@property --lvl{syntax: "<number>"; inherits: true; initial-value: 0;}:root{--scheme: light;color-scheme:light;--bg: oklch(.972 .005 175);--panel: oklch(.938 .006 200);--card: oklch(.99 .003 175);--ink: oklch(.27 .022 222);--muted: oklch(.46 .02 222);--line: oklch(.27 .022 222 / .14);--rule: oklch(.27 .022 222 / .32);--wall: oklch(.83 .01 220);--water: oklch(.55 .13 242);--water-soft: oklch(.86 .055 235);--primary: oklch(.47 .1 232);--primary-fg: oklch(.985 .004 240);--primary-hover: oklch(.42 .095 232);--track: oklch(.27 .022 222 / .1);--ok-fill: oklch(.55 .015 222);--alarm: oklch(.52 .19 28);--alarm-ink: oklch(.47 .18 28);--warn: oklch(.87 .15 92);--warn-ink: oklch(.24 .03 80);--input: oklch(.56 .015 222);--ring: oklch(.47 .1 232);--deep-bg: oklch(.255 .042 240);--deep-panel: oklch(.305 .045 240);--shadow-color: oklch(.3 .03 222 / .12);--water-ink: oklch(.5 .13 244);--rej: oklch(.66 .075 52)}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--scheme: dark;color-scheme:dark;--bg: oklch(.205 .012 222);--panel: oklch(.255 .013 222);--card: oklch(.235 .012 222);--ink: oklch(.93 .008 200);--muted: oklch(.75 .015 210);--line: oklch(.93 .008 200 / .14);--rule: oklch(.93 .008 200 / .3);--wall: oklch(.36 .016 222);--water: oklch(.72 .12 236);--water-soft: oklch(.38 .07 240);--primary: oklch(.76 .105 236);--primary-fg: oklch(.2 .03 240);--primary-hover: oklch(.81 .09 236);--track: oklch(.93 .008 200 / .12);--ok-fill: oklch(.68 .015 210);--alarm: oklch(.7 .17 30);--alarm-ink: oklch(.78 .13 32);--input: oklch(.58 .015 215);--ring: oklch(.76 .105 236);--deep-bg: oklch(.165 .026 240);--deep-panel: oklch(.225 .032 240);--shadow-color: oklch(0 0 0 / .4);--water-ink: oklch(.78 .11 232);--rej: oklch(.52 .07 52)}}:root[data-theme=dark]{--scheme: dark;color-scheme:dark;--bg: oklch(.205 .012 222);--panel: oklch(.255 .013 222);--card: oklch(.235 .012 222);--ink: oklch(.93 .008 200);--muted: oklch(.75 .015 210);--line: oklch(.93 .008 200 / .14);--rule: oklch(.93 .008 200 / .3);--wall: oklch(.36 .016 222);--water: oklch(.72 .12 236);--water-soft: oklch(.38 .07 240);--primary: oklch(.76 .105 236);--primary-fg: oklch(.2 .03 240);--primary-hover: oklch(.81 .09 236);--track: oklch(.93 .008 200 / .12);--ok-fill: oklch(.68 .015 210);--alarm: oklch(.7 .17 30);--alarm-ink: oklch(.78 .13 32);--input: oklch(.58 .015 215);--ring: oklch(.76 .105 236);--deep-bg: oklch(.165 .026 240);--deep-panel: oklch(.225 .032 240);--shadow-color: oklch(0 0 0 / .4);--water-ink: oklch(.78 .11 232);--rej: oklch(.52 .07 52)}[data-tone=deep],.js .mast:not([data-past]){--scheme: dark;color-scheme:dark;--bg: var(--deep-bg);--panel: var(--deep-panel);--card: var(--deep-panel);--ink: oklch(.965 .008 225);--muted: oklch(.82 .025 228);--line: oklch(.965 .008 225 / .14);--rule: oklch(.965 .008 225 / .3);--wall: oklch(.44 .04 240);--water: oklch(.76 .115 228);--water-soft: oklch(.42 .07 236);--primary: oklch(.8 .105 228);--primary-fg: oklch(.21 .04 240);--primary-hover: oklch(.86 .085 228);--track: oklch(.965 .008 225 / .14);--ok-fill: oklch(.74 .02 225);--alarm: oklch(.68 .18 28);--alarm-ink: oklch(.79 .135 30);--input: oklch(.62 .02 230);--ring: oklch(.8 .105 228);background:var(--bg);color:var(--ink)}:root{--sans: "Instrument Sans", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;--mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;--fs-xs: .8125rem;--fs-s: .9375rem;--fs-m: 1rem;--fs-l: 1.25rem;--fs-xl: 1.5625rem;--fs-2xl: 2.25rem;--r1: 4px;--r2: 8px;--hdr: 60px;--bar: 52px;--nodecol: 240px;--colgap: 40px;--dur-press: .11s;--dur-hover: .15s;--dur-pop: .2s;--dur-enter: .36s;--ease-out: cubic-bezier(.2, 0, 0, 1);--ease-in: cubic-bezier(.4, 0, 1, 1);--shadow-2: 0 1px 1px var(--shadow-color), 0 3px 5px var(--shadow-color), 0 8px 14px var(--shadow-color)}*,*:before,*:after{box-sizing:border-box}html{background:var(--bg);scroll-behavior:smooth;scroll-padding-top:calc(var(--hdr) + var(--bar) + 12px);-webkit-text-size-adjust:100%}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:var(--fs-m);line-height:1.75;letter-spacing:.02em;font-variant-numeric:tabular-nums;overflow-x:clip}:root:lang(zh-Hant){text-autospace:normal;line-break:strict;font-synthesis-style:none}h1,h2,h3{text-wrap:balance;line-height:1.25;letter-spacing:0;margin:0;font-weight:600}pre,code,kbd,samp,.mono,.u,.num-m{font-variant-ligatures:none;letter-spacing:0;text-spacing-trim:space-all;text-autospace:no-autospace}p{margin:0}a{color:inherit;text-underline-offset:.2em}img,svg{display:block;max-width:100%}:focus-visible{outline:2px solid var(--ring);outline-offset:2px;border-radius:2px}::selection{background:color-mix(in oklch,var(--water) 28%,transparent)}.num{font-variant-numeric:tabular-nums}.nw,p .mono{white-space:nowrap}.mono{font-family:var(--mono);font-weight:500;letter-spacing:0}.u{font-family:var(--mono);font-weight:500;letter-spacing:0;color:var(--muted)}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.sprite{position:absolute;width:0;height:0;overflow:hidden}[hidden]{display:none!important}.skip{position:absolute;left:12px;top:-60px;z-index:50;background:var(--ink);color:var(--bg);padding:8px 14px;border-radius:var(--r1)}.skip:focus{top:8px}.wrap{max-width:1240px;margin-inline:auto;padding-inline:max(32px,env(safe-area-inset-left,0px) + .5rem) max(32px,env(safe-area-inset-right,0px) + .5rem)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:var(--r1);border:1.5px solid transparent;background:var(--primary);color:var(--primary-fg);font:inherit;font-weight:600;text-decoration:none;cursor:pointer;letter-spacing:.04em;transition:background-color var(--dur-hover) var(--ease-out),translate var(--dur-press) var(--ease-out),border-color var(--dur-hover) var(--ease-out)}.btn:active{translate:0 1px}@media(hover:hover){.btn:hover{background:var(--primary-hover)}}.btn-line{background:transparent;color:var(--ink);border-color:var(--ink)}@media(hover:hover){.btn-line:hover{background:var(--panel)}}.btn-sm{min-height:40px;padding:0 14px;font-size:var(--fs-s)}.mast{position:sticky;top:0;z-index:30;background:var(--bg);border-bottom:1px solid var(--line);transition:background-color .3s var(--ease-out),border-color .3s var(--ease-out)}.js .mast:not([data-past]){border-bottom-color:transparent}.mast-cta{transition:background-color var(--dur-hover) var(--ease-out),border-color var(--dur-hover) var(--ease-out),color var(--dur-hover) var(--ease-out)}.menu-cta{display:none}.mast-in{display:flex;align-items:center;gap:20px;height:var(--hdr)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;margin-right:auto}.brand-mark{width:30px;height:30px;flex:none}.brand-name{font-size:var(--fs-l);font-weight:600;letter-spacing:.08em}.brand-sub{font-size:var(--fs-xs);color:var(--muted);letter-spacing:.12em}.nav .menu-btn{display:none}.links{display:flex;gap:4px;list-style:none;margin:0;padding:0;position:static;inset:auto;border:0;background:none;overflow:visible;color:inherit;width:auto;height:auto}.links a{display:block;padding:8px 10px;border-radius:var(--r1);text-decoration:none;font-size:var(--fs-s);transition:background-color var(--dur-hover) var(--ease-out)}@media(hover:hover){.links a:hover{background:var(--panel)}}.run{position:relative}.pipe-svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none;z-index:0}.pipe-guide,.pipe-wall,.pipe-fg{fill:none;stroke-linejoin:round}.pipe-guide{stroke:var(--rule);stroke-width:1.5;stroke-dasharray:2 7}.pipe-wall{stroke:var(--wall);stroke-width:16;stroke-dasharray:1 1;stroke-dashoffset:1}.pipe-fg{stroke:var(--water);stroke-width:6;stroke-linecap:round;stroke-dasharray:1 1;stroke-dashoffset:1}.pipe-head{fill:var(--water);stroke:var(--bg);stroke-width:3;display:none}.pipe-dots circle{fill:var(--bg);opacity:.9;animation:travel var(--dur, 60s) linear infinite;offset-rotate:0deg}@keyframes travel{0%{offset-distance:0%}to{offset-distance:100%}}.run[data-paused] .pipe-dots circle{animation-play-state:paused}.pipe-arrows{fill:var(--water);display:none}.run>section{position:relative;z-index:1}.row{display:grid;column-gap:var(--colgap);align-items:start}.row-l{grid-template-columns:var(--nodecol) minmax(0,1fr)}.row-r{grid-template-columns:minmax(0,1fr) var(--nodecol)}.row-r .node{order:2}.row-r .st-body{justify-self:end}.node{display:flex;flex-direction:column;align-items:center}.eq{--eq-ink: var(--ink);--eq-paper: var(--bg);--eq-wall: var(--wall);--eq-pipe: var(--water);--eq-water: var(--water-soft);--lvl: 0;width:168px;height:144px;overflow:visible;transition:--lvl .7s var(--ease-out)}.node.on .eq,html:not(.js) .eq{--lvl: 1}.eq-inlet{width:60px;height:80px}.tag{position:relative;display:inline-grid;grid-template-rows:1fr 1fr;width:56px;height:56px;flex:none;border-radius:50%;border:1.5px solid var(--ink);background:var(--bg);font-family:var(--mono);font-weight:500;font-size:var(--fs-xs);line-height:1;letter-spacing:0;justify-items:center;overflow:hidden}.tag:after{content:"";position:absolute;left:0;right:0;top:50%;border-top:1.5px solid var(--ink)}.tag b{align-self:end;padding-bottom:6px;font-weight:500}.tag i{align-self:start;padding-top:6px;font-style:normal}.tag-node{margin:10px 0 0 104px}.node.on .tag-node{background:linear-gradient(var(--bg) 50%,var(--water-soft) 50%)}.node-cap{font-size:var(--fs-xs);color:var(--muted);text-align:left;align-self:flex-start;margin:6px 0 0 calc(50% + 24px);line-height:1.5}.node-cap .mono{display:block;color:var(--ink)}.hero{position:relative;display:flex;flex-direction:column;overflow-x:clip;min-height:calc(100vh - var(--hdr));min-height:calc(100svh - var(--hdr));--hx-ink: oklch(.9 .02 226);--hx-bg: var(--bg);--hx-wall: oklch(.47 .04 240);--hx-sw: 2px;--sludge: oklch(.44 .05 55);--w0: oklch(.56 .1 40);--w1: oklch(.57 .085 50);--w2: oklch(.6 .065 70);--w3: oklch(.645 .035 112);--w4: oklch(.69 .045 196);--w5: oklch(.76 .105 224);--w6: oklch(.81 .12 226);--h1-in: oklch(.7 .11 45);--h1-out: oklch(.84 .115 226);--mark: oklch(.88 .11 172);--mark-ink: oklch(.22 .04 220)}.hero-in{flex:1;width:100%;display:grid;grid-template-columns:minmax(0,1fr) 360px;grid-template-rows:1fr auto;column-gap:56px;padding-top:clamp(28px,5.5svh,60px);padding-bottom:clamp(20px,3.6svh,36px);--ich: clamp(86px, 12.5svh, 112px);--icw: calc(var(--ich) * 1.2);--py: calc(var(--ich) * .72);--pw: 18px;--pwi: 10px;--lead: clamp(28px, 5svh, 52px)}.hero-copy{grid-area:1 / 1;align-self:center;padding-bottom:20px;margin-bottom:7svh;margin-bottom:calc(7svh + max(0px,100svh - 900px)/2)}.eyebrow{font-size:var(--fs-xs);font-weight:500;color:var(--muted);letter-spacing:.14em}h1{font-family:Noto Sans TC,PingFang TC,Microsoft JhengHei,sans-serif;font-size:3rem;font-size:clamp(3rem,calc(1.2rem + min(5.4vw,8.4svh)),5.75rem);font-weight:500;line-height:1.08;margin:14px 0 22px;letter-spacing:0}.h1-g{display:inline-block;white-space:nowrap}.h1-k{font-size:.42em;font-weight:500;vertical-align:.62em;margin-right:.1em;color:var(--muted);letter-spacing:.04em}.h1-n{font-family:var(--mono);font-weight:500;letter-spacing:-.02em;font-variant-numeric:tabular-nums}.h1-in{color:var(--h1-in)}.h1-out{color:var(--h1-out)}.h1-to{font-family:var(--mono);font-size:.5em;vertical-align:.32em;margin:0 .12em 0 .02em;color:var(--muted)}.h1-u{font-family:var(--mono);font-size:var(--fs-xl);font-weight:500;color:var(--muted);letter-spacing:0;margin-left:.1em}.lede{font-size:var(--fs-m);max-width:34em}.rule{margin-top:18px;font-size:var(--fs-m);line-height:1.9}.rule mark{display:inline-block;max-width:100%;background:var(--mark);color:var(--mark-ink);padding:.1em .45em;border-radius:2px;line-height:1.6;font-weight:600}.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;margin-top:26px}.tlink{display:inline-flex;align-items:center;min-height:44px;color:var(--ink);font-weight:600;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:.3em}@media(hover:hover)and (pointer:fine){.tlink:hover{text-decoration-thickness:3px}}.flow{grid-area:2 / 1 / 3 / 3;list-style:none;margin:0;padding:0;display:flex;--pdir: 90deg}.fl{position:relative;flex:1 1 0;min-width:0;display:flex;justify-content:center;--lvl: 1}.fl-in{flex:0 0 168px}.fl-out{flex:0 0 104px}.fl-0{--i: 0;--wp: var(--w0);--w: var(--w0);--wn: var(--w1)}.fl-1{--i: 1;--wp: var(--w0);--w: var(--w1);--wn: var(--w2)}.fl-2{--i: 2;--wp: var(--w1);--w: var(--w2);--wn: var(--w3)}.fl-3{--i: 3;--wp: var(--w2);--w: var(--w3);--wn: var(--w4)}.fl-4{--i: 4;--wp: var(--w3);--w: var(--w4);--wn: var(--w5)}.fl-5{--i: 5;--wp: var(--w4);--w: var(--w5);--wn: var(--w6)}.fl-6{--i: 6;--wp: var(--w5);--w: var(--w6);--wn: var(--w6)}.fl-7{--i: 7;--wp: var(--w6);--w: var(--w6);--wn: var(--w6)}.fl-a{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:12px;color:inherit;text-decoration:none;border-radius:var(--r1)}.hx{display:block;flex:none;width:var(--icw);height:var(--ich);overflow:visible}.hx-gap{width:1px}.fl-lab{display:flex;align-items:center;gap:8px}.fl-tag{background:linear-gradient(var(--bg) 50%,color-mix(in oklab,var(--w) 42%,var(--bg)) 50%)}.fl-t{display:flex;flex-direction:column;line-height:1.4}.fl-n{font-size:var(--fs-s);font-weight:600;white-space:nowrap}.fl-d{display:none}@media(hover:hover){a.fl-a:hover .fl-n{text-decoration:underline;text-underline-offset:.25em}}.pipe{position:absolute;z-index:0;left:0;right:0;top:calc(var(--py) - var(--pw) / 2);height:var(--pw);background:var(--hx-wall)}.pipe:before{content:"";position:absolute;inset:calc((var(--pw) - var(--pwi)) / 2) 0;background:linear-gradient(var(--pdir),color-mix(in oklab,var(--wp),var(--w)),var(--w) 50%,color-mix(in oklab,var(--w),var(--wn)))}.fl-in .pipe{left:50%}.fl-in .pipe:after{content:"";position:absolute;right:100%;top:0;bottom:0;width:16px;background:var(--hx-wall);clip-path:polygon(0 calc(50% - 1px),100% 0,100% 100%,0 calc(50% + 1px))}.fl-in:before{content:"";position:absolute;left:-100vw;right:calc(50% + 16px);top:calc(var(--py) - 1px);height:2px;background:var(--w0)}.fl-out .pipe{right:-100vw}.fl-out .pipe:after{content:"";position:absolute;left:30px;top:50%;width:18px;height:24px;translate:0 -50%;background:var(--hx-ink);clip-path:polygon(0 0,100% 50%,0 100%)}.fl-6:after{content:"";position:absolute;z-index:2;left:calc(50% - 1px);top:calc(-1 * var(--lead));height:calc(var(--lead) + var(--ich) * .03);border-left:2px dashed var(--hx-ink)}.fl-6:before{content:"";position:absolute;z-index:2;left:calc(50% - 4px);top:calc(-1 * var(--lead) - 4px);width:8px;height:8px;border-radius:50%;background:var(--hx-ink)}.note{grid-area:1 / 2;align-self:end;position:relative;margin:0 0 var(--lead);background:var(--panel);border:1px solid var(--rule);border-radius:var(--r2);padding:16px 18px 14px}.note-h{display:flex;flex-wrap:wrap;align-items:baseline;gap:2px 8px;font-size:var(--fs-s);padding-bottom:10px;border-bottom:1px solid var(--rule)}.note-k{font-weight:600}.note-h .lim{margin-left:auto;font-size:var(--fs-s);color:var(--muted)}.note .num{font-family:var(--mono);font-weight:500;letter-spacing:0}.note-ab{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);padding:12px 0 14px}.note .m{margin:0;display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-areas:"k k" "v st" "bar bar";gap:0 8px;align-items:baseline}.note .m+.m{border-left:1px solid var(--line);padding-left:16px;margin-left:16px}.note .m-k{grid-area:k;font-size:var(--fs-s);color:var(--muted)}.note .m-k .mono{color:var(--ink)}.note .m-val{grid-area:v;font-size:var(--fs-xl);line-height:1.35}.note .m-st{grid-area:st;justify-self:start}.note .m-bar{grid-area:bar;margin-top:6px}.note-say{font-size:var(--fs-s);line-height:1.6}.note-foot{margin-top:8px;padding-top:8px;border-top:1px solid var(--line);font-size:var(--fs-s);color:var(--muted);line-height:1.5}@media(prefers-reduced-motion:no-preference){.fl{animation:lvl-in .6s var(--ease-out) calc(.3s + var(--i) * .22s) both}.pipe:before{animation:pipe-x .24s linear calc(.18s + var(--i) * .22s) both}.fl-in:before{animation:pipe-x .3s var(--ease-out) both}.note,.fl-6:before,.fl-6:after{animation:fade-up .45s var(--ease-out) 1.55s both}}@keyframes lvl-in{0%{--lvl: 0}}@keyframes pipe-x{0%{clip-path:inset(0 100% 0 0)}}@keyframes pipe-y{0%{clip-path:inset(0 0 100% 0)}}@keyframes fade-up{0%{opacity:0;translate:0 6px}}.m-bar{position:relative;display:block;height:8px;background:var(--track);border-radius:2px}.m-bar i{position:absolute;inset:0 auto 0 0;width:calc(min(var(--v) / var(--max),1)*100%);min-width:3px;background:var(--ok-fill);border-radius:2px}.m-bar b{position:absolute;top:-4px;bottom:-4px;left:calc(var(--lim) / var(--max) * 100%);width:2px;margin-left:-1px;background:var(--ink)}.m[data-state=high] .m-bar i{background:var(--alarm)}.m-st{font-size:var(--fs-s);color:var(--muted);white-space:nowrap}.m-st:before{content:"\2713  "}.m[data-state=high] .m-st{color:var(--alarm-ink);font-weight:600}.m[data-state=high] .m-st:before{content:"\25b2  "}.m[data-state=high] .m-val{color:var(--alarm-ink)}.stations{position:sticky;top:var(--hdr);z-index:20;background:var(--bg);border-block:1px solid var(--line)}.stations-in{display:flex;align-items:center;gap:16px;min-height:var(--bar)}.stations-k{font-size:var(--fs-s);color:var(--muted);flex:none}.stations-list{display:flex;gap:2px;list-style:none;margin:0;padding:0;flex:1;min-width:0}.stations-list a{display:flex;align-items:center;gap:8px;padding:6px 10px 6px 6px;border-radius:var(--r1);text-decoration:none;font-size:var(--fs-s);transition:background-color var(--dur-hover) var(--ease-out)}@media(hover:hover){.stations-list a:hover{background:var(--panel)}}.stations-list a[aria-current]{background:var(--panel)}.stations-list a[aria-current] .tag{border-color:var(--water);background:linear-gradient(var(--bg) 50%,var(--water-soft) 50%)}.tag-xs{width:38px;height:38px;font-size:var(--fs-s)}.tag-xs b{padding-bottom:2px}.tag-xs i{padding-top:2px}.tag-xs:after{border-top-width:1px}.stations-now{display:none;font-size:var(--fs-s);gap:8px;align-items:baseline;flex:1;min-width:0}.stations-now .mono{color:var(--muted)}.flow-ctrl{display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:0 14px;border:1px solid var(--rule);border-radius:var(--r1);background:var(--bg);color:var(--ink);font:inherit;font-size:var(--fs-s);cursor:pointer;flex:none;transition:background-color var(--dur-hover) var(--ease-out)}@media(hover:hover){.flow-ctrl:hover{background:var(--panel)}}.flow-ctrl svg{width:14px;height:14px;fill:currentColor}.flow-ctrl 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2}}@media(max-width:380px){.brand-name{font-size:var(--fs-m)}}@media(max-width:360px){:root{--colgap: 10px}h1{font-size:2.5rem}.hero-in{grid-template-columns:92px minmax(0,1fr);column-gap:10px;--icw: 54px;--ich: 45px;--px: 27px}.note .m{grid-template-areas:"k k" "v v" "st st" "bar bar"}}@media(max-width:720px)and (prefers-reduced-motion:no-preference){.pipe:before,.fl-in:before{animation-name:pipe-y}}@media(prefers-contrast:more){:root{--muted: var(--ink);--line: var(--rule)}}