:root{
    /* Palette: USGS 7.5-minute quadrangle sheet */
    --paper:      #E7E3D5;
    --paper-2:    #DFDACA;
    --ink:        #23261F;
    --ink-soft:   #565A4C;
    --contour:    #8A6B3F;
    --contour-2:  #B29467;
    --water:      #1F5C7A;
    --water-lite: #4E8AA8;
    --veg:        #A8BE9A;
    --grid:       #C9C2AC;

    --display: "Zilla Slab", Georgia, serif;
    --body:    "IBM Plex Sans", system-ui, -apple-system, sans-serif;
    --mono:    "IBM Plex Mono", ui-monospace, monospace;

    --shell: 1180px;
    --gut: clamp(20px, 5vw, 56px);
  }

  *{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%}
body{overflow-x:hidden}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:var(--body);
    font-size:17px;
    line-height:1.65;
    /* faint survey grid across the whole sheet */
    background-image:
      linear-gradient(to right, rgba(201,194,172,.45) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(201,194,172,.45) 1px, transparent 1px);
    background-size:56px 56px;
  }
  .shell{max-width:var(--shell);margin:0 auto;padding-inline:var(--gut)}

  a{color:var(--water);text-decoration-thickness:1px;text-underline-offset:3px}
  a:focus-visible,button:focus-visible{outline:2px solid var(--water);outline-offset:3px;border-radius:2px}

  .eyebrow{
    font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;
    text-transform:uppercase;color:var(--ink-soft);
  }

  /* ── Masthead ───────────────────────────────────── */
  header{border-bottom:1px solid var(--grid);background:rgba(231,227,213,.82);backdrop-filter:blur(6px);position:sticky;top:0;z-index:20}
  .masthead{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:16px}
  .brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink)}
  .brand svg{flex:none}
  .brand b{font-family:var(--display);font-weight:600;font-size:19px;letter-spacing:.01em}
  .brand span{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--ink-soft);text-transform:uppercase;margin-top:-2px}
  nav ul{display:flex;gap:26px;list-style:none;margin:0;padding:0}
  nav a{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft);text-decoration:none;padding-block:4px;border-bottom:1px solid transparent}
  nav a:hover{color:var(--ink);border-bottom-color:var(--contour)}
  @media(max-width:720px){nav ul{gap:16px}nav a{font-size:11px}}
  @media(max-width:520px){.brand span{display:none}}

  /* ── Hero: the ridge ────────────────────────────── */
  .hero{position:relative;padding-top:clamp(48px,8vw,92px);overflow:hidden}
  .hero-copy{position:relative;z-index:2;max-width:min(100%,46rem)}
  h1{
    font-family:var(--display);font-weight:600;
    font-size:clamp(34px,5.6vw,62px);line-height:1.04;
    letter-spacing:-.02em;margin:14px 0 0;
  }
  .lede{max-width:52ch;margin:22px 0 0;color:var(--ink-soft);font-size:clamp(16px,1.6vw,18.5px)}
  .lede strong{color:var(--ink);font-weight:500}
  .cta-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
  .btn{
    display:inline-block;font-family:var(--mono);font-size:12.5px;letter-spacing:.1em;
    text-transform:uppercase;text-decoration:none;padding:13px 22px;
    border:1px solid var(--ink);color:var(--ink);background:transparent;transition:background .18s,color .18s;
  }
  .btn:hover{background:var(--ink);color:var(--paper)}
  .btn--water{border-color:var(--water);color:var(--water)}
  .btn--water:hover{background:var(--water);color:var(--paper)}

  .ridge{display:block;width:100%;height:auto;margin-top:-2%;position:relative;z-index:1}
  .ridge path,.ridge use,.ridge line,.ridge polyline{vector-effect:non-scaling-stroke}
  .ridge .c{fill:none;stroke:var(--contour-2);stroke-width:1.15;opacity:.55}
  .ridge .c-index{stroke:var(--contour);stroke-width:1.9;opacity:.95}
  
  .summit text{font-family:var(--mono);font-size:11px;fill:var(--ink-soft);letter-spacing:.1em}

  /* draw-on animation */
  .ridge .draw{stroke-dasharray:2400;stroke-dashoffset:2400;animation:draw 2.1s cubic-bezier(.22,.61,.36,1) forwards}
  .ridge .draw:nth-of-type(2){animation-delay:.07s}
  .ridge .draw:nth-of-type(3){animation-delay:.14s}
  .ridge .draw:nth-of-type(4){animation-delay:.21s}
  .ridge .draw:nth-of-type(5){animation-delay:.28s}
  .ridge .draw:nth-of-type(6){animation-delay:.35s}
  .ridge .draw:nth-of-type(7){animation-delay:.42s}
  .ridge .draw:nth-of-type(8){animation-delay:.49s}
  .summit{opacity:0;animation:fade .8s ease 1.5s forwards}
  @keyframes draw{to{stroke-dashoffset:0}}
  @keyframes fade{to{opacity:1}}
  @media(prefers-reduced-motion:reduce){
    .ridge .draw{stroke-dashoffset:0;animation:none}
    .summit{opacity:1;animation:none}
  }

  /* ── Sections ───────────────────────────────────── */
  section{padding-block:clamp(56px,7vw,88px)}
  .rule{border:0;border-top:1px solid var(--grid);margin:0}
  .sec-head{display:flex;align-items:baseline;gap:16px;margin-bottom:34px}
  .sec-head h2{font-family:var(--display);font-weight:600;font-size:clamp(23px,2.6vw,30px);margin:0;letter-spacing:-.01em}

  /* ── Product sheets ─────────────────────────────── */
  .sheets{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));gap:26px}
  .sheet{
    border:1px solid var(--grid);background:var(--paper-2);
    display:flex;flex-direction:column;transition:border-color .2s,transform .2s;
  }
  .sheet:hover{border-color:var(--contour);transform:translateY(-3px)}
  .sheet figure{margin:0;border-bottom:1px solid var(--grid);background:var(--paper);padding:0;line-height:0}
  .sheet figure svg{width:100%;height:auto;display:block}
  .sheet-body{padding:24px 26px 28px;display:flex;flex-direction:column;flex:1}
  .sheet h3{font-family:var(--display);font-size:25px;font-weight:600;margin:8px 0 0;letter-spacing:-.01em}
  .sheet p{margin:12px 0 0;color:var(--ink-soft);font-size:15.5px;line-height:1.6}
  .specs{list-style:none;margin:20px 0 0;padding:16px 0 0;border-top:1px dashed var(--grid);font-family:var(--mono);font-size:12px;color:var(--ink-soft)}
  .specs li{display:flex;justify-content:space-between;gap:14px;padding-block:4px}
  .specs b{font-weight:500;color:var(--ink);text-align:right}
  .sheet-links{margin-top:auto;padding-top:20px;display:flex;gap:18px;flex-wrap:wrap;font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase}

  /* ── About ──────────────────────────────────────── */
  .about{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,72px);align-items:start}
  @media(max-width:800px){.about{grid-template-columns:1fr}}
  .about p{margin:0 0 16px}
  .facts{list-style:none;margin:0;padding:0;font-family:var(--mono);font-size:13px}
  .facts li{display:grid;grid-template-columns:132px 1fr;gap:14px;padding-block:11px;border-bottom:1px solid var(--grid)}
  .facts li:first-child{border-top:1px solid var(--grid)}
  .facts dt,.facts .k{color:var(--ink-soft);letter-spacing:.08em;text-transform:uppercase;font-size:11px;padding-top:2px}

  /* ── Footer ─────────────────────────────────────── */
  footer{border-top:1px solid var(--grid);background:var(--paper-2);padding-block:44px 36px;font-size:14px}
  .foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
  @media(max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}}
  @media(max-width:480px){.foot-grid{grid-template-columns:1fr}}
  .foot-grid h4{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-soft);margin:0 0 14px;font-weight:500}
  .foot-grid ul{list-style:none;margin:0;padding:0}
  .foot-grid li{padding-block:4px}
  .foot-grid a{color:var(--ink);text-decoration:none;border-bottom:1px solid transparent}
  .foot-grid a:hover{border-bottom-color:var(--contour)}
  address{font-style:normal;color:var(--ink-soft);line-height:1.75}
  .legal{margin-top:36px;padding-top:20px;border-top:1px solid var(--grid);font-family:var(--mono);font-size:11.5px;color:var(--ink-soft);display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}

  /* placeholders you must replace before publishing */
  .todo{
    background:rgba(255,214,0,.35);border-bottom:2px dashed var(--contour);
    padding:0 3px;font-family:var(--mono);font-size:.92em;color:var(--ink);
  }


  /* ── Prose pages ────────────────────────────────── */
  .page-head{padding-block:clamp(40px,6vw,64px) 0}
  .page-head h1{font-size:clamp(30px,4.4vw,46px);max-width:20ch}
  .page-head .lede{margin-top:18px}
  .prose{max-width:68ch}
  .prose h2{font-family:var(--display);font-weight:600;font-size:clamp(21px,2.3vw,27px);
    margin:40px 0 12px;letter-spacing:-.01em}
  .prose h3{font-family:var(--display);font-weight:600;font-size:19px;margin:28px 0 8px}
  .prose p{margin:0 0 16px}
  .prose ul,.prose ol{margin:0 0 18px;padding-left:22px}
  .prose li{margin-bottom:7px}
  .prose table{width:100%;border-collapse:collapse;margin:0 0 22px;font-size:15px}
  .prose th,.prose td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--grid);vertical-align:top}
  .prose th{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
    color:var(--ink-soft);font-weight:500;border-bottom:1px solid var(--contour-2)}
  .updated{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;
    color:var(--ink-soft);padding-bottom:6px}
  .callout{border-left:3px solid var(--water);background:var(--paper-2);
    padding:16px 20px;margin:0 0 22px}
  .callout p:last-child{margin-bottom:0}
  .crumb{font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;
    color:var(--ink-soft);padding-top:26px}
  .crumb a{color:var(--ink-soft);text-decoration:none;border-bottom:1px solid transparent}
  .crumb a:hover{border-bottom-color:var(--contour)}
  .cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:20px;margin-top:8px}
  .card{border:1px solid var(--grid);background:var(--paper-2);padding:22px 24px;
    transition:border-color .2s,transform .2s}
  .card:hover{border-color:var(--contour);transform:translateY(-2px)}
  .card h3{font-family:var(--display);font-size:21px;font-weight:600;margin:6px 0 0}
  .card p{margin:10px 0 0;color:var(--ink-soft);font-size:15px}
  .card .go{display:inline-block;margin-top:14px;font-family:var(--mono);font-size:11.5px;
    letter-spacing:.09em;text-transform:uppercase}

  /* ── App marks ──────────────────────────────────── */
  .sheet figure{position:relative}
  .sheet figure .mark{
    position:absolute;inset:0;margin:auto;display:block;
    max-height:64%;max-width:44%;object-fit:contain;
    filter:drop-shadow(0 2px 6px rgba(35,38,31,.10));
  }
  .app-mark{
    display:flex;align-items:center;gap:18px;margin-top:20px;
  }
  .app-mark img{height:76px;width:auto;display:block}
  @media(max-width:520px){.app-mark img{height:58px}}

.coords{display:flex;flex-wrap:wrap;gap:6px 18px}
.coords span{white-space:nowrap}
.coords span+span::before{content:"·";margin-right:18px;opacity:.55}
.prose table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
@media(min-width:640px){.prose table{display:table}}
.prose td,.prose th{min-width:7.5rem}
@media(min-width:640px){.prose td,.prose th{min-width:0}}@media(max-width:560px){.sec-head{flex-direction:column;gap:6px;align-items:flex-start;margin-bottom:26px}}