/* ============================================================
   MISSOURI WELL WATER  -  independent field guide
   Design system: cool / clinical reference guide
   Display  : Spectral 600
   Body     : Public Sans 400 / 500
   Labels   : IBM Plex Mono 500  (eyebrows, section numbers)
   ============================================================ */

:root{
  --base:#f4f6f5;   /* cool off-white page       */
  --ink:#14201c;    /* primary text              */
  --spruce:#0F473C; /* primary / brand           */
  --spruce-d:#0b3a30;
  --lapis:#2f6fb3;  /* links / secondary         */
  --gold:#D6A24E;   /* accent / callout          */
  --rule:#dfe4e1;   /* hairlines                 */
  --card:#ffffff;   /* card surfaces             */
  --tint:#eaf0ee;   /* cool tint (zebra, wells)  */
  --muted:#5a6a64;  /* secondary text            */
  --maxw:800px;

  --serif:"Spectral",Georgia,"Times New Roman",serif;
  --sans:"Public Sans",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote,table{margin:0}
img,svg{max-width:100%;display:block}
a{color:var(--lapis);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:2px}
a:hover{color:var(--spruce)}
::selection{background:var(--spruce);color:#fff}

/* ---------- base ---------- */
body{
  font-family:var(--sans);
  font-weight:400;
  font-size:18px;
  line-height:1.65;
  color:var(--ink);
  background:var(--base);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* thin brand rule across the very top */
.topbar{height:4px;background:linear-gradient(90deg,var(--spruce) 0 62%,var(--gold) 62% 100%)}

/* ---------- header / masthead ---------- */
.masthead{background:var(--base);border-bottom:1px solid var(--rule)}
.masthead .container{
  display:flex;align-items:center;justify-content:space-between;
  gap:18px;flex-wrap:wrap;padding-top:16px;padding-bottom:16px;
}
.wordmark{display:inline-flex;align-items:center;gap:9px;text-decoration:none;color:var(--ink)}
.wordmark svg{width:24px;height:24px;flex:none}
.wordmark .wm-text{
  font-family:var(--serif);font-weight:600;font-size:1.28rem;line-height:1;letter-spacing:.005em;
}
.wordmark .wm-text b{color:var(--spruce);font-weight:600}
.wordmark .wm-sub{
  display:block;font-family:var(--mono);font-weight:500;font-size:.58rem;
  letter-spacing:.18em;text-transform:uppercase;color:var(--muted);margin-top:4px;
}

nav.nav{display:flex;flex-wrap:wrap;gap:4px 18px;align-items:center}
nav.nav a{
  font-family:var(--sans);font-weight:500;font-size:.92rem;color:var(--ink);
  text-decoration:none;padding:3px 0;border-bottom:2px solid transparent;
}
nav.nav a:hover{color:var(--spruce);border-bottom-color:var(--rule)}
nav.nav a[aria-current="page"]{color:var(--spruce);border-bottom-color:var(--gold)}

/* ---------- page shell ---------- */
main{padding:14px 0 8px}
.eyebrow{
  font-family:var(--mono);font-weight:500;font-size:.78rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--spruce);margin:26px 0 10px;
}
h1.title{
  font-family:var(--serif);font-weight:600;line-height:1.08;letter-spacing:-.01em;
  font-size:clamp(2rem,5.2vw,2.75rem);color:var(--ink);margin:0 0 6px;max-width:20ch;
}
.byline{
  font-family:var(--mono);font-weight:500;font-size:.76rem;letter-spacing:.06em;
  color:var(--muted);margin:0 0 22px;text-transform:uppercase;
}
.byline .dot{color:var(--gold);padding:0 6px}

/* answer-first lede */
.lede{
  font-size:1.2rem;line-height:1.5;color:var(--ink);
  border-left:3px solid var(--gold);padding:2px 0 2px 18px;margin:0 0 30px;
}
.lede strong{font-weight:600}

/* body prose */
.prose p{margin:0 0 1.05em}
.prose ul,.prose ol{margin:0 0 1.15em;padding-left:1.3em}
.prose li{margin:.32em 0}
.prose strong{font-weight:600;color:var(--ink)}
.prose h3{
  font-family:var(--serif);font-weight:600;font-size:1.18rem;line-height:1.25;
  color:var(--spruce-d);margin:1.7em 0 .5em;
}

/* ---------- numbered sections ---------- */
.section{margin:34px 0}
.sec-head{
  display:flex;align-items:baseline;gap:.8rem;
  border-left:3px solid var(--spruce);padding-left:16px;margin:0 0 14px;
}
.sec-num{
  font-family:var(--mono);font-weight:500;font-size:.9rem;letter-spacing:.06em;
  color:var(--gold);flex:none;transform:translateY(-1px);
}
.sec-head h2{
  font-family:var(--serif);font-weight:600;line-height:1.16;
  font-size:clamp(1.32rem,3.4vw,1.62rem);color:var(--spruce-d);
}

/* ---------- "test it" callout ---------- */
.testit{
  background:var(--card);border:1px solid var(--rule);border-left:4px solid var(--gold);
  border-radius:8px;padding:16px 20px;margin:22px 0;
  box-shadow:0 1px 0 rgba(15,71,60,.04);
}
.testit .tag{
  font-family:var(--mono);font-weight:500;font-size:.72rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gold);display:block;margin-bottom:5px;
}
.testit p{margin:0;font-size:1rem;line-height:1.55}
.testit p+p{margin-top:.6em}

/* ---------- checklist ---------- */
.checklist{list-style:none;margin:20px 0;padding:0}
.checklist li{
  position:relative;padding:12px 4px 12px 44px;border-bottom:1px solid var(--rule);
  line-height:1.5;
}
.checklist li:first-child{border-top:1px solid var(--rule)}
.checklist li::before{
  content:"";position:absolute;left:6px;top:14px;width:22px;height:22px;
  border-radius:5px;background:var(--spruce);
}
.checklist li::after{
  content:"";position:absolute;left:12.5px;top:18px;width:9px;height:5px;
  border-left:2.5px solid #fff;border-bottom:2.5px solid #fff;
  transform:rotate(-45deg);
}
.checklist li b{font-weight:600;color:var(--spruce-d)}
.checklist li .why{color:var(--muted)}

/* ---------- facts table ---------- */
.table-wrap{overflow-x:auto;margin:22px 0;border:1px solid var(--rule);border-radius:8px}
table.facts{width:100%;border-collapse:collapse;font-size:.98rem;min-width:520px;background:var(--card)}
table.facts caption{
  caption-side:top;text-align:left;font-family:var(--mono);font-weight:500;
  font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);
  padding:12px 14px 0;
}
table.facts th,table.facts td{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--rule)}
table.facts thead th{
  background:var(--spruce);color:#fff;font-family:var(--sans);font-weight:600;
  font-size:.82rem;letter-spacing:.03em;text-transform:uppercase;
}
table.facts tbody tr:nth-child(even){background:var(--tint)}
table.facts tbody tr:last-child td{border-bottom:none}
table.facts td:first-child{font-weight:600;color:var(--spruce-d);white-space:nowrap}
table.facts .num{font-family:var(--mono);font-size:.9rem}

/* generic note line */
.note{font-size:.9rem;color:var(--muted);margin:.6em 0 0}
.source{font-size:.82rem;color:var(--muted);font-family:var(--mono);letter-spacing:.02em}

/* ---------- funnel / recommend module ---------- */
.recommend{
  background:var(--spruce);color:#e9f1ee;border-radius:12px;
  padding:30px 30px 26px;margin:38px 0;position:relative;overflow:hidden;
  border:1px solid var(--spruce-d);
}
.recommend::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--gold) 0 40%,transparent 40%);
}
.rec-eyebrow{
  font-family:var(--mono);font-weight:500;font-size:.74rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gold);margin:0 0 8px;
}
.recommend h3{
  font-family:var(--serif);font-weight:600;font-size:1.5rem;line-height:1.2;
  color:#fff;margin:0 0 12px;
}
.recommend p{margin:0 0 14px;font-size:1rem;line-height:1.58;color:#d7e3df}
.rec-btn{
  display:inline-block;background:var(--gold);color:#3a2b0e;text-decoration:none;
  font-family:var(--sans);font-weight:600;font-size:1.02rem;letter-spacing:.01em;
  padding:13px 24px;border-radius:8px;margin:2px 0 16px;
  box-shadow:0 2px 0 rgba(0,0,0,.18);
}
.rec-btn:hover{background:#e2b566;color:#3a2b0e}
.rec-disclosure{font-size:.82rem;line-height:1.5;color:#a9bdb6;margin:0;border-top:1px solid rgba(255,255,255,.12);padding-top:12px}

/* ---------- more from this guide ---------- */
.more{margin:44px 0 10px}
.more h2{
  font-family:var(--mono);font-weight:500;font-size:.8rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);margin:0 0 16px;
  padding-bottom:10px;border-bottom:1px solid var(--rule);
}
.more-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.more-card{
  display:block;background:var(--card);border:1px solid var(--rule);border-radius:9px;
  padding:16px 18px;text-decoration:none;color:var(--ink);transition:border-color .15s,transform .15s;
}
.more-card:hover{border-color:var(--spruce);transform:translateY(-2px)}
.more-card .mk{
  font-family:var(--mono);font-weight:500;font-size:.68rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--gold);display:block;margin-bottom:6px;
}
.more-card .mt{
  font-family:var(--serif);font-weight:600;font-size:1.1rem;line-height:1.22;color:var(--spruce-d);display:block;
}
.more-card .ma{color:var(--lapis);font-weight:600;font-size:.9rem;margin-top:8px;display:inline-block}
.more-card:hover .ma{color:var(--spruce)}

/* ---------- footer ---------- */
footer.site{border-top:1px solid var(--rule);background:#fff;margin-top:40px}
footer.site .container{padding-top:30px;padding-bottom:40px}
.foot-mark{display:inline-flex;align-items:center;gap:8px;margin-bottom:12px}
.foot-mark svg{width:20px;height:20px}
.foot-mark span{font-family:var(--serif);font-weight:600;font-size:1.05rem;color:var(--ink)}
.foot-mark span b{color:var(--spruce)}
footer.site p{font-size:.86rem;line-height:1.6;color:var(--muted);margin:0 0 10px;max-width:60ch}
footer.site .foot-test{
  font-family:var(--sans);font-weight:600;font-size:.9rem;color:var(--spruce);
  text-decoration:none;border-bottom:2px solid var(--gold);padding-bottom:1px;
}
footer.site .foot-test:hover{color:var(--spruce-d)}
footer.site .fine{font-size:.78rem;color:#8a9791;margin-top:16px}

/* ---------- responsive ---------- */
@media (max-width:640px){
  body{font-size:17px}
  .masthead .container{gap:12px}
  nav.nav{gap:2px 14px;width:100%}
  nav.nav a{font-size:.86rem}
  .more-grid{grid-template-columns:1fr}
  .recommend{padding:24px 22px}
  .lede{font-size:1.1rem}
}