.neut-page {
    --neut-muted: var(--color-text-muted);
    --neut-border: var(--color-border);
    --neut-green: #9ad9b0;
    --neut-red: #f19b9b;
    --neut-soft: rgba(238, 172, 96, 0.055);
    padding-top: 12px;
    line-height: 1.6;
}
.neut-page [hidden] { display: none !important; }
.neut-page :is(button, input, select) { font: inherit; }
.neut-page :is(button, a, select, input, summary) { touch-action: manipulation; }
.neut-page :focus-visible { outline: 3px solid var(--color-accent); outline-offset: 4px; }
.neut-page :is(h1, h2, h3) { color: var(--color-text); line-height: 1.2; }
.neut-page h2 { margin: 0; font-size: clamp(1.3rem, 2.4vw, 1.8rem); letter-spacing: -0.025em; }
.neut-page p { color: var(--neut-muted); }
.neut-page a { text-underline-offset: 3px; }
.neut-eyebrow { margin: 0 0 9px; color: var(--color-accent) !important; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.13em; }
.neut-hero { display: flex; justify-content: space-between; align-items: center; gap: 30px; padding: 15px 0 30px; }
.neut-hero h1 { margin: 12px 0 18px; font-size: clamp(2.2rem, 4.5vw, 3.8rem); letter-spacing: -0.045em; }
.neut-hero h1 span { color: var(--color-accent); }
.neut-hero > div > p:last-child { max-width: 630px; margin: 0; }
.neut-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.neut-hero > .neut-actions { flex-shrink: 0; }
.neut-button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-height: 44px; padding: 10px 16px; border: 1px solid var(--neut-border); border-radius: 9px; background: var(--neut-soft); color: var(--color-text); font-size: 0.82rem !important; font-weight: 700 !important; text-decoration: none; cursor: pointer; }
.neut-button:hover { border-color: var(--color-accent); background: rgba(238, 172, 96, 0.14); }
.neut-primary { color: #241508; background: var(--color-accent); border-color: var(--color-accent); }
.neut-primary:hover { background: #ffd09a; }
.neut-button:disabled { cursor: default; opacity: 0.5; }
.neut-text-button { min-height: 44px; padding: 6px 0; border: 0; background: transparent; color: var(--color-accent); font-size: 0.78rem !important; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.neut-principle { padding: 21px 25px; border: 1px solid var(--neut-border); border-left: 3px solid var(--color-accent); border-radius: 12px; background: var(--neut-soft); }
.neut-principle .neut-word-equation { margin: 0 0 4px; color: var(--color-text); font-size: clamp(1.05rem, 2vw, 1.4rem); }
.neut-word-equation strong { color: var(--neut-green); }
.neut-principle > p:last-child { margin: 0; font-size: 0.8rem; }
.neut-section { margin-top: 34px; }
.neut-page :is(section[id], article[id]) { scroll-margin-top: calc(var(--site-top-height, 64px) + 24px); }
.neut-panel { min-width: 0; padding: clamp(18px, 2.6vw, 30px); border: 1px solid var(--neut-border); border-radius: 16px; background: var(--color-bg-panel); box-shadow: var(--card-shadow); }
.neut-section-heading { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 18px; margin-bottom: 20px; }
.neut-section-heading .neut-eyebrow { margin-bottom: 7px; }
.neut-intro { max-width: 850px; margin: 0 0 24px; font-size: 0.9rem; }
.neut-lab-layout { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(240px, 0.75fr); border: 1px solid var(--neut-border); border-radius: 12px; overflow: hidden; }
.neut-lab-controls { min-width: 0; padding: 25px; }
.neut-field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.neut-page label { display: block; font-size: 0.8rem; font-weight: 700; }
.neut-page select { display: block; width: 100%; min-height: 44px; margin-top: 9px; padding: 9px 10px; border: 1px solid var(--neut-border); border-radius: 7px; background: var(--color-bg-card); color: var(--color-text); font-size: 0.82rem; }
.neut-volume-label { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-top: 29px; }
.neut-volume-label output { color: var(--color-accent); font-size: 1.35rem; font-variant-numeric: tabular-nums; font-weight: 700; }
.neut-range { width: 100%; height: 30px; margin: 12px 0 0; accent-color: var(--color-accent); cursor: pointer; }
.neut-small { font-size: 0.73rem; color: var(--neut-muted); }
#neutVolumeHelp { margin: 0 0 14px; }
.neut-dose-actions { gap: 8px; }
.neut-meter { margin: 27px 0 20px; }
.neut-ph-track { position: relative; height: 9px; border-radius: 10px; background: linear-gradient(to right, #e85c62, #f3a255 22%, #e6d56a 36%, #74bf81 50%, #69b9bd 64%, #688cda 80%, #9c73c2); }
.neut-ph-marker { position: absolute; top: -6px; left: 7.1429%; width: 6px; height: 21px; border: 2px solid var(--color-text); border-radius: 3px; background: var(--color-bg-dark); transform: translateX(-50%); }
.neut-ph-labels { display: flex; justify-content: space-between; margin-top: 9px; color: var(--neut-muted); font-size: 0.68rem; }
.neut-status { min-height: 78px; padding: 13px 15px; border: 1px solid var(--neut-border); border-left: 3px solid var(--color-accent); border-radius: 8px; background: var(--neut-soft); font-size: 0.83rem; }
.neut-lab-visual { display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 20px; border-left: 1px solid var(--neut-border); background: radial-gradient(ellipse at 50% 55%, rgba(104, 163, 161, 0.08), transparent 70%); text-align: center; }
.neut-apparatus { position: relative; width: 210px; height: 260px; }
.neut-burette { position: absolute; top: 0; left: 95px; width: 22px; height: 100px; border: 2px solid #a5b8bd; border-top: 0; background: repeating-linear-gradient(to bottom, transparent 0 11px, #829ca5 11px 12px, transparent 12px 13px) right 3px top / 7px 100% no-repeat; }
.neut-burette > span { position: absolute; inset: 19px 2px 2px; background: rgba(141, 190, 210, 0.2); border-top: 1px solid #93bacb; }
.neut-burette-label { position: absolute; top: 22px; left: 131px; font-size: 0.78rem; color: var(--neut-muted); }
.neut-tap { position: absolute; left: 88px; top: 99px; width: 36px; height: 5px; border-radius: 2px; background: var(--color-accent); }
.neut-tap::after { position: absolute; top: 5px; left: 15px; width: 5px; height: 12px; background: #a5b8bd; content: ''; }
.neut-drops { position: absolute; inset: 0; z-index: 2; pointer-events: none; }
.neut-drop { position: absolute; top: 116px; left: 102px; width: 8px; height: 11px; border-radius: 2px 70% 65% 70%; background: #85c7da; box-shadow: inset -2px -2px 2px rgba(57, 122, 148, 0.25); will-change: transform; }
.neut-apparatus.is-pouring .neut-tap { box-shadow: 0 0 8px rgba(238, 172, 96, 0.4); }
.neut-beaker { position: absolute; left: 40px; bottom: 10px; width: 132px; height: 112px; overflow: hidden; border: 2px solid #a5b8bd; border-top-width: 4px; border-radius: 0 0 18px 18px; background: linear-gradient(100deg, rgba(255, 255, 255, 0.07), transparent 40%); }
.neut-liquid { position: absolute; inset: auto 3px 3px; height: 52%; border-top: 2px solid var(--neut-liquid-color, #e85c62); border-radius: 0 0 13px 13px; background: var(--neut-liquid-color, #e85c62); opacity: 0.55; transition: background 180ms, height 180ms; }
.neut-ripple { position: absolute; top: -4px; left: 50%; width: 15px; height: 7px; border: 2px solid #e1f5fa; border-radius: 50%; pointer-events: none; animation: neut-ripple 550ms ease-out forwards; }
.neut-graduations { position: absolute; top: 15px; right: 12px; width: 15px; height: 72px; background: repeating-linear-gradient(to bottom, #a5b8bd 0 1px, transparent 1px 18px); }
.neut-beaker > span { position: absolute; top: 63px; left: 10px; font-size: 0.7rem; font-weight: 700; color: var(--color-text); }
.neut-bench { position: absolute; bottom: 7px; left: 8px; right: 8px; height: 3px; border-radius: 5px; background: var(--neut-border); }
.neut-ph-reading { display: flex; align-items: baseline; justify-content: center; gap: 10px; margin-top: 9px; }
.neut-ph-reading > span { color: var(--neut-muted); font-size: 0.8rem; }
.neut-ph-reading output { font-size: 2.6rem; font-weight: 700; letter-spacing: -0.04em; font-variant-numeric: tabular-nums; }
.neut-ph-reading strong { color: var(--color-accent); font-size: 0.8rem; }
.neut-lab-visual > p { max-width: 220px; margin: 2px 0 0; }
.neut-readings { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 18px 0 22px; }
.neut-readings > div { padding: 14px 16px; border: 1px solid var(--neut-border); border-radius: 9px; background: var(--neut-soft); }
.neut-readings dt { color: var(--neut-muted); font-size: 0.7rem; }
.neut-readings dd { margin: 4px 0 0; font-size: 1.35rem; font-variant-numeric: tabular-nums; }
.neut-readings dd > span { color: var(--neut-muted); font-size: 0.72rem; }
.neut-readings > div:last-child dd { color: var(--neut-green); }
.neut-calculation { padding-top: 18px; border-top: 1px solid var(--neut-border); }
.neut-calculation summary { cursor: pointer; font-size: 0.85rem; font-weight: 700; }
.neut-calculation p { font-size: 0.85rem; overflow-wrap: anywhere; }
.neut-calculation .neut-formula { color: var(--color-text); }
.neut-calculation .neut-small { font-size: 0.73rem; }
.neut-reaction-layout { display: grid; grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1.5fr); gap: 18px; }
.neut-reactant-controls label + label { margin-top: 20px; }
.neut-reactant-controls > p { margin-bottom: 0; line-height: 1.9; }
.neut-reaction-result { border-top: 2px solid var(--neut-green); }
.neut-reaction-result h3 { margin: 4px 0 5px; font-size: 1.6rem; }
.neut-salt-formula { margin: 0 0 20px; color: var(--neut-green) !important; font-size: 1.5rem; }
.neut-equation { margin: 0; padding: 16px 18px; border: 1px solid var(--neut-border); border-radius: 8px; background: var(--neut-soft); color: var(--color-text) !important; font-size: 1rem; overflow-wrap: anywhere; }
#neutWordEquation, .neut-reaction-note { font-size: 0.83rem; }
.neut-reaction-note { padding-top: 14px; border-top: 1px solid var(--neut-border); }
.neut-text-link { color: var(--color-accent); font-size: 0.8rem; }
.neut-method-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.neut-method-tag { font-size: 0.65rem; letter-spacing: 0.08em; color: var(--color-accent); }
.neut-method h3 { margin: 12px 0 14px; font-size: 1.3rem; }
.neut-method p, .neut-method li { font-size: 0.84rem; color: var(--neut-muted); }
.neut-method ol { margin: 23px 0 0; padding-left: 0; list-style: none; counter-reset: neut-preparation; }
.neut-method li { position: relative; padding-left: 28px; counter-increment: neut-preparation; }
.neut-method li + li { margin-top: 16px; }
.neut-method li::before { position: absolute; top: 10px; left: 0; display: grid; place-items: center; width: 22px; height: 22px; border: 1px solid var(--neut-border); border-radius: 6px; color: var(--color-accent); font-size: 0.73rem; font-weight: 700; content: counter(neut-preparation); }
.neut-method strong { color: var(--color-text); }
.neut-method { container-type: inline-size; --neut-glass: #b3c9d1; --neut-paper: #302c27; --neut-crystal: #f2e8d7; --neut-crystal-edge: #a49a88; }
.neut-diagram-definitions { position: absolute; overflow: hidden; pointer-events: none; }
.neut-method-step { display: grid; grid-template-columns: 165px minmax(0, 1fr); align-items: center; gap: 18px; }
.neut-method-step-copy { min-width: 0; }
.neut-method-graphic { margin: 0; padding: 9px 6px 10px; border: 1px solid var(--neut-border); border-radius: 11px; background: var(--neut-soft); }
.neut-method-graphic svg { display: block; width: 100%; height: auto; overflow: visible; stroke-linecap: round; stroke-linejoin: round; }
.neut-method-graphic figcaption { padding: 6px 4px 0; color: var(--neut-muted); font-size: 0.68rem; line-height: 1.4; text-align: center; }
.neut-diagram-glass { fill: none; stroke: var(--neut-glass); stroke-width: 2; }
.neut-diagram-water { fill: #b7ced5; fill-opacity: 0.2; stroke: #9ab6bf; stroke-width: 1; }
.neut-diagram-copper-solution { fill: #63b5da; fill-opacity: 0.55; stroke: #72b6cc; stroke-width: 1; }
.neut-diagram-stand { fill: none; stroke: var(--neut-glass); stroke-width: 3; }
.neut-diagram-accent { fill: none; stroke: var(--color-accent); stroke-width: 2; }
.neut-diagram-indicator { fill: #d496bb; fill-opacity: 0.65; }
.neut-diagram-leader { fill: none; stroke: var(--neut-muted); stroke-opacity: 0.65; stroke-width: 1; }
.neut-diagram-label { fill: var(--neut-muted); font-family: Arial, sans-serif; font-size: 11px; }
.neut-diagram-steam { fill: none; stroke: var(--neut-glass); stroke-width: 1.6; stroke-opacity: 0.7; }
.neut-diagram-paper { fill: var(--neut-paper); stroke: var(--neut-glass); stroke-width: 1.2; }
.neut-diagram-crystal { fill: var(--neut-crystal); stroke: var(--neut-crystal-edge); stroke-width: 1.4; }
.neut-diagram-crystal-edge { fill: none; stroke: var(--neut-crystal-edge); stroke-width: 1; }
.neut-diagram-copper { fill: #48a5d0; stroke: #6dc5eb; stroke-width: 1.4; }
.neut-diagram-copper-edge { fill: none; stroke: #b5ecff; stroke-width: 1.2; }
.neut-diagram-solid { fill: #343b40; stroke: #82939b; stroke-width: 1.2; }
.neut-diagram-tool { fill: var(--neut-glass); stroke: var(--neut-glass); stroke-width: 1; }
.neut-diagram-heater { fill: var(--neut-paper); stroke: var(--neut-glass); stroke-width: 1.5; }
@container (max-width: 360px) {
    .neut-method-step { grid-template-columns: 1fr; gap: 14px; }
    .neut-method-graphic { width: 100%; max-width: 230px; justify-self: center; }
}
:root[data-theme="light"] .neut-method { --neut-glass: #607d87; --neut-paper: #fffdf8; --neut-crystal: #fffdf2; --neut-crystal-edge: #998b72; }
.neut-takeaway { padding: 20px 23px; margin-top: 20px; border-left: 3px solid var(--neut-green); border-radius: 0 10px 10px 0; background: var(--neut-soft); font-size: 0.87rem; }
.neut-takeaway p { margin: 8px 0 0; }
.neut-takeaway a { color: var(--color-accent); }
.neut-question { min-width: 0; margin: 0 0 24px; padding: 0 0 24px; border: 0; border-bottom: 1px solid var(--neut-border); }
.neut-question legend { margin-bottom: 14px; padding: 0; font-size: 0.94rem; font-weight: 700; }
.neut-question-number { margin-right: 9px; color: var(--color-accent); font-size: 0.78rem; }
.neut-answer-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.neut-page .neut-answer { display: flex; align-items: flex-start; gap: 10px; min-height: 48px; padding: 12px 14px; border: 1px solid var(--neut-border); border-radius: 8px; color: var(--neut-muted); background: var(--neut-soft); font-size: 0.82rem; font-weight: 400; cursor: pointer; }
.neut-answer input { flex-shrink: 0; margin: 4px 0 0; accent-color: var(--color-accent); }
.neut-answer:has(input:checked), .neut-answer:hover { border-color: var(--color-accent); }
.neut-page .neut-answer.is-correct { border-color: var(--neut-green); background: rgba(115, 181, 137, 0.1); }
.neut-page .neut-answer.is-incorrect { border-color: var(--neut-red); background: rgba(211, 100, 100, 0.08); }
.neut-answer:has(input:disabled) { cursor: default; }
.neut-answer-state { display: block; margin-top: 5px; font-size: 0.72rem; color: var(--neut-green); font-weight: 700; }
.is-incorrect .neut-answer-state { color: var(--neut-red); }
.neut-feedback { margin: 12px 0 0; font-size: 0.83rem; }
.neut-feedback.is-correct { color: var(--neut-green); }
.neut-feedback.is-incorrect { color: var(--neut-red); }
.neut-quiz-result { margin-top: 20px; padding: 18px; border: 1px solid var(--color-accent); border-radius: 10px; background: var(--neut-soft); }
.neut-footer { margin-top: 30px; text-align: center; font-size: 0.74rem; }
.neut-footer a { color: var(--color-accent); }
.neut-footer span { padding: 0 8px; }
.neut-footer > p:last-child { font-size: 0.68rem; }
.neut-notice { padding: 18px; border: 1px solid var(--color-accent); border-radius: 10px; }
:root[data-theme="light"] .neut-page { --neut-green: #27613b; --neut-red: #a32932; --neut-soft: rgba(145, 86, 30, 0.045); }
:root[data-theme="light"] .neut-primary { color: #fffaf4; }
:root[data-theme="light"] .neut-primary:hover { color: #241508; }
@keyframes neut-ripple { from { transform: translateX(-50%) scale(0.4); opacity: 1; } to { transform: translateX(-50%) scale(4, 0.65); opacity: 0; } }
@media (max-width: 1180px) { .neut-hero { align-items: flex-start; flex-direction: column; gap: 20px; } }
@media (max-width: 1100px) and (min-width: 901px), (max-width: 700px) {
    .neut-lab-layout, .neut-reaction-layout, .neut-method-grid { grid-template-columns: 1fr; }
    .neut-lab-visual { border-left: 0; border-top: 1px solid var(--neut-border); }
}
@media (max-width: 520px) {
    .neut-page { padding-top: 0; }
    .neut-field-grid, .neut-answer-grid { grid-template-columns: 1fr; }
    .neut-lab-controls { padding: 18px; }
    .neut-readings { grid-template-columns: 1fr; gap: 8px; }
    .neut-readings > div { display: flex; justify-content: space-between; align-items: center; gap: 14px; }
    .neut-readings dd { flex-shrink: 0; margin: 0; }
    .neut-hero .neut-actions { flex-shrink: 1; }
    .neut-section-heading > .neut-button { width: 100%; }
    .neut-principle { padding: 19px; }
    .neut-equation { padding: 13px; font-size: 0.9rem; }
}
@media (prefers-reduced-motion: reduce) { .neut-page *, .neut-page *::before, .neut-page *::after { animation: none !important; transition: none !important; } }

.neut-diagram-colourless { fill: var(--neut-glass); fill-opacity: 0.045; stroke: var(--neut-glass); stroke-opacity: 0.6; stroke-width: 1; }

.neut-spoon-handle { fill: #c6cfd3; stroke: #6b7b82; stroke-width: 1.2; }
.neut-spoon-bowl { fill: #b5c0c5; stroke: #6b7b82; stroke-width: 1.2; }
.neut-spoon-well { fill: #eef2f4; stroke: #7f8e95; stroke-width: 1; }
.neut-spoon-shadow { fill: #96a4aa; opacity: 0.45; }
.neut-spoon-shine { fill: none; stroke: #f5f7f8; stroke-width: 1.1; }