/* ============================================================
   Sod Calculator — Global Stylesheet
   Mobile-First · viewport units · responsive · fast
   ============================================================ */

:root{
  --green-900:#14361f;
  --green-700:#1f6b3a;
  --green-600:#2e8b4f;
  --green-500:#3aa564;
  --green-100:#e8f5ec;
  --green-050:#f4faf6;
  --soil-700:#6b4a2b;
  --soil-500:#8a6540;
  --amber-500:#f2a900;
  --ink-900:#16231b;
  --ink-700:#33413a;
  --ink-500:#5c6b63;
  --line:#dbe6df;
  --bg:#ffffff;
  --bg-soft:#f7faf8;
  --danger:#c0392b;
  --radius:14px;
  --radius-sm:9px;
  --shadow:0 4px 18px rgba(20,54,31,.08);
  --shadow-lg:0 10px 34px rgba(20,54,31,.14);
  --maxw:1120px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:72px}
body{
  font-family:var(--font);
  color:var(--ink-900);
  background:var(--bg);
  line-height:1.62;
  font-size:clamp(15px,1.1vw + 12px,17px);
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--green-700);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4,h5,h6{line-height:1.25;color:var(--ink-900);font-weight:750}
h1{font-size:clamp(1.7rem,4.4vw,2.5rem)}
h2{font-size:clamp(1.35rem,3vw,1.9rem);margin-top:2.2rem;margin-bottom:.7rem}
h3{font-size:clamp(1.12rem,2vw,1.35rem);margin-top:1.5rem;margin-bottom:.5rem}
h4{font-size:1.05rem;margin-top:1.1rem;margin-bottom:.4rem}
h5{font-size:.98rem;margin-top:.9rem}
h6{font-size:.9rem;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-500)}
p{margin:.6rem 0}
ul,ol{margin:.6rem 0 .6rem 1.25rem}
li{margin:.3rem 0}
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(16px,4vw,28px)}
.small{font-size:.86rem;color:var(--ink-500)}
.center{text-align:center}
.hide{display:none !important}

/* ---------- Skip link (a11y) ---------- */
.skip{position:absolute;left:-999px;top:0;background:var(--green-700);color:#fff;padding:.6rem 1rem;z-index:100}
.skip:focus{left:8px;top:8px}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
}
/* interactive blocks get scroll-margin so they never rest hidden under the sticky bar */
.calc,.zone,.field,.btn-row,.tabs,.result,details{scroll-margin-top:76px}
.nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;height:60px}
.brand{display:flex;align-items:center;gap:.5rem;font-weight:800;font-size:1.12rem;color:var(--green-900)}
.brand .logo{width:30px;height:30px;flex:0 0 auto}
.nav-links{display:flex;gap:1.15rem;align-items:center;list-style:none;margin:0}
.nav-links a{color:var(--ink-700);font-weight:600;font-size:.94rem;padding:.35rem 0}
.nav-links a:hover{color:var(--green-700);text-decoration:none}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:.4rem .55rem;font-size:1.1rem;cursor:pointer;line-height:1}
/* pure-CSS mobile menu via checkbox */
#nav-check{display:none}
@media(max-width:860px){
  .nav-toggle{display:inline-flex}
  .nav-links{
    position:absolute;top:60px;left:0;right:0;
    flex-direction:column;gap:0;background:#fff;
    border-bottom:1px solid var(--line);
    max-height:0;overflow:hidden;transition:max-height .28s ease;
    box-shadow:var(--shadow);
  }
  #nav-check:checked ~ .nav-links{max-height:70vh}
  .nav-links li{width:100%;border-top:1px solid var(--line)}
  .nav-links a{display:block;padding:.9rem 4vw}
}

/* ---------- Hero / first screen ---------- */
.hero{background:linear-gradient(170deg,var(--green-050),#fff 65%);padding:clamp(20px,4vw,40px) 0 clamp(12px,2vw,20px)}
.hero h1{margin-bottom:.5rem}
.hero .lede{font-size:clamp(1rem,1.6vw,1.15rem);color:var(--ink-700);max-width:56ch}
.badges{display:flex;flex-wrap:wrap;gap:.5rem;margin:.9rem 0 .2rem}
.badge{background:var(--green-100);color:var(--green-900);border-radius:999px;padding:.28rem .7rem;font-size:.8rem;font-weight:650}

/* ---------- Calculator card ---------- */
.calc{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-lg);padding:clamp(16px,3vw,26px);margin:1rem 0 1.4rem;
}
.calc h2{margin-top:0}
.grid{display:grid;gap:1rem}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
@media(max-width:620px){.grid-2,.grid-3{grid-template-columns:1fr}}
.field{display:flex;flex-direction:column;gap:.32rem}
.field label{font-weight:650;font-size:.92rem;color:var(--ink-700)}
.field .hint{font-size:.78rem;color:var(--ink-500)}
input[type=number],input[type=text],select{
  width:100%;padding:.7rem .8rem;font-size:1rem;font-family:inherit;
  border:1.5px solid var(--line);border-radius:var(--radius-sm);background:#fff;color:var(--ink-900);
  transition:border-color .15s,box-shadow .15s;
}
input:focus,select:focus{outline:none;border-color:var(--green-500);box-shadow:0 0 0 3px rgba(58,165,100,.18)}
input[type=range]{width:100%;accent-color:var(--green-600)}
.toggle-row{display:inline-flex;background:var(--bg-soft);border:1.5px solid var(--line);border-radius:999px;padding:3px;gap:3px}
.toggle-row button{border:none;background:none;padding:.42rem .9rem;border-radius:999px;font-weight:650;font-size:.88rem;cursor:pointer;color:var(--ink-500)}
.toggle-row button.active{background:var(--green-600);color:#fff}
.tabs{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.4rem}
.tabs button{border:1.5px solid var(--line);background:#fff;padding:.5rem .85rem;border-radius:999px;font-weight:650;font-size:.87rem;cursor:pointer;color:var(--ink-700)}
.tabs button.active{background:var(--green-700);border-color:var(--green-700);color:#fff}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  background:var(--green-600);color:#fff;border:none;border-radius:var(--radius-sm);
  padding:.8rem 1.3rem;font-size:1rem;font-weight:700;cursor:pointer;font-family:inherit;
  transition:transform .05s,background .15s;width:100%;
}
.btn:hover{background:var(--green-700);text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn.secondary{background:#fff;color:var(--green-700);border:1.6px solid var(--green-600)}
.btn.secondary:hover{background:var(--green-050)}
.btn-row{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:.4rem}
.btn-row .btn{width:auto;flex:1 1 auto}
.zone-repeater .zone{border:1px dashed var(--line);border-radius:var(--radius-sm);padding:.8rem;padding-right:3rem;margin-bottom:.7rem;position:relative;background:var(--bg-soft)}
.zone .rm{position:absolute;top:.3rem;right:.3rem;width:2.2rem;height:2.2rem;display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid var(--line);border-radius:8px;color:var(--danger);font-size:1.05rem;cursor:pointer;line-height:1;z-index:2}
.zone .rm:hover{background:var(--danger);color:#fff;border-color:var(--danger)}

/* ---------- Result area ---------- */
.result{margin-top:1.1rem;border-top:2px solid var(--green-100);padding-top:1rem}
.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.8rem}
.stat{background:var(--green-050);border:1px solid var(--green-100);border-radius:var(--radius-sm);padding:.85rem}
.stat .k{font-size:.78rem;color:var(--ink-500);font-weight:600}
.stat .v{font-size:clamp(1.3rem,3.5vw,1.7rem);font-weight:800;color:var(--green-900);line-height:1.1;margin-top:.15rem}
.stat .u{font-size:.8rem;color:var(--ink-500)}
.stat.primary{background:var(--green-600);border-color:var(--green-600)}
.stat.primary .k,.stat.primary .u{color:#d8f0e0}
.stat.primary .v{color:#fff}
.breakdown{width:100%;border-collapse:collapse;margin-top:.8rem;font-size:.92rem}
.breakdown th,.breakdown td{text-align:left;padding:.55rem .5rem;border-bottom:1px solid var(--line)}
.breakdown th{color:var(--ink-500);font-weight:600;font-size:.82rem;text-transform:uppercase;letter-spacing:.03em}
.breakdown td.num{text-align:right;font-variant-numeric:tabular-nums;font-weight:650}
.range-bar{height:12px;border-radius:999px;background:linear-gradient(90deg,var(--green-500),var(--amber-500));margin:.5rem 0}
.callout{background:#fff8e6;border:1px solid #f5e2a8;border-left:4px solid var(--amber-500);border-radius:var(--radius-sm);padding:.8rem 1rem;margin:1rem 0;font-size:.93rem}
.callout.info{background:var(--green-050);border-color:var(--green-100);border-left-color:var(--green-600)}
.note{font-size:.82rem;color:var(--ink-500);margin-top:.6rem}
.err{color:var(--danger);font-size:.85rem;margin-top:.4rem;font-weight:600}

/* ---------- Derived answers (dwell-time booster) ---------- */
.derived{margin-top:1rem;border:1px solid var(--green-100);border-radius:var(--radius-sm);background:linear-gradient(180deg,var(--green-050),#fff);overflow:hidden}
.derived>summary{cursor:pointer;padding:.8rem 1rem;font-weight:700;color:var(--green-900);list-style:none;display:flex;align-items:center;gap:.5rem}
.derived>summary::-webkit-details-marker{display:none}
.derived>summary::before{content:"✦";color:var(--green-600)}
.derived>summary::after{content:"▾";margin-left:auto;transition:transform .2s}
.derived[open]>summary::after{transform:rotate(180deg)}
.derived-body{padding:0 1rem 1rem}
.derived-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:.6rem;margin-bottom:.9rem}
.dstat{background:#fff;border:1px solid var(--green-100);border-radius:var(--radius-sm);padding:.6rem .7rem;text-align:center}
.dstat .dv{font-size:clamp(1.1rem,3vw,1.35rem);font-weight:800;color:var(--green-900);line-height:1.1}
.dstat .dk{font-size:.76rem;color:var(--ink-700);font-weight:650;margin-top:.15rem}
.dstat .du{font-size:.72rem;color:var(--ink-500);margin-top:.1rem}
.derived-list{margin:.3rem 0 0;padding-left:1.1rem;font-size:.9rem}
.derived-list li{margin:.5rem 0;line-height:1.5}

/* ---------- Content sections ---------- */
main section{padding:.4rem 0}
.section-soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:1.5rem;padding:1.4rem 0}
.prose p,.prose li{color:var(--ink-700)}
.prose{max-width:74ch}
.tool-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:.9rem;margin:1rem 0}
.tool-card{display:block;border:1px solid var(--line);border-radius:var(--radius);padding:1rem;background:#fff;box-shadow:var(--shadow);transition:transform .12s,box-shadow .12s}
.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);text-decoration:none}
.tool-card .t{font-weight:750;color:var(--green-900);margin-bottom:.2rem}
.tool-card .d{font-size:.86rem;color:var(--ink-500)}
.data-table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.93rem;overflow-x:auto;display:block}
.data-table table{width:100%}
.data-table th,.data-table td{border:1px solid var(--line);padding:.6rem .7rem;text-align:left}
.data-table th{background:var(--green-050);font-weight:700}
.data-table tr:nth-child(even) td{background:var(--bg-soft)}

/* ---------- FAQ ---------- */
.faq details{border:1px solid var(--line);border-radius:var(--radius-sm);margin:.6rem 0;background:#fff;overflow:hidden}
.faq summary{cursor:pointer;padding:.9rem 1rem;font-weight:700;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:1rem;color:var(--green-600);font-size:1.2rem}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 1rem 1rem;color:var(--ink-700)}

/* ---------- Reviews ---------- */
.reviews{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:.9rem;margin:1rem 0}
.review{border:1px solid var(--line);border-radius:var(--radius);padding:1rem;background:#fff}
.review .stars{color:var(--amber-500);font-size:.95rem}
.review .who{font-weight:700;font-size:.9rem;margin-top:.5rem}

/* ---------- Breadcrumb ---------- */
.crumb{font-size:.84rem;color:var(--ink-500);padding:.7rem 0}
.crumb a{color:var(--ink-500)}
.crumb span{color:var(--ink-900);font-weight:600}

/* ---------- AdSense slots ---------- */
.ad-slot{margin:1.2rem auto;min-height:90px;display:flex;align-items:center;justify-content:center;
  background:repeating-linear-gradient(45deg,#fafafa,#fafafa 10px,#f4f4f4 10px,#f4f4f4 20px);
  border:1px dashed #e0e0e0;border-radius:10px;color:#bbb;font-size:.78rem;text-align:center}
.ad-slot::before{content:"Advertisement"}

/* ---------- Local history ---------- */
.history{margin-top:1rem}
.history table{width:100%;border-collapse:collapse;font-size:.85rem}
.history th,.history td{padding:.45rem .5rem;border-bottom:1px solid var(--line);text-align:left}
.history .clear{color:var(--danger);cursor:pointer;background:none;border:none;font-size:.82rem;font-weight:600}

/* ---------- Footer ---------- */
.site-footer{background:var(--green-900);color:#cfe3d6;margin-top:2.5rem;padding:2rem 0 1.2rem;font-size:.9rem}
.site-footer .foot-h{color:#fff;font-size:.95rem;font-weight:750;margin-bottom:.6rem}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:1.4rem}
@media(max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}}
@media(max-width:440px){.foot-grid{grid-template-columns:1fr}}
.site-footer a{color:#cfe3d6}
.site-footer a:hover{color:#fff}
.site-footer ul{list-style:none;margin:0}
.site-footer li{margin:.35rem 0}
.foot-bottom{border-top:1px solid rgba(255,255,255,.15);margin-top:1.4rem;padding-top:1rem;display:flex;flex-wrap:wrap;gap:.6rem;justify-content:space-between;align-items:center;color:#a9c7b4;font-size:.82rem}

/* ---------- Cookie bar ---------- */
.cookie{position:fixed;left:0;right:0;bottom:0;z-index:60;background:var(--ink-900);color:#eee;padding:.8rem 4vw;display:flex;gap:1rem;flex-wrap:wrap;align-items:center;justify-content:center;font-size:.85rem}
.cookie a{color:#8fd6a6}
.cookie button{background:var(--green-600);color:#fff;border:none;border-radius:8px;padding:.45rem 1rem;font-weight:700;cursor:pointer}

/* ---------- Map ---------- */
#map{height:60vh;min-height:340px;border-radius:var(--radius);border:1px solid var(--line);z-index:1}
.map-tools{display:flex;flex-wrap:wrap;gap:.5rem;margin:.7rem 0}

/* ---------- 404 ---------- */
.err-page{text-align:center;padding:clamp(40px,10vh,90px) 0}
.err-page .big{font-size:clamp(4rem,18vw,8rem);font-weight:800;color:var(--green-600);line-height:1}

/* ---------- Tag chips ---------- */
.tags{display:flex;flex-wrap:wrap;gap:.5rem;margin:1rem 0}
.tag{background:var(--green-050);border:1px solid var(--green-100);color:var(--green-900);border-radius:999px;padding:.3rem .8rem;font-size:.84rem;font-weight:600}
.tag:hover{background:var(--green-100);text-decoration:none}

/* print */
@media print{
  .site-header,.site-footer,.ad-slot,.cookie,.btn-row,.nav-toggle{display:none !important}
  .calc{box-shadow:none;border:1px solid #ccc}
}

/* ---------- Content figures & comparison tables (guide illustrations) ---------- */
.figure{margin:1.2rem 0;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--green-050);padding:.9rem 1rem;overflow:hidden}
.figure svg{width:100%;height:auto;display:block}
.figcap{font-size:.82rem;color:var(--ink-500);margin-top:.55rem;text-align:center}
.ctable{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.92rem;overflow-x:auto;display:block}
.ctable thead,.ctable tbody,.ctable tr{width:100%}
@media(min-width:560px){.ctable{display:table}}
.ctable th,.ctable td{border:1px solid var(--line);padding:.5rem .7rem;text-align:left;vertical-align:top}
.ctable th{background:var(--green-050);color:var(--green-900);font-weight:700}
.ctable caption{caption-side:bottom;font-size:.8rem;color:var(--ink-500);margin-top:.5rem;text-align:left}

/* Footer partner / link-exchange slot */
.foot-partners{margin-top:1.2rem;padding-top:1rem;border-top:1px solid rgba(255,255,255,.13)}
.foot-partners .partner-links{list-style:none;margin:.15rem 0 .5rem;padding:0;display:flex;flex-wrap:wrap;gap:.3rem 1.1rem}
.foot-partners .partner-links li{margin:0}
.foot-partners .partner-note{display:block;font-size:.85rem;color:#a9c6b4}