:root{--bg:#f5f7f2;--ink:#17211b;--muted:#607067;--card:#fff;--line:#d9e1da;--green:#1d6b4f;--blue:#2f6c84;--warn:#b66a2c;--shadow:0 18px 50px rgba(29,54,40,.10);--r:22px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.58 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}a{color:var(--green);text-decoration-thickness:.08em;text-underline-offset:.18em}button,input,select{font:inherit}.wrap{width:min(1180px,calc(100% - 32px));margin:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;z-index:50;background:white;padding:10px 14px;border-radius:8px}.site-header{position:sticky;top:0;z-index:30;background:rgba(245,247,242,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(217,225,218,.8)}.nav{display:flex;align-items:center;justify-content:space-between;min-height:70px;gap:22px}.brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;font-weight:800}.brand-mark{width:34px;height:34px;border-radius:11px;background:linear-gradient(140deg,var(--green),#6cb58c);display:grid;place-items:center;color:#fff;font-weight:900}.nav-links{display:flex;gap:22px;align-items:center}.nav-links a{color:var(--ink);text-decoration:none;font-weight:650;font-size:.94rem}.menu{display:none;border:1px solid var(--line);background:white;border-radius:10px;padding:8px 11px}.hero{padding:72px 0 36px;background:radial-gradient(circle at 80% 10%,#dbeee4 0,transparent 35%),linear-gradient(180deg,#f7faf6,#f5f7f2)}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:44px;align-items:center}.eyebrow{display:inline-flex;gap:8px;align-items:center;padding:6px 10px;border-radius:999px;background:#e3f0e8;color:#245f49;font-size:.78rem;font-weight:800;letter-spacing:.05em;text-transform:uppercase}.hero h1,.page-hero h1{font-size:clamp(2.3rem,5vw,4.7rem);line-height:.98;letter-spacing:-.05em;margin:18px 0}.hero h1 span{color:var(--green)}.lead{font-size:1.16rem;color:var(--muted);max-width:720px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.btn{appearance:none;border:0;border-radius:13px;padding:13px 17px;background:var(--green);color:white;text-decoration:none;font-weight:800;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn:hover{background:#15573f}.btn.secondary{background:#fff;color:var(--ink);border:1px solid var(--line)}.hero-card,.panel,.card,.prose{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow)}.hero-card{padding:24px}.mini-plan{position:relative;aspect-ratio:4/3;border-radius:16px;overflow:hidden;background:linear-gradient(90deg,transparent 24px,#dce5dc 25px,transparent 26px),linear-gradient(transparent 24px,#dce5dc 25px,transparent 26px),#eef4ed;background-size:25px 25px}.mini-house{position:absolute;left:23%;top:24%;width:42%;height:35%;border-radius:8px;background:#58685f;border:4px solid #fff}.mini-wet{position:absolute;right:12%;bottom:18%;width:23%;height:18%;border-radius:50%;background:rgba(89,158,190,.34);border:2px dashed #39718a}.mini-route{position:absolute;left:62%;top:55%;width:30%;height:4px;background:var(--blue);transform:rotate(28deg);transform-origin:left center}.mini-route:after{content:"";position:absolute;right:-1px;top:-5px;border-left:9px solid var(--blue);border-top:7px solid transparent;border-bottom:7px solid transparent}.trust-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}.trust{padding:13px;background:#f3f7f3;border-radius:14px}.trust b{display:block}.section{padding:62px 0}.section.compact{padding:34px 0}.section h2{font-size:clamp(1.7rem,3vw,2.5rem);letter-spacing:-.03em;margin:0 0 12px}.section-intro{color:var(--muted);max-width:800px}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{padding:22px}.card h3{margin:8px 0}.icon{font-size:1.6rem}.planner-shell{display:grid;grid-template-columns:360px 1fr;gap:20px;align-items:start}.panel{padding:20px}.panel h3{margin:5px 0 14px}.field{display:grid;gap:6px;margin:0 0 13px}.field label{font-weight:750;font-size:.91rem}.field input,.field select{width:100%;border:1px solid var(--line);background:white;border-radius:11px;padding:11px 12px;color:var(--ink)}.field small,.help,.muted{color:var(--muted)}.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}.tabs{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:14px}.tool{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:11px;padding:9px 11px;font-weight:700;cursor:pointer}.tool.active{background:#e3f0e8;border-color:#8db8a0;color:#15573f}.site-plan{position:relative;overflow:hidden;border-radius:18px;border:1px solid #cdd9cf;background:#f0f5ef}.site-plan svg{display:block;width:100%;height:auto;touch-action:none}.plan-help{display:flex;justify-content:space-between;gap:12px;align-items:center;margin:8px 0 0;color:var(--muted);font-size:.86rem}.legend{display:flex;flex-wrap:wrap;gap:8px}.badge{display:inline-flex;align-items:center;gap:6px;padding:5px 9px;border-radius:999px;background:#eef3ef;font-size:.77rem;font-weight:700}.dot{width:9px;height:9px;border-radius:50%}.results{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}.metric{padding:15px;border-radius:15px;background:#f4f7f4;border:1px solid #e0e7e1}.metric small{display:block;color:var(--muted);font-weight:700}.metric strong{display:block;font-size:1.28rem;margin-top:3px}.scenario-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin-top:16px}.scenario{border:1px solid var(--line);border-radius:16px;padding:17px;background:#fff}.scenario.recommended{border:2px solid #6aa986;background:#f7fbf8}.scenario h4{margin:0 0 7px}.score{display:inline-flex;border-radius:999px;padding:4px 8px;background:#e7f1eb;color:#1b5e46;font-size:.76rem;font-weight:800}.notice{border-left:4px solid var(--warn);padding:12px 14px;background:#fff8f1;border-radius:10px;color:#6f4825}.formula{padding:16px;border-radius:14px;background:#17211b;color:#eaf3ed;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;overflow:auto}.page-hero{padding:60px 0 32px}.article{display:grid;grid-template-columns:minmax(0,760px) 1fr;gap:36px;align-items:start}.prose{padding:30px}.prose h2{margin-top:34px}.prose h3{margin-top:25px}.prose li{margin:7px 0}.toc{position:sticky;top:94px}.toc a:not(.btn){display:block;padding:7px 0}.toc a.btn{display:flex;width:100%;padding:13px 17px;margin:12px 0 5px;white-space:normal;text-align:center}.calc-box{padding:20px;background:#f3f7f3;border-radius:16px;margin:22px 0}.footer{margin-top:60px;background:#17211b;color:#dce8e0;padding:46px 0 24px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}.footer a{display:block;color:#dce8e0;margin:6px 0}.footer h3{color:white;margin-top:0}.footer-bottom{border-top:1px solid #344039;margin-top:30px;padding-top:20px;display:flex;justify-content:space-between;gap:16px;color:#9fb1a6}@media(max-width:900px){.hero-grid,.planner-shell,.article{grid-template-columns:1fr}.grid3,.scenario-grid{grid-template-columns:1fr}.results{grid-template-columns:1fr 1fr}.toc{position:static}.footer-grid{grid-template-columns:1fr 1fr}.nav-links{display:none;position:absolute;top:70px;left:16px;right:16px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:10px;box-shadow:var(--shadow)}.nav-links.open{display:grid}.nav-links a{padding:10px}.menu{display:block}}@media(max-width:560px){.wrap{width:min(100% - 20px,1180px)}.hero{padding-top:45px}.hero h1{font-size:2.65rem}.trust-row,.row2,.results,.footer-grid{grid-template-columns:1fr}.panel{padding:15px}.site-plan{margin-inline:-3px}.actions .btn{width:100%}.footer-bottom{display:block}}


:focus-visible{outline:3px solid #214f9a;outline-offset:3px}.tool:disabled{opacity:.45;cursor:not-allowed}.storm-presets{display:flex;flex-wrap:wrap;gap:7px;margin:-3px 0 15px}.storm-preset{border:1px solid var(--line);background:#f7faf7;border-radius:999px;padding:7px 10px;cursor:pointer;font-weight:750}.warning{margin-top:14px;padding:11px 13px;border-radius:12px;background:#fff0e5;border:1px solid #efc6a5;color:#70451f}.warning[hidden]{display:none}.site-plan g[data-id]{cursor:grab}.site-plan g[data-id][data-selected="true"]>:first-child,.site-plan g[data-id]:focus>:first-child{stroke:#17211b;stroke-width:5}.site-plan g[data-id]:active{cursor:grabbing}.tool-note{margin:10px 0 0;color:var(--muted);font-size:.86rem}.mini-tool{margin:24px 0;padding:20px;border:1px solid var(--line);border-radius:18px;background:#f6f9f6}.mini-tool h2,.mini-tool h3{margin-top:0}.tool-result{display:grid;gap:5px;margin-top:14px;padding:14px;border-radius:14px;background:#fff;border:1px solid var(--line)}.tool-result strong{font-size:1.08rem}.hub-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.hub-card{display:block;text-decoration:none;color:inherit}.hub-card p{color:var(--muted)}.hub-card span{font-weight:800;color:var(--green)}.field-check{display:flex;gap:10px;align-items:flex-start;margin:10px 0 16px}.field-check input{margin-top:4px}.metric-emphasis{font-size:1.2rem}.prose .mini-tool h2{margin-top:0}.prose .mini-tool h3{margin-top:0}.prose .mini-tool p:last-child{margin-bottom:0}
@media(max-width:900px){.hub-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.hub-grid{grid-template-columns:1fr}.tool,.storm-preset{min-height:44px}.plan-help{display:grid}.mini-tool{padding:15px}}
@media print{.site-header,.footer,.actions,.tabs,.storm-presets,.menu,.toc{display:none!important}.hero,.section{padding:16px 0}.panel,.card,.prose{box-shadow:none}.planner-shell{display:block}.site-plan{max-width:720px}}

.storm-ladder{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}.storm-step{padding:13px;border:1px solid var(--line);border-radius:14px;background:#f8faf8}.storm-step small{display:block;color:var(--muted);font-weight:750}.storm-step strong{display:block;margin-top:4px;font-size:1.08rem}.storm-step span{display:block;margin-top:2px;color:var(--muted);font-size:.78rem}@media(max-width:720px){.storm-ladder{grid-template-columns:1fr 1fr}}

.decision-table{display:grid;gap:0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}.decision-table>div{display:grid;grid-template-columns:minmax(180px,.8fr) 1.2fr;gap:18px;padding:13px 15px;border-bottom:1px solid var(--line)}.decision-table>div:last-child{border-bottom:0}.decision-table span{color:var(--muted)}@media(max-width:620px){.decision-table>div{grid-template-columns:1fr;gap:4px}}

.mitigation-box{margin-top:24px;padding:18px;border:1px solid #b8d2c2;border-radius:18px;background:#f4faf6}.mitigation-box h3{margin:0 0 8px}.mitigation-results{margin-top:12px}.mitigation-ladder{margin-top:14px}.mitigation-ladder .storm-step{background:#fff}.mitigation-ladder .storm-step strong{color:var(--green)}@media(max-width:560px){.mitigation-box{padding:14px}}

.route-breakdown{display:grid;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}.route-row{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:11px 13px;border-bottom:1px solid var(--line)}.route-row:last-child{border-bottom:0}.route-row span{display:flex;gap:3px;flex-wrap:wrap}.route-row small{color:var(--muted)}.route-row b{white-space:nowrap;color:var(--green)}.route-empty{padding:12px;color:var(--muted)}@media(max-width:520px){.route-row{align-items:flex-start}.route-row span{display:grid}.route-row small{display:block}}

.route-row{align-items:flex-start}.route-main{display:grid;gap:3px;min-width:150px}.route-measure{display:flex;align-items:end;gap:8px;flex-wrap:wrap;justify-content:flex-end}.route-measure label{display:grid;gap:4px;font-size:.78rem;color:var(--muted)}.route-measure input{width:100px;min-height:40px}.route-grade{min-width:118px;text-align:right}.route-grade strong{display:block}.route-grade small{display:block;color:var(--muted);white-space:normal}.project-brief-box{margin-top:24px;padding:18px;border:1px solid #b9c9bd;border-radius:18px;background:#f8faf7}.project-brief-box h3{margin:0 0 8px}.verification-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px 16px;margin:14px 0}.verification-grid label{display:flex;align-items:flex-start;gap:9px;padding:10px 11px;border:1px solid var(--line);border-radius:12px;background:#fff;font-weight:650}.verification-grid input{margin-top:3px}.brief-summary{display:grid;gap:4px;padding:13px 14px;border-radius:13px;background:#eef5f0}.brief-summary span{color:var(--muted)}.project-brief{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:12px}.brief-card{padding:12px;border:1px solid var(--line);border-radius:13px;background:#fff}.brief-card small{display:block;color:var(--muted);font-weight:750}.brief-card strong{display:block;margin-top:4px}.brief-card ul{margin:7px 0 0;padding-left:18px;color:var(--muted)}@media(max-width:720px){.verification-grid,.project-brief{grid-template-columns:1fr}.route-row{display:grid;gap:9px}.route-measure{justify-content:flex-start}.route-grade{text-align:left}}

.infiltration-readings{display:grid;gap:10px;margin:14px 0}.infiltration-reading{padding:13px;border:1px solid var(--line);border-radius:14px;background:#fff}.infiltration-reading>strong{display:block;margin-bottom:9px}.reading-rate{display:block;font-weight:800;color:var(--green);margin-top:2px}.infiltration-result span{display:block}.infiltration-result span+span{margin-top:5px}

.editorial-visual{margin:22px 0;border:1px solid var(--line);border-radius:22px;overflow:hidden;background:#eef4ed;box-shadow:var(--shadow)}
.editorial-visual img{display:block;width:100%;height:auto}
.visual-caption{padding:12px 16px;color:var(--muted);font-size:.88rem;background:#fff;border-top:1px solid var(--line)}
.explain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:20px}
.explain-step{padding:18px;border:1px solid var(--line);border-radius:16px;background:#fff}
.explain-step b{display:flex;align-items:center;gap:9px;margin-bottom:6px}.step-num{display:grid;place-items:center;width:28px;height:28px;border-radius:999px;background:#e3f0e8;color:var(--green);font-weight:900}
.explain-step p{margin:0;color:var(--muted)}
.checklist{list-style:none;padding:0;margin:18px 0;display:grid;gap:10px}
.checklist li{position:relative;padding:12px 14px 12px 44px;border:1px solid var(--line);border-radius:13px;background:#fff}
.checklist li:before{content:"";position:absolute;left:14px;top:15px;width:17px;height:17px;border:2px solid #7ca58e;border-radius:5px;background:#f8fbf9}
.legal-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0}
.legal-summary>div{padding:14px;border:1px solid var(--line);border-radius:14px;background:#f8faf8}
.legal-summary strong{display:block;margin-bottom:4px}.legal-summary span{color:var(--muted);font-size:.9rem}
.prose .updated{display:inline-flex;margin:0 0 14px;padding:6px 9px;border-radius:999px;background:#eef5f0;color:#416454;font-size:.8rem;font-weight:750}
@media(max-width:900px){.explain-grid{grid-template-columns:1fr 1fr}.legal-summary{grid-template-columns:1fr}}
@media(max-width:560px){.explain-grid{grid-template-columns:1fr}.toc a.btn{width:100%}}

.inline-unit{display:grid;grid-template-columns:minmax(0,1fr) 86px;gap:8px}.inline-unit input,.inline-unit select{width:100%}
.storm-log-list{display:grid;gap:12px;margin:16px 0 24px}.storm-log-empty{padding:18px;border:1px dashed #b9c9bd;border-radius:14px;color:var(--muted);background:#f8faf8}
.storm-log-item{position:relative;display:grid;grid-template-columns:1.1fr 1fr;gap:8px 18px;padding:16px 110px 16px 16px;border:1px solid var(--line);border-radius:16px;background:#fff}
.storm-log-item>div{display:grid;gap:3px}.storm-log-item span{color:var(--muted)}.storm-log-item p{grid-column:1/-1;margin:2px 0 0;color:#33463c}
.storm-alert{display:inline-flex;width:max-content;padding:3px 7px;border-radius:999px;background:#fff0e5;color:#8b4d1f;font-size:.75rem}
.storm-remove{position:absolute;right:14px;top:14px;border:1px solid var(--line);background:#fff;border-radius:9px;padding:7px 10px;color:var(--muted);cursor:pointer}
.storm-remove:hover{color:var(--ink);border-color:#aebbb1}
@media(max-width:620px){.inline-unit{grid-template-columns:1fr 78px}.storm-log-item{grid-template-columns:1fr;padding:16px}.storm-log-item p{grid-column:auto}.storm-remove{position:static;width:max-content;margin-top:3px}}