:root {
  --tile: #eef4fb;
  --paper: #ffffff;
  --ink: #14213d;
  --ink-soft: #4a5673;
  --heat: #e63b2e;
  --heat-soft: #ffd9d4;
  --water: #1f7ae0;
  --water-soft: #d6e8ff;
  --sewer: #7d8799;
  --sewer-out: #f28c28;
  --sewer-soft: #e4e7ee;
  --brass: #f2b705;
  --brass-deep: #c89200;

  --display: "Russo One", "Golos Text", system-ui, sans-serif;
  --body: "Golos Text", system-ui, -apple-system, "Segoe UI", sans-serif;

  --s1: .5rem; --s2: 1rem; --s3: 1.5rem; --s4: 2.5rem; --s5: 4rem; --s6: 6.5rem;
  --wrap: 72rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 400 1.0625rem/1.55 var(--body);
  color: var(--ink);
  background-color: var(--tile);
  /* ceramic tile grid */
  background-image:
    linear-gradient(rgba(20,33,61,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,33,61,.045) 1px, transparent 1px);
  background-size: 48px 48px;
}
h1, h2, h3 { font-family: var(--display); line-height: 1.08; margin: 0; letter-spacing: -.01em; }
h1 { font-size: clamp(2.3rem, 5.2vw, 4.25rem); font-weight: 400; }
h2 { font-size: clamp(1.75rem, 3.4vw, 2.625rem); font-weight: 400; max-width: 22ch; }
h3 { font-size: 1.3rem; font-weight: 400; }
p { margin: 0; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--water); outline-offset: 3px; border-radius: 4px; }

.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: var(--s1) var(--s2); z-index: 10; }
.skip:focus { left: var(--s2); }

/* header */
.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: var(--s3);
  padding: .75rem max(var(--s3), calc((100vw - var(--wrap)) / 2));
  background: rgba(238,244,251,.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(20,33,61,.08);
}
.logo { display: flex; align-items: center; gap: .6rem; text-decoration: none; font: 400 1.25rem var(--display); }
.logo svg { width: 36px; height: 36px; fill: none; stroke-width: 5; stroke-linecap: round; }
.lg-red { stroke: var(--heat); } .lg-blue { stroke: var(--water); } .lg-brass { fill: var(--brass); stroke: none; }
.nav { display: flex; gap: var(--s3); margin-left: auto; }
.nav a { text-decoration: none; font-weight: 500; color: var(--ink-soft); }
.nav a:hover { color: var(--ink); }
.phone { font: 400 1.05rem var(--display); text-decoration: none; white-space: nowrap; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 3.25rem; padding: 0 1.5rem;
  font: 600 1rem var(--body); text-decoration: none;
  border-radius: 999px; border: 2px solid transparent; cursor: pointer;
  transition: transform .15s ease, background-color .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-brass { background: var(--brass); color: var(--ink); box-shadow: inset 0 -3px 0 var(--brass-deep); }
.btn-brass:hover { background: #ffc61a; }
.btn-line { border-color: var(--ink); color: var(--ink); }
.btn-line:hover { background: var(--ink); color: #fff; }

/* sections */
main > section { padding: var(--s6) max(var(--s3), calc((100vw - var(--wrap)) / 2)); }
.section-lead { margin-top: var(--s2); max-width: 60ch; color: var(--ink-soft); }

/* hero */
.hero {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: var(--s4); align-items: center;
  padding-top: var(--s5) !important;
}
.hero h1 { max-width: 14ch; }
.lead { margin-top: var(--s3); font-size: 1.1875rem; max-width: 46ch; color: var(--ink-soft); }
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--s2); margin-top: var(--s4); }
.facts { list-style: none; padding: 0; margin: var(--s4) 0 0; display: flex; flex-wrap: wrap; gap: var(--s2) var(--s3); color: var(--ink-soft); font-size: .95rem; }
.facts b { display: block; font: 400 1.5rem var(--display); color: var(--ink); }

.scheme { margin: 0; background: var(--paper); border-radius: 28px; padding: var(--s3); box-shadow: 0 30px 60px -30px rgba(31,122,224,.35); }
.scheme-toggle { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: var(--s2); }
.scheme-toggle button {
  display: inline-flex; align-items: center; gap: .45rem;
  font: 500 .95rem var(--body); color: var(--ink);
  background: var(--tile); border: 0; border-radius: 999px; padding: .5rem .9rem; cursor: pointer;
}
.scheme-toggle button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.dot { width: .7rem; height: .7rem; border-radius: 50%; display: inline-block; }
.dot.red { background: var(--heat); } .dot.blue { background: var(--water); } .dot.grey { background: var(--sewer); }
.scheme figcaption { margin-top: var(--s1); font-size: .95rem; color: var(--ink-soft); min-height: 3em; }

#house { width: 100%; height: auto; display: block; overflow: visible; }
#house .soil { fill: #f4e7d4; }
#house .ground { stroke: #b88a5a; stroke-width: 3; }
#house .roof { fill: none; stroke: var(--ink); stroke-width: 6; stroke-linejoin: round; stroke-linecap: round; }
#house .wall { fill: #fbfdff; stroke: var(--ink); stroke-width: 4; }
#house .slab { stroke: var(--ink); stroke-width: 4; }
#house .window { fill: var(--water-soft); stroke: var(--ink); stroke-width: 2; }

#house .pipe { fill: none; stroke-width: 7; stroke-linecap: round; stroke-linejoin: round; }
#house .flow { fill: none; stroke: #fff; stroke-width: 2.5; stroke-linecap: round; stroke-dasharray: 3 14; opacity: .9; animation: flow 1.1s linear infinite; }
#house .flow.slow { animation-duration: 2.2s; }
#house .flow.down { stroke-dasharray: 5 16; animation-duration: 1.6s; }
@keyframes flow { to { stroke-dashoffset: -34; } }

#house .heat .pipe { stroke: var(--heat); }
#house .heat .pipe.ret { stroke: #f3877e; }
#house .heat .pipe.ufh { stroke-width: 4; }
#house .water .pipe { stroke: var(--water); }
#house .sewer .pipe { stroke: var(--sewer); stroke-width: 9; }
#house .sewer .pipe.out { stroke: var(--sewer-out); }

#house .boiler { fill: #fff; stroke: var(--ink); stroke-width: 3; }
#house .boiler-panel { fill: var(--ink); }
#house .flame { fill: var(--brass); animation: flame 1.4s ease-in-out infinite alternate; transform-origin: 140px 376px; }
@keyframes flame { to { transform: scale(.75); fill: var(--heat); } }
#house .radiator rect { fill: var(--heat-soft); stroke: var(--heat); stroke-width: 3; }
#house .radiator path { stroke: var(--heat); stroke-width: 2; }
#house .fixture { fill: #fff; stroke: var(--ink); stroke-width: 2.5; stroke-linejoin: round; }
#house .drops { stroke: var(--water); stroke-width: 2.5; stroke-linecap: round; stroke-dasharray: 3 6; animation: flow .6s linear infinite; }
#house .meter { fill: #fff; stroke: var(--water); stroke-width: 3; }
#house .septic { fill: #fff; stroke: var(--sewer-out); stroke-width: 4; }
#house .septic-line { stroke: var(--sewer); stroke-width: 2; }

#house .sys { transition: opacity .35s ease, filter .35s ease; }
#house[data-show="heat"] .sys:not(.heat),
#house[data-show="water"] .sys:not(.water),
#house[data-show="sewer"] .sys:not(.sewer) { opacity: .12; filter: grayscale(1); }

/* page-load: pipes draw in, then flow starts */
.js #house .pipe { stroke-dasharray: 900; stroke-dashoffset: 900; animation: draw 1.4s cubic-bezier(.6,0,.2,1) forwards; }
.js #house .water .pipe { animation-delay: .35s; }
.js #house .sewer .pipe { animation-delay: .7s; }
.js #house .flow { opacity: 0; animation: flow 1.1s linear infinite, appear .4s 1.9s forwards; }
.js #house .flow.slow { animation: flow 2.2s linear infinite, appear .4s 1.9s forwards; }
.js #house .flow.down { animation: flow 1.6s linear infinite, appear .4s 2.1s forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes appear { to { opacity: .9; } }

/* services */
.svc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s3); margin-top: var(--s4); }
.svc { background: var(--paper); border-radius: 22px; padding: 0 var(--s3) var(--s3); overflow: hidden; }
.svc > p { margin: var(--s1) 0 var(--s3); color: var(--ink-soft); }
.svc h3 { margin-top: var(--s3); }
.svc-pipe { height: 18px; margin: 0 calc(-1 * var(--s3)); position: relative; overflow: hidden; }
.svc-pipe span {
  position: absolute; inset: 0;
  background: repeating-linear-gradient(90deg, rgba(255,255,255,.55) 0 6px, transparent 6px 26px);
  animation: slide 1.4s linear infinite;
}
.svc-heat .svc-pipe { background: var(--heat); }
.svc-water .svc-pipe { background: var(--water); }
.svc-sewer .svc-pipe { background: linear-gradient(90deg, var(--sewer) 55%, var(--sewer-out) 55%); }
@keyframes slide { to { background-position: 26px 0; } }

.price { margin: 0; }
.price div { display: flex; justify-content: space-between; gap: var(--s2); padding: .6rem 0; border-top: 1px dashed rgba(20,33,61,.18); }
.price dt { color: var(--ink); }
.price dd { margin: 0; font: 400 1rem var(--display); white-space: nowrap; }
.svc-heat dd { color: var(--heat); }
.svc-water dd { color: var(--water); }
.svc-sewer dd { color: #5a6477; }

/* season */
.season { display: grid; grid-template-columns: 1fr 1.3fr; gap: var(--s4); align-items: center; background: var(--ink); color: #fff; }
.season p { color: #c6cee0; margin-top: var(--s2); max-width: 44ch; }
.plans { display: grid; grid-template-columns: 1fr 1.25fr; gap: var(--s3); align-items: stretch; }
.plan { border: 2px solid rgba(255,255,255,.2); border-radius: 22px; padding: var(--s3); display: flex; flex-direction: column; }
.plan-main { background: var(--heat); border-color: var(--heat); }
.plan-price { font: 400 2rem var(--display); margin-top: var(--s1) !important; color: #fff !important; }
.plan ul { padding-left: 1.1rem; margin: var(--s2) 0 var(--s3); color: #eef1f8; }
.plan li + li { margin-top: .3rem; }
.plan .btn { margin-top: auto; align-self: flex-start; }

/* calc */
.calc-form { margin-top: var(--s4); display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--s3); align-items: start; }
.calc-type { grid-column: 1 / -1; border: 0; padding: 0; margin: 0; display: flex; gap: var(--s1); }
.calc-type legend { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.calc-type label { position: relative; cursor: pointer; }
.calc-type input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.calc-type label { padding: .65rem 1.2rem; border-radius: 999px; background: var(--paper); font-weight: 600; }
.calc-type label:has(input:checked) { background: var(--ink); color: #fff; }
.calc-type label:has(input:focus-visible) { outline: 3px solid var(--water); outline-offset: 3px; }
.calc-rows { background: var(--paper); border-radius: 22px; padding: var(--s1) var(--s3); }
.row { display: flex; align-items: center; justify-content: space-between; gap: var(--s2); padding: .75rem 0 .75rem .9rem; border-left: 5px solid; margin: .35rem 0; }
.r-heat { border-color: var(--heat); } .r-water { border-color: var(--water); } .r-sewer { border-color: var(--sewer); }
.row input, .row select, .lead-form input, .lead-form select, .lead-form textarea {
  font: 500 1rem var(--body); color: var(--ink);
  background: var(--tile); border: 2px solid transparent; border-radius: 12px; padding: .55rem .75rem;
}
.row input { width: 6rem; text-align: right; }
.row select { max-width: 60%; }
.row input:focus, .row select:focus, .lead-form :is(input, select, textarea):focus { border-color: var(--water); outline: none; }
.calc-form[data-obj="flat"] .house-only { display: none; }
.calc-out { background: var(--brass); border-radius: 22px; padding: var(--s3); display: flex; flex-direction: column; gap: var(--s1); position: sticky; top: 6rem; }
.calc-out b { font: 400 clamp(2.2rem, 4vw, 3.2rem) var(--display); line-height: 1; }
.calc-out b.bump { animation: bump .3s ease; }
@keyframes bump { 50% { transform: scale(1.05); } }
.calc-note { font-size: .92rem; }

/* signs */
.signs-layout { display: grid; grid-template-columns: 1fr 20rem; gap: var(--s4); margin-top: var(--s4); align-items: start; }
.signs-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s2); }
.sign { background: var(--paper); border-radius: 18px; padding: var(--s3); border-top: 6px solid; display: flex; flex-direction: column; gap: .6rem; }
.s-heat { border-color: var(--heat); } .s-water { border-color: var(--water); } .s-sewer { border-color: var(--sewer); }
.sign h3 { font-size: 1.1rem; line-height: 1.2; }
.sign p { color: var(--ink-soft); font-size: .98rem; }
.sign-fix { margin-top: auto; font-weight: 600; font-size: .95rem; }
.s-heat .sign-fix { color: var(--heat); } .s-water .sign-fix { color: var(--water); } .s-sewer .sign-fix { color: #5a6477; }
.emergency { background: var(--brass); border-radius: 22px; padding: var(--s3); position: sticky; top: 6rem; }
.emergency ol { margin: var(--s2) 0 var(--s3); padding-left: 1.2rem; display: grid; gap: .6rem; }
.btn-ink { background: var(--ink); color: #fff; }
.btn-ink:hover { background: #22335a; }

/* process */
.steps { list-style: none; counter-reset: s; padding: 0; margin: var(--s4) 0 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--s3); position: relative; }
.steps::before { content: ""; position: absolute; top: 1.35rem; left: 1.375rem; right: calc((100% - 6rem) / 5 - 1.375rem); height: 6px; border-radius: 3px; background: linear-gradient(90deg, var(--water), var(--heat)); }
.steps li { counter-increment: s; position: relative; }
.steps li::before { content: counter(s); display: grid; place-items: center; width: 2.75rem; height: 2.75rem; border-radius: 50%; background: var(--paper); border: 4px solid var(--ink); font: 400 1.1rem var(--display); margin-bottom: var(--s2); position: relative; }
.steps p { margin-top: .4rem; color: var(--ink-soft); font-size: .98rem; }

/* faq */
.faq details { max-width: 48rem; background: var(--paper); border-radius: 18px; margin-top: var(--s2); }
.faq h2 + details { margin-top: var(--s4); }
.faq summary { cursor: pointer; list-style: none; padding: 1.1rem var(--s3); font-weight: 600; font-size: 1.1rem; display: flex; justify-content: space-between; gap: var(--s2); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 700 1.5rem/1 var(--display); color: var(--water); transition: transform .2s ease; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding: 0 var(--s3) var(--s3); color: var(--ink-soft); max-width: 62ch; }

/* contact */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s5); background: var(--water); color: #fff; }
.contact-text p { margin-top: var(--s2); max-width: 40ch; }
.contact-direct { display: flex; flex-direction: column; gap: .5rem; }
.contact-direct a:first-child { font: 400 1.8rem var(--display); text-decoration: none; }
.hours { opacity: .85; }
.lead-form { background: var(--paper); color: var(--ink); border-radius: 26px; padding: var(--s4) var(--s3); display: grid; gap: var(--s2); }
.lead-form label { display: grid; gap: .35rem; font-weight: 600; font-size: .95rem; }
.lead-form .opt { font-weight: 400; color: var(--ink-soft); }
.lead-form textarea { resize: vertical; }
.lead-form .consent { display: flex; gap: .6rem; align-items: flex-start; font-weight: 400; color: var(--ink-soft); }
.lead-form .consent input { margin-top: .25rem; width: 1.1rem; height: 1.1rem; accent-color: var(--water); }
.lead-form [aria-invalid="true"] { border-color: var(--heat); }
.form-msg { min-height: 1.5em; font-weight: 600; }
.form-msg.err { color: var(--heat); }
.form-msg.ok { color: #1c8a4a; }

/* footer */
.foot { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s4); padding: var(--s4) max(var(--s3), calc((100vw - var(--wrap)) / 2)); font-size: .92rem; color: var(--ink-soft); }

/* responsive */
@media (max-width: 960px) {
  .hero, .season, .signs-layout, .contact, .calc-form { grid-template-columns: 1fr; }
  .svc-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .steps::before { top: 1.35rem; bottom: 1.35rem; left: 1.3rem; right: auto; width: 6px; height: auto; background: linear-gradient(180deg, var(--water), var(--heat)); }
  .steps li { display: grid; grid-template-columns: auto 1fr; column-gap: var(--s2); }
  .steps li::before { grid-row: span 2; margin: 0; }
  .calc-out, .emergency { position: static; }
  .nav { display: none; }
  .phone { margin-left: auto; }
}
@media (max-width: 560px) {
  main > section { padding-top: var(--s5); padding-bottom: var(--s5); }
  .plans { grid-template-columns: 1fr; }
  .signs-list { grid-template-columns: 1fr; }
  .foot { grid-template-columns: 1fr; }
  .logo span { display: none; }
  .scheme { padding: var(--s2); border-radius: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .js #house .pipe { stroke-dashoffset: 0; }
  .js #house .flow { opacity: .9; }
}