:root{--green:#1f4d38;--green-2:#2e6b4a;--ink:#222;--mute:#666;--rule:#dcdcdc;--bg:#fff;--side:#f4f5f2;--link:#1d5d8f;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 var(--font)}
img{display:block;max-width:100%;height:auto}
a{color:var(--link)}
a:hover{color:#0d3d63}
h1,h2,h3{line-height:1.25;overflow-wrap:anywhere}
.shell{max-width:1120px;margin:0 auto;padding:0 20px}
.narrow{max-width:780px}
main{padding-bottom:50px}

.top{background:var(--green);color:#fff}
.top-row{display:flex;align-items:center;justify-content:space-between;height:56px;gap:20px}
.mark{color:#fff;text-decoration:none;font-weight:700;font-size:22px;letter-spacing:-.01em}
.mark:hover{color:#fff}
.menu{display:flex;gap:22px}
.menu a{color:#fff;text-decoration:none;font-size:15px}
.menu a:hover,.menu a[aria-current]{text-decoration:underline}
.burger{display:none;background:none;border:1px solid #9fb8ab;color:#fff;border-radius:3px;padding:4px 10px;font:14px var(--font)}
.trail{list-style:none;display:flex;flex-wrap:wrap;gap:4px 6px;padding:12px 0 0;margin:0;font-size:14px;color:var(--mute)}
.trail li+li::before{content:"\203A";margin-right:6px}
.trail a{color:var(--mute)}

.byline{font-size:14px;color:var(--mute);margin:6px 0 0}
.dek{font-size:18px;color:#444;margin:0}
.topic-link{margin:0 0 4px;font-size:14px}
.topic-link a{color:var(--green-2);font-weight:600;text-decoration:none}
.topic-link a:hover{text-decoration:underline}
.label{font-size:18px;margin:0 0 10px;padding-bottom:6px;border-bottom:1px solid var(--rule)}
.note{font-size:14px;color:var(--mute)}
.more{font-size:15px;margin:10px 0 0}

.home{display:grid;grid-template-columns:230px minmax(0,1fr);gap:36px;padding-top:24px}
.side{background:var(--side);border:1px solid #e3e5df;padding:14px 16px;align-self:start;font-size:15px}
.side h2{font-size:15px;margin:0 0 8px;padding-bottom:6px;border-bottom:1px solid var(--rule)}
.side h2+*{margin-top:0}
.side-list{list-style:none;margin:0 0 6px;padding:0}
.side-list li{display:flex;justify-content:space-between;gap:8px;padding:4px 0}
.side-list span{color:var(--mute)}
.side-all{margin:0 0 20px;font-weight:600}
.side-steps{margin:0;padding-left:1.2em;font-size:14px;line-height:1.5}
.side-steps li{margin-bottom:10px}
.home-title{font-size:30px;margin:0 0 6px}
.home-intro{margin:0 0 22px;color:#444}
.feature{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:22px;padding-bottom:22px;border-bottom:1px solid var(--rule)}
.feature img{width:100%;aspect-ratio:16/10;object-fit:cover}
.feature h2{font-size:24px;margin:0 0 8px}
.feature h2 a{color:var(--ink);text-decoration:none}
.feature h2 a:hover{color:var(--link);text-decoration:underline}
.feature p{margin:0 0 8px}
.sec{margin-top:30px}
.sec>h2,.two h2{font-size:21px;margin:0 0 10px;padding-bottom:6px;border-bottom:2px solid var(--green)}
.sec>p{margin:0 0 12px}
.list{width:100%;border-collapse:collapse;font-size:16px}
.list td{padding:8px 8px 8px 0;border:0;border-bottom:1px solid #ececec;vertical-align:top}
.list .d{white-space:nowrap;color:var(--mute);font-size:14px;width:130px}
.list .tp{font-size:14px;width:170px}
.list .tp a{color:var(--mute)}
.calc{display:flex;flex-wrap:wrap;gap:12px 20px;align-items:end;background:var(--side);border:1px solid #e3e5df;padding:14px 16px}
.calc label{display:flex;flex-direction:column;gap:4px;font-size:14px;color:#444}
.calc input,.calc select{font:16px var(--font);padding:6px 8px;border:1px solid #bbb;border-radius:2px;background:#fff;width:150px}
.calc-out{font-size:17px;margin:12px 0 14px}
.calc-out b{color:var(--green)}
.two{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px}
.defs{margin:0}
.defs dt{font-weight:700;margin-top:12px}
.defs dt:first-child{margin-top:0}
.defs dd{margin:2px 0 0;color:#444;font-size:16px}

.tbl{overflow-x:auto;margin:0 0 1.2em}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{border:1px solid var(--rule);padding:8px 10px;text-align:left;vertical-align:top}
th{background:var(--side);font-weight:700}
td img{width:110px;aspect-ratio:16/9;object-fit:cover}

.page-head{padding-top:24px;padding-bottom:4px}
.page-head h1{font-size:32px;margin:0 0 8px}
.jump{list-style:none;padding:0;margin:14px 0 0;display:flex;flex-wrap:wrap;gap:4px 16px;font-size:15px}
.all-sec{margin-top:30px;scroll-margin-top:10px}
.all-sec h2{font-size:21px;margin:0 0 4px;padding-bottom:6px;border-bottom:2px solid var(--green)}
.all-sec h2 a{color:var(--ink);text-decoration:none}
.rows{display:block}
.row{display:grid;grid-template-columns:160px minmax(0,1fr);gap:16px;padding:14px 0;border-bottom:1px solid #ececec}
.row>*{min-width:0}
.row-img img{width:100%;aspect-ratio:3/2;object-fit:cover}
.row h3{font-size:18px;margin:0 0 4px}
.row h3 a{color:var(--ink);text-decoration:none}
.row h3 a:hover{color:var(--link);text-decoration:underline}
.row p{margin:0;font-size:15.5px;color:#444}
.row .byline{margin-top:4px;font-size:13.5px;color:var(--mute)}

.topic-head{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:28px;padding-top:24px;align-items:start}
.topic-head h1{font-size:32px;margin:0 0 8px}
.topic-head figure{margin:0}
.topic-head img{width:100%;aspect-ratio:16/10;object-fit:cover}
.topic-head figcaption{font-size:12px;color:var(--mute);margin-top:4px}
.topic-head figcaption a{color:var(--mute)}
.topic-body{margin-top:24px}
.topic-body section{max-width:900px}
.topic-body>*{min-width:0}
.topic-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 28px;margin-top:18px}
.topic-card{display:grid;grid-template-columns:150px minmax(0,1fr);gap:14px;color:var(--ink);text-decoration:none;padding-bottom:16px;border-bottom:1px solid #ececec}
.topic-card img{width:100%;aspect-ratio:3/2;object-fit:cover}
.topic-card b{font-size:18px;color:var(--link)}
.topic-card small{display:block;font-size:15px;color:#444;margin-top:4px}
.topic-card:hover b{text-decoration:underline}

.guide-head{max-width:780px;padding-top:22px}
.guide-head h1{font-size:34px;margin:0 0 10px}
.hero-fig{margin:18px 0 0;max-width:780px}
.hero-fig img{width:100%;aspect-ratio:16/9;object-fit:cover}
.hero-fig figcaption{font-size:12px;color:var(--mute);margin-top:4px}
.hero-fig figcaption a{color:var(--mute)}
.guide-grid{display:grid;grid-template-columns:minmax(0,780px) 230px;gap:36px;margin-top:24px;align-items:start}
.guide-grid>*{min-width:0}
.guide-aside{order:2}
.toc{position:sticky;top:12px;background:var(--side);border:1px solid #e3e5df;padding:12px 14px;font-size:14px}
.toc p{font-weight:700;margin:0 0 6px}
.toc ol{margin:0;padding-left:1.2em;line-height:1.5}
.toc li{margin-bottom:5px}
.guide .prose{order:1}
.prose h2{font-size:24px;margin:34px 0 10px;scroll-margin-top:12px}
.prose h3{font-size:19px;margin:22px 0 6px}
.prose p{margin:0 0 1.1em}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1.2em}
.prose li{margin-bottom:.4em}
.chart{margin:24px 0}
.chart img{width:100%}
.chart figcaption{font-size:13px;color:var(--mute);margin-top:4px}
.tip{border-left:4px solid var(--green-2);background:var(--side);padding:10px 14px;margin:0 0 1.2em}
.tip span{font-weight:700}
.tip p{margin:2px 0 0}
.ai-note{margin-top:36px;border-top:1px solid var(--rule);padding-top:12px}
.ai-note h2{font-size:15px;margin:0 0 4px}
.ai-note p{font-size:14.5px;color:var(--mute);margin:0}
.more-reading{max-width:780px;margin-top:36px}
.more-reading h2{font-size:20px;margin:0 0 8px;padding-bottom:6px;border-bottom:2px solid var(--green)}
.more-reading ul{margin:0;padding-left:1.2em}
.more-reading li{margin-bottom:6px}
.topic-intro{margin-top:14px}
.topic-intro p{font-size:16.5px;margin:0 0 .9em}

.foot{border-top:3px solid var(--green);background:var(--side);margin-top:40px;padding:22px 0 26px;font-size:14px;color:#555}
.foot p{margin:0 0 8px;max-width:900px}
.foot-links{font-size:15px}
.foot a{color:#333}

@media (max-width:900px){
  .home,.guide-grid,.topic-head{grid-template-columns:minmax(0,1fr)}
  .side{order:2}
  .guide-aside{order:0}
  .toc{position:static}
  .two{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  body{font-size:16px}
  .shell{padding:0 16px}
  .top-row{position:relative}
  .burger{display:block}
  .menu{display:none;position:absolute;top:56px;left:0;right:0;background:var(--green);flex-direction:column;gap:0;padding:6px 16px 12px;z-index:20}
  .menu.is-open{display:flex}
  .menu a{padding:8px 0}
  .feature{grid-template-columns:minmax(0,1fr)}
  .list .tp{display:none}
  .list .d{width:auto;font-size:13px}
  .list tr{display:flex;flex-direction:column}
  .list td{border:0;padding:0}
  .list tr{border-bottom:1px solid #ececec;padding:8px 0}
  .row{grid-template-columns:100px minmax(0,1fr);gap:12px}
  .row p:not(.byline){display:none}
  .topic-cards{grid-template-columns:minmax(0,1fr)}
  .topic-card{grid-template-columns:110px minmax(0,1fr)}
  .guide-head h1,.page-head h1,.topic-head h1{font-size:26px}
  .home-title{font-size:25px}
  .calc input,.calc select{width:100%}
  .calc label{flex:1 1 100%}
  .tbl table{min-width:560px}
  .home{padding-top:18px}
}