:root{--blue:#193e82;--navy:#102b57;--orange:#d97827;--ink:#183250;--muted:#52647b;--paper:#f5f7fb;--line:#d5dfeb;--warn:#993820;--warm:#fff5e9}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:var(--paper);font-family:system-ui,"Noto Sans TC","Microsoft JhengHei",sans-serif;color:var(--ink);font-size:17px;line-height:1.8}a{color:var(--blue);text-underline-offset:4px}button,input,select,textarea{font:inherit}button,a,select,input{touch-action:manipulation}button{cursor:pointer}button,select{min-height:46px;border:1px solid #9aaec7;border-radius:10px;background:#fff;color:var(--blue);padding:9px 14px}button:hover{background:#eaf0f9}button:disabled{cursor:default;opacity:.5}a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:4px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2.1rem,3.6vw,3.75rem);line-height:1.28;letter-spacing:-.035em;margin-bottom:23px}h2{font-size:clamp(1.55rem,2.5vw,2.2rem);line-height:1.4;letter-spacing:-.025em}h3{font-size:1.2rem;line-height:1.55}p{margin-bottom:16px}li+li{margin-top:8px}ul,ol{padding-left:1.4em}.wrap{width:min(1160px,calc(100% - 64px));margin:auto}.skip{position:absolute;left:15px;top:-80px;z-index:50;background:white;padding:12px}.skip:focus{top:12px}.masthead{background:white;border-bottom:1px solid var(--line)}.masthead .wrap{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:18px 0}.brand{display:flex;gap:12px;align-items:center;text-decoration:none}.brand strong{display:block;font-size:23px;letter-spacing:.08em}.brand small{display:block;color:var(--muted);font-size:12px}.toplinks{display:flex;gap:22px}.toplinks a{font-size:15px;padding:10px 0}.hero{background:var(--blue);color:white;padding:24px 0 50px;position:relative;overflow:hidden}.hero:after{content:"";position:absolute;width:460px;height:460px;border:65px solid #ffffff06;border-radius:50%;right:-200px;top:-100px;pointer-events:none}.crumb{display:flex;gap:20px;font-size:14px;margin-bottom:32px}.hero a{color:white}.hero-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:50px;align-items:center}.eyebrow{font-size:14px;font-weight:700;letter-spacing:.16em;margin-bottom:12px}.eyebrow:before{content:"";display:inline-block;width:27px;height:4px;background:var(--orange);margin-right:12px;vertical-align:middle}.lead{font-size:20px;line-height:1.9}.byline{font-size:13px;color:#dde7f5;margin-bottom:0}.hero-card{background:#fff;color:var(--ink);padding:28px;border-radius:20px;box-shadow:0 18px 40px #081c4033;border-top:5px solid var(--orange)}.hero-card h2{font-size:1.55rem}.hero-card p:last-child{margin-bottom:0}.tag,.kicker{font-size:13px;letter-spacing:.08em;font-weight:750;color:#8a430d}.kicker{color:var(--blue);margin-bottom:9px}.toc{display:flex;flex-wrap:wrap;gap:8px;border-bottom:1px solid var(--line);padding:20px 0}.toc a{display:inline-flex;align-items:center;min-height:44px;font-size:15px;padding:7px 15px;text-decoration:none;border-radius:30px;background:white;border:1px solid var(--line)}.section{padding:54px 0;border-bottom:1px solid var(--line)}.intro{max-width:850px;color:var(--muted)}.panel{background:white;border:1px solid var(--line);padding:28px;border-radius:18px}.soft{background:#edf2fa}.tool-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:24px;align-items:start}.field{margin-bottom:20px}.field label{display:block;font-weight:650;margin-bottom:8px}.field select{display:block;width:100%;font-size:16px}.fine{font-size:14px;color:var(--muted);line-height:1.8}.result{border-top:5px solid var(--orange);min-height:350px}.result h3{font-size:1.45rem}.result[data-state="urgent"]{border-top-color:var(--warn);background:#fff8f4}.badge{display:inline-block;border-radius:6px;background:#e9eff9;color:var(--blue);font-size:13px;padding:3px 8px;margin-bottom:12px}.result ul{margin-bottom:0}.notice{padding:16px 20px;border-left:4px solid var(--orange);background:var(--warm);border-radius:0 10px 10px 0}.danger{background:#fff0e9;border-left-color:var(--warn)}.cards{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:26px}.info-card{background:white;border:1px solid var(--line);border-radius:16px;padding:25px}.info-card[data-priority="true"]{border:2px solid var(--blue);box-shadow:0 5px 20px #193e8210}.info-card .recommend{display:none}.info-card[data-priority="true"] .recommend{display:inline-block}.info-card p{font-size:16px}.info-card p:last-child{margin-bottom:0}.info-card dt{font-size:14px;font-weight:750;color:var(--blue);margin-top:12px}.info-card dd{margin:4px 0 0}.diagram-layout{display:grid;grid-template-columns:1.15fr 1fr;gap:28px;align-items:start}.diagram{margin:0;background:radial-gradient(ellipse at 50% 40%,#fff,#e8eef7);border:1px solid var(--line);border-radius:20px;overflow:hidden}.diagram svg{display:block;width:100%;height:auto}.diagram figcaption{font-size:13px;color:var(--muted);padding:0 24px 20px}.tank-core,.tank-parts,.tank-labels,.tank-fault{opacity:0;transition:opacity .45s}.diagram[data-layer="1"] .tank-core,.diagram[data-layer="2"] .tank-core,.diagram[data-layer="3"] .tank-core,.diagram[data-layer="2"] .tank-parts,.diagram[data-layer="3"] .tank-parts,.diagram[data-layer="2"] .tank-labels,.diagram[data-layer="3"] .tank-labels,.diagram[data-layer="3"] .tank-fault{opacity:1}.diagram:not([data-layer="0"]) .tank-cover{opacity:0}.part-label{opacity:.7}.part-label.active{opacity:1;font-weight:800}.part-label.active path{stroke-width:4}.layers{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.layers button{font-size:14px;padding:9px 5px}.layers button[aria-pressed="true"],.parts button[aria-pressed="true"],.shots button[aria-current="step"]{color:white;background:var(--blue);border-color:var(--blue)}.readout{padding-top:23px;min-height:190px}.parts{display:flex;flex-wrap:wrap;gap:7px;margin:16px 0}.parts button{font-size:14px;padding:7px 10px}.part-detail{padding:16px;background:var(--paper);border-radius:10px;min-height:150px}.part-detail p{font-size:15px;margin-bottom:0}details{border:1px solid var(--line);background:white;border-radius:13px;margin-top:18px;padding:16px 22px}summary{font-weight:650;cursor:pointer;min-height:44px;display:list-item;align-content:center}details[open] summary{margin-bottom:16px}.model-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:30px;align-items:center}.slider-field{margin:22px 0}.slider-field label{display:block;margin-bottom:8px;font-weight:600}.slider-field input{width:100%;min-height:44px;accent-color:var(--blue)}.metric{background:var(--blue);color:white;border-radius:18px;padding:26px}.metric output{display:block;font-size:3.4rem;line-height:1.3;letter-spacing:-.04em;font-weight:800}.metric p{color:white;font-size:15px}.metric small{display:block;color:#e5edf8}.formula{font-family:inherit;overflow-wrap:anywhere;background:#eaf0f9;padding:16px;border-radius:12px}.player{border:1px solid var(--line);border-radius:20px;overflow:hidden;background:white}.movie-top{padding:18px 24px;background:var(--navy);color:white;display:flex;justify-content:space-between;gap:16px}.movie-top h3{color:white;margin:0;font-size:18px}.movie-top span{font-size:13px;white-space:nowrap}.movie-scene{padding:16px 24px 0;background:#edf2fa}.movie-scene svg{width:100%;height:auto;display:block;max-height:300px}.pipe{fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-width:15}.hot{stroke:#bb4c25}.cold{stroke:#357bbc}.flow{fill:none;stroke:#fff;stroke-width:3;stroke-dasharray:6 18;opacity:.8}.movie-scene[data-running="true"] .flow{animation:flow 1.4s linear infinite}.kitchen{opacity:.22}.movie-scene:not([data-stage="one"]) .kitchen{opacity:1}.movie-scene[data-stage="one"] .kitchen .flow{opacity:0;animation:none}.boiler-glow{fill:#e6a26f}.movie-scene[data-stage="heat"] .boiler-glow{fill:#f3842f}.movie-scene[data-stage="storage"] .boiler-glow{fill:#91b6d6}.movie-scene[data-stage="safe"] .flow{opacity:0}.subtitle{background:var(--navy);color:white;min-height:74px;display:flex;justify-content:center;align-items:center;text-align:center;padding:15px;font-size:21px;letter-spacing:.03em}.subtitle[hidden]{display:none}.movie-state{min-height:50px;margin:0;padding:13px 24px;background:#f7f9fc;color:var(--muted);font-size:14px}.player-controls{padding:19px 24px;display:flex;flex-wrap:wrap;gap:9px;align-items:center}.primary{background:var(--blue);color:white;border-color:var(--blue);font-weight:700}.primary:hover{background:var(--navy);color:white}.player-controls button,.player-controls select{font-size:14px}.shots{display:grid;grid-template-columns:repeat(6,1fr);gap:7px;padding:0 24px 23px}.shots button{font-size:14px}.progress{height:5px;background:#dde5f0}.progress span{height:100%;display:block;background:var(--orange);width:0}.transcript{margin-bottom:0}.transcript li{padding:12px 0}.transcript strong{color:var(--blue)}.recall{background:#edf2fa;padding:25px;border-radius:16px;margin-top:25px}.quiz-options{display:flex;flex-wrap:wrap;gap:8px}.quiz-feedback{margin:15px 0 0;min-height:28px}.checklist{display:grid;grid-template-columns:1fr 1fr;gap:27px}.checklist label{display:flex;align-items:flex-start;gap:12px;min-height:46px;margin-bottom:10px;cursor:pointer}.checklist input{width:22px;height:22px;min-width:22px;margin-top:6px;accent-color:var(--blue)}textarea{width:100%;min-height:220px;border:1px solid #aebed2;border-radius:10px;padding:14px;resize:vertical;color:var(--ink);background:#f8faff;font-size:15px}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}.actions button{font-size:14px}.cta{margin-top:25px;background:var(--blue);color:white;padding:30px;border-radius:18px;display:flex;gap:28px;align-items:center;justify-content:space-between}.cta h3{color:white;font-size:1.5rem;margin-bottom:8px}.cta p{margin-bottom:0;font-size:16px}.cta a.button{display:inline-flex;align-items:center;justify-content:center;background:white;color:var(--blue);padding:12px 22px;border-radius:10px;min-height:48px;text-decoration:none;font-weight:750;white-space:nowrap}.phone{color:white;font-size:16px}.related{display:grid;grid-template-columns:1fr 1fr;gap:10px}.related a{display:block;border:1px solid var(--line);border-radius:10px;padding:13px 17px;background:white;font-size:16px;min-height:48px}.footer{padding:30px 0;font-size:14px;color:var(--muted)}.footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px}.footer a{min-height:44px;display:inline-flex;align-items:center}.noscript{padding:18px;background:var(--warm)}[hidden]{display:none!important}@keyframes flow{to{stroke-dashoffset:-48}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}@media(max-width:800px){.wrap{width:calc(100% - 40px)}.hero-grid,.tool-grid,.diagram-layout,.model-grid,.checklist{grid-template-columns:1fr}.hero-grid{gap:24px}.hero{padding-bottom:30px}.hero-card{padding:24px}.toplinks{display:none}.section{padding:36px 0}.cards{gap:15px}.info-card{padding:20px}.diagram svg{max-height:560px}.cta{align-items:start;flex-direction:column}.hero h1{max-width:620px}.readout{min-height:0}.part-detail{min-height:0}}@media(max-width:520px){body{font-size:16px}.wrap{width:calc(100% - 32px)}.masthead .wrap{padding:13px 0}.brand strong{font-size:20px}.brand small{font-size:11px}.brand img{width:43px;height:43px}.hero h1{font-size:34px}.lead{font-size:18px}.hero-card h2{font-size:21px}.crumb{margin-bottom:24px}.toc{gap:6px}.toc a{font-size:14px;padding:7px 12px}.panel{padding:20px}.cards,.related{grid-template-columns:1fr}.info-card{padding:22px}.layers{gap:5px}.movie-top{padding:14px 16px;display:block}.movie-top span{display:block;margin-top:6px}.movie-scene{padding:10px 5px 0}.subtitle{font-size:17px;padding:12px 8px;min-height:65px}.movie-state{padding:13px 16px}.player-controls{padding:16px;gap:7px}.shots{padding:0 16px 18px;gap:5px}.shots button{padding:7px}.metric output{font-size:3rem}.cta{padding:24px}.diagram figcaption{padding:0 18px 18px}.formula{font-size:14px}.recall{padding:20px}.result{min-height:0}}@media print{body{background:white;font-size:12pt}.masthead,.hero,.toc,.section:not(#checklist),.footer,.actions,.cta{display:none!important}#checklist{border:none;padding:0}.wrap{width:100%}.checklist{display:block}.panel{border:none;padding:0}.checklist textarea{border:1px solid #777;height:250px}.checklist input{appearance:none}.checklist input:checked:after{content:"✓"}button{display:none}}

/* 廚房文字不淡化；未用水只用流線停止表達。 */
.movie-scene .kitchen{opacity:1}.movie-scene[data-stage="one"] .kitchen .flow{opacity:0}.tank-external{opacity:1}

/* Q855：限本頁播放器與圖解；不改共用資產。 */
.q855-player button,.q855-player select{min-height:44px;min-width:44px}
.q855-player button{border:2px solid #193e82;background:#fff;color:#193e82;opacity:1}
.q855-player button.primary{background:#d97827;color:#12233a;border-color:#193e82}
.q855-player button[aria-current="step"],.q855-player button[aria-pressed="true"]:not(.primary){background:#193e82;color:#fff}
.q855-player button:disabled{background:#e2e8f0;color:#334155;border-color:#526782;opacity:1;cursor:default}
.q855-player select{border:2px solid #193e82;color:#193e82;background:white}
.q855-player :is(button,select,input):focus-visible{outline:3px solid #193e82;outline-offset:4px;box-shadow:0 0 0 3px white}
.q855-player #subtitle,.q855-player #story-caption{box-sizing:border-box;min-height:calc(3.2em + 28px);line-height:1.6;font-size:18px;padding:14px 12px;background:#193e82;color:#fff;white-space:normal;overflow-wrap:anywhere}
.q855-caption-off{visibility:hidden}
#q855-status{font-size:16px;color:#193e82;background:white;padding:12px;border-radius:8px;min-height:3em;line-height:1.6}
#q855-status[data-error="true"]{border:2px solid #193e82;background:#fff3e8;color:#193e82}
.q855-player #progress-fill{background:#193e82}
.q855-player .progress{background:#dbe5f3}
.q855-player input[type=range]{accent-color:#193e82}
.q855-reduced *, .q855-reduced *::before,.q855-reduced *::after{animation:none!important;transition:none!important}
@media(prefers-reduced-motion:reduce){.q855-player *{animation:none!important;transition:none!important}}