:root{
  --bg:#E6ECEA; --ink:#10262B; --hose:#FF5A1F; --water:#1E8C93; --water-lt:#4FC3C9; --sand:#F2C230; --paper:#F6F9F8;
  --font:"Bricolage Grotesque",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme=light]){--bg:#0F2A2E;--ink:#E8F1EF;--paper:#16373C;--water:#4FC3C9}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.6;font-size:1.05rem}
a{color:inherit}
:focus-visible{outline:3px solid var(--hose);outline-offset:3px}

.hose-line{position:fixed;left:8px;top:0;width:48px;height:100vh;z-index:0;pointer-events:none}
.hose-line path{fill:none;stroke-linecap:round;vector-effect:non-scaling-stroke}
.hose-bg{stroke:color-mix(in srgb,var(--ink) 12%,transparent);stroke-width:14}
.hose-fg{stroke:var(--hose);stroke-width:14}
main,header,footer{position:relative;z-index:1}
main,.top,footer{padding-left:84px;padding-right:clamp(20px,5vw,72px)}

.top{display:flex;justify-content:space-between;align-items:center;padding-top:22px;padding-bottom:22px}
.brand{font-weight:800;font-size:1.5rem;text-decoration:none;display:flex;align-items:center;gap:10px;letter-spacing:-.02em}
.dot{width:20px;height:20px;border-radius:50%;border:6px solid var(--hose);background:var(--water-lt)}
nav{display:flex;gap:22px;align-items:center}
nav a{text-decoration:none;font-weight:600}
nav a:hover{text-decoration:underline;text-underline-offset:5px}
.pill{background:var(--ink);color:var(--bg);padding:9px 18px;border-radius:99px}
.pill:hover{text-decoration:none!important;background:var(--hose);color:#fff}

.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;min-height:82vh;padding:32px 0 72px}
h1{font-size:clamp(2.6rem,6.2vw,5.4rem);line-height:.98;letter-spacing:-.035em;font-weight:800;margin:0 0 24px;max-width:13ch}
.lead{max-width:52ch;font-size:1.2rem}
.actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}
.btn{display:inline-block;background:var(--hose);color:#fff;border:0;border-radius:10px;padding:14px 26px;font:700 1rem var(--font);text-decoration:none;cursor:pointer;transition:transform .15s}
.btn:hover{transform:translateY(-2px)}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 2px var(--ink)}

.rings{position:relative;margin:0;aspect-ratio:1;max-width:460px;width:100%;justify-self:center}
.ring{position:absolute;border-radius:50%;border:var(--w) solid var(--hose);background:var(--water-lt);left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center}
.ring span{position:absolute;font-weight:800;font-size:.85rem;background:var(--paper);color:var(--ink);padding:1px 8px;border-radius:99px;white-space:nowrap}
.r5{width:100%;height:100%;--w:34px;background:var(--water);animation:fill 1.4s ease-out both}
.r5 span{top:calc(-1 * var(--w) + 4px)}
.r4{width:66%;height:66%;--w:22px;background:color-mix(in srgb,var(--sand) 70%,var(--water-lt));border-color:var(--ink)}
.r4 span{top:-18px}
.r3{width:46%;height:46%;--w:16px;border-color:var(--sand)}
.r3 span{top:-14px}
.r2{width:30%;height:30%;--w:12px;border-color:var(--paper);background:var(--water)}
.r2 span{top:-12px}
.r1{width:14%;height:14%;--w:8px;border-color:var(--hose);background:var(--paper)}
.r1 span{top:-26px;font-size:.7rem}
.rings figcaption{position:absolute;bottom:-34px;left:0;font-size:.85rem;opacity:.75}
@keyframes fill{from{clip-path:circle(0)}to{clip-path:circle(75%)}}

.block{padding:84px 0;max-width:980px}
.block.tint{background:var(--paper);margin-left:-84px;padding-left:84px;max-width:none;padding-right:clamp(20px,5vw,72px)}
.block.tint>*{max-width:760px}
h2{font-size:clamp(2rem,4vw,3rem);letter-spacing:-.03em;line-height:1.05;margin:0 0 10px}
.sub{margin:0 0 30px;opacity:.8}

.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:26px}
.filters button{font:600 .95rem var(--font);border:2px solid var(--ink);background:transparent;color:var(--ink);border-radius:99px;padding:7px 16px;cursor:pointer}
.filters button[aria-pressed=true]{background:var(--ink);color:var(--bg)}
.list{list-style:none;margin:0;padding:0}
.list li{display:grid;grid-template-columns:minmax(120px,220px) 1fr auto;gap:24px;align-items:center;padding:18px 0;border-top:2px solid color-mix(in srgb,var(--ink) 18%,transparent)}
.tube{height:var(--d);min-height:6px;border-radius:99px;background:var(--c);box-shadow:inset 0 -4px 0 rgba(0,0,0,.18)}
.list h3{margin:0;font-size:1.2rem;letter-spacing:-.01em}
.list p{margin:2px 0 0;font-size:.95rem;opacity:.8}
.spec{font-weight:700;text-align:right;white-space:nowrap;font-size:.95rem}

.picker{display:grid;gap:12px}
.picker label{font-weight:700}
select,input,textarea{font:inherit;color:var(--ink);background:var(--bg);border:2px solid var(--ink);border-radius:10px;padding:12px 14px;width:100%}
input[type=range]{padding:0;border:0;accent-color:var(--hose);background:none}
.result{margin-top:14px;padding:22px;border-left:10px solid var(--hose);background:var(--bg);border-radius:0 12px 12px 0}
.result strong{font-size:1.35rem;display:block;letter-spacing:-.01em}

form{display:grid;grid-template-columns:1fr 1fr;gap:18px;max-width:720px}
.field{display:flex;flex-direction:column;gap:6px}
.field.wide,form .btn,.ok{grid-column:1/-1}
.field label{font-weight:700}
.err{color:#C0310A;min-height:1.1em;font-weight:600}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .err{color:#FF9D7A}}
.field.bad input,.field.bad textarea{border-color:#C0310A}
.ok{font-weight:700;color:var(--water);margin:0}
footer{display:flex;gap:10px 32px;flex-wrap:wrap;padding-top:32px;padding-bottom:40px;border-top:2px solid color-mix(in srgb,var(--ink) 18%,transparent);font-size:.95rem}

@media (max-width:820px){
  .hose-line{display:none}
  main,.top,footer{padding-left:20px}
  .block.tint{margin-left:-20px;padding-left:20px}
  .hero{grid-template-columns:1fr;min-height:0}
  .rings{max-width:320px;margin-bottom:30px}
  nav a:not(.pill){display:none}
  .list li{grid-template-columns:1fr;gap:8px}
  .spec{text-align:left}
  form{grid-template-columns:1fr}
}