/* Salts page only. The body background and site navigation come from the shared stylesheet. */
.salts-page {
    --salts-muted: #c4b9ad;
    --salts-border: rgba(220, 180, 140, 0.22);
    --salts-red: #f18498;
    --salts-blue: #8dabff;
    --salts-green: #97d3ae;
    padding-top: 12px;
    line-height: 1.6;
}

.salts-page [hidden] { display: none !important; }
.salts-page button, .salts-page input { font: inherit; }
.salts-page button, .salts-page a, .salts-page summary, .salts-page input { touch-action: manipulation; }
.salts-page :focus-visible { outline: 3px solid var(--color-accent); outline-offset: 5px; }
.salts-page h1, .salts-page h2, .salts-page h3 { color: var(--color-text); line-height: 1.2; }
.salts-page h2 { margin: 0; font-size: clamp(1.25rem, 2.3vw, 1.7rem); }
.salts-page p { color: var(--salts-muted); }
.salts-eyebrow { margin: 0 0 8px; color: var(--color-accent) !important; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.15em; }

.salts-hero { display: flex; align-items: center; justify-content: space-between; gap: 28px; padding: 16px 0 36px; }
.salts-hero h1 { margin: 8px 0 16px; font-size: clamp(2rem, 4.3vw, 3.6rem); letter-spacing: -0.045em; }
.salts-hero h1 span { color: var(--color-accent); }
.salts-hero > div > p:last-child { max-width: 680px; margin: 0; font-size: 1rem; }
.salts-hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.salts-button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-height: 44px; padding: 10px 17px; border: 1px solid var(--salts-border); border-radius: 9px; text-decoration: none; font-size: 0.85rem; font-weight: 700; cursor: pointer; transition: background 160ms, border-color 160ms; }
.salts-button-secondary { flex-shrink: 0; background: rgba(255, 255, 255, 0.035); color: var(--color-text); }
.salts-button-secondary:hover { background: rgba(238, 172, 96, 0.12); border-color: var(--color-accent); }
.salts-button-primary { background: var(--color-accent); color: #221409; border-color: var(--color-accent); }
.salts-button-primary:hover { background: #ffd09a; }
.salts-panel { border: 1px solid var(--salts-border); border-radius: 18px; padding: clamp(18px, 2.6vw, 32px); background: rgba(20, 16, 14, 0.85); box-shadow: var(--card-shadow); }
.salts-section-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.salts-heading-copy { display: flex; align-items: center; gap: 15px; }
.salts-step { display: grid; place-items: center; flex-shrink: 0; width: 43px; height: 43px; color: var(--color-accent); background: rgba(238, 172, 96, 0.08); border: 1px solid var(--salts-border); border-radius: 12px; font-size: 0.9rem; }
.salts-section-heading .salts-eyebrow { margin-bottom: 5px; }

.salts-lab-toolbar { display: flex; align-items: center; gap: 32px; flex-wrap: wrap; padding: 18px 22px; border: 1px solid var(--salts-border); border-radius: 12px; background: rgba(255, 255, 255, 0.025); }
.salts-paper-picker { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; padding: 0; border: 0; }
.salts-paper-picker legend { margin-bottom: 10px; font-weight: 700; font-size: 0.85rem; }
.salts-paper-option { display: flex; align-items: center; gap: 9px; min-height: 44px; padding: 8px 12px; border: 1px solid var(--salts-border); border-radius: 8px; cursor: grab; font-size: 0.85rem; }
.salts-paper-option:has(input:checked) { background: rgba(238, 172, 96, 0.08); border-color: var(--color-accent); }
.salts-paper-option input { margin: 0; accent-color: var(--color-accent); }
.salts-paper-swatch { display: inline-block; width: 10px; height: 27px; border-radius: 2px; transform: rotate(12deg); }
.salts-paper-blue { background: var(--salts-blue); }
.salts-paper-red { background: var(--salts-red); }
.salts-lab-instruction { margin: 0; font-size: 0.82rem; }
.salts-lab-instruction strong { color: var(--color-text); }

.salts-workbench { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; padding: 24px 0; }
.salts-solution { min-width: 0; overflow: hidden; padding: 16px 14px 18px; border: 1px solid var(--salts-border); border-radius: 13px; background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(238, 172, 96, 0.035)); text-align: center; transition: border-color 160ms, background 160ms; }
.salts-solution.is-dragover { border-color: var(--color-accent); background: rgba(238, 172, 96, 0.1); }
.salts-solution-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 0.65rem; }
.salts-solution-letter { letter-spacing: 0.1em; color: var(--salts-muted); }
.salts-solution-state { padding: 3px 8px; border-radius: 5px; background: rgba(255, 255, 255, 0.055); color: var(--salts-muted); }
.salts-beaker-button { position: relative; display: flex; flex-direction: column; align-items: center; width: 100%; min-height: 244px; margin: 12px 0 0; padding: 68px 0 0; border: 0; background: transparent; color: var(--salts-muted); cursor: pointer; }
.salts-beaker { position: relative; display: block; width: 118px; height: 126px; border: 2px solid rgba(210, 229, 241, 0.65); border-top: 0; border-radius: 3px 3px 19px 19px; background: linear-gradient(100deg, rgba(255, 255, 255, 0.09), transparent 25%, transparent 75%, rgba(255, 255, 255, 0.06)); }
.salts-beaker::before { position: absolute; top: -5px; left: -7px; right: -7px; height: 5px; border: 2px solid rgba(210, 229, 241, 0.65); border-radius: 50%; background: #1d2021; content: ''; }
.salts-beaker::after { position: absolute; left: 9px; top: 10px; bottom: 13px; width: 3px; border-radius: 3px; background: rgba(255, 255, 255, 0.14); content: ''; }
.salts-liquid { position: absolute; inset: 41px 3px 3px; border-radius: 0 0 15px 15px; background: linear-gradient(180deg, rgba(130, 194, 209, 0.24), rgba(130, 194, 209, 0.1)); border-top: 2px solid rgba(164, 220, 230, 0.4); }
.salts-beaker-marks { position: absolute; right: 9px; top: 23px; width: 16px; height: 65px; background: repeating-linear-gradient(to bottom, rgba(220, 233, 240, 0.4) 0 1px, transparent 1px 16px); }
.salts-beaker-formula { position: absolute; inset: 58px 0 auto; font-size: 0.95rem; font-weight: 700; color: #d8e8ed; }
.salts-dipping-paper { position: absolute; z-index: 1; top: 2px; left: calc(50% - 9px); width: 18px; height: 88px; border: 1px solid rgba(255, 255, 255, 0.25); border-radius: 2px; transform: rotate(12deg); box-shadow: 3px 4px 10px rgba(0, 0, 0, 0.25); }
.salts-dipping-paper::after { position: absolute; inset: 53% -1px -1px; border-radius: 0 0 2px 2px; background: var(--salts-result-color, transparent); content: ''; }
.salts-solution.is-dipping .salts-dipping-paper { animation: salts-dip 650ms ease-in-out; }
.salts-beaker-button:hover .salts-beaker { border-color: var(--color-accent); }
.salts-dip-prompt { margin-top: 17px; color: var(--color-accent); font-size: 0.75rem; }
.salts-solution h3 { margin: 7px 0 14px; font-size: 0.95rem; }
.salts-strip-results { display: flex; justify-content: center; gap: 7px; flex-wrap: wrap; }
.salts-strip-results > span { padding: 4px 7px; border: 1px solid var(--salts-border); border-radius: 5px; font-size: 0.66rem; color: var(--salts-muted); }
.salts-page .is-acidic { color: var(--salts-red); }
.salts-page .is-neutral { color: var(--salts-green); }
.salts-page .is-alkaline { color: var(--salts-blue); }
.salts-page .is-red { color: var(--salts-red); border-color: rgba(241, 132, 152, 0.45); }
.salts-page .is-blue { color: var(--salts-blue); border-color: rgba(141, 171, 255, 0.45); }
.salts-experiment-status { min-height: 60px; padding: 15px 18px; border-left: 3px solid var(--color-accent); border-radius: 0 8px 8px 0; background: rgba(238, 172, 96, 0.055); font-size: 0.85rem; }
.salts-progress-row { display: flex; align-items: center; gap: 18px; margin: 18px 0 24px; font-size: 0.75rem; color: var(--salts-muted); }
.salts-progress-row progress { width: 130px; height: 5px; border: 0; border-radius: 5px; overflow: hidden; accent-color: var(--color-accent); background: rgba(255, 255, 255, 0.1); }
.salts-progress-row progress::-webkit-progress-bar { background: rgba(255, 255, 255, 0.1); }
.salts-progress-row progress::-webkit-progress-value { background: var(--color-accent); }
.salts-progress-row progress::-moz-progress-bar { background: var(--color-accent); }
.salts-observations { padding-top: 16px; border-top: 1px solid var(--salts-border); }
.salts-page summary { cursor: pointer; font-weight: 700; font-size: 0.9rem; }
.salts-table-scroll { overflow-x: auto; margin-top: 12px; }
.salts-results-table { width: 100%; min-width: 570px; border-collapse: collapse; font-size: 0.8rem; text-align: left; }
.salts-results-table caption { padding-bottom: 12px; color: var(--salts-muted); font-size: 0.75rem; text-align: left; }
.salts-results-table th, .salts-results-table td { padding: 12px; border-bottom: 1px solid var(--salts-border); }
.salts-results-table thead th { color: var(--salts-muted); font-size: 0.7rem; font-weight: 400; }
.salts-results-table tbody th { font-weight: 400; }
.salts-results-table td { color: var(--salts-muted); }
.salts-footnote { margin: 18px 0 0; font-size: 0.72rem; }

.salts-concepts { margin: 38px 0; }
.salts-temperature, .salts-quiz-count { flex-shrink: 0; color: var(--salts-muted); font-size: 0.75rem; }
.salts-concept-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.salts-concept { padding: 22px; border: 1px solid var(--salts-border); border-top: 2px solid var(--salts-tone); border-radius: 10px; background: rgba(15, 13, 12, 0.82); }
.salts-concept-acidic { --salts-tone: var(--salts-red); }
.salts-concept-neutral { --salts-tone: var(--salts-green); }
.salts-concept-alkaline { --salts-tone: var(--salts-blue); }
.salts-concept-range { color: var(--salts-tone); font-size: 0.75rem; font-weight: 700; }
.salts-concept h3 { margin: 9px 0; font-size: 1.25rem; }
.salts-concept p { margin: 0 0 16px; font-size: 0.82rem; }
.salts-concept strong { color: var(--salts-tone); font-size: 0.77rem; }
.salts-why { margin-top: 18px; padding: 17px 20px; border: 1px solid var(--salts-border); border-radius: 10px; background: rgba(15, 13, 12, 0.82); }
.salts-why p, .salts-why li { font-size: 0.85rem; color: var(--salts-muted); }
.salts-why ul { padding-left: 20px; }
.salts-why li + li { margin-top: 8px; }

.salts-quiz { scroll-margin-top: calc(var(--site-top-height, 64px) + 24px); }
.salts-quiz-intro { margin: -5px 0 24px; font-size: 0.9rem; }
.salts-question { min-width: 0; margin: 0 0 25px; padding: 0 0 25px; border: 0; border-bottom: 1px solid var(--salts-border); }
.salts-question legend { width: 100%; padding: 0; margin-bottom: 14px; font-size: 0.95rem; font-weight: 700; }
.salts-question-number { margin-right: 9px; color: var(--color-accent); font-size: 0.8rem; }
.salts-answer-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.salts-answer { display: flex; align-items: center; gap: 12px; min-height: 49px; padding: 12px 14px; border: 1px solid var(--salts-border); border-radius: 8px; cursor: pointer; color: var(--salts-muted); font-size: 0.85rem; background: rgba(255, 255, 255, 0.02); }
.salts-answer input { flex-shrink: 0; margin: 0; accent-color: var(--color-accent); }
.salts-answer:hover, .salts-answer:has(input:checked) { border-color: var(--color-accent); background: rgba(238, 172, 96, 0.07); color: var(--color-text); }
.salts-answer.is-correct { border-color: var(--salts-green); background: rgba(151, 211, 174, 0.08); }
.salts-answer.is-incorrect { border-color: var(--salts-red); background: rgba(241, 132, 152, 0.08); }
.salts-question-feedback { margin: 13px 0 0; font-size: 0.85rem; }
.salts-question-feedback.is-correct { color: var(--salts-green); }
.salts-question-feedback.is-incorrect { color: var(--salts-red); }
.salts-quiz-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
#saltsQuizAnswered { margin-left: auto; color: var(--salts-muted); font-size: 0.8rem; }
.salts-quiz-result { margin-top: 22px; padding: 18px 20px; border: 1px solid var(--color-accent); border-radius: 10px; background: rgba(238, 172, 96, 0.08); font-size: 0.95rem; }
.salts-situations { margin-top: 32px; scroll-margin-top: calc(var(--site-top-height, 64px) + 24px); }
.salts-situation-progress { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 22px; color: var(--salts-muted); font-size: 0.8rem; }
.salts-situation-progress progress { flex: 1; min-width: 80px; height: 7px; accent-color: var(--color-accent); }
.salts-situation-context { display: flex; align-items: center; gap: 24px; margin-bottom: 24px; padding: 20px; border: 1px solid var(--salts-border); border-left: 3px solid var(--color-accent); border-radius: 10px; background: rgba(238, 172, 96, 0.055); }
.salts-situation-illustration { display: block; flex: 0 0 200px; width: 200px; max-width: 100%; height: auto; }
.salts-situation-copy { flex: 1; min-width: 0; }
.salts-situation-copy > p:last-child { margin: 0; color: var(--color-text); font-size: 0.95rem; }
.salts-situation-question { margin-bottom: 20px; padding-bottom: 0; border-bottom: 0; }
.salts-situation-question .salts-answer { align-items: flex-start; }
.salts-situation-question input { margin-top: 6px; }
.salts-situation-question .salts-answer:has(input:disabled) { cursor: default; }
.salts-situation-answer-state { display: block; font-size: 0.72rem; }
.salts-situation-answer-state:not(:empty) { margin-top: 7px; }
.salts-situation-answer-state, .salts-situation-feedback.is-correct > strong { color: var(--salts-green); }
.salts-situation-question .is-incorrect .salts-situation-answer-state, .salts-situation-feedback.is-incorrect > strong { color: var(--salts-red); }
.salts-situation-feedback { margin: 0 0 22px; padding: 18px 20px; border: 1px solid var(--salts-border); border-radius: 10px; background: rgba(255, 255, 255, 0.025); font-size: 0.85rem; }
.salts-situation-feedback p { margin: 8px 0 12px; }
.salts-situation-feedback .salts-situation-equation { color: var(--color-text); overflow-wrap: anywhere; }
.salts-situation-feedback a, .salts-situation-review a { color: var(--color-accent); text-underline-offset: 3px; font-size: 0.75rem; }
.salts-situation-results h3 { margin: 0 0 10px; font-size: 1.5rem; }
.salts-situation-review { display: grid; gap: 12px; margin: 22px 0; padding: 0; list-style: none; }
.salts-situation-review li { padding: 18px 20px; border: 1px solid var(--salts-border); border-left: 3px solid var(--salts-green); border-radius: 8px; font-size: 0.85rem; }
.salts-situation-review li.is-incorrect { border-left-color: var(--salts-red); }
.salts-situation-review li > strong { color: var(--salts-green); }
.salts-situation-review li.is-incorrect > strong { color: var(--salts-red); }
.salts-situation-review p { margin: 8px 0 0; }
.salts-situation-review a { display: inline-block; margin-top: 10px; }
.salts-sources { margin: 28px 0 0; text-align: center; font-size: 0.72rem; }
.salts-sources a { color: var(--color-accent); text-underline-offset: 3px; }
.salts-notice { padding: 16px; border: 1px solid var(--color-accent); border-radius: 10px; }

@keyframes salts-dip { 0%, 100% { transform: translateY(0) rotate(12deg); } 50% { transform: translateY(65px) rotate(0); } }
@media (max-width: 1150px) { .salts-hero { align-items: flex-start; flex-direction: column; gap: 18px; } }
@media (max-width: 640px) {
    .salts-page { padding-top: 0; }
    .salts-hero { padding-bottom: 26px; }
    .salts-section-heading { align-items: flex-start; flex-wrap: wrap; gap: 16px; }
    .salts-lab-toolbar { gap: 18px; padding: 15px; }
    .salts-workbench, .salts-concept-grid, .salts-answer-grid { grid-template-columns: 1fr; }
    .salts-workbench { gap: 12px; }
    .salts-solution { padding: 14px 20px; }
    .salts-beaker-button { min-height: 227px; }
    .salts-solution h3 { font-size: 1rem; }
    .salts-concept { padding: 20px; }
    .salts-strip-results > span { font-size: 0.75rem; }
    .salts-situation-context { flex-direction: column; gap: 14px; }
    .salts-situation-illustration { flex-basis: auto; width: 170px; }
    .salts-situation-copy { width: 100%; }
    #saltsQuizAnswered { width: 100%; margin-left: 0; }
    .salts-sources a { display: inline-block; }
}
@media (prefers-reduced-motion: reduce) {
    .salts-page *, .salts-page *::before, .salts-page *::after { animation: none !important; transition: none !important; }
}