:root{color-scheme:light;--ink:#204534;--muted:#59715f;--green:#2d6c50;--line:#cdddc9;--cream:#fbf8ec;--gold:#e3ba62;font:18px/1.6 system-ui,Segoe UI,sans-serif;color:var(--ink);background:#f3f5ed}*{box-sizing:border-box}body{margin:0}#plant-app{max-width:1380px;margin:auto;padding:30px}h1{font-size:clamp(2.4rem,4.5vw,4.4rem);line-height:1.04;letter-spacing:-.045em;margin:18px 0}h2{font-size:clamp(1.6rem,3vw,2.25rem);line-height:1.2;margin:0 0 18px}h3{font-size:1.35rem;line-height:1.2}button,input,select,textarea{font:inherit}button,summary,select{cursor:pointer}button{min-height:49px;padding:12px 17px;border:1px solid #a7be9e;border-radius:13px;background:#fffef7;color:var(--ink);line-height:1.3}button:hover:not(:disabled){background:#ecf3df;border-color:#507d57}button:disabled{opacity:.5;cursor:default}button:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,g[role=button]:focus-visible{outline:3px solid #307fbb;outline-offset:4px}.primary{color:white;background:var(--green);border-color:var(--green)}.primary:hover:not(:disabled){background:#1b523a}.hero{display:grid;grid-template-columns:1fr 1fr;background:var(--cream);border:1px solid var(--line);border-radius:30px;overflow:hidden;box-shadow:0 15px 40px #2a4a2410}.hero-copy{padding:40px}.hero figure{margin:0;position:relative;min-width:0}.hero img{display:block;width:100%;height:100%;max-height:610px;object-fit:cover}.hero figcaption{position:absolute;bottom:0;padding:12px 18px;background:#fffaf0e6;font-size:.7rem;width:100%;line-height:1.5}.eyebrow{font-weight:800;font-size:.73rem;letter-spacing:.13em;color:#5d775b;text-transform:uppercase}.pill{border-radius:30px;background:#e9efdb;padding:8px 14px;font-size:.84rem;font-weight:650}.actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:18px 0}.toolbar{padding:28px 0 14px}.toolbar fieldset{border:0;padding:0;display:flex;gap:12px;flex-wrap:wrap}.toolbar legend{font-weight:750;margin-bottom:14px}.toolbar button[aria-pressed=true]{background:var(--green);color:white}.task-link{display:inline-flex;align-items:center;min-height:49px;padding:11px 17px;border:1px solid var(--line);border-radius:12px;background:#fffef7;color:var(--ink);text-decoration:none}.small{font-size:.82rem;color:var(--muted);line-height:1.65}.steps{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:8px;padding:15px 0 24px}.steps button{text-align:left;font-size:.86rem;min-height:112px;padding:15px 11px}.steps button>span{display:block;font-weight:800;color:#8c9d6d;font-size:.8rem;margin-bottom:8px}.steps small{display:block;color:#6d8064;font-size:.73rem;margin-top:6px}.steps [aria-current]{border:2px solid #648251;background:#e9efdf}.panel,.mission{margin:22px 0;padding:32px;border:1px solid var(--line);border-radius:24px;background:#fffef8}.mission{background:#e8efdf}.mission>h2{max-width:26ch}.mini-comic{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:30px 0 14px}.mini-comic>div{display:flex;align-items:center;gap:18px;padding:18px;background:#fffdf2;border:1px solid #cad7bd;border-radius:20px}.mini-comic p{font-weight:650}.comic-icon{font-size:2.3rem}.goals{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding-left:25px}.help{background:#edf5f8;border:1px solid #bfd6dd;border-radius:14px;margin:22px 0;overflow:hidden}.help summary{min-height:49px;padding:13px 17px;font-weight:700;color:#265f77}.help ol,.help>p{padding:4px 25px 19px 43px;margin:0}.help li{margin:10px 0}.organ-layout,.water-layout{display:grid;grid-template-columns:1fr 1fr;gap:38px;align-items:start}.organ-layout>div,.water-layout>div{min-width:0}.plant-model{display:block;width:100%;max-height:680px}.plant-model .organ{transition:filter .15s}.plant-model g[role=button]{cursor:pointer}.plant-model .selected{filter:drop-shadow(0 0 9px #f0b946)}.water-path{fill:none;stroke:#367fab;stroke-width:12;stroke-linecap:round;stroke-linejoin:round}.organ-buttons{display:grid;grid-template-columns:1fr 1fr;gap:10px}.organ-buttons [aria-pressed=true]{background:#e6efdc;border:2px solid #5d7c4a}.organ-card{padding:24px;border-radius:20px;background:#f5f2df;border:1px solid #dbd7b8;margin-top:22px}.organ-card h3{font-size:2.2rem;margin:12px 0}.hint{padding:18px 20px;background:#fbefce;border-left:4px solid #d5ac53;border-radius:12px}.success{padding:18px 20px;background:#e4f1db;border-left:4px solid #6b9755;border-radius:12px}.match-row{display:grid;grid-template-columns:1.2fr 1fr;gap:20px;align-items:center;padding:15px 0;border-bottom:1px solid #d9e1ce}.match-row select,select,textarea{min-height:49px;padding:11px;border:1px solid #aac0a1;background:white;border-radius:11px;color:var(--ink);max-width:100%}[data-match]>.primary{margin-top:22px}.feedback{padding:18px 20px;background:#edf3e5;border-radius:14px;margin:20px 0}.feedback:empty{display:none}.feedback p{margin:10px 0}.range-label{display:block;font-size:1.4rem;font-weight:700;margin:24px 0}.range-label input{display:block;width:100%;min-height:55px;margin:20px 0;accent-color:var(--green)}.water-note{font-size:1.3rem;font-weight:700;padding:23px;border:1px solid #a5c8db;border-radius:18px;background:#eaf4fa}.route-built{padding:23px;border:2px dashed #a9bd95;border-radius:15px;min-height:85px;font-size:1.25rem;background:#f7f7e9}.photo-inputs{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:26px 0}.photo-inputs button{min-height:145px;font-weight:700;background:#f4f3e8}.photo-inputs span{display:block;font-size:2.1rem;color:#477a54;margin-bottom:9px}.photo-inputs small{display:block;margin-top:9px;font-size:.8rem;font-weight:500}.photo-inputs [aria-pressed=true]{background:#e9f1dd;border:2px solid #799752}.photo-inputs [aria-pressed=false]{border:2px dashed #ab9d7c;background:#fbf5e8}.photo-output{background:#ecf3e2;padding:23px;border-radius:18px;border:1px solid #c1d5ad}.photo-output strong{font-size:1.2rem}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.compare-grid article{padding:26px;background:#f3f3e5;border-radius:18px;border:1px solid #d2dcc5}.compare-grid article>label{display:grid;grid-template-columns:1fr 1.2fr;gap:15px;align-items:center;margin:15px 0}.compare-grid h3{margin-top:0}.compare-grid ul{padding-left:24px}.experiment-feedback{margin-top:24px}.data-source{padding:18px 20px;background:#edf3f7;border-left:4px solid #83adbd;border-radius:12px}.data-chart{display:block;max-height:430px;width:100%}.table-scroll{overflow-x:auto;margin:20px 0}table{width:100%;border-collapse:collapse;text-align:left}caption{text-align:left;font-weight:750;margin-bottom:13px}th,td{padding:13px 12px;border:1px solid #c6d5ba}thead{background:#e9f0de}tbody th{background:#f2f5e8}.question{border-top:1px solid var(--line);padding:24px 0}.question fieldset{padding:0;border:0;min-width:0}.question legend{font-size:1.25rem;font-weight:750;line-height:1.4;margin-bottom:15px}.choices{display:grid;gap:11px;margin:15px 0 20px}.choices label{display:flex;gap:14px;align-items:flex-start;padding:16px;border:1px solid #bccdae;border-radius:13px;background:white;cursor:pointer}.choices input{width:22px;height:22px;flex:0 0 auto;accent-color:var(--green);margin-top:3px}.choices label:has(input:checked){background:#edf4e2;border:2px solid #557d4c;padding:15px}.sample{font-size:1.08rem;padding:23px;background:#f0f4e5;border-left:4px solid #9bae7d;border-radius:3px 14px 14px 3px;line-height:1.85}.reading{max-width:78ch}.role-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:25px 0}.role-grid article{padding:24px;border-radius:16px;background:#f4efdc}.writing-label{display:block;font-weight:650}.writing-label textarea{display:block;width:100%;min-height:240px;margin-top:16px;resize:vertical;font-weight:400;line-height:1.7}.starters{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.starters span{padding:10px 14px;border-radius:11px;background:#edf1df}.checklist{padding:20px;border:1px solid var(--line);border-radius:16px}.checklist label{display:flex;gap:13px;align-items:center;padding:10px 0}.checklist input{width:22px;height:22px;accent-color:var(--green)}.score{padding:20px;border-radius:14px;background:#e6efdd;font-weight:700}.bottom-nav{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;margin:30px 0}.skip{position:absolute;left:-9999px}.skip:focus{left:20px;top:10px;background:white;padding:15px;z-index:10}#lesson:focus{outline:0}footer{font-size:.8rem;color:#60725a;padding:25px 0}footer a{color:var(--green)}footer details{padding:15px 0}blockquote{margin:16px 0;padding:14px 18px;background:#fff9df;border-left:3px solid #d3b15f}.question .feedback:focus{outline:2px solid #75996a;outline-offset:3px}
@media(max-width:1000px){.hero-copy{padding:28px}.steps{grid-template-columns:repeat(4,1fr)}.mini-comic{grid-template-columns:1fr}.mini-comic>div{padding:12px 18px}.organ-layout,.water-layout{gap:22px}.hero img{min-height:380px}.compare-grid article>label{grid-template-columns:1fr;gap:8px}}
@media(max-width:600px){:root{font-size:17px}#plant-app{padding:14px}.hero{grid-template-columns:1fr;border-radius:23px}.hero-copy{padding:26px}.hero img{height:260px;min-height:0}.hero figcaption{font-size:.65rem;padding:8px 12px}.toolbar fieldset{display:grid;width:100%;grid-template-columns:1fr}.toolbar button{text-align:left}.steps{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.steps button{min-height:100px}.panel,.mission{padding:21px;margin:18px 0;border-radius:18px}.goals,.organ-layout,.water-layout,.compare-grid,.role-grid{grid-template-columns:1fr}.plant-model{max-height:510px}.organ-card{padding:20px}.organ-card h3{font-size:1.8rem}.match-row{grid-template-columns:1fr;gap:8px}.water-note{font-size:1.15rem}.photo-inputs{gap:8px}.photo-inputs button{padding:12px 5px;font-size:.8rem;min-height:135px}.photo-inputs span{font-size:1.8rem}.compare-grid article{padding:19px}.compare-grid article>label{grid-template-columns:1fr 1fr}.compare-grid select{width:100%}th,td{padding:9px 7px;font-size:.85rem}.sample{padding:17px;font-size:1rem}.question legend{font-size:1.1rem}.choices label{padding:13px}.choices label:has(input:checked){padding:12px}.bottom-nav button{font-size:.9rem}.writing-label textarea{min-height:300px}.photo-inputs button{overflow-wrap:anywhere}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}@media print{.toolbar,.steps,.bottom-nav,.skip{display:none}.hero{display:block}.hero img{height:150px}.panel{break-inside:avoid}body{background:white}button{background:white;color:var(--ink)}}
.quiz-results{list-style:none;margin:1.2rem 0;padding:0;display:grid;gap:.6rem;grid-template-columns:repeat(2,minmax(0,1fr))}.quiz-results button{width:100%;display:flex;flex-wrap:wrap;gap:.4rem;justify-content:space-between;text-align:left}.quiz-results strong{color:#215d43}@media(max-width:600px){.quiz-results{grid-template-columns:1fr}}

.learning-materials{max-width:1320px;margin:24px auto!important}@media(max-width:600px){.learning-materials{margin:18px!important}}
/* A complete experimental condition must remain readable on narrow screens. */
@media(max-width:600px){.compare-grid article>label{grid-template-columns:minmax(0,1fr);gap:7px}.compare-grid article>label select{width:100%;min-width:0}}

/* Scoped language selector; all existing lesson geometry/layout retained. */
.language-control{display:flex;align-items:center;gap:15px;flex-wrap:wrap;margin:0 0 22px}.language-control select{min-width:200px;max-width:100%}.language-control>span{font-weight:750}
.mobile-data{display:none}.table-scroll:focus-visible{outline:3px solid #307fbb;outline-offset:4px}
@media(max-width:600px){.desktop-data{display:none}.mobile-data{display:grid;gap:14px;margin:20px 0}.data-card{padding:18px;border:1px solid #c6d5ba;border-radius:14px;background:#f2f5e8}.data-card h3{margin:0 0 12px}.data-card dl{margin:0}.data-card dl>div{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;padding:7px 0;border-top:1px solid #d5dfca}.data-card dt,.data-card dd{margin:0;overflow-wrap:anywhere}.data-card dd{font-weight:700}}