.wht-app{--navy:#0b2239;--orange:#e96b0c;--blue:#1f5d99;--green:#2f7d32;--border:#d9e1e8;--bg:#f4f7f9;max-width:980px;margin:0 auto;font-family:Arial,Helvetica,sans-serif;color:#142033}.wht-app *{box-sizing:border-box}.wht-header{background:var(--navy);color:#fff;padding:28px;border-radius:18px;margin-bottom:16px}.wht-header h1{margin:4px 0 8px;font-size:34px}.wht-header p{margin:0;max-width:700px}.wht-kicker{font-size:12px;font-weight:700;letter-spacing:.12em;color:#ffc27d}.wht-card{background:#fff;border:1px solid var(--border);border-radius:18px;padding:20px;margin:14px 0;box-shadow:0 4px 16px rgba(10,35,60,.06)}.wht-card h2{margin:0 0 12px}.wht-card p{color:#607080}.wht-grid-2,.wht-grid-3{display:grid;gap:12px}.wht-grid-2{grid-template-columns:repeat(2,1fr)}.wht-grid-3{grid-template-columns:repeat(3,1fr)}.wht-big,.wht-pump,.wht-actions button{border:2px solid var(--border);background:#fff;border-radius:14px;padding:16px;text-align:left;cursor:pointer;transition:.15s}.wht-big:hover,.wht-pump:hover,.wht-actions button:hover{transform:translateY(-1px);border-color:#9fb3c7}.wht-big{display:flex;align-items:center;gap:14px}.wht-big strong,.wht-pump strong,.wht-actions strong{display:block;font-size:17px}.wht-big small,.wht-pump small,.wht-actions small{display:block;margin-top:4px;color:#667789}.wht-icon,.wht-pump span,.wht-actions span{font-size:30px}.wht-pump{text-align:center}.wht-pump.active{border-color:var(--orange);background:#fff8f2}.wht-section-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.wht-section-head p{margin:4px 0 0}.wht-secondary{border:1px solid #9fb3c7;border-radius:10px;background:#fff;padding:9px 13px;cursor:pointer}.wht-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:16px 0}.wht-actions button{text-align:center;min-height:105px}.wht-actions .wht-left{border-color:#b7d8c0}.wht-actions .wht-right{border-color:#b7d8c0}.wht-builder-wrap{background:var(--bg);border:1px solid var(--border);border-radius:16px;padding:16px;overflow:auto}.wht-builder{min-height:280px;display:flex;flex-direction:column;align-items:center;padding:8px 0;min-width:620px}.wht-source{font-size:36px;margin-bottom:4px}.wht-seg{position:relative;width:100%;display:flex;justify-content:center;min-height:78px}.wht-trunk{width:8px;background:#eab700;min-height:78px;border-radius:8px;position:relative}.wht-trunk:after{content:"100' 1½″";position:absolute;left:18px;top:28px;white-space:nowrap;font-size:13px;font-weight:700}.wht-y-row{width:100%;display:grid;grid-template-columns:minmax(210px,1fr) 56px minmax(210px,1fr);align-items:center;min-height:112px}.wht-y-center{height:100%;display:flex;align-items:center;justify-content:center;position:relative}.wht-y-center:before,.wht-y-center:after{content:"";position:absolute;left:24px;width:8px;background:#eab700;z-index:0}.wht-y-center:before{top:0;height:39px}.wht-y-center:after{bottom:0;height:39px}.wht-y-bar{position:absolute;left:-10px;right:-10px;height:8px;background:#eab700;border-radius:8px}.wht-y{width:38px;height:38px;border-radius:50%;background:#111;color:#ffd400;border:3px solid #ffd400;display:flex;align-items:center;justify-content:center;font-weight:800;z-index:2}.wht-side-branch{display:flex;align-items:center;position:relative;min-width:0}.wht-side-branch.left{flex-direction:row-reverse}.wht-side-branch .wht-branch-line{height:7px;background:#2d8b47;border-radius:7px;flex:1;min-width:90px}.wht-side-branch.left .wht-branch-line{margin-left:8px}.wht-side-branch.right .wht-branch-line{margin-right:8px}.wht-side-label{position:absolute;top:-23px;font-size:13px;font-weight:700}.wht-side-branch.left .wht-side-label{right:36%}.wht-side-branch.right .wht-side-label{left:36%}.wht-end-icon{font-size:27px;display:flex;align-items:center;gap:5px;min-width:105px}.wht-side-branch.left .wht-end-icon{flex-direction:row-reverse;text-align:right}.wht-end-icon small{font-size:11px;color:#607080;line-height:1.2}.wht-branch-empty{height:48px;display:flex;align-items:center;color:#9aa7b3;font-size:11px}.wht-branch-empty.left{justify-content:flex-end}.wht-branch-empty span{border-top:2px dashed #c8d0d8;width:72px;padding-top:4px;text-align:center}.wht-elevation{display:flex;gap:8px;align-items:center;font-weight:700;color:#6f42a6;margin:8px 0}.wht-placeholder{padding:50px 10px;text-align:center;color:#708090}.wht-results-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.wht-results-grid>div{background:var(--bg);border-radius:12px;padding:14px}.wht-results-grid span{display:block;font-size:13px;color:#627386;margin-bottom:5px}.wht-results-grid strong{font-size:21px}.wht-note{margin-top:12px;font-size:12px;color:#687789;line-height:1.45}.wht-order{white-space:pre-wrap;background:#0f1d2c;color:#fff;border-radius:14px;padding:18px;min-height:120px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.wht-print{width:100%;border:0;background:var(--navy);color:#fff;border-radius:12px;padding:14px;font-weight:700;cursor:pointer}@media(max-width:700px){.wht-header{border-radius:0;margin-left:-10px;margin-right:-10px}.wht-grid-2,.wht-grid-3{grid-template-columns:1fr}.wht-actions{grid-template-columns:repeat(2,1fr)}.wht-results-grid{grid-template-columns:1fr}.wht-card{padding:15px}.wht-header h1{font-size:28px}.wht-builder-wrap{margin-left:-6px;margin-right:-6px}.wht-builder{min-width:600px;transform-origin:top center}}@media print{body *{visibility:hidden}.wht-app,.wht-app *{visibility:visible}.wht-app{position:absolute;left:0;top:0;max-width:none}.wht-actions,.wht-template,.wht-secondary,.wht-print{display:none!important}.wht-card{box-shadow:none;break-inside:avoid}}
/* v0.3 single-branch gated Y */
.wht-y-row.single .wht-y-center{min-height:112px}.wht-y-row.single .wht-y-bar{width:55px;right:auto;left:auto}.wht-y-row.single.left .wht-y-bar{left:-28px}.wht-y-row.single.right .wht-y-bar{right:-28px}.wht-continue{position:absolute;top:78px;left:50%;transform:translateX(-50%);font-size:10px;color:#7a8793;white-space:nowrap}.wht-y-row.single>div:empty{min-width:0}
/* v0.4 pump-first flow, quick-start seeds, nozzle/drop icons */
.wht-step-title{display:flex;align-items:center;gap:10px}.wht-step-title h2{margin:0}.wht-step-num{width:34px;height:34px;border-radius:50%;background:var(--navy);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;flex:0 0 34px}.wht-step-help{margin:6px 0 14px}.wht-attention{animation:whtPulse .9s ease}.wht-attention .wht-pump{border-color:var(--orange);box-shadow:0 0 0 3px rgba(233,107,12,.14)}@keyframes whtPulse{0%,100%{transform:scale(1)}50%{transform:scale(1.01)}}
.wht-nozzle-symbol{display:inline-flex;align-items:center;justify-content:center;transform:rotate(-8deg);font-size:34px!important;color:#20384e}.wht-nozzle-icon{display:inline-flex;align-items:center;height:28px;min-width:48px;position:relative}.wht-nozzle-tip{width:0;height:0;border-top:8px solid transparent;border-bottom:8px solid transparent;border-right:14px solid #263746}.wht-nozzle-body{width:22px;height:12px;background:#263746;border-radius:2px}.wht-nozzle-coupling{width:9px;height:18px;border:3px solid #263746;border-radius:2px;margin-left:1px}.wht-water-drop{font-size:30px;line-height:1}.wht-end-icon small b{color:#263746;font-size:11px;letter-spacing:.02em}
@media(max-width:700px){.wht-step-title{align-items:flex-start}.wht-step-num{margin-top:1px}}

/* v0.5 NWCG baseline cards, clearer status, educational math */
.wht-pump em,.wht-pump b,.wht-pump i{display:block;font-style:normal}.wht-pump em{margin-top:10px;padding-top:9px;border-top:1px solid #e4e9ee;color:#667789;font-size:11px;text-transform:uppercase;letter-spacing:.05em}.wht-pump b{font-size:14px;margin-top:3px;color:#12283e}.wht-pump i{font-size:10px;color:#768696;margin-top:3px}.wht-pump-icon{display:block}.wht-key-result{border:2px solid #b7c9d9}.wht-key-result strong{font-size:24px!important;color:var(--navy)}.wht-key-result small{display:block;margin-top:7px;color:#617386;line-height:1.35}.wht-math-toggle{width:100%;border:0;background:var(--navy);color:#fff;border-radius:14px;padding:17px 18px;display:grid;grid-template-columns:auto 1fr;column-gap:12px;text-align:left;cursor:pointer}.wht-math-toggle>span{grid-row:1/3;font-size:28px}.wht-math-toggle strong{font-size:18px}.wht-math-toggle small{margin-top:3px;color:#cfdae4}.wht-math-panel{margin-top:14px}.wht-math-intro{background:#eef5fb;border-radius:12px;padding:13px 15px;display:flex;flex-direction:column;gap:3px}.wht-math-intro span{font-size:12px;color:#5d7081}.wht-math-section{margin-top:18px;border-top:1px solid #e1e6ea;padding-top:14px}.wht-math-section h3{margin:0 0 10px;font-size:16px}.wht-math-row,.wht-math-total{display:flex;justify-content:space-between;gap:20px;padding:8px 0;border-bottom:1px dashed #d9e0e6}.wht-math-row span,.wht-math-total span{color:#55697b}.wht-math-total{margin-top:4px;border-bottom:0;background:#f5f8fa;border-radius:10px;padding:10px 12px}.wht-standard-box{display:flex;flex-direction:column;gap:4px;background:#fff8ef;border:1px solid #f2d0ad;border-radius:10px;padding:12px}.wht-standard-box span{font-size:12px;color:#6a7580}.wht-equation{margin-top:12px;padding:12px;background:#0f1d2c;color:#fff;border-radius:10px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;overflow:auto}.wht-formula-note{display:block;margin-top:8px;color:#778797}.wht-study-note{margin-top:18px;padding:13px;border-left:4px solid var(--orange);background:#fff7ef;font-size:12px;line-height:1.5;color:#576879}.wht-math-empty{padding:22px;text-align:center;color:#718091}.wht-seg{position:relative}.wht-seg>span{position:absolute;left:50%;transform:translateX(18px);top:42%;font-size:11px;color:#6c7c89;white-space:nowrap}