color: var(--h-text-2); }
.xl-check li.is-todo { color: var(--h-muted); }
.xl-check li.is-active { padding: 10px 12px; background: rgba(242,191,94,.07); box-shadow: inset 0 0 0 1px rgba(242,191,94,.38); }
.xl-tick { display: grid; place-items: center; flex: none; width: 22px; height: 22px; border-radius: 50%; background: color-mix(in srgb, var(--h-good) 18%, transparent); color: var(--h-good); }
.xl-tick svg { width: 14px; height: 14px; }
.xl-dot { flex: none; width: 22px; display: grid; place-items: center; }
.xl-dot::before { content: ''; width: 7px; height: 7px; border-radius: 50%; border: 1.5px solid var(--h-line-2); }
.xl-now { flex-basis: 100%; display: flex; align-items: center; gap: 8px; font: 600 .66rem/1.2 var(--h-sans); letter-spacing: .16em; text-transform: uppercase; color: var(--h-gold-1); }
.xl-now::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--unit); animation: xl-pulse 1.6s ease-out infinite; }
.xl-check li.is-active .xl-btn { min-height: 46px; white-space: normal; text-align: left; line-height: 1.25 !important; padding: 10px 20px; }
.xl-why { padding: 2px 12px 6px; border-radius: 12px; background: rgba(255,255,255,.025); }
.xl-why[open] summary { margin-bottom: 2px; }
.xl-why p { font-size: .92rem; }
.xl-reading { font-variant-numeric: tabular-nums; }
.xl-reading b { color: var(--h-gold-1); font-size: 1.05em; }
.xl-dry { width: 100%; max-width: 420px; border-collapse: collapse; font-variant-numeric: tabular-nums; font-size: .9rem; }
.xl-dry th { padding: 6px 8px; text-align: left; font: 600 .74rem/1.2 var(--h-sans) !important; letter-spacing: .02em; text-transform: none; color: var(--h-muted); border-bottom: 1px solid var(--h-line); }
.xl-dry td { padding: 6px 8px; color: var(--h-text); border-bottom: 1px solid var(--h-line); }

.xl-btn { min-height: 44px; padding: 0 18px; border: 1px solid var(--h-line-2); border-radius: var(--h-pill); background: transparent; color: var(--h-text); font: 600 .9rem/1 var(--h-sans) !important; cursor: pointer; transition: background-color .2s, border-color .2s, transform .2s, opacity .2s; }
.xl-btn:hover:not(:disabled) { background: rgba(242,191,94,.08); border-color: rgba(242,191,94,.55); }
.xl-btn.is-primary { border-color: transparent; background: var(--h-gold-grad); color: var(--h-on-gold); box-shadow: 0 4px 18px rgba(242,191,94,.22); }
.xl-btn.is-primary:hover:not(:disabled) { transform: translateY(-1px); background: var(--h-gold-grad); }
.xl-btn:disabled { opacity: .38; cursor: default; box-shadow: none; }
.xl-note { padding: 10px 14px; border-radius: 12px; background: rgba(255,255,255,.04); font-size: .92rem; }
.xl-note.is-good { box-shadow: inset 3px 0 0 var(--h-good); }
.xl-note.is-warn { box-shadow: inset 3px 0 0 var(--h-gold-2); }

/* ---------- notebook: a paper page the student writes in by hand ----------
   Ruled lines every 32px line up with the rows; a red margin line on the left;
   pen-blue handwriting (Kalam) for what the student records. */
.xl .xl-notebook { --nb-line: 32px; --nb-ink: #22357A; --nb-pencil: #4E4A42; position: relative; padding: 14px 16px 18px 44px; border: 0; border-radius: 6px 10px 10px 6px;
  background: linear-gradient(90deg, transparent 33px, rgba(205,72,72,.55) 33px 34.5px, transparent 34.5px),
    repeating-linear-gradient(to bottom, transparent 0 calc(var(--nb-line) - 1px), rgba(64,98,170,.32) calc(var(--nb-line) - 1px) var(--nb-line)),
    linear-gradient(180deg, #EFE7D2, #E6DCC2);
  background-position: 0 0, 0 9px, 0 0;   /* rules sit just under the handwriting baseline */
  box-shadow: 0 1px 0 rgba(255,255,255,.25) inset, 0 14px 34px rgba(0,0,0,.45), 0 2px 6px rgba(0,0,0,.3); color: var(--nb-pencil); }
.xl .xl-notebook::before { content: ''; position: absolute; left: 12px; top: 18px; bottom: 18px; width: 9px; background: radial-gradient(circle, rgba(20,16,12,.55) 0 3.6px, transparent 4.2px) 0 0 / 9px 46px repeat-y; }   /* punched holes */
@media (min-width: 981px) { .xl-notebook { position: sticky; top: 140px; } }
.xl-nb-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; height: var(--nb-line); }
html body .xl .xl-nb-head h3 { margin: 0; font: 700 1.25rem/var(--nb-line) 'Kalam', 'Segoe Print', 'Bradley Hand', cursive !important; letter-spacing: 0; text-transform: none; color: var(--nb-ink) !important; }
.xl-nb-trial { font: 400 .98rem/var(--nb-line) 'Kalam', 'Segoe Print', cursive; color: var(--nb-pencil); text-align: right; }
.xl .xl-notebook table { width: 100%; border-collapse: collapse; background: none; }
.xl .xl-notebook tr { background: none !important; }
.xl .xl-notebook th, .xl .xl-notebook td { padding: 0 0 0 6px; border: 0; background: none !important; vertical-align: top; }
html body .xl .xl-notebook th { font-family: 'Kalam', 'Segoe Print', cursive !important; padding-left: 0; min-width: 7.5em; text-align: left; font: 400 1rem/var(--nb-line) 'Kalam', 'Segoe Print', cursive !important; color: var(--nb-pencil) !important; }
.xl .xl-notebook td { text-align: right; font: 700 1.12rem/var(--nb-line) 'Kalam', 'Segoe Print', cursive; color: var(--nb-ink); }
.xl .xl-notebook td:last-child { width: 2.6em; font-weight: 400; color: var(--nb-pencil); text-align: left; }
.xl-nb-empty { margin: 0; font: 400 1rem/var(--nb-line) 'Kalam', 'Segoe Print', cursive; color: rgba(78,74,66,.7); }

/* ---------- calculation stepper ---------- */
.xl-cdone-list { display: grid; gap: 4px; margin: 0; padding: 0; list-style: none; counter-reset: none; }
.xl-cdone-list:empty { display: none; }
.xl-cdone { display: flex; align-items: center; gap: 10px; padding: 6px 10px; border-radius: 10px; background: rgba(126,211,162,.05); font-size: .9rem; color: var(--h-text-2); }
.xl-cdone b { margin-left: auto; color: var(--h-text); font-variant-numeric: tabular-nums; }
.xl-cstep { display: grid; gap: 10px; padding: 14px; border-radius: 14px; box-shadow: inset 0 0 0 1px rgba(242,191,94,.38); background: rgba(242,191,94,.04); }
.xl-cstep-k { font: 600 .74rem/1.2 var(--h-sans); letter-spacing: .03em; text-transform: none; color: var(--h-gold-1) !important; }
.xl-formula { padding: 10px 14px; border-radius: 10px; background: rgba(0,0,0,.25); font: 500 .98rem/1.5 var(--h-sans); color: var(--h-text) !important; white-space: pre-wrap; }
.xl-how b { color: var(--h-text); }
.xl-ask { font: 500 1.02rem/1.5 var(--h-sans); color: var(--h-text) !important; }
.xl-hintbox { display: grid; gap: 8px; padding: 12px 14px; border-radius: 12px; background: rgba(242,191,94,.06); box-shadow: inset 3px 0 0 var(--h-gold-2); animation: xl-in .3s cubic-bezier(.25,1,.5,1); }
.xl-hintbox .xl-k { color: var(--h-gold-1); }
.xl-cin-row { display: flex; align-items: center; gap: 10px; }
.xl-cin { flex: 1; min-width: 0; min-height: 48px; padding: 0 14px; border: 1px solid var(--h-line-2); border-radius: 12px; background: var(--h-panel-3); color: var(--h-text); font: 500 1rem/1 var(--h-sans); font-variant-numeric: tabular-nums; }
.xl-cin:focus { outline: none; border-color: var(--h-gold-2); box-shadow: 0 0 0 3px rgba(242,191,94,.18); }
.xl-unit { color: var(--h-muted); min-width: 2.4em; }
.xl-live { font-size: .9rem; color: var(--h-muted) !important; }
.xl-live b { color: var(--h-gold-1); }
.xl-worked { margin: 0; padding: 12px 14px; border-radius: 12px; background: rgba(255,255,255,.03); font: 400 .92rem/1.7 var(--h-mono); color: var(--h-text-2); }

/* ---------- result ---------- */
.xl-result { display: grid; gap: 12px; margin-top: 6px; padding: 18px; border: 1px solid color-mix(in srgb, var(--unit) 35%, transparent); border-radius: 16px; background: linear-gradient(120deg, color-mix(in srgb, var(--unit) 9%, var(--h-panel-2)), var(--h-panel-2) 70%); animation: xl-in .45s cubic-bezier(.25,1,.5,1); }
.xl-result-nums { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.xl-result-nums span { display: block; font-size: .78rem; color: var(--h-muted); }
.xl-result-nums b { display: block; margin-top: 4px; font: 700 clamp(1.4rem, 5vw, 2.2rem)/1.05 var(--h-display); background: var(--h-gold-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; font-variant-numeric: tabular-nums; }
.xl-numline { width: 100%; height: auto; overflow: visible; }
.xl-nl-axis { stroke: rgba(237,230,216,.3); stroke-width: 1; }
.xl-nl-t { fill: var(--h-muted); font: 500 10px var(--h-sans); text-anchor: middle; }
.xl-nl-ref { fill: var(--h-muted); }
.xl-nl-ref.is-nacl { fill: var(--h-gold-2); }
.xl-nl-l { fill: var(--h-text-2); font: 600 10px var(--h-sans); text-anchor: middle; }
.xl-nl-l.is-nacl { fill: var(--h-gold-1); }
.xl-nl-you { fill: var(--unit); }
.xl-nl-you-t { fill: var(--unit); font: 700 10px var(--h-sans); text-anchor: middle; }
.xl-review { padding: 12px 14px; border-radius: 12px; background: rgba(240,132,110,.08); box-shadow: inset 3px 0 0 var(--h-bad); }
.xl-review p { margin: 0 0 6px; }
.xl-review-k { font: 600 .7rem/1.2 var(--h-sans); letter-spacing: .16em; text-transform: uppercase; color: var(--h-bad) !important; }
.xl-review-ok { padding: 10px 14px; border-radius: 12px; background: rgba(126,211,162,.07); box-shadow: inset 3px 0 0 var(--h-good); }

@keyframes xl-in { from { opacity: 0; transform: translateY(8px); } }
@keyframes xl-settle { 30% { transform: translateX(-5px); } 60% { transform: translateX(3px); } }
@keyframes xl-pulse { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--unit) 60%, transparent); } 70% { box-shadow: 0 0 0 9px transparent; } 100% { box-shadow: 0 0 0 0 transparent; } }
@keyframes xl-glow { 0%, 100% { box-shadow: 0 0 0 1px rgba(242,191,94,.28), 0 0 12px 0 rgba(242,191,94,.08); } 50% { box-shadow: 0 0 0 1px rgba(242,191,94,.6), 0 0 34px 4px rgba(242,191,94,.26); } }
@keyframes xl-crystal { 0% { box-shadow: 0 0 0 0 rgba(255,224,154,.6); } 100% { box-shadow: 0 0 0 16px rgba(255,224,154,0); } }
@media (prefers-reduced-motion: reduce) {
  .xl-result, .xl-bn-body, .xl-start, .xl-card, .xl-eq, .xl-views.is-split .xl-view-particles, .xl-choice.is-wrong, .xl-banner.xl-celebrate { animation: none; }
  .xl-pulse, .xl-now::before { animation: none; }
  .xl[data-focus] .xl-mission-host > *, .xl[data-focus="samples"] .xl-samples, .xl[data-focus="bench"] .xl-steppanel > .xl-card, .xl .xl-banner.xl-celebrate { animation: none; }
  .xl[data-focus="banner"] .xl-mission-host > .xl-banner:not(.is-free), .xl[data-focus="banner"] .xl-mission-host > .xl-start, .xl[data-focus="samples"] .xl-samples, .xl[data-focus="bench"] .xl-steppanel > .xl-card { box-shadow: 0 0 0 1px rgba(242,191,94,.55), 0 0 24px 2px rgba(242,191,94,.18); }
}

/* ---------- 1.1: five substances, particle-count bars ---------- */
.xl-samples.is-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.xl-bars { display: grid; gap: 8px; }
.xl-bar { display: grid; grid-template-columns: minmax(0, 8.5em) minmax(0, 1fr) auto; align-items: center; gap: 10px; font-size: .88rem; color: var(--h-text-2); }
.xl-bar b { color: var(--h-text); font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }
.xl-bar-track { height: 10px; border-radius: 6px; background: rgba(255,255,255,.06); overflow: hidden; }
.xl-bar-track i { display: block; height: 100%; border-radius: 6px; transition: width .6s cubic-bezier(.25,1,.5,1); }
@media (max-width: 520px) { .xl-bar { grid-template-columns: 1fr auto; } .xl-bar-track { grid-column: 1 / -1; grid-row: 2; } }
.xl-view-k b { color: var(--h-text); font-weight: 600; }
@container (max-width: 700px) { .xl-samples.is-5 { grid-template-columns: repeat(auto-fit, minmax(104px, 1fr)) !important; } }
.xl-steps[data-n="3"] { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.xl-steps[data-n="4"] { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@container (max-width: 700px) { .xl-steps[data-n="4"] { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; } }
.xl-unit { max-width: 5.2em; font-size: .86rem; line-height: 1.15; }

/* ---------- 1.8: bench modes, main-group table, ion tray, charge meter ---------- */
.xl-modes { display: flex; gap: 6px; padding: 4px; border-radius: var(--h-pill); background: rgba(255,255,255,.04); width: max-content; max-width: 100%; }
.xl-modes[hidden] { display: none; }
.xl-modes button { min-height: 40px; padding: 0 16px; border: 0; border-radius: var(--h-pill); background: none; color: var(--h-text-2); font: 600 .86rem/1 var(--h-sans) !important; cursor: pointer; }
.xl-modes button[aria-selected="true"] { background: var(--h-gold-grad); color: var(--h-on-gold); }
.xl-ptable { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 5px; padding: 10px; border-radius: 14px; background: rgba(255,255,255,.02); }
.xl-ptable[hidden], .xl-elinfo[hidden] { display: none; }
.xl-ptable-head { order: -1; grid-column: 1 / -1; display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 5px; font: 600 .66rem/1 var(--h-sans); letter-spacing: .08em; color: var(--h-muted); text-align: center; }
.xl-el { position: relative; display: grid; place-items: center; gap: 1px; min-height: 48px; padding: 4px 2px; border: 1px solid var(--h-line); border-radius: 10px; background: var(--h-panel-2); color: var(--h-text); cursor: pointer; transition: border-color .2s, background-color .2s, transform .2s; }
.xl-el:hover:not(:disabled) { border-color: rgba(242,191,94,.55); transform: translateY(-1px); }
.xl-el-s { font: 700 1rem/1 var(--h-sans); }
.xl-el-q { font: 600 .66rem/1 var(--h-sans); color: var(--h-muted); }
.xl-el.g1 .xl-el-s, .xl-el.g2 .xl-el-s, .xl-el.g13 .xl-el-s { color: #F2BF5E; }
.xl-el.g15 .xl-el-s, .xl-el.g16 .xl-el-s, .xl-el.g17 .xl-el-s { color: #7ED3A2; }
.xl-el.is-none { opacity: .5; }
.xl-el.is-none .xl-el-s { color: var(--h-text-2); }
.xl-el:disabled { cursor: default; opacity: .4; }
.xl-el.is-cat { border-color: #F2BF5E; background: rgba(242,191,94,.16); opacity: 1; }
.xl-el.is-an { border-color: #7ED3A2; background: rgba(126,211,162,.14); opacity: 1; }
.xl-el.is-want { border-color: var(--h-gold-1); animation: xl-glow 2.4s ease-in-out infinite; }
.xl-elinfo { margin: 0; min-height: 1.5em; font-size: .92rem; line-height: 1.5; color: var(--h-text-2); }
.xl-elinfo b { color: var(--h-text); }
.xl[data-focus="table"] .xl-ptable { box-shadow: 0 0 0 1px rgba(242,191,94,.45); animation: xl-glow 3.2s ease-in-out infinite; }
.xl-check .xl-btn.is-pointer { opacity: 1; background: rgba(242,191,94,.12); color: var(--h-gold-1); border: 1px dashed rgba(242,191,94,.55); box-shadow: none; cursor: default; }
.xl-ionbuild { display: grid; gap: 12px; }
.xl-ionsrc { display: flex; flex-wrap: wrap; gap: 10px; }
.xl-ion { display: inline-grid; place-items: center; gap: 2px; width: 64px; height: 64px; border-radius: 50%; border: 1.5px solid; background: none; cursor: grab; touch-action: none; user-select: none; transition: transform .15s; }
.xl-ion b { font: 700 1rem/1 var(--h-sans); }
.xl-ion span { font: 600 .62rem/1 var(--h-sans); letter-spacing: .06em; text-transform: uppercase; opacity: .8; }
.xl-ion.is-cat { border-color: #F2BF5E; color: #F2BF5E; background: rgba(242,191,94,.1); }
.xl-ion.is-an { border-color: #7ED3A2; color: #7ED3A2; background: rgba(126,211,162,.1); }
.xl-ion:hover { transform: scale(1.05); }
.xl-ion.is-in { width: 52px; height: 52px; cursor: pointer; animation: xl-in .25s cubic-bezier(.25,1,.5,1); }
.xl-ion.is-ghost { box-shadow: 0 10px 30px rgba(0,0,0,.5); opacity: .92; }
.xl-tray { display: flex; flex-wrap: wrap; align-content: center; justify-content: center; gap: 8px; min-height: 92px; padding: 12px; border: 1.5px dashed var(--h-line-2); border-radius: 14px; background: rgba(0,0,0,.18); transition: border-color .2s, background-color .2s; }
.xl-tray.is-over { border-color: var(--h-gold-1); background: rgba(242,191,94,.08); }
.xl-tray-empty { margin: 0; color: var(--h-muted) !important; font-size: .9rem; }
.xl-meter { display: grid; gap: 6px; }
.xl-meter > div { display: grid; grid-template-columns: 5.5em minmax(0, 1fr) 3em; align-items: center; gap: 10px; font-size: .84rem; color: var(--h-text-2); }
.xl-meter > div::before { content: none; }
.xl-meter i { display: block; height: 10px; border-radius: 6px; transition: width .4s cubic-bezier(.25,1,.5,1); }
.xl-meter > div { position: relative; }
.xl-meter i.is-pos { background: #F2BF5E; }
.xl-meter i.is-neg { background: #7ED3A2; }
.xl-meter b { color: var(--h-text); font-variant-numeric: tabular-nums; text-align: right; }
.xl-net { margin: 0; font-size: .95rem; color: var(--h-text-2) !important; }
.xl-net b { color: #F0846E; }
.xl-net.is-zero b { color: var(--h-good); }
.xl-small-b { font-size: clamp(1.1rem, 3.4vw, 1.5rem) !important; }
@media (prefers-reduced-motion: reduce) { .xl-el.is-want, .xl[data-focus="table"] .xl-ptable { animation: none; } }

/* ---------- 1.2: spectrum and the identify strip ---------- */
.xl-spectrum { display: grid; gap: 4px; padding: 10px 12px 8px; border-radius: 14px; border: 1px solid var(--h-line); background: rgba(0,0,0,.22); animation: xl-in .35s cubic-bezier(.25,1,.5,1); }
.xl-spectrum[hidden] { display: none; }
.xl-ms { width: 100%; height: auto; }
.xl-ms-axis { stroke: rgba(237,230,216,.35); stroke-width: 1; }
.xl-ms-t { fill: var(--h-muted); font: 500 10px var(--h-sans); }
.xl-ms-t.is-peak { fill: var(--h-text); font-weight: 700; }
.xl-ms-l { fill: var(--h-muted); font: 500 10px var(--h-sans); }
.xl-ms-peak { stroke: var(--h-gold-2); stroke-width: 6; stroke-linecap: round; }
.xl-ms-v { fill: var(--h-gold-1); font: 700 11px var(--h-sans); }
.xl-ptstrip { display: grid; grid-template-columns: repeat(auto-fill, minmax(58px, 1fr)); gap: 5px; }
.xl-pt { display: grid; gap: 2px; min-height: 50px; padding: 6px 2px; border: 1px solid var(--h-line); border-radius: 10px; background: var(--h-panel-2); color: var(--h-text); cursor: pointer; transition: border-color .2s, background-color .2s, transform .2s; }
.xl-pt b { font: 700 1rem/1 var(--h-sans); }
.xl-pt span { font: 500 .66rem/1 var(--h-sans); color: var(--h-muted); font-variant-numeric: tabular-nums; }
.xl-pt:hover:not(:disabled) { border-color: rgba(242,191,94,.55); transform: translateY(-1px); }
.xl-pt.is-picked { border-color: var(--h-gold-1); background: rgba(242,191,94,.14); }
.xl-pt.is-answer { border-color: var(--h-good); box-shadow: 0 0 0 1px var(--h-good); }
.xl-pt:disabled { cursor: default; opacity: .55; }
.xl-pt.is-answer:disabled, .xl-pt.is-picked:disabled { opacity: 1; }

/* ---------- 1.6: element row, sketch pad, comparison list ---------- */
.xl-elrow { display: grid; grid-template-columns: repeat(auto-fill, minmax(46px, 1fr)); gap: 4px; }
.xl-elrow[hidden] { display: none; }
.xl-elrow .xl-pt { min-height: 42px; padding: 4px 0; }
.xl-elrow .xl-pt b { font-size: .9rem; }
.xl-pad { fill: rgba(242,191,94,.03); stroke: rgba(242,191,94,.35); stroke-dasharray: 4 4; cursor: crosshair; }
.xl-pad:hover { fill: rgba(242,191,94,.07); }
.xl-ms-peak.is-real, .xl-ms-peak.is-ghost { stroke: rgba(126,211,162,.9); stroke-width: 6; }
.xl-ms-peak.is-ghost { stroke: rgba(126,211,162,.45); stroke-dasharray: 3 3; }
.xl-pes-ref { stroke: rgba(237,230,216,.22); stroke-width: 6; stroke-linecap: round; }
.xl-pes-ref-t { fill: rgba(237,230,216,.4); font: 500 9px var(--h-sans); }
.xl-sk { cursor: pointer; }
.xl-sk-peak { stroke: var(--h-gold-2); stroke-width: 6; stroke-linecap: round; }
.xl-sk-top { fill: var(--h-gold-1); stroke: #0E0C0A; stroke-width: 2; }
.xl-sk.is-sel .xl-sk-peak { stroke: var(--h-gold-1); }
.xl-sk.is-sel .xl-sk-top { r: 9; stroke: var(--h-gold-1); fill: #0E0C0A; }
.xl-sketch-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding-top: 4px; }
.xl-sketch-tools[hidden] { display: none; }
.xl-sketch-tools .xl-btn { min-height: 38px; padding: 0 14px; font-size: .84rem !important; }
.xl-cmp { display: grid; gap: 6px; margin: 0; padding: 0; list-style: none; font-size: .9rem; line-height: 1.45; }
.xl-cmp li { display: flex; gap: 8px; align-items: flex-start; padding: 8px 10px; border-radius: 10px; background: rgba(255,255,255,.04); color: var(--h-text-2); }
.xl-cmp li svg { flex: none; width: 16px; height: 16px; color: var(--h-good); margin-top: 2px; }
.xl-cmp li.is-off { box-shadow: inset 3px 0 0 var(--h-gold-2); }
.xl-spectrum .xl-sk-peak { opacity: .9; }
.xl-ms-peak.is-real { opacity: .95; }

/* ---------- 1.5: orbital boxes ---------- */
.xl-elrow.is-36 { grid-template-columns: repeat(auto-fill, minmax(42px, 1fr)); }
.xl-ionpick { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.xl-ionpick[hidden] { display: none; }
.xl-ionpick .xl-btn { min-height: 36px; padding: 0 12px; font-size: .82rem !important; }
.xl-ionpick .xl-btn[aria-pressed="true"] { border-color: var(--h-gold-1); background: rgba(242,191,94,.14); color: var(--h-gold-1); }
.xl-orbitals { display: grid; gap: 10px; padding: 14px 16px; border-radius: 14px; border: 1px solid var(--h-line); background: radial-gradient(80% 90% at 50% 100%, color-mix(in srgb, var(--unit) 8%, transparent), transparent 70%), #0E0C0A; }
.xl-orbitals > .xl-hint { margin: 0; }
.xl-orb-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 14px; font-size: .92rem; color: var(--h-text-2); }
.xl-orb-head b { color: var(--h-text); }
.xl-orb-count b { color: var(--h-gold-1); font-variant-numeric: tabular-nums; }
.xl-orb-rows { display: grid; gap: 6px; }
.xl-orb-row { display: grid; grid-template-columns: 2.4em minmax(0, 1fr) 3.6em; align-items: center; gap: 10px; }
.xl-orb-row.is-empty { opacity: .75; }
.xl-orb-k { font: 600 .88rem/1 var(--h-sans); color: var(--h-text-2); text-align: right; }
.xl-orb-n { font: 600 .84rem/1 var(--h-sans); color: var(--h-gold-1); }
.xl-orb-boxes { display: flex; gap: 4px; }
.xl-orb { position: relative; display: flex; justify-content: center; align-items: center; gap: 6px; width: 46px; height: 36px; padding: 0; border: 1.5px solid rgba(237,230,216,.45); border-radius: 6px; background: rgba(255,255,255,.03); cursor: pointer; transition: border-color .15s, background-color .15s, transform .15s; }
.xl-orb:hover:not(:disabled) { border-color: var(--h-gold-1); background: rgba(242,191,94,.08); }
.xl-orb:disabled { cursor: default; }
.xl-orb.is-flash { border-color: #F0846E; background: rgba(240,132,110,.14); animation: xl-settle .35s ease; }
.xl-e { display: block; width: 3px; height: 22px; border-radius: 2px; background: var(--h-gold-1); position: relative; }
.xl-e::before { content: ''; position: absolute; left: 50%; width: 9px; height: 9px; border-left: 2.5px solid var(--h-gold-1); border-top: 2.5px solid var(--h-gold-1); transform: translateX(-50%) rotate(45deg); }
.xl-e.is-up::before { top: -1px; }
.xl-e.is-dn { background: #7FB2F0; }
.xl-e.is-dn::before { bottom: -1px; border-color: #7FB2F0; transform: translateX(-50%) rotate(225deg); }
@media (max-width: 520px) { .xl-orb { width: 38px; height: 32px; } .xl-orb-row { grid-template-columns: 2.2em minmax(0, 1fr) 3em; gap: 6px; } }
.xl-steps[data-n="2"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.xl-steps[data-n="5"] { grid-template-columns: repeat(5, minmax(0, 1fr)); }
@container (max-width: 700px) { .xl-steps[data-n="5"] { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; } .xl-steps[data-n="2"] { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; } }

/* ---------- 1.7: heat map and comparison cards ---------- */
.xl-trendpick { width: 100%; }
.xl-trendpick button { flex: 1; min-width: max-content; }
.xl-trend-desc { margin: 0; min-height: 1.4em; }
.xl-ptable.is-heat .xl-el { transition: background-color .4s, border-color .2s, transform .2s; }
.xl-ptable.is-heat .xl-el-s { color: var(--h-text); }
.xl-ptable.is-heat .xl-el-q { color: var(--h-text-2); font-variant-numeric: tabular-nums; }
.xl-ptable.is-heat .xl-el:disabled { opacity: 1; cursor: default; }
.xl-el.is-gap { visibility: hidden; }
.xl-cmp-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.xl-cmp-cards:empty { display: none; }
.xl-cmp-card { display: grid; gap: 8px; padding: 12px 14px; border: 1px solid var(--h-line); border-radius: 14px; background: var(--h-panel-2); animation: xl-in .3s cubic-bezier(.25,1,.5,1); }
.xl-cmp-card.is-empty { place-items: center; color: var(--h-muted); border-style: dashed; }
.xl-cmp-card.is-empty p { margin: 0; }
.xl-cmp-sym { margin: 0; display: flex; align-items: baseline; gap: 8px; font: 700 1.5rem/1 var(--h-display) !important; color: var(--h-gold-1) !important; }
.xl-cmp-sym span { font: 500 .84rem/1 var(--h-sans); color: var(--h-text-2); }
.xl-cmp-val { margin: 0; font: 700 1.4rem/1 var(--h-sans) !important; color: var(--h-text) !important; font-variant-numeric: tabular-nums; }
.xl-cmp-val small { font-size: .7rem; color: var(--h-muted); font-weight: 500; }
.xl-cmp-card dl { display: grid; gap: 4px; margin: 0; }
.xl-cmp-card dl div { display: flex; justify-content: space-between; gap: 8px; font-size: .84rem; }
.xl-cmp-card dt { color: var(--h-muted); }
.xl-cmp-card dd { margin: 0; color: var(--h-text); font-weight: 600; font-variant-numeric: tabular-nums; }
.xl-choice.is-picked { border-color: var(--h-gold-1); background: rgba(242,191,94,.12); }
@media (max-width: 480px) { .xl-cmp-cards { grid-template-columns: 1fr; } }
.xl-trendpick { flex-wrap: wrap; }
.xl-trendpick button { min-width: 0; white-space: nowrap; }

/* ---------- 1.3: element mass bars and percent-composition bars ---------- */
.xl-massbars { display: grid; gap: 6px; padding: 12px 14px; border-radius: 14px; border: 1px solid var(--h-line); background: rgba(0,0,0,.22); animation: xl-in .35s cubic-bezier(.25,1,.5,1); }
.xl-massbars[hidden] { display: none; }
.xl-massbars .xl-view-k { padding: 0 0 4px; }
.xl-massbar { display: grid; grid-template-columns: 2.2em minmax(0, 1fr) 5em; align-items: center; gap: 10px; font-size: .88rem; }
.xl-mb-e { font: 700 .95rem/1 var(--h-sans); }
.xl-mb-track { height: 12px; border-radius: 6px; background: rgba(255,255,255,.06); overflow: hidden; }
.xl-mb-track i { display: block; height: 100%; border-radius: 6px; transition: width .25s linear; }
.xl-massbar b { color: var(--h-text); font-variant-numeric: tabular-nums; text-align: right; }
.xl-pctbars { display: grid; gap: 10px; }
.xl-pctbar { display: grid; gap: 4px; font-size: .84rem; color: var(--h-text-2); }
.xl-pct-track { display: flex; height: 26px; border-radius: 8px; overflow: hidden; background: rgba(255,255,255,.06); }
.xl-pct-track i { display: grid; place-items: center; min-width: 0; height: 100%; overflow: hidden; }
.xl-pct-track b { font: 600 .72rem/1 var(--h-sans); color: #0B0A09; white-space: nowrap; }

/* ---------- Unit 2 models and benches (ced-topic2N-explore.js) ---------- */
.x22-plot { margin: 4px 0 8px; }
.x22-svg { min-width: 0; }
.x22-ctl label { display: grid; gap: 6px; font: 600 .86rem/1.3 var(--h-sans); color: var(--h-text-2); }
.x22-ctl output { color: var(--h-gold-1); }
.x22-slider { width: 100%; accent-color: var(--h-gold-1); }
.x23-stage { display: grid; gap: 10px; }
.x23-lattice { display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; max-width: 360px; margin: 0 auto; padding: 8px; border: 1px dashed rgba(93,173,226,.35); border-radius: 12px; background: rgba(93,173,226,.05); transition: background .4s; }
.x23-lattice.is-melt { background: rgba(242,191,94,.08); border-color: rgba(242,191,94,.45); }
.x23-site { display: grid; place-items: center; aspect-ratio: 1; min-height: 44px; padding: 0; border: 1px solid rgba(255,255,255,.08); border-radius: 10px; background: rgba(255,255,255,.03); cursor: pointer; transition: transform .25s; }
.x23-site:disabled { cursor: default; }
.x23-site span { display: grid; place-items: center; border-radius: 50%; font: 700 .72rem/1 var(--h-sans); color: var(--h-text); transition: width .2s, height .2s; }
.x23-site.is-cat span { background: rgba(93,173,226,.28); box-shadow: inset 0 0 0 1.5px #5DADE2; }
.x23-site.is-an span { background: rgba(231,76,60,.2); box-shadow: inset 0 0 0 1.5px #E57373; }
.x23-site.is-pushed { transform: translateX(6px); }
.x23-lattice.is-melt .x23-site span { animation: x23-jiggle 1.6s ease-in-out infinite alternate; }
.x23-lattice.is-melt .x23-site:nth-child(2n) span { animation-delay: -.6s; } .x23-lattice.is-melt .x23-site:nth-child(3n) span { animation-delay: -1.1s; }
@keyframes x23-jiggle { from { transform: translate(-3px, 2px); } to { transform: translate(3px, -2px); } }
.x23-meter { display: flex; flex-wrap: wrap; gap: 8px 14px; font: 500 .86rem/1.3 var(--h-sans); color: var(--h-text-2); }
.x23-m b { color: var(--h-text); } .x23-m.att b { color: var(--h-gold-1); } .x23-m.rep b { color: #F0846E; }
.x23-on { color: var(--h-gold-1); } .x23-off { color: var(--h-muted); }
.x24-pick { display: grid; gap: 10px; }
.x24-amount { display: grid; gap: 6px; font: 600 .86rem/1.3 var(--h-sans); color: var(--h-text-2); }
.x24-amount output { color: var(--h-gold-1); }
.x24-slider { width: 100%; accent-color: var(--h-gold-1); }
.x24-svg { min-width: 0; }
.x24-block { margin: 4px 0; }
@media (prefers-reduced-motion: reduce) { .x23-lattice.is-melt .x23-site span { animation: none; } }
/* benches 2.5–2.7 */
.x25-stage, .x26-stage, .x27-stage { display: grid; gap: 10px; }
.x25-draw, .x27-draw { max-width: 360px; margin: 0 auto; width: 100%; }
.x25-draw .lw-svg, .x26-draw .lw-svg { max-height: 240px; }
.x25-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin: 2px 0; }
.x25-k { font: 600 .72rem/1.2 var(--h-sans); letter-spacing: .14em; text-transform: uppercase; color: var(--h-text-2); min-width: 86px; }
.x25-ctl { display: inline-flex; align-items: center; gap: 4px; padding: 4px 6px 4px 10px; border: 1px solid var(--h-line); border-radius: var(--h-pill); background: var(--h-panel); font: 500 .84rem/1 var(--h-sans); color: var(--h-text-2); }
.x25-ctl > span { margin-right: 4px; color: var(--h-text); }
.x25-ctl b { min-width: 3.2em; text-align: center; color: var(--h-gold-1); font-weight: 700; }
.x25-ctl button { width: 30px; height: 30px; border: 1px solid var(--h-line); border-radius: 50%; background: rgba(255,255,255,.04); color: var(--h-text); font: 700 1rem/1 var(--h-sans); cursor: pointer; }
.x25-ctl button:disabled { opacity: .35; cursor: default; }
.x25-issues { margin: 6px 0 0; padding-left: 18px; }
.x25-issues li { margin: 4px 0; }
.x26-work { display: grid; gap: 8px; max-width: 360px; margin: 0 auto; width: 100%; }
.x26-forms { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.x26-mini { width: 150px; }
.x26-mini .lw-svg { max-height: 100px; }
.x26-fcgrid { display: grid; gap: 8px; margin: 6px 0; }
.x26-fcrow { display: grid; grid-template-columns: 1fr auto; gap: 8px 12px; align-items: center; padding: 8px 12px; border: 1px solid var(--h-line); border-radius: 12px; background: var(--h-panel); font: 500 .88rem/1.4 var(--h-sans); color: var(--h-text-2); }
.x26-fcrow.is-ok { border-color: color-mix(in srgb, var(--h-good) 55%, var(--h-line)); }
.x26-fcrow.is-bad { border-color: rgba(240,132,110,.6); }
.x26-fcrow .xl-cin-row { margin: 0; }
.x26-fcrow .xl-cin { width: 5em; }
.x27-none { text-align: center; padding: 30px 10px; }
.x27-geo .xl-choice { min-height: 40px; }
@media (max-width: 700px) { .x26-fcrow { grid-template-columns: 1fr; } }

/* shaded-sphere particles, matching the MolArt style of the Learn figures (cation blue, anion red) */
.x23-site.is-cat span { background: radial-gradient(circle at 36% 30%, #dbe8ff 0, #3C78E6 42%, #1d3f80 82%, #10234a 100%); box-shadow: 0 0 0 1px rgba(0,0,0,.45); color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,.6); }
.x23-site.is-an span { background: radial-gradient(circle at 36% 30%, #ffd9d2 0, #E8452F 42%, #8a2416 82%, #4a120a 100%); box-shadow: 0 0 0 1px rgba(0,0,0,.45); color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,.6); }