:root{color-scheme:light;font-family:"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;color:#493e30;background:#fff8ea;--ink:#493e30;--green:#315f4e}*{box-sizing:border-box}body{margin:0;background-image:radial-gradient(#b9a28126 .7px,transparent .7px);background-size:16px 16px}header{max-width:1240px;margin:auto;padding:20px 28px;border-bottom:1px solid #d7c9ae;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}header span{font-size:13px;color:#71634e}main{max-width:1180px;margin:auto;padding:0 26px}h1,h2,h3,p{margin:0}p{line-height:1.8}h1{font-size:clamp(30px,4.8vw,48px);line-height:1.3;letter-spacing:.025em}h2{font-size:24px;line-height:1.5}h3{font-size:20px;line-height:1.5}.eyebrow{font-size:12px;letter-spacing:.12em;font-weight:750;color:#6b7459;margin-bottom:8px}.intro{padding:32px 0 24px}.intro>p:not(.eyebrow){margin-top:14px;color:#70624e}.mobile-break{display:none}.conditions{display:flex;flex-wrap:wrap;gap:8px;margin-top:17px}.conditions span{padding:7px 11px;border-radius:8px;background:#f2e8d0;font-size:14px}.reset-entry{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:15px}.reset-entry small,.small{font-size:13px;line-height:1.7;color:#73644e}button,input,textarea,summary{font:inherit;color:inherit}button,summary{min-height:44px}button{border:1.5px solid #acb795;border-radius:10px 13px 11px 12px;padding:10px 15px;background:#fffdf4;cursor:pointer;line-height:1.5}button:hover:not(:disabled):not(.drag-handle){background:#e9efdd}button:disabled{opacity:.5;cursor:not-allowed}.primary{background:#c9e1c6;border:2px solid #517359;font-weight:750}.danger{color:#8c452f;border-color:#b58268}button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #b76035;outline-offset:4px}.teacher-card{display:flex;gap:18px;align-items:center;background:#e9efdc;border:1.5px solid #c1cbaa;border-radius:19px 24px 21px 18px;padding:14px 22px 0 12px}.teacher-crop{flex:0 0 100px;height:145px;overflow:hidden;align-self:flex-end}.teacher-crop img{width:100px;height:auto;display:block}.teacher-copy{flex:1;min-width:0;display:grid;grid-template-columns:minmax(0,1fr);padding-bottom:16px;overflow-anchor:none}.guide-live,.guide-reserve{grid-area:1/1;min-width:0}.guide-reserve{visibility:hidden;pointer-events:none;user-select:none}.teacher-copy h2{font-size:22px}.teacher-copy p:not(.eyebrow){font-size:15px;line-height:1.75;margin-top:7px}.teacher-copy .guide-note{font-size:13px!important;color:#626a50}.steps{display:flex;gap:10px;padding:0;margin:18px 0;list-style:none;flex-wrap:wrap}.steps li{padding:8px 12px;color:#716b52;font-size:14px;border-radius:9px}.steps .current{background:#d5e4c7;color:#325e47;font-weight:800}.steps .done{color:#345b43;border-bottom:2px solid #789b6b}.workspace{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(270px,1fr);gap:22px;align-items:start}.lab-card,.notebook,.compare-card{padding:22px;background:#fffdf6;border:1.5px solid #d3c4a5;border-radius:20px 25px 18px 22px;box-shadow:0 3px 0 #d9caad55;min-width:0}.lab-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.lab-heading h2{font-size:23px}.pill{background:#e8eedb;border:1px solid #cdd8b9;border-radius:7px;padding:6px 9px;font-size:12px}.bench-caption{font-size:13px;color:#77684f;margin-top:12px}.bench{height:370px;position:relative;isolation:isolate;margin:0 -4px}.bench svg{display:block;width:100%;height:100%;overflow:visible}.drag-handle{position:absolute;transform:translate(-50%,-50%);width:44px;height:44px;padding:0;border:1px dashed #618064;border-radius:50%;background:#cde2bf22;box-shadow:none;touch-action:none;cursor:grab}.drag-handle span{opacity:0}.drag-handle.is-dragging{background:#e8d99b44;cursor:grabbing}.drag-handle:disabled{opacity:.65;cursor:default}.readouts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.readouts>div{text-align:center;padding:12px 4px;border-radius:10px;background:#edf1df}.readouts>div:nth-child(2){background:#f7e9d4}.readouts>div:nth-child(3){background:#e8eee1}.readouts span{display:block;font-size:13px}.readouts strong{display:block;font-size:25px;color:#315a49;line-height:1.7;min-height:44px}.readouts strong small{font-size:15px;font-weight:500}.motion-status{font-size:14px;line-height:1.75;min-height:3.5em;padding-top:10px;overflow-anchor:none}.actions{display:flex;gap:9px;flex-wrap:wrap;margin:12px 0}.actions>button{flex:1}.lab-card>.small{margin-top:12px}.lab-card details{margin-top:10px;font-size:13px}.lab-card details p{margin:7px 0}summary{padding:12px 0;cursor:pointer}.empty-note{text-align:center;padding:40px 0;color:#88785d}.record{padding:15px;margin-top:16px;border:1px dashed #b9bd98;border-radius:11px;background:#f3f0dd}.record.rough{background:#ebefdf}.record h3{font-size:17px}.record dl{display:grid;grid-template-columns:1fr auto;gap:8px;margin:12px 0 0;font-size:14px}.record dt,.record dd{margin:0}.record dd{font-weight:750}#save-status{font-size:13px;margin-top:18px;color:#6e654f}.compare-card{margin-top:24px;padding:26px}.compare-card>p{margin-top:10px}fieldset{min-width:0;border:1px solid #c7cbb0;border-radius:11px;padding:16px;margin:20px 0}legend{font-weight:750;padding:0 5px;line-height:1.6}fieldset label{display:flex;gap:9px;align-items:center;min-height:44px;margin:3px 0;line-height:1.6}input[type=radio],input[type=checkbox]{width:20px;height:20px;flex-shrink:0;margin:0}.feedback{font-size:14px;line-height:1.7;margin:10px 0;white-space:pre-wrap;overflow-wrap:anywhere}.error{color:#97452e}.good{color:#2d6448}#calculations,#conclusions{border-top:1px solid #d5ceb8;margin-top:24px;padding-top:24px}.calc-step{margin-top:18px;border:1px solid #c8cbb2;border-radius:12px;padding:18px}.answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:15px}.answer-field>label{font-size:14px;font-weight:700}.input-unit{display:flex;gap:8px;align-items:center;margin-top:8px}.input-unit input{min-width:0;flex:1;width:100%}input:not([type=radio]):not([type=checkbox]),textarea{border:1.5px solid #adb997;border-radius:8px;background:#fffef7;padding:10px;font-size:16px;min-height:44px}textarea{display:block;width:100%;resize:vertical;line-height:1.7;margin:10px 0}.answer-feedback{font-size:13px;min-height:1.7em;margin-top:7px}.hint,.revealed-answer{background:#f6ecd5;border-radius:9px;padding:12px;margin-top:10px;font-size:14px;line-height:1.8}.reveal{font-size:12px;padding:8px 10px;margin-top:7px}.completion{padding:20px;background:#e4eed8;border:1px solid #b6c6a1;border-radius:12px;margin-top:22px}.completion p{margin-top:10px}.revision{border-left:3px solid #96ad7f;padding:12px;margin-top:12px;background:#f1f2df;white-space:pre-wrap;overflow-wrap:anywhere}.teacher-details{margin-top:22px;color:#6e634e;font-size:14px}.teacher-details p{margin:10px 0}.alert{background:#fff0d8;border:2px solid #c69963;padding:18px;border-radius:12px;margin-bottom:20px}.alert h2{font-size:20px}.alert button{margin-top:10px}footer{text-align:center;padding:35px 20px;color:#756e55}footer p{font-size:12px;margin-top:8px}dialog{width:min(520px,94vw);max-height:90dvh;overflow-y:auto;border:2px solid #a8b593;border-radius:17px;background:#fff8e9;padding:24px;color:var(--ink)}dialog::backdrop{background:#453d315e}dialog h2{font-size:22px;margin-bottom:14px}dialog p{margin-bottom:14px}.ack{display:flex;gap:10px;align-items:center;min-height:44px;margin:16px 0;font-size:14px;line-height:1.7}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}
@media(max-width:900px){.workspace{grid-template-columns:1fr}.bench{height:350px}.notebook #records{display:grid;grid-template-columns:1fr 1fr;gap:12px}.empty-note{grid-column:1/-1;padding:18px}.record{margin-top:10px}}
@media(max-width:600px){header{padding:12px 14px;font-size:14px}header span{font-size:11px}main{padding:0 13px}.intro{padding:20px 0}.intro>p:not(.eyebrow){font-size:14px;margin-top:10px}.mobile-break{display:block}.conditions{gap:6px}.conditions span{font-size:12px;padding:6px 8px}.reset-entry{gap:8px}.reset-entry small{font-size:12px}.teacher-card{gap:8px;padding:12px 12px 0 4px}.teacher-crop{flex-basis:65px;height:105px}.teacher-crop img{width:65px}.teacher-copy{padding-bottom:12px}.teacher-copy h2{font-size:18px}.teacher-copy p:not(.eyebrow){font-size:14px}.teacher-copy .eyebrow{font-size:10px}.steps{gap:3px;margin:12px 0}.steps li{font-size:12px;padding:8px 7px}.lab-card,.notebook{padding:18px 12px}.lab-heading{align-items:start}.lab-heading h2{font-size:20px}.pill{font-size:11px;padding:5px 6px}.bench{height:300px}.bench-caption{font-size:12px}.readouts{gap:5px}.readouts span{font-size:12px}.readouts strong{font-size:22px}.readouts strong small{font-size:14px}.readouts>div{padding:10px 2px}.actions button{padding:10px 8px;font-size:14px}.notebook #records{grid-template-columns:1fr}.compare-card{padding:20px 13px}.compare-card h2{font-size:23px}fieldset{padding:12px}legend{font-size:15px}.answer-grid{grid-template-columns:1fr;gap:12px}.calc-step{padding:15px 12px}dialog{padding:18px}.completion{padding:16px}#force{font-size:20px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
