/* Shared look for the single-page calculators (pump, weir, hydropower); mirrors the hydraulic tool. */
:root{--ink:#21373c;--muted:#56696c;--teal:#176873;--teal-dark:#10505a;--border:#dfe7e7;--paper:#f4f6f4;--pass:#256858;--red:#9b443a;--amber:#8a6325;font-family:"Segoe UI","Microsoft JhengHei",sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}
body{margin:0;background:var(--paper)}
button,input,select{font:inherit;color:inherit}
h1,h2,h3,p{margin:0}
a{color:var(--teal)}
[hidden]{display:none!important}
button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #63b3c4;outline-offset:3px}
.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:20px;font-weight:600;display:grid;place-items:center}
.top-actions{display:flex;gap:18px;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:#fff;border:1px solid var(--border);border-radius:6px;padding:8px 13px;font-size:12px;cursor:pointer;color:var(--teal)}
.quiet-button:hover{border-color:var(--teal)}
main{max-width:1320px;padding:0 28px;margin:auto}
.intro{padding:36px 0 26px}
.eyebrow{color:var(--teal);font-size:11px;font-weight:700;letter-spacing:.18em;margin-bottom:10px}
h1{font-size:30px;letter-spacing:.025em;font-weight:650;line-height:1.5}
.intro-description{font-size:14px;color:var(--muted);margin-top:6px}
.workspace{display:grid;grid-template-columns:370px 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;padding:22px}
.panel+.panel,.stack>.panel+.panel{margin-top:18px}
.stack{display:flex;flex-direction:column;gap:18px;min-width:0}
.stack>.panel+.panel{margin-top:0}
.panel-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px}
h2{font-size:15px;font-weight:650;display:flex;align-items:center;gap:10px}
h3{font-size:13px;font-weight:650}
.step{color:#5b7f82;font-size:11px;font-weight:600;letter-spacing:.08em}
.field{margin-bottom:15px;min-width:0}
.field label,.field legend{display:block;font-size:12px;font-weight:600;margin-bottom:7px}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
input[type=number],input[type=text],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:40px;padding:8px 10px;outline:none;font-variant-numeric:tabular-nums}
select{font-size:13px}
input: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:52px}
.input-unit>span{position:absolute;right:10px;top:11px;color:var(--muted);font-size:12px;pointer-events:none}
.hint{font-size:12px;line-height:1.8;color:var(--muted);margin-top:5px}
.choice{display:grid;grid-template-columns:repeat(auto-fit,minmax(96px,1fr));gap:7px;margin-bottom:14px}
.choice button{border:1px solid var(--border);border-radius:7px;background:#fff;padding:10px 6px;font-size:12px;cursor:pointer;line-height:1.5}
.choice button[aria-pressed=true]{border-color:var(--teal);background:#edf6f5;color:var(--teal);box-shadow:inset 0 0 0 .4px var(--teal);font-weight:600}
.separator{height:1px;background:var(--border);margin:18px 0}
.status-card{border:1px solid #cfdfd8;background:#edf5f0;border-radius:8px;padding:14px 16px;color:var(--pass)}
.status-card.fail{background:#fcf0ec;border-color:#eed6ce;color:var(--red)}
.status-card.warn{background:#fcf7e9;border-color:#e9dfc5;color:#6b4c19}
.status-card strong{display:block;font-size:14px;font-weight:600}
.status-card p{font-size:12px;line-height:1.8;margin-top:3px}
.metric-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));background:#fff;border:1px solid var(--border);border-radius:8px;overflow:hidden}
.metric{padding:15px 16px;border-right:1px solid #e7eded;border-bottom:1px solid #e7eded;min-width:0}
.metric>span{display:block;font-size:12px;color:var(--muted);margin-bottom:6px;line-height:1.5}
.metric strong{font-size:22px;font-weight:550;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.metric small{font-size:12px;color:var(--muted);margin-left:4px}
.metric.primary strong{color:var(--teal);font-weight:650}
.formula-box{border:1px solid #dcebea;background:#f4f9f8;border-radius:8px;padding:14px 16px;font-size:12px;line-height:1.9;color:var(--muted)}
.formula-box .formula{display:block;color:var(--teal);font-size:15px;margin:2px 0 6px;font-variant-numeric:tabular-nums}
.formula-box b{color:var(--ink);font-weight:600}
.substitution p{font-size:12px;line-height:1.9;color:var(--muted);overflow-wrap:anywhere;font-variant-numeric:tabular-nums;margin-bottom:4px}
.notes{margin:0;padding-left:18px;font-size:12px;line-height:1.9;color:var(--muted)}
.notes li+li{margin-top:2px}
.warn-list{margin:10px 0 0;padding:10px 12px 10px 28px;border:1px solid #e9dfc5;border-left:3px solid var(--amber);border-radius:6px;background:#fcf7e9;color:#6b4c19;font-size:12px;line-height:1.8}
.source-list ol{margin:8px 0 0;padding-left:20px;font-size:12px;line-height:1.9;color:var(--muted)}
.source-list li+li{margin-top:4px}
details.panel>summary{cursor:pointer;font-size:13px;font-weight:600;list-style:none;display:flex;justify-content:space-between}
details.panel>summary::-webkit-details-marker{display:none}
details.panel[open]>summary{margin-bottom:12px}
.table-wrap{overflow:auto;border:1px solid var(--border);border-radius:8px}
table.data{border-collapse:collapse;width:100%;font-size:12px;font-variant-numeric:tabular-nums}
table.data th,table.data td{padding:8px 10px;border-bottom:1px solid #e7eded;text-align:right;white-space:nowrap}
table.data th{background:#f4f8f7;color:var(--muted);font-weight:600;position:sticky;top:0}
table.data th:first-child,table.data td:first-child{text-align:left}
table.data tr:last-child td{border-bottom:0}
footer{display:flex;justify-content:space-between;gap:15px;color:var(--muted);font-size:12px;padding:23px 0 30px}
@media(max-width:900px){.workspace{grid-template-columns:1fr;gap:18px}}
@media(max-width:760px){.topbar{height:64px;padding:0 18px}.brand{font-size:16px;gap:8px}.brand-icon{width:30px;height:30px;font-size:17px}.local-badge{display:none}main{padding:0 16px}.intro{padding:26px 0 20px}h1{font-size:24px}.intro-description{font-size:13px}.panel{padding:18px}.metric strong{font-size:20px}footer{flex-direction:column;gap:4px}}