:root{
  --bg:#f7f8f4;--surface:#fff;--ink:#1c2a1f;--muted:#5a6b5e;--line:#dfe5da;
  --brand:#2f7d32;--brand-ink:#fff;--accent:#e8f3e4;--warn:#fff4d6;--danger:#b3261e;
  --radius:12px;--shadow:0 1px 3px rgba(20,40,20,.08);
}
:root[data-theme="dark"]{
  --bg:#121a14;--surface:#1b261d;--ink:#e8efe8;--muted:#9fb1a2;--line:#2c3a2f;
  --brand:#5fbf63;--brand-ink:#0d1a0e;--accent:#22351f;--warn:#3a3218;--danger:#ff8a80;--shadow:none;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#121a14;--surface:#1b261d;--ink:#e8efe8;--muted:#9fb1a2;--line:#2c3a2f;
    --brand:#5fbf63;--brand-ink:#0d1a0e;--accent:#22351f;--warn:#3a3218;--danger:#ff8a80;--shadow:none;
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--brand)}
img,svg{max-width:100%}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
.site-header{background:var(--surface);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:56px;flex-wrap:wrap}
.logo{font-weight:800;text-decoration:none;color:var(--ink);font-size:1.1rem}
.logo span{color:var(--brand)}
nav a{margin-right:14px;text-decoration:none;color:var(--ink);font-weight:600;font-size:.95rem}
nav a:hover{color:var(--brand)}
.theme-btn{background:none;border:1px solid var(--line);color:var(--ink);border-radius:999px;padding:6px 12px;cursor:pointer;font-size:.9rem}
.crumbs{font-size:.9rem;color:var(--muted);padding:14px 0 0}
.crumbs a{color:var(--muted)}
h1{font-size:clamp(1.7rem,4.5vw,2.4rem);line-height:1.2;margin:.4em 0 .3em}
h2{font-size:1.5rem;line-height:1.3;margin:2em 0 .5em}
h3{font-size:1.15rem;margin:1.4em 0 .3em}
.lead{color:var(--muted);font-size:1.05rem;margin:0 0 1rem}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.calc{display:grid;gap:16px;grid-template-columns:1fr;margin:16px 0}
@media(min-width:900px){.calc{grid-template-columns:1.25fr 1fr;align-items:start}.results{position:sticky;top:12px}}
.card h2{margin:0 0 .6em;font-size:1.15rem}
label{display:block;font-weight:600;font-size:.9rem;margin:0 0 4px}
input,select{width:100%;font:inherit;font-size:1rem;padding:11px 12px;min-height:46px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink)}
input:focus,select:focus,button:focus-visible{outline:3px solid color-mix(in srgb,var(--brand) 45%,transparent);outline-offset:1px}
.row{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));margin-bottom:12px}
.zone{border:1px solid var(--line);border-radius:10px;padding:12px;margin-bottom:12px;background:var(--surface)}
.zone.cut{border-color:var(--danger)}
.zone-head{display:flex;gap:8px;align-items:center;margin-bottom:10px}
.zone-head strong{white-space:nowrap}
.zone-head select{flex:1}
.zone .row{margin-bottom:6px}
.chk{display:flex;align-items:center;gap:8px;font-weight:500;font-size:.9rem;margin:0}
.chk input{width:20px;min-height:20px;height:20px}
.zone-area{font-size:.85rem;color:var(--muted);margin-top:6px}
button{font:inherit;cursor:pointer}
.btn{background:var(--brand);color:var(--brand-ink);border:0;border-radius:8px;padding:11px 16px;min-height:46px;font-weight:700}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn.small{min-height:38px;padding:6px 12px;font-size:.9rem}
.x{background:none;border:1px solid var(--line);color:var(--muted);border-radius:8px;min-width:40px;min-height:40px}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.big{font-size:2.1rem;font-weight:800;line-height:1.1;color:var(--brand)}
.big small{display:block;font-size:.9rem;font-weight:600;color:var(--muted);margin-top:4px}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:14px 0}
.stat{background:var(--accent);border-radius:10px;padding:10px 12px}
.stat b{display:block;font-size:1.2rem}
.stat span{font-size:.82rem;color:var(--muted)}
.opt{border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-top:10px}
.opt.best{border-color:var(--brand);background:var(--accent)}
.note{background:var(--warn);border-radius:10px;padding:10px 12px;font-size:.9rem;margin-top:12px}
.hint{font-size:.85rem;color:var(--muted);margin:2px 0 10px}
details.more{margin:6px 0 12px}
details.more summary{cursor:pointer;font-weight:700;padding:8px 0}
.toast{position:fixed;left:50%;bottom:76px;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:8px 16px;border-radius:999px;font-size:.9rem;opacity:0;pointer-events:none;transition:opacity .2s;z-index:30}
.toast.show{opacity:1}
/* ad slots reserve their space so nothing jumps when ads load */
.ad{display:flex;align-items:center;justify-content:center;margin:22px auto;background:repeating-linear-gradient(45deg,transparent 0 10px,rgba(0,0,0,.02) 10px 20px);border:1px dashed var(--line);border-radius:8px;color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;overflow:hidden}
.ad-top{min-height:110px;max-width:970px}
.ad-mid{min-height:280px;max-width:728px}
.ad-end{min-height:280px;max-width:728px}
@media(max-width:600px){.ad-top{min-height:100px}.ad-mid,.ad-end{min-height:250px}}
article table{width:100%;border-collapse:collapse;margin:12px 0;font-size:.95rem;display:block;overflow-x:auto}
article th,article td{border:1px solid var(--line);padding:8px 10px;text-align:left;white-space:nowrap}
article th{background:var(--accent)}
.formula{background:var(--accent);border-left:4px solid var(--brand);padding:10px 14px;border-radius:6px;font-family:ui-monospace,Menlo,monospace;font-size:.92rem;overflow-x:auto}
.quick{background:var(--accent);border-radius:var(--radius);padding:14px 18px;margin:18px 0}
.faq details{border-bottom:1px solid var(--line);padding:10px 0}
.faq summary{cursor:pointer;font-weight:700}
.related{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.related a{display:block;padding:12px 14px;border:1px solid var(--line);border-radius:10px;text-decoration:none;color:var(--ink);background:var(--surface);font-weight:600}
.related a small{display:block;font-weight:400;color:var(--muted)}
.site-footer{margin-top:48px;border-top:1px solid var(--line);background:var(--surface);padding:24px 0;font-size:.9rem;color:var(--muted)}
.site-footer a{margin-right:14px;color:var(--muted)}
.cookie{position:fixed;left:0;right:0;bottom:0;background:var(--surface);border-top:1px solid var(--line);padding:12px 16px;display:none;gap:12px;align-items:center;justify-content:center;flex-wrap:wrap;font-size:.88rem;z-index:40}
.cookie.show{display:flex}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.print-only{display:none}
@media print{
  .site-header,.site-footer,.ad,.actions,.crumbs,.cookie,.toast,#inputs,article,.related,.no-print{display:none!important}
  .calc{display:block}.card{border:0;box-shadow:none}
  .print-only{display:block}
  body{background:#fff;color:#000}
}

[hidden]{display:none!important}

/* QC fixes: phone-width selects were clipping their labels in two-column rows */
@media(max-width:560px){
  .card .row{grid-template-columns:1fr}
  .zone .row{grid-template-columns:1fr 1fr}
  .zone .row>div:only-child{grid-column:1/-1}
  .zone-head select{min-width:0}
}
.logo{display:inline-block;padding:10px 0}
.site-footer a{display:inline-block;padding:8px 0}
body.has-cookie{padding-bottom:84px}
@media(max-width:560px){body.has-cookie{padding-bottom:130px}}

/* sticky phone summary bar (see Engine.mini) */
.mini{display:none}
@media(max-width:899px){
  .mini{position:fixed;left:12px;right:12px;bottom:12px;z-index:35;background:var(--brand);color:var(--brand-ink);
    border-radius:999px;padding:12px 18px;font-weight:700;text-align:center;text-decoration:none;box-shadow:0 4px 14px rgba(0,0,0,.25);font-size:.95rem}
  .mini:not([hidden]){display:block}
  body.has-cookie .mini{bottom:76px}
  body.has-mini{padding-bottom:84px}
  body.has-mini.has-cookie{padding-bottom:150px}
}
@media print{.mini{display:none!important}}
@media(max-width:899px){.toast{bottom:140px}}

/* header: logo + theme icon on top, nav as pills (scrolls sideways on phones) */
.site-header{position:sticky;top:0;z-index:20}
.site-header .wrap{display:grid;grid-template-columns:1fr auto;align-items:center;column-gap:20px;row-gap:0;min-height:0;padding-top:0;padding-bottom:8px}
.site-header .logo{grid-column:1;grid-row:1;padding:10px 0 4px}
.site-header .theme-btn{grid-column:2;grid-row:1}
.site-header nav{grid-column:1/-1;grid-row:2;display:flex;flex-wrap:wrap;gap:4px;justify-content:center;min-width:0}
.site-header nav a{margin:0;padding:8px 14px;border-radius:999px;white-space:nowrap}
.site-header nav a:hover{background:var(--accent);color:var(--brand)}
.theme-btn{width:40px;height:40px;padding:0;display:inline-flex;align-items:center;justify-content:center;font-size:1.15rem;line-height:1}
.theme-btn:hover{background:var(--accent)}
@media(max-width:760px){
  .site-header .wrap{grid-template-columns:1fr auto;min-height:0;padding-bottom:8px}
  .site-header .logo{padding:12px 0 4px}
  .site-header .theme-btn{margin-top:6px}
  .site-header nav{flex-wrap:nowrap;justify-content:flex-start;overflow-x:auto;scrollbar-width:none;margin:0 -16px;padding:0 16px;-webkit-overflow-scrolling:touch}
  .site-header nav::-webkit-scrollbar{display:none}
  .site-header nav a{padding:7px 14px;background:var(--accent);font-size:.92rem}
}
.crumbs{white-space:nowrap;overflow-x:auto;scrollbar-width:none}
.crumbs::-webkit-scrollbar{display:none}
@media print{.site-header{position:static}}

/* diagrams (inline SVG, theme aware) and table of contents */
figure.diagram{margin:20px 0;padding:14px 14px 10px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
figure.diagram svg{display:block;width:100%;height:auto;max-width:680px;margin:0 auto}
figure.diagram figcaption{margin-top:8px;font-size:.9rem;color:var(--muted);text-align:center}
.dg-t,.dg-s,.dg-big{fill:var(--ink);font:600 13px system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.dg-s{fill:var(--muted);font-weight:500;font-size:12px}
.dg-big{font-size:20px;font-weight:800}
.dg-onlayer{fill:#1c2a1f}
.dg-ln{stroke:var(--muted);stroke-width:1.5;fill:none}
.dg-ah{fill:var(--muted)}
.dg-fill{fill:var(--accent);stroke:var(--brand);stroke-width:2}
.dg-dot{fill:var(--brand)}
.dg-top{fill:#9bc79d;stroke:var(--brand);stroke-width:1.5}
.dg-side{fill:#6fa872;stroke:var(--brand);stroke-width:1.5}
.dg-ground{fill:#8a6b4a}
.dg-soil{fill:#5b3f2a}
.dg-grain{fill:#3d2a1b}
.dg-mulch{fill:#a0642f}
.dg-chip{fill:#6e3f17}
.dg-gravel{fill:#b9b4aa}
.dg-concrete{fill:#c9ccce}
.dg-stone{fill:#8e897f}
.dg-sod{fill:#58a55c;stroke:#2f7d32;stroke-width:1.5}
.dg-sod2{fill:#47924b;stroke:#2f7d32;stroke-width:1.5}
.dg-wood{fill:#b08a5a}
:root[data-theme="dark"] .dg-onlayer{fill:#fff}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .dg-onlayer{fill:#fff}}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;margin:18px 0}
.toc strong{display:block;margin-bottom:6px}
.toc ol{margin:0;padding-left:22px;columns:2;column-gap:28px}
.toc li{margin:3px 0;break-inside:avoid}
@media(max-width:620px){.toc ol{columns:1}}
article h2[id]{scroll-margin-top:84px}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.toc{display:none}}

/* quick-start chips and the "how far will it go" card */
.starters{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:2px 0 12px}
.starters span{font-size:.9rem;color:var(--muted);font-weight:600}
.chip{background:var(--accent);color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:8px 14px;min-height:40px;font-weight:600;font-size:.92rem}
.chip:hover,.chip[aria-pressed="true"]{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}
.reverse{margin:18px 0}
.reverse h2{margin-top:0}
.rv-out{margin-top:12px}
.rv-out .big{font-size:1.6rem;font-weight:800}
.rv-out .big small{display:block;font-size:.9rem;font-weight:500;color:var(--muted)}

/* garden artwork: banner scenes, leaf pattern and grass edge (SVG files in /assets, light and dark versions) */
:root{
  --art-hero:url(/assets/bg-hero-light.svg);--art-banner:url(/assets/bg-banner-light.svg);
  --art-grass:url(/assets/bg-grass-light.svg);--art-leaves:url(/assets/bg-garden-light.svg);--sky:#dcefe9;
}
:root[data-theme="dark"]{
  --art-hero:url(/assets/bg-hero-dark.svg);--art-banner:url(/assets/bg-banner-dark.svg);
  --art-grass:url(/assets/bg-grass-dark.svg);--art-leaves:url(/assets/bg-garden-dark.svg);--sky:#14261b;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --art-hero:url(/assets/bg-hero-dark.svg);--art-banner:url(/assets/bg-banner-dark.svg);
    --art-grass:url(/assets/bg-grass-dark.svg);--art-leaves:url(/assets/bg-garden-dark.svg);--sky:#14261b;
  }
}
body{background:var(--bg) var(--art-leaves) top center/560px repeat}
.banner{background:var(--sky) var(--art-banner) center bottom/cover no-repeat;border-bottom:1px solid var(--line)}
.banner .wrap{padding-top:6px;padding-bottom:96px}
.banner h1{margin-top:.25em}
.banner .lead{color:var(--ink);opacity:.82;max-width:640px}
.banner-home{background-image:var(--art-hero)}
.banner-home .wrap{padding-top:34px;padding-bottom:150px}
.banner-home h1{font-size:clamp(2rem,6vw,3.2rem)}
.banner-home .lead{font-size:1.15rem;max-width:560px}
.cta{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 0}
.cta .btn{text-decoration:none;display:inline-flex;align-items:center;box-shadow:0 2px 8px rgba(0,0,0,.18)}
main.wrap{padding-top:6px}
.site-footer{position:relative;margin-top:64px}
.site-footer::before{content:"";position:absolute;left:0;right:0;top:-47px;height:48px;background:var(--art-grass) center bottom/400px 48px repeat-x;pointer-events:none}
.card{border-top:3px solid var(--brand)}
.related a{border-left:4px solid var(--brand)}
@media(max-width:560px){.banner .wrap{padding-bottom:120px}.banner-home .wrap{padding-bottom:170px}}
@media print{.banner{background:none;border:0}.banner .wrap{padding-bottom:0}.site-footer::before{display:none}body{background:#fff}}

/* logo: leaf badge + wordmark */
.logo{display:inline-flex;align-items:center;gap:11px;padding:8px 0}
.logo-mark{width:52px;height:52px;flex:none;border-radius:12px;box-shadow:0 2px 6px rgba(30,90,40,.3)}
.logo .logo-text{display:flex;flex-direction:column;line-height:1.1;color:var(--ink)}
.logo-text b{font-size:1.9rem;font-weight:800;letter-spacing:-.02em}
.logo .logo-text b span{color:var(--brand)}
.logo-text small{font-size:.72rem;font-weight:600;color:var(--muted);letter-spacing:.02em;margin-top:2px}
@media(max-width:760px){.logo-mark{width:42px;height:42px}.logo-text b{font-size:1.55rem}.logo-text small{display:none}}

/* phones: centered logo, theme button on the right */
@media(max-width:760px){
  .site-header .wrap{grid-template-columns:40px 1fr 40px}
  .site-header .logo{grid-column:2;grid-row:1;justify-self:center}
  .site-header .theme-btn{grid-column:3;grid-row:1;margin-top:0}
  .site-header nav{justify-content:safe center}
}
@media(max-width:760px){
  .site-header .logo{padding:12px 0 8px}
  .site-header nav{margin-top:6px;padding-bottom:4px}
  .site-header .wrap{padding-bottom:12px}
}

/* spot illustrations */
.banner .wrap{position:relative}
.banner-art{position:absolute;right:16px;bottom:34px;width:190px;height:auto;pointer-events:none;filter:drop-shadow(0 4px 6px rgba(0,0,0,.18))}
.banner-home .banner-art{display:none}
@media(max-width:900px){.banner-art{width:140px;bottom:30px}}
@media(max-width:620px){.banner-art{display:none}}
.related a{position:relative;padding-right:76px;min-height:64px}
.card-ico{position:absolute;right:10px;top:50%;transform:translateY(-50%);width:52px;height:auto}
@media print{.banner-art,.card-ico{display:none}}

/* content sits on a softly see-through panel so the illustrated background shows around it */
main.wrap{background:color-mix(in srgb,var(--bg) 84%,transparent)}

.binplan{margin:18px 0}
.binplan h2{margin-top:0}
.binplan .stats{margin-top:10px}
.opt table{width:100%;margin-top:6px;font-size:.95rem}

.foot-calcs{display:flex;flex-wrap:wrap;gap:6px 16px;justify-content:center;margin:0 0 10px;font-size:.9rem}