:root{--blue:#193e82;--ink:#162b49;--muted:#50627a;--orange:#d97827;--pale:#edf4fb;--line:#cad7e7;--paper:#fff;--dark-orange:#a84a0a}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;color:var(--ink);background:#f7f9fc;font:17px/1.85 'Microsoft JhengHei','PingFang TC',system-ui,sans-serif}a{color:var(--blue);text-underline-offset:4px}button,input,select{font:inherit}button,select,input[type=range],summary{min-height:44px}button,select{border:1px solid #8ba1c0;border-radius:9px;background:#fff;color:var(--blue);padding:8px 14px}button{cursor:pointer}button[aria-pressed=true],.primary{background:var(--blue);color:#fff;border-color:var(--blue)}button:hover{box-shadow:0 0 0 2px #193e8222}button:disabled{opacity:.55;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:4px}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:12px;z-index:20;background:#fff;padding:10px}.site-header{border-bottom:1px solid var(--line);background:#fff}.bar{max-width:1180px;margin:auto;padding:16px 28px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:800;white-space:nowrap}.brand img{width:44px;height:44px;object-fit:contain}.bar nav{display:flex;gap:22px}.bar nav a{display:flex;align-items:center;min-height:44px;font-size:15px}main{max-width:1180px;margin:auto;padding:32px 28px 70px}.crumb{font-size:14px;color:var(--muted);margin-bottom:24px}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center;padding:22px 0 44px}.eyebrow{font-size:13px;letter-spacing:.13em;color:var(--dark-orange);font-weight:800}.hero h1{font-size:clamp(30px,3.9vw,49px);line-height:1.3;letter-spacing:-.03em;margin:12px 0 20px}.hero p{font-size:19px;line-height:1.8;margin:0}.hero-visual{border-radius:24px;background:linear-gradient(145deg,#e4edf7,#fff);padding:24px;box-shadow:inset 0 0 0 1px var(--line)}.hero-visual strong{font-size:15px}.hero-visual svg{width:100%;height:auto;display:block}.micro{font-size:14px;color:var(--muted)}.quick-nav{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:30px}.quick-nav a{padding:9px 14px;border:1px solid var(--line);border-radius:24px;text-decoration:none;background:#fff;font-size:15px;min-height:44px}.notice{padding:18px 22px;background:#fff5eb;border-left:4px solid var(--orange);border-radius:0 12px 12px 0}.article{max-width:900px;margin:0 auto}.article>section{margin:62px 0}.article h2{font-size:29px;line-height:1.45;letter-spacing:-.02em;margin:0 0 22px}.article h3{font-size:21px;margin-top:28px}.article p{margin:14px 0}.article li{margin:9px 0}.section-number{display:block;font-size:13px;letter-spacing:.12em;color:var(--dark-orange);margin-bottom:8px;font-weight:800}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px}.card h3{margin:0 0 10px;font-size:19px}.card p{margin:8px 0}.tag{font-size:13px;font-weight:700;color:var(--blue);background:var(--pale);border-radius:5px;padding:3px 8px}.tool{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;margin:24px 0;box-shadow:0 10px 35px #193e8208}.tool-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px}.tool-heading h3{margin:0}.controls{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}.controls button{font-size:15px}.diagram{position:relative;border-radius:12px;background:linear-gradient(#f6f9fc,#e8eff7);overflow:hidden}.diagram svg{display:block;width:100%;height:auto}.diagram .interior,.diagram .fault-mark,.diagram .part-labels,.diagram .pilot-only{display:none}.diagram[data-layer=inside] .interior,.diagram[data-layer=parts] .interior,.diagram[data-layer=fault] .interior{display:block}.diagram[data-layer=parts] .part-labels,.diagram[data-layer=fault] .part-labels,.diagram[data-layer=fault] .fault-mark{display:block}.diagram[data-type=pilot] .pilot-only{display:block}.diagram[data-type=pilot] .direct-only{display:none}.diagram[data-layer=outside] .outer-cover{opacity:1}.diagram:not([data-layer=outside]) .outer-cover{opacity:.13}.diagram svg text{font-family:'Microsoft JhengHei',sans-serif;font-size:17px;fill:var(--ink)}.diagram svg .tiny{font-size:14px}.diagram-caption{padding:16px;background:var(--pale);border-radius:10px;margin-top:14px;min-height:92px}.legend{display:flex;gap:20px;flex-wrap:wrap;font-size:14px;margin-top:10px}.dot{display:inline-block;width:10px;height:10px;border-radius:50%;background:var(--orange);margin-right:6px}.dot.blue{background:#2c72ba}.sim-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:28px}.field{display:block;margin:15px 0}.field>span{display:flex;justify-content:space-between;gap:12px;font-weight:700}.field input[type=range]{width:100%;accent-color:var(--blue)}select{max-width:100%;width:100%;margin:6px 0}.result{background:var(--blue);color:white;padding:22px;border-radius:16px;align-self:start}.result .big{font-size:44px;font-weight:800;line-height:1.3}.result p{font-size:15px}.result .micro{color:#e0eafa}.gauge-track{height:12px;background:#ffffff33;border-radius:10px;margin:18px 0;overflow:hidden}.gauge-fill{height:100%;width:25%;background:#f4ac64;transition:width .18s}.formula{font-family:ui-monospace,'Microsoft JhengHei',monospace;overflow-wrap:anywhere;background:var(--pale);padding:18px;border-radius:12px}.formula p{margin:8px 0}.table-wrap{overflow-x:auto;margin:20px 0}table{border-collapse:collapse;width:100%;background:#fff;font-size:15px}th,td{text-align:left;padding:14px;border:1px solid var(--line);vertical-align:top}th{background:var(--pale)}.unit-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.unit-grid input{width:100%;min-height:48px;padding:8px;border:1px solid #8ba1c0;border-radius:8px}.steps{padding-left:25px}.steps li{padding:7px 0 15px 10px}.recall{padding:22px;background:#edf4fb;border-radius:14px}.recall button{margin:6px 8px 0 0}.checklist{border:2px solid var(--blue);border-radius:16px;background:#fff;padding:24px}.checklist label{display:flex;gap:12px;align-items:flex-start;padding:10px 0;min-height:44px}.checklist input{margin-top:8px;width:20px;height:20px;accent-color:var(--blue);flex-shrink:0}.contact{background:var(--blue);color:#fff;padding:30px;border-radius:20px;margin-top:30px}.contact h2{color:#fff}.contact a{color:#fff}.contact .primary-link{display:inline-flex;align-items:center;justify-content:center;background:#fff;color:var(--blue);font-weight:800;min-height:48px;padding:10px 20px;border-radius:10px;text-decoration:none}.contact small{display:block;margin-top:12px}.story-stage{background:#193e82;color:#fff;border-radius:14px;min-height:260px;padding:26px;display:grid;align-content:center;gap:16px}.story-stage h3{color:#fff;margin:0;font-size:26px}.story-pipes{display:flex;align-items:center;justify-content:space-between;gap:10px}.story-pipes span{background:#fff2;padding:12px;border-radius:8px;font-size:15px;text-align:center;flex:1}.story-pipes b{color:#ffbb7b}.story-stage[data-scene='1'] .supply,.story-stage[data-scene='2'] .valve,.story-stage[data-scene='3'] .outlet,.story-stage[data-scene='4'] .valve,.story-stage[data-scene='5'] .outlet,.story-stage[data-scene='6'] .supply{box-shadow:0 0 0 3px #efac6c;background:#fff3}.story-stage[data-playing=true] b{animation:flow 1.2s infinite}.caption{background:#10264e;color:#fff;padding:12px;text-align:center;font-size:18px;min-height:60px;border-radius:8px}.story-status{color:var(--dark-orange);font-size:14px}.story-timeline{width:100%;accent-color:var(--blue)}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}details{background:#fff;border-top:1px solid var(--line);padding:14px 0}summary{cursor:pointer;font-weight:700;display:list-item;padding:8px 12px}details p{padding:0 14px}footer{background:#e8eef6;padding:26px;text-align:center;font-size:14px}body.no-js .js-only{display:none}.fallback{padding:16px;border:1px dashed #8ba1c0;border-radius:10px}.print-only{display:none}@keyframes flow{50%{opacity:.4;transform:translateX(4px)}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}html{scroll-behavior:auto}}@media(max-width:700px){.bar{padding:12px 18px}.bar nav a{font-size:14px}.bar nav a:first-child{display:none}main{padding:22px 18px 45px}.hero{grid-template-columns:1fr;gap:22px;padding-bottom:28px}.hero h1{font-size:34px}.hero p{font-size:18px}.hero-visual{padding:20px}.hero-visual svg{max-height:190px}.article>section{margin:46px 0}.article h2{font-size:25px}.cards,.sim-grid{grid-template-columns:1fr}.tool{padding:18px;border-radius:15px}.tool-heading{align-items:flex-start}.diagram svg text{font-size:19px}.diagram svg .tiny{font-size:16px}.controls{gap:8px}.controls button{padding:7px 10px}.unit-grid{grid-template-columns:1fr}.story-stage{padding:18px;min-height:280px}.story-pipes{gap:7px}.story-pipes span{font-size:13px;padding:9px 5px}.checklist{padding:18px}.contact{padding:22px}.result .big{font-size:40px}}@media print{body{background:#fff;color:#000}.site-header,.hero,.quick-nav,.article>section:not(#checklist),.notice,.crumb,footer{display:none!important}.article>section#checklist{margin:0}main{padding:0}.checklist{break-inside:avoid}.print-only{display:block}.contact{display:none}}

:is(#diagram,#q855-zoom-canvas .diagram) .direct-close-arrow{display:none}:is(#diagram,#q855-zoom-canvas .diagram)[data-direct-state="closed"] .direct-poppet{transform:translateY(-18px)}:is(#diagram,#q855-zoom-canvas .diagram)[data-direct-state="closed"] .direct-close-arrow{display:block}:is(#diagram,#q855-zoom-canvas .diagram)[data-direct-state="closed"] .direct-open-arrow{display:none}

.diagram .q855-chamber-label text{fill:#193e82}#q855-zoom{width:min(1100px,95vw);max-height:90vh;box-sizing:border-box;border:2px solid #193e82;border-radius:16px;padding:20px;color:#193e82;background:white}#q855-zoom::backdrop{background:#12233acc}.q855-zoom-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}#q855-zoom button,#q855-zoom-open{min-height:44px;color:#193e82;background:white;border:2px solid #193e82}#q855-zoom-canvas{overflow:auto;max-height:60vh;overscroll-behavior:contain;margin:16px 0}#q855-zoom-canvas .diagram{width:1040px;max-width:none;padding:16px}#q855-zoom-canvas svg{width:100%;height:auto}#q855-zoom-canvas:focus-visible,#q855-zoom button:focus-visible,#q855-zoom-open:focus-visible{outline:3px solid #193e82;outline-offset:4px}

/* 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}}