:root{--ink:#21373c;--muted:#6e7f82;--teal:#176873;--teal-dark:#10505a;--border:#dfe7e7;--paper:#f4f6f4;--water:#2f9dca;--pass:#256858;--red:#9b443a;--amber:#8a6325;font-family:"Segoe UI","Microsoft JhengHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,summary,select,input[type=range]{cursor:pointer}a{color:var(--teal)}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #63b3c4;outline-offset:4px}button{color:inherit}h1,h2,h3,p{margin:0}button{touch-action:manipulation}[hidden]{display:none!important}
.topbar{height:78px;padding:0 max(28px,calc((100vw - 1320px)/2));display:flex;align-items:center;justify-content:space-between;gap:20px;background:#fff;border-bottom:1px solid var(--border)}.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:19px;letter-spacing:.04em;text-decoration:none;color:var(--ink);white-space:nowrap}.brand-icon{width:35px;height:35px;border-radius:10px;background:var(--teal);color:#fff;font-size:31px;font-weight:400;line-height:27px;text-align:center}.brand-sub{font-size:10px;font-weight:500;letter-spacing:.16em;color:#8d9b9b;margin-left:14px}.top-actions{display:flex;gap:23px;align-items:center}.local-badge{font-size:12px;color:var(--muted);display:flex;gap:7px;align-items:center}.local-badge i{width:6px;height:6px;border-radius:50%;background:#52a18b}.quiet-button{background:transparent;border:1px solid var(--border);border-radius:6px;padding:8px 13px;font-size:12px}.quiet-button:hover{border-color:var(--teal);color:var(--teal)}main{max-width:1320px;padding:0 28px;margin:auto}.intro{display:flex;align-items:center;justify-content:space-between;padding:40px 0 31px;gap:18px}.eyebrow{color:var(--teal);font-size:10px;font-weight:700;letter-spacing:.18em;margin-bottom:12px}h1{font-size:31px;letter-spacing:.025em;font-weight:650;line-height:1.5}.intro-description{font-size:14px;color:var(--muted);margin-top:6px}.unit-note{border-left:1px solid #ccd8d8;padding:4px 0 4px 22px;display:flex;flex-direction:column;gap:5px}.unit-note span{font-size:10px;color:var(--muted)}.unit-note strong{font-size:18px;font-weight:500;letter-spacing:.06em}
.workspace{display:grid;grid-template-columns:350px minmax(0,1fr);gap:23px;align-items:start}.panel{background:#fff;border:1px solid var(--border);border-radius:11px;box-shadow:0 3px 9px #16323703}.input-panel{padding:23px 23px 26px}.panel-heading{display:flex;justify-content:space-between;align-items:center;gap:12px}h2{font-size:15px;font-weight:650;display:flex;align-items:center;gap:10px}.step{color:#7c9d9f;font-size:11px;font-weight:600;letter-spacing:.08em}.small-label{font-size:10px;color:#8b999b}.shapes{border:0;margin:24px 0 0;padding:0;min-width:0}.shapes legend,.field label{display:block;font-size:12px;font-weight:600;margin-bottom:8px}.shape-options{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}.shape-button{border:1px solid var(--border);border-radius:7px;background:white;display:flex;align-items:center;flex-direction:column;justify-content:center;gap:5px;padding:12px 3px 10px;font-size:11px;transition:background .15s,border-color .15s}.shape-button svg{width:40px;height:34px;fill:none;stroke:#7f9295;stroke-width:2;stroke-linejoin:round}.shape-button.active{border-color:var(--teal);background:#edf6f5;color:var(--teal);box-shadow:inset 0 0 0 .4px var(--teal)}.shape-button.active svg{stroke:var(--teal)}.shape-button:hover{background:#f3f8f8}.field-hint{font-size:10px;line-height:1.8;color:#7c8c8f}.shape-description{min-height:35px;margin:10px 0 15px}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:13px}.field-row.single{grid-template-columns:1fr}.field{margin-bottom:17px;min-width:0}.label-unit{color:#829396;font-size:10px;font-weight:400}input[type=number],select{display:block;width:100%;min-width:0;border:1px solid #d6e0e1;border-radius:6px;background:#fff;color:var(--ink);font-size:14px;min-height:42px;padding:9px 11px;outline:none;font-variant-numeric:tabular-nums}input[type=number]:focus,select:focus{border-color:#328c96;box-shadow:0 0 0 3px #228a9412}input[aria-invalid=true]{border-color:#b04e40;background:#fff8f6}.input-unit{position:relative}.input-unit input{padding-right:40px}.input-unit>span{position:absolute;right:11px;top:13px;color:#85989b;font-size:11px;pointer-events:none}input::-webkit-inner-spin-button{opacity:0}.depth-block{margin-bottom:22px;padding:15px 15px 10px;border:1px solid #dcebea;border-radius:7px;background:#f4f9f8}.depth-block .field{display:flex;align-items:center;justify-content:space-between;margin-bottom:11px;gap:15px}.depth-block label{margin:0}.depth-input{width:110px}.depth-input input{color:var(--teal);font-weight:650;font-size:17px;min-height:39px}.depth-input>span{top:12px}input[type=range]{width:100%;height:5px;margin:10px 0 12px;accent-color:var(--teal)}.range-labels{display:flex;justify-content:space-between;font-size:10px;color:#7e9294}select{font-size:12px;padding-right:25px}.separator{height:1px;background:var(--border);margin:21px 0}.field-row+.field-hint{margin-top:-7px}.results-column{display:flex;flex-direction:column;gap:23px;min-width:0}.visual-panel{padding:21px 23px 0;overflow:hidden}.drawing-tag{font-size:11px;color:var(--teal);background:#edf5f4;padding:5px 10px;border-radius:4px}.drawing-container{margin:2px -12px -2px;min-height:250px}#section-drawing{display:block;width:100%;height:auto;max-height:365px}#section-drawing text{font-family:"Segoe UI","Microsoft JhengHei",sans-serif;font-size:12px;fill:#6e858c;font-variant-numeric:tabular-nums}#section-drawing .dim-label{font-size:13px;fill:#52777c}#section-drawing .water-label{fill:#2789b3;font-size:13px;font-weight:600}#section-drawing .limit-label{fill:#9b8557;font-size:11px}.drawing-footer{border-top:1px solid #edf1f1;display:flex;justify-content:space-between;gap:12px;align-items:center;padding:13px 0;font-size:10px;color:#8a989b}.legend{display:flex;gap:15px}.legend>span{display:flex;align-items:center;gap:6px;white-space:nowrap}.legend i{width:13px;height:8px;display:inline-block}.water-key{background:#8fd0e8;border:1px solid #75b9d2}.legend .limit-key{height:0;border-top:1px dashed #b49964}.depth-summary{display:flex;gap:20px;align-items:center;background:#f7faf9;border-top:1px solid #e9efed;margin:0 -23px;padding:14px 23px}.depth-summary>div:first-child{display:flex;flex-direction:column;gap:5px;flex-shrink:0}.depth-summary span{font-size:10px;color:#889899}.depth-summary strong{font-size:13px;font-weight:600;font-variant-numeric:tabular-nums}.depth-track{height:4px;flex:1;background:#dce9e8;border-radius:3px;overflow:hidden}.depth-track>span{display:block;height:100%;background:#469aa1}.depth-summary b{font-size:12px;color:#5b8184;font-weight:500;min-width:40px;text-align:right;font-variant-numeric:tabular-nums}
.result-title{display:flex;justify-content:space-between;align-items:center;margin:0 0 14px}.result-title>span{font-size:10px;color:#879698}.status-card{border:1px solid #cfdfd8;background:#edf5f0;border-radius:8px;padding:16px;display:flex;align-items:center;gap:12px;color:var(--pass)}.status-card.fail{background:#fcf0ec;border-color:#eed6ce;color:var(--red)}.status-card.warn{background:#fcf7e9;border-color:#e9dfc5;color:var(--amber)}.status-icon{width:29px;height:29px;border:1px solid currentColor;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:17px;flex-shrink:0}.status-card h3{font-size:14px;font-weight:600;line-height:1.6}.status-card p{font-size:11px;line-height:1.7;opacity:.85;margin-top:4px}.status-pill{white-space:nowrap;font-size:10px;border:1px solid currentColor;opacity:.8;border-radius:4px;padding:5px 8px;margin-left:auto}.metric-grid{display:grid;grid-template-columns:1.35fr repeat(4,1fr);margin:16px 0;background:#fff;border:1px solid var(--border);border-radius:8px;padding:19px 0;overflow:hidden}.metric{padding:0 14px;border-right:1px solid #e7eded;min-width:0}.metric:last-child{border:0}.metric>span{display:block;font-size:10px;color:#829295;margin-bottom:12px;white-space:nowrap}.metric>div{display:flex;align-items:baseline;gap:5px;flex-wrap:wrap}.metric strong{font-size:21px;font-weight:500;letter-spacing:-.025em;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.metric small{font-size:10px;color:#8b9b9d}.metric.primary strong{color:var(--teal);font-weight:650}.normal-panel{padding:16px 18px;display:flex;align-items:center;justify-content:space-between;gap:15px}.normal-panel h3{font-size:12px;font-weight:600}.normal-panel p{font-size:10px;color:var(--muted);line-height:1.8;margin-top:6px;max-width:400px}#normal-results{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end;min-width:130px}.normal-result{display:flex;align-items:center;gap:9px;background:#f2f7f6;padding:8px 10px;border-radius:6px}.normal-result strong{font-size:17px;color:var(--teal);font-weight:500;font-variant-numeric:tabular-nums}.normal-result small{font-size:10px;color:var(--muted)}.normal-result button{border:0;border-bottom:1px solid #9ebfbe;padding:0 0 2px;background:none;color:var(--teal);font-size:10px}.normal-result.limited{background:#fbf3e7}.normal-result.limited strong{color:var(--amber)}.capacity-note{font-size:10px;line-height:1.8;color:#879697;margin:10px 3px 0}#input-error{padding:20px;border:1px solid #e3bdb3;border-radius:8px;background:#fcf0ec;color:var(--red);font-size:13px;line-height:1.8}
.method-panel{margin:26px 0 0;padding:0 23px}summary{display:flex;justify-content:space-between;gap:15px;padding:19px 0;font-size:12px;font-weight:600;list-style:none}summary::-webkit-details-marker{display:none}.summary-hint{font-size:10px;color:#8a999b;font-weight:400}.summary-hint b{margin-left:16px}details[open] .summary-hint b{display:inline-block;transform:rotate(45deg)}.method-content{border-top:1px solid var(--border);padding:22px 0;display:grid;grid-template-columns:1fr 1fr;gap:22px 35px}.method-content h3{font-size:12px;font-weight:600;margin-bottom:12px}.method-content p,.source-list li{font-size:11px;color:var(--muted);line-height:1.9;margin-bottom:8px}.method-content .formula{color:var(--teal);font-size:15px;padding:12px 0}.source-list{grid-column:1/-1;border-top:1px solid var(--border);padding-top:18px}.source-list ol{padding-left:20px;margin-bottom:0}footer{display:flex;justify-content:space-between;gap:15px;color:#93a0a0;font-size:10px;padding:23px 0 30px}
@media(min-width:1450px){main{max-width:1390px}.workspace{grid-template-columns:365px minmax(0,1fr)}.topbar{padding:0 max(28px,calc((100vw - 1334px)/2))}.drawing-container{margin-top:4px}#section-drawing{max-height:380px}.input-panel{padding:25px}.metric strong{font-size:25px}}
@media(max-width:1050px){.brand-sub{display:none}.workspace{grid-template-columns:320px minmax(0,1fr);gap:18px}.input-panel{padding:20px}.visual-panel{padding:20px 17px 0}.depth-summary{margin:0 -17px;padding:14px 17px}.metric-grid{grid-template-columns:repeat(3,1fr);gap:18px 0}.metric:nth-child(3){border:0}.metric>span{margin-bottom:6px}.status-pill{display:none}.drawing-footer{align-items:flex-start;flex-direction:column;gap:9px}.normal-panel{align-items:flex-start;flex-direction:column}#normal-results{justify-content:flex-start}.depth-summary{gap:10px}.drawing-container{min-height:0}.result-title>span{font-size:9px}h1{font-size:28px}}
@media(max-width:760px){.topbar{height:65px;padding:0 20px}.top-actions{gap:10px}.local-badge{font-size:10px}.brand{font-size:16px;gap:8px}.brand-icon{width:30px;height:30px;font-size:27px;line-height:24px}.quiet-button{padding:7px 9px;font-size:10px}main{padding:0 18px}.intro{padding:28px 0 24px}.eyebrow{font-size:9px;letter-spacing:.1em}h1{font-size:25px}.intro-description{font-size:12px}.unit-note{display:none}.workspace{grid-template-columns:1fr;gap:20px}.input-panel{padding:20px}.shape-description{min-height:0;margin-bottom:16px}.shape-button{padding:9px 5px}.shape-button svg{height:30px}.shapes{margin-top:20px}.field-hint{font-size:11px}.field-row+.field-hint{margin-top:-5px}.depth-block{margin-bottom:18px}.field{margin-bottom:16px}.results-column{gap:20px}.visual-panel{padding-top:19px}.metric-grid{grid-template-columns:repeat(3,1fr)}.metric>span{font-size:10px}.metric strong{font-size:24px}.drawing-footer{flex-direction:row;flex-wrap:wrap;align-items:center}.drawing-footer>span{font-size:9px}.depth-summary>div:first-child{min-width:130px}.result-title>span{font-size:9px}.method-content{grid-template-columns:1fr;gap:20px}.method-content p,.source-list li{font-size:12px}.source-list{grid-column:auto}.summary-hint{font-size:9px}.summary-hint b{margin-left:5px}footer{font-size:9px}.status-card h3{font-size:13px}.status-card p{font-size:11px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
@media(max-width:760px){#section-drawing{max-height:none}#section-drawing text,#section-drawing .dim-label,#section-drawing .water-label{font-size:16px}#section-drawing .limit-label{font-size:14px}}
.material-reference{margin-top:10px;padding:10px 11px;background:#f6f9f8;border-radius:6px;border:1px solid #e8eeeb}.material-reference .field-hint{font-size:10px}.material-reference a{display:block;font-size:10px;line-height:1.7;margin-top:6px;text-decoration:none;overflow-wrap:anywhere}.material-reference a:hover{text-decoration:underline}.material-values{display:flex;gap:5px;flex-wrap:wrap;margin:6px 0}.material-values button{border:1px solid #d7e2df;background:white;border-radius:4px;padding:5px 6px;color:#607b7b;font-size:10px}.material-values button.chosen{border-color:#5b9b96;color:#176873;background:#edf6f3}#material-note:empty,.material-values:empty{display:none}@media(max-width:760px){.material-reference .field-hint,.material-reference a,.material-values button{font-size:11px}}
.calculation-check{border:1px solid #e0e8e6;border-radius:7px;background:#fff;margin-top:13px;padding:0 15px}.calculation-check summary{padding:13px 0;font-size:11px;color:#577b7c}.calculation-check summary span{font-size:12px;color:#93aaa8}#calculation-substitution{border-top:1px solid #e5ece9;padding:11px 0 6px}#calculation-substitution p{font-size:11px;line-height:1.9;color:#748788;margin-bottom:5px;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}@media(max-width:760px){#calculation-substitution p{font-size:12px}}
.flow-panel{padding:17px 18px;margin-top:14px}.flow-panel h3{font-size:12px;font-weight:600}.flow-basis{font-size:10px;line-height:1.8;color:#7d9192;margin:7px 0 14px}.flow-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px;border-top:1px solid #e5edeb;padding-top:14px}.flow-grid>div{display:flex;flex-direction:column;gap:6px}.flow-grid span{font-size:11px;color:#7c9091}.flow-grid strong{font-size:23px;font-weight:500;color:#216b73;font-variant-numeric:tabular-nums}.flow-grid small{font-size:10px;color:#728786;line-height:1.7}.flow-grid button{align-self:flex-start;background:#edf6f3;border:1px solid #c9dfd8;border-radius:4px;color:#176873;padding:5px 8px;font-size:10px}.flow-panel>.field-hint{margin-top:13px}.export-bar{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:15px}.export-bar>span{font-size:11px;color:#7a8e90;margin-right:auto}.export-bar button{background:white;color:#176873}.export-bar button:disabled{opacity:.4;cursor:not-allowed}@media(max-width:760px){.flow-basis,.flow-grid small,.flow-panel>.field-hint{font-size:11px}.flow-grid{gap:12px}.flow-grid strong{font-size:22px}.export-bar>span{width:100%;margin:0 0 3px}.export-bar .quiet-button{font-size:12px;padding:10px 12px}}
#section-drawing.compact-drawing{max-height:none}#section-drawing.compact-drawing text,#section-drawing.compact-drawing .dim-label,#section-drawing.compact-drawing .water-label{font-size:16px}#section-drawing.compact-drawing .limit-label{font-size:14px}