.rx-page {
    --rx-muted: var(--color-text-muted);
    --rx-line: var(--color-border);
    --rx-soft: rgba(238, 172, 96, .055);
    --rx-green: #9ad9b0;
    --rx-red: #f3a0a0;
    --rx-glass: #aac3cc;
    max-width: 1500px;
    margin: 0 auto;
    line-height: 1.6;
}
.rx-page [hidden] { display: none !important; }
.rx-page :is(button, input, textarea) { font: inherit; }
.rx-page :is(a, button, input, textarea, summary) { touch-action: manipulation; }
.rx-page :focus-visible { outline: 3px solid var(--color-accent); outline-offset: 4px; }
.rx-page :is(h1, h2, h3) { color: var(--color-text); line-height: 1.15; }
.rx-page p { color: var(--rx-muted); }
.rx-page sub { font-size: .7em; }
.rx-hero { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(240px, .8fr); align-items: center; gap: 36px; padding-bottom: 31px; }
.rx-eyebrow { margin: 0 0 10px; color: var(--color-accent) !important; font-size: .64rem; font-weight: 700; letter-spacing: .13em; }
.rx-hero h1 { margin: 14px 0 18px; font-size: clamp(2.1rem, 4.3vw, 3.7rem); font-weight: 750; letter-spacing: -.045em; }
.rx-hero h1 span { color: var(--color-accent); }
.rx-hero > div > p:last-child { max-width: 610px; margin: 0; font-size: .9rem; }
.rx-steps { display: grid; gap: 19px; padding: 9px 0 9px 26px; margin: 0; border-left: 1px solid var(--rx-line); list-style: none; }
.rx-steps li { display: flex; align-items: center; gap: 13px; }
.rx-steps li > span { display: grid; place-items: center; flex-shrink: 0; width: 33px; height: 33px; border: 1px solid var(--rx-line); border-radius: 50%; color: var(--color-accent); font-size: .7rem; }
.rx-steps strong { display: block; font-size: .8rem; }
.rx-steps small { display: block; margin-top: 2px; color: var(--rx-muted); font-size: .72rem; }
.rx-panel { border: 1px solid var(--rx-line); border-radius: 14px; background: var(--color-bg-panel); }
.rx-lab { padding: 24px; container-type: inline-size; }
.rx-section-heading { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 20px; }
.rx-section-heading h2 { margin: 0; font-size: clamp(1.25rem, 2.2vw, 1.7rem); letter-spacing: -.025em; }
.rx-section-heading .rx-eyebrow { margin-bottom: 6px; }
.rx-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; }
.rx-button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 42px; padding: 9px 14px; border: 1px solid var(--rx-line); border-radius: 7px; background: var(--rx-soft); color: var(--color-text); font-size: .75rem !important; font-weight: 700 !important; cursor: pointer; }
.rx-button:hover { border-color: var(--color-accent); background: rgba(238, 172, 96, .13); }
.rx-primary { background: var(--color-accent); border-color: var(--color-accent); color: #241508; }
.rx-primary:hover { background: #ffca90; }
.rx-button:disabled { cursor: default; opacity: .55; }
.rx-bench-caption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 18px; padding: 0 0 18px; color: var(--rx-muted); font-size: .66rem; }
.rx-bench-caption > span:first-child { display: flex; gap: 8px; align-items: center; }
.rx-bench-caption i { width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); }
.rx-tubes { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.rx-tube-card { min-width: 0; display: flex; flex-direction: column; border: 1px solid var(--rx-line); border-radius: 10px; overflow: hidden; background: var(--rx-soft); transition: border-color 180ms; }
.rx-tube-card[data-phase="running"] { border-color: var(--color-accent); }
.rx-tube-topline { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 5px; padding: 14px 14px 0; font-size: .54rem; letter-spacing: .07em; color: var(--color-accent); }
.rx-type { color: var(--rx-muted); font-size: .55rem; letter-spacing: 0; }
.rx-tube-card h3 { margin: 11px 14px 6px; min-height: 2.4em; font-size: .86rem; line-height: 1.3; }
.rx-sample-formula { margin: 0 14px; color: var(--color-accent) !important; font-size: 1.3rem; line-height: 1.4; }
.rx-sample-formula small { margin-left: 5px; color: var(--rx-muted); font-size: .62rem; }
.rx-visual { display: flex; justify-content: center; background: radial-gradient(ellipse at 50% 60%, rgba(156, 200, 213, .06), transparent 65%); }
.rx-tube-svg { display: block; width: 100%; max-width: 200px; height: 250px; color: var(--rx-glass); }
.rx-tube-shadow { fill: #000; opacity: .13; }
.rx-glass { fill: none; stroke: var(--rx-glass); stroke-width: 2; }
.rx-rim { fill: var(--color-bg-card); stroke: var(--rx-glass); stroke-width: 1.8; }
.rx-glass-shine { fill: none; stroke: var(--rx-glass); stroke-width: 3; opacity: .17; }
.rx-meniscus { fill: #b7d9e0; fill-opacity: .12; stroke: var(--rx-glass); stroke-opacity: .55; stroke-width: 1; }
.rx-graduations { fill: none; stroke: var(--rx-glass); stroke-width: 1.2; opacity: .55; }
.rx-leader { fill: none; stroke: var(--rx-glass); stroke-width: 1; opacity: .5; }
.rx-liquid-label { fill: var(--rx-muted); font: 11px Arial, sans-serif; }
.rx-tube-sticker rect { fill: var(--color-bg-card); fill-opacity: .9; stroke: var(--rx-line); }
.rx-tube-sticker text { fill: var(--color-accent); font: bold 13px Arial, sans-serif; }
.rx-white-solid { fill: #edece2; stroke: #a7b7b5; stroke-width: 1.1; }
.rx-solid-edge { fill: none; stroke: #aebbb7; stroke-width: 1; }
.rx-bubbles { opacity: 0; stroke: var(--rx-glass); }
.rx-solid { transform-box: view-box; transform-origin: 110px 290px; }
.rx-tube-card { --rx-reaction-duration: 10s; }
.rx-tube-card[data-tube="metal"] { --rx-dissolve: rx-dissolve; }
.rx-tube-card[data-tube="oxide"] { --rx-dissolve: rx-powder-dissolve; }
.rx-tube-card[data-tube="carbonate"] { --rx-dissolve: rx-chunks-dissolve; }
.rx-tube-card[data-phase="running"] .rx-solid { animation: var(--rx-dissolve, rx-dissolve) var(--rx-reaction-duration) linear forwards; }
.rx-tube-card[data-phase="complete"] .rx-solid { opacity: 0; transform: scale(0); }
.rx-tube-card[data-phase="running"] .rx-bubbles { animation: rx-effervescence var(--rx-reaction-duration) linear forwards; }
.rx-tube-card[data-phase="running"] .rx-bubble { animation: rx-bubble var(--duration) var(--delay) linear infinite; }
.rx-tube-card[data-tube="metal"] .rx-bubbles { fill: var(--rx-glass); fill-opacity: .12; }
.rx-tube-card[data-tube="carbonate"][data-phase="running"] .rx-bubble:nth-child(3n) { animation-name: rx-bubble-burst; animation-duration: calc(var(--duration) * 1.45); }
.rx-surface-ripples { opacity: 0; fill: none; stroke: var(--rx-glass); stroke-width: .8; }
.rx-tube-card[data-phase="running"] .rx-surface-ripples { animation: rx-effervescence var(--rx-reaction-duration) linear forwards; }
.rx-tube-card[data-phase="running"] .rx-surface-ripple { transform-box: fill-box; transform-origin: center; animation: rx-surface-ripple .65s var(--ripple-delay) ease-out infinite; }
.rx-tube-card[data-tube="carbonate"] .rx-surface-ripple { animation-duration: 1.65s; }
.rx-powder-grain { opacity: 0; fill: #edece2; }
.rx-tube-card[data-phase="running"] .rx-powder-grain { animation: rx-disperse var(--grain-duration) var(--grain-delay) ease-out 2 both; }
@keyframes rx-dissolve { 0%, 8% { transform: scale(1); opacity: 1; } 75% { transform: scale(.35); opacity: .6; } 100% { transform: scale(0); opacity: 0; } }
@keyframes rx-powder-dissolve { 0% { transform: scale(1); opacity: 1; } 35% { transform: scale(.9, .6); opacity: .8; } 80% { transform: scale(.35, .2); opacity: .3; } 100% { transform: scale(0); opacity: 0; } }
@keyframes rx-chunks-dissolve { 0%, 12% { transform: scale(1); opacity: 1; } 35% { transform: scale(.85); opacity: 1; } 70% { transform: scale(.5); opacity: .8; } 100% { transform: scale(0); opacity: 0; } }
@keyframes rx-effervescence { 0%, 82% { opacity: 1; } 100% { opacity: 0; } }
@keyframes rx-bubble { 0% { transform: translate(0, 0); opacity: 0; } 9% { opacity: .95; } 88% { opacity: .85; } 100% { transform: translate(var(--drift), var(--rise)); opacity: 0; } }
@keyframes rx-bubble-burst { 0%, 19% { transform: translate(0, 0); opacity: 0; } 25% { opacity: .95; } 86% { opacity: .85; } 100% { transform: translate(var(--drift), var(--rise)); opacity: 0; } }
@keyframes rx-surface-ripple { 0% { opacity: .8; transform: scale(.3); } 100% { opacity: 0; transform: scale(2.1, 1.4); } }
@keyframes rx-disperse { 0% { opacity: 0; translate: 0 0; } 12% { opacity: .8; } 65% { opacity: .35; } 100% { opacity: 0; translate: var(--grain-x) var(--grain-y); } }
.rx-card-bottom { display: flex; flex-direction: column; flex: 1; padding: 0 14px 14px; }
.rx-appearance { min-height: 2.8em; margin: 0 0 10px; text-align: center; font-size: .66rem; line-height: 1.4; }
.rx-tube-status { display: flex; align-items: center; justify-content: center; min-height: 2.9em; margin: 0 0 10px; border-top: 1px solid var(--rx-line); padding-top: 9px; text-align: center; color: var(--color-text) !important; font-size: .68rem; line-height: 1.35; }
.rx-tube-run { width: 100%; margin-top: auto; }
.rx-bench-footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 18px; }
.rx-progress { color: var(--color-accent); font-size: .72rem; font-weight: 700; flex-shrink: 0; }
.rx-bench-footer p { max-width: 540px; margin: 0; font-size: .65rem; line-height: 1.5; text-align: right; }
.rx-accessible { margin-top: 12px; color: var(--rx-muted); font-size: .72rem; }
.rx-accessible summary { cursor: pointer; width: fit-content; text-decoration: underline; text-underline-offset: 3px; }
.rx-accessible p { margin: 10px 0 0; }
.rx-notebook { margin-top: 36px; }
.rx-notebook .rx-section-heading { margin-bottom: 12px; }
.rx-small { color: var(--rx-muted); font-size: .68rem; }
.rx-intro { max-width: 880px; margin: 0 0 22px; font-size: .82rem; }
.rx-notebook-key { display: grid; grid-template-columns: 1fr 1.4fr 2fr; gap: 22px; padding: 0 20px 10px; color: var(--rx-muted); font-size: .57rem; font-weight: 700; letter-spacing: .1em; }
.rx-entry { display: grid; grid-template-columns: 1fr 1.4fr 2fr; align-items: start; gap: 22px; padding: 20px; margin-top: 10px; }
.rx-entry-sample { display: flex; align-items: start; gap: 10px; min-width: 0; }
.rx-entry-number { display: grid; place-items: center; flex-shrink: 0; width: 27px; height: 27px; border: 1px solid var(--rx-line); border-radius: 7px; color: var(--color-accent); font-size: .66rem; }
.rx-entry-sample h3 { margin: 4px 0 10px; font-size: .82rem; line-height: 1.3; }
.rx-entry-sample div > span { display: block; font-size: 1.12rem; color: var(--color-accent); }
.rx-entry-sample small { display: block; margin-top: 10px; color: var(--rx-muted); font-size: .62rem; line-height: 1.4; }
.rx-page label { display: block; margin: 0 0 7px; color: var(--color-text); font-size: .68rem; font-weight: 700; }
.rx-required { float: right; margin-left: 5px; color: var(--rx-muted); font-size: .58rem; font-weight: 400; }
.rx-observation-field, .rx-equation-field { min-width: 0; }
.rx-page textarea, .rx-page input { display: block; width: 100%; min-width: 0; border: 1px solid var(--rx-line); border-radius: 6px; padding: 10px; background: var(--color-bg-card); color: var(--color-text); font-size: .75rem; }
.rx-page textarea { min-height: 112px; resize: vertical; line-height: 1.6; }
.rx-page :is(textarea, input)::placeholder { color: var(--rx-muted); opacity: .75; }
.rx-page [aria-invalid="true"] { border-color: var(--rx-red); }
.rx-page input[data-correct="true"] { border-color: var(--rx-green); }
.rx-reactants { margin: 0 0 8px; color: var(--color-text) !important; font-size: .86rem; overflow-wrap: anywhere; }
.rx-reactants > span { padding-left: 5px; color: var(--color-accent); }
.rx-product-inputs { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; }
.rx-product-inputs input { flex: 1 1 74px; width: 74px; min-height: 42px; }
.rx-product-inputs > span { color: var(--rx-muted); font-size: .8rem; }
.rx-entry-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 15px; margin-top: 10px; }
.rx-check { min-height: 38px; padding: 7px 12px; font-size: .67rem !important; }
.rx-text-button { min-height: 40px; padding: 5px 0; border: 0; background: transparent; color: var(--color-accent); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; font-size: .68rem !important; }
.rx-feedback { margin: 10px 0 0; padding: 9px 11px; border-left: 2px solid var(--color-accent); background: var(--rx-soft); border-radius: 0 5px 5px 0; font-size: .72rem; }
.rx-feedback[data-kind="correct"] { border-color: var(--rx-green); color: var(--rx-green); }
.rx-feedback[data-kind="incorrect"] { border-color: var(--rx-red); color: var(--rx-red); }
.rx-observation-hint { margin: 8px 0 0; color: var(--rx-red) !important; font-size: .68rem; }
.rx-explanation { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--rx-line); font-size: .73rem; }
.rx-explanation p { margin: 0 0 7px; }
.rx-explanation p:first-child { color: var(--color-text); font-weight: 700; overflow-wrap: anywhere; }
.rx-explanation strong { color: var(--color-text); }
.rx-no-reaction-hint { margin: -2px 0 8px; font-size: .64rem; }
.rx-notebook-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 12px; }
.rx-notebook-footer p { margin: 0; color: var(--color-accent); font-size: .78rem; font-weight: 700; }
.rx-lesson-footer { margin: 20px 0 0; padding: 18px 22px; border-left: 2px solid var(--color-accent); border-radius: 0 10px 10px 0; background: var(--rx-soft); }
.rx-lesson-footer > p { margin: 0; font-size: .8rem; }
.rx-lesson-footer strong { color: var(--color-text); }
.rx-lesson-footer details { margin-top: 10px; color: var(--rx-muted); font-size: .72rem; }
.rx-lesson-footer summary { cursor: pointer; }
.rx-lesson-footer ul { padding-left: 18px; }
.rx-lesson-footer a { color: var(--color-accent); text-underline-offset: 3px; }
.rx-notice { padding: 16px; border: 1px solid var(--rx-line); }
:root[data-theme="light"] .rx-page { --rx-green: #267445; --rx-red: #b33138; --rx-glass: #607f8b; }
@container (max-width: 690px) { .rx-tubes { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 1200px) {
    .rx-entry, .rx-notebook-key { grid-template-columns: .85fr 1.25fr 1.8fr; gap: 15px; }
    .rx-tube-topline { padding-inline: 11px; }
}
@media (max-width: 760px) {
    .rx-hero { grid-template-columns: 1fr; gap: 23px; }
    .rx-steps { grid-template-columns: repeat(3, 1fr); padding: 0; border: 0; gap: 12px; }
    .rx-steps li { align-items: start; gap: 8px; }
    .rx-steps strong { font-size: .67rem; }
    .rx-steps small { display: none; }
    .rx-steps li > span { width: 25px; height: 25px; font-size: .6rem; }
    .rx-notebook-key { display: none; }
    .rx-entry { grid-template-columns: 1fr 1.4fr; gap: 18px; }
    .rx-entry-sample { grid-column: 1 / -1; align-items: center; }
    .rx-entry-sample > div { display: flex; align-items: center; flex-wrap: wrap; gap: 7px 16px; }
    .rx-entry-sample h3, .rx-entry-sample small { margin: 0; }
    .rx-lab { padding: 18px; }
    .rx-bench-footer { align-items: start; flex-direction: column; gap: 8px; }
    .rx-bench-footer p { text-align: left; }
}
@media (max-width: 480px) {
    .rx-hero h1 { font-size: 2.55rem; }
    .rx-hero > div > p:last-child { font-size: .83rem; }
    .rx-steps { gap: 7px; }
    .rx-steps li { flex-direction: column; }
    .rx-tubes { gap: 9px; }
    .rx-lab { padding: 14px; }
    .rx-tube-card h3 { min-height: 2.7em; margin-inline: 10px; font-size: .78rem; }
    .rx-tube-topline { padding: 11px 10px 0; }
    .rx-tube-topline .rx-type { display: none; }
    .rx-tube-svg { height: 218px; }
    .rx-sample-formula { margin-inline: 10px; font-size: 1.12rem; }
    .rx-card-bottom { padding: 0 10px 10px; }
    .rx-appearance { min-height: 4em; }
    .rx-tube-run { padding-inline: 5px; font-size: .65rem !important; }
    .rx-tube-status { min-height: 3.3em; font-size: .62rem; }
    .rx-entry { grid-template-columns: 1fr; padding: 17px; }
    .rx-entry-sample { grid-column: auto; }
    .rx-entry-sample small { flex-basis: 100%; }
    .rx-page textarea { min-height: 90px; }
    .rx-notebook .rx-section-heading { gap: 8px; }
}
@media (prefers-reduced-motion: reduce) {
    .rx-tube-card[data-phase="running"] .rx-solid { animation: none; opacity: .4; transform: scale(.6); }
    .rx-tube-card[data-phase="running"] :is(.rx-bubbles, .rx-surface-ripples) { animation: none; opacity: 1; }
    .rx-tube-card[data-phase="running"] .rx-bubble { animation: none; transform: translateY(-65px); opacity: .8; }
    .rx-tube-card[data-phase="running"] .rx-surface-ripple { animation: none; }
    .rx-tube-card[data-phase="running"] .rx-powder-grain { animation: none; translate: var(--grain-x) var(--grain-y); opacity: .35; }
    .rx-tube-card { transition: none; }
}