/* ВДИХ — рекуператоры. Стили прототипа. Без внешних шрифтов и CDN: всё локально, LCP не блокируется. */

:root {
  --ink: #08192a;
  --ink-2: #23455c;
  --ink-soft: #5b7686;
  --bg: #f2f7f9;
  --bg-2: #ffffff;
  --line: #dbe6ec;
  --accent: #0d9488;
  --accent-2: #06b6d4;
  --accent-soft: #e3f6f4;
  --warm: #ef7c3c;
  --warm-soft: #fdece1;
  --shadow-sm: 0 1px 2px rgba(8, 25, 42, .06), 0 4px 14px rgba(8, 25, 42, .05);
  --shadow-md: 0 2px 6px rgba(8, 25, 42, .06), 0 18px 40px rgba(8, 25, 42, .09);
  --r: 20px;
  --r-sm: 12px;
  --maxw: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.02em; font-weight: 750; }
h1 { font-size: clamp(2rem, 4.6vw, 3.4rem); }
h2 { font-size: clamp(1.55rem, 3vw, 2.35rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.section { padding: 84px 0; }
.section--tight { padding: 56px 0; }
.section--alt { background: var(--bg-2); }
.section--ink { background: linear-gradient(160deg, #08192a, #0f3040 70%); color: #eaf6f8; }
.section--ink h2, .section--ink h3 { color: #fff; }
.section--ink .lead, .section--ink .muted { color: #a9c6d2; }
.lead { font-size: 1.12rem; color: var(--ink-2); max-width: 68ch; }
.muted { color: var(--ink-soft); font-size: .93rem; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.eyebrow {
  display: inline-block; font-size: .78rem; font-weight: 700; letter-spacing: .09em;
  text-transform: uppercase; color: var(--accent); background: var(--accent-soft);
  padding: 6px 12px; border-radius: 999px; margin-bottom: 18px;
}
.section--ink .eyebrow { color: #7ff0e4; background: rgba(255, 255, 255, .08); }
.head { max-width: 62ch; margin-bottom: 40px; }
.head--center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 15px 26px; border-radius: 999px; border: 0; cursor: pointer;
  font: inherit; font-weight: 650; font-size: 1rem; text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn--primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; box-shadow: 0 10px 26px rgba(13, 148, 136, .32); }
.btn--primary:hover { box-shadow: 0 16px 34px rgba(13, 148, 136, .4); }
.btn--ghost { background: #fff; color: var(--ink); border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.btn--light { background: rgba(255, 255, 255, .12); color: #fff; border: 1px solid rgba(255, 255, 255, .28); }
.btn--sm { padding: 11px 18px; font-size: .92rem; }
.btn--block { width: 100%; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(242, 247, 249, .86);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header__in { display: flex; align-items: center; gap: 18px; height: 68px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.01em; color: var(--ink); font-size: 1.16rem; }
.logo:hover { text-decoration: none; }
.logo__mark { width: 30px; height: 30px; flex: 0 0 auto; }
.nav { display: flex; gap: 22px; margin-left: auto; }
.nav a { color: var(--ink-2); font-size: .96rem; font-weight: 550; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); text-decoration: none; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.lang {
  display: inline-flex; align-items: center; justify-content: center; min-width: 42px; height: 34px;
  border: 1px solid var(--line); border-radius: 999px; background: #fff;
  font-size: .84rem; font-weight: 700; color: var(--ink-2); letter-spacing: .04em;
}
.lang:hover { text-decoration: none; border-color: var(--accent); color: var(--accent); }
.burger { display: none; width: 42px; height: 34px; border: 1px solid var(--line); border-radius: 10px; background: #fff; cursor: pointer; }
.burger span, .burger span::before, .burger span::after {
  display: block; position: relative; width: 16px; height: 2px; margin: 0 auto; background: var(--ink); border-radius: 2px;
}
.burger span::before, .burger span::after { content: ""; position: absolute; left: 0; }
.burger span::before { top: -5px; }
.burger span::after { top: 5px; }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; padding: 72px 0 84px; }
.hero::before {
  content: ""; position: absolute; inset: -30% -10% auto -10%; height: 120%;
  background:
    radial-gradient(46% 40% at 18% 22%, rgba(6, 182, 212, .20), transparent 70%),
    radial-gradient(40% 38% at 82% 12%, rgba(13, 148, 136, .18), transparent 70%),
    radial-gradient(38% 36% at 70% 82%, rgba(239, 124, 60, .14), transparent 70%);
  z-index: 0;
}
.hero__in { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 54px; align-items: center; }
.hero h1 { margin-bottom: 18px; }
.hero__sub { font-size: 1.18rem; color: var(--ink-2); max-width: 54ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0 22px; }
.hero__bullets { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.hero__bullets li { display: flex; align-items: flex-start; gap: 10px; color: var(--ink-2); font-size: .98rem; }
.hero__bullets svg { flex: 0 0 auto; margin-top: 3px; }

/* ---------- airflow scheme ---------- */
.scheme { background: #fff; border-radius: var(--r); box-shadow: var(--shadow-md); padding: 22px; }
.scheme svg { display: block; width: 100%; height: auto; }
.flow { stroke-linecap: round; fill: none; stroke-width: 6; }
/* оба потока анимируются по направлению своей траектории; цвет меняется градиентом
   на теплообменнике: приток холодный → тёплый, вытяжка тёплая → охлаждённая */
.flow--exhaust { stroke: url(#gExhaust); stroke-dasharray: 14 16; animation: flow 2.4s linear infinite; }
.flow--supply { stroke: url(#gSupply); stroke-dasharray: 14 16; animation: flow 2.4s linear infinite; }
@keyframes flow { to { stroke-dashoffset: -60; } }
.scheme__caption { font-size: .88rem; color: var(--ink-soft); margin: 14px 2px 0; }
.core-glow { animation: pulse 3s ease-in-out infinite; transform-origin: center; }
@keyframes pulse { 0%, 100% { opacity: .55; } 50% { opacity: 1; } }

/* ---------- stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat { background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 24px; box-shadow: var(--shadow-sm); }
.stat__val { font-size: clamp(1.8rem, 3.4vw, 2.5rem); font-weight: 800; letter-spacing: -.03em; color: var(--accent); line-height: 1; }
.stat__label { font-size: .9rem; color: var(--ink-soft); margin-top: 10px; }

/* ---------- cards grid ---------- */
.grid { display: grid; gap: 22px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r);
  padding: 26px; box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: #c6dde5; }
.card__icon { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: var(--accent-soft); margin-bottom: 16px; }
.card h3 { margin-bottom: 8px; }
.card p { margin-bottom: 0; color: var(--ink-2); font-size: .98rem; }
.card__solution {
  margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line);
  font-size: .95rem; color: var(--ink);
}
.card__solution b { display: block; font-size: .76rem; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; }
.card--step { position: relative; padding-top: 34px; }
.card--step .num {
  position: absolute; top: -14px; left: 24px; width: 40px; height: 40px; border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff;
  display: grid; place-items: center; font-weight: 800; box-shadow: 0 8px 18px rgba(13, 148, 136, .3);
}

/* ---------- quiz ---------- */
.quiz { background: #fff; border-radius: 26px; box-shadow: var(--shadow-md); padding: 34px; max-width: 860px; margin: 0 auto; }
.quiz__bar { height: 6px; border-radius: 999px; background: var(--accent-soft); overflow: hidden; margin-bottom: 22px; }
.quiz__bar i { display: block; height: 100%; width: 25%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .35s ease; }
/* без uppercase: заглавная «З» неотличима от цифры 3 в «Крок 1 з 4» */
.quiz__meta { font-size: .88rem; letter-spacing: .02em; color: var(--ink-soft); margin-bottom: 8px; }
.quiz__q { font-size: 1.4rem; font-weight: 700; margin-bottom: 20px; }
.quiz__opts { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.opt {
  text-align: left; padding: 16px 18px; border-radius: var(--r-sm); border: 1.5px solid var(--line);
  background: #fff; font: inherit; font-weight: 600; cursor: pointer; color: var(--ink);
  transition: border-color .16s ease, background .16s ease, transform .16s ease;
}
.opt:hover { border-color: var(--accent); background: var(--accent-soft); transform: translateY(-2px); }
.quiz__nav { display: flex; align-items: center; gap: 16px; margin-top: 20px; }
.link-btn { background: none; border: 0; padding: 0; font: inherit; color: var(--ink-soft); cursor: pointer; text-decoration: underline; }
.link-btn:hover { color: var(--accent); }
.quiz__step[hidden], .quiz__result[hidden] { display: none; }
.result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 8px 0 18px; }
.result-tile { background: var(--bg); border-radius: var(--r-sm); padding: 18px; }
.result-tile__label { font-size: .78rem; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-soft); }
.result-tile__val { font-size: 1.7rem; font-weight: 800; color: var(--ink); letter-spacing: -.02em; margin-top: 6px; }
.result-tile__hint { font-size: .82rem; color: var(--ink-soft); margin-top: 6px; }
.result-model { display: flex; gap: 16px; align-items: center; background: var(--accent-soft); border-radius: var(--r-sm); padding: 18px; margin-bottom: 16px; }
.result-model strong { display: block; font-size: 1.1rem; }

/* ---------- temp widget ---------- */
.tempbox { background: #fff; border-radius: var(--r); box-shadow: var(--shadow-md); padding: 28px; }
.tempbox__row { display: grid; grid-template-columns: 1fr auto; gap: 14px; align-items: center; margin-bottom: 18px; }
.tempbox label { font-size: .95rem; color: var(--ink-2); font-weight: 600; }
.tempbox output { font-variant-numeric: tabular-nums; font-weight: 800; color: var(--accent); min-width: 82px; text-align: right; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.tempbox__result { background: linear-gradient(135deg, var(--warm-soft), var(--accent-soft)); border-radius: var(--r-sm); padding: 20px; text-align: center; }
.tempbox__result b { display: block; font-size: 2.4rem; letter-spacing: -.03em; color: var(--ink); font-variant-numeric: tabular-nums; }

/* ---------- демо шума ---------- */
.noise { background: #fff; border-radius: 26px; box-shadow: var(--shadow-md); padding: 30px; max-width: 900px; margin: 0 auto; }
.noise__btns { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.noise-btn {
  display: flex; flex-direction: column; gap: 2px; align-items: flex-start;
  padding: 16px 18px; border-radius: var(--r-sm); border: 1.5px solid var(--line);
  background: #fff; font: inherit; cursor: pointer; color: var(--ink); text-align: left;
  transition: border-color .16s ease, background .16s ease, transform .16s ease;
}
.noise-btn:hover { border-color: var(--accent); background: var(--accent-soft); transform: translateY(-2px); }
.noise-btn[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent); }
.noise-btn b { font-size: 1.32rem; letter-spacing: -.02em; }
.noise-btn span { font-weight: 650; font-size: .95rem; }
.noise-btn small { color: var(--ink-soft); font-size: .82rem; }
.noise-btn--loud { border-style: dashed; }
.noise-btn--loud b { color: var(--warm); }
.noise__bar { display: flex; align-items: center; gap: 16px; margin: 22px 0 6px; min-height: 44px; }
.noise__viz { display: flex; align-items: flex-end; gap: 4px; height: 34px; }
.noise__viz i { width: 5px; height: 5px; border-radius: 3px; background: var(--line); transition: background .2s ease; }
.noise__viz.is-on i { background: linear-gradient(var(--accent-2), var(--accent)); animation: viz 1s ease-in-out infinite; }
.noise__viz.is-on i:nth-child(2) { animation-delay: .12s; }
.noise__viz.is-on i:nth-child(3) { animation-delay: .24s; }
.noise__viz.is-on i:nth-child(4) { animation-delay: .06s; }
.noise__viz.is-on i:nth-child(5) { animation-delay: .3s; }
.noise__viz.is-on i:nth-child(6) { animation-delay: .18s; }
.noise__viz.is-on i:nth-child(7) { animation-delay: .36s; }
@keyframes viz {
  0%, 100% { height: 6px; }
  50% { height: calc(8px + 26px * var(--lvl, .4)); }
}
.noise__now { font-size: .9rem; font-weight: 650; color: var(--accent); }
.noise__note { margin: 0; max-width: 78ch; }

/* ---------- compare table ---------- */
.table-scroll { overflow-x: auto; border-radius: var(--r); border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow-sm); }
table.cmp { width: 100%; border-collapse: collapse; min-width: 720px; }
table.cmp th, table.cmp td { padding: 15px 18px; text-align: left; border-bottom: 1px solid var(--line); font-size: .96rem; }
table.cmp thead th { background: var(--bg); font-size: .86rem; letter-spacing: .04em; text-transform: uppercase; color: var(--ink-soft); }
table.cmp tbody th { font-weight: 650; color: var(--ink-2); }
/* наша колонка идёт первой и подсвечена — клиент видит преимущество сразу, без прокрутки */
table.cmp--compare td:nth-child(2), table.cmp--compare thead th:nth-child(2) { background: var(--accent-soft); font-weight: 650; }
table.cmp tr:last-child td, table.cmp tr:last-child th { border-bottom: 0; }

/* ---------- подсказка «таблицу можно прокрутить» ----------
   Стоит НАД таблицей в общем потоке: ничего не перекрывает и видна сразу. */
.table-wrap { display: flex; flex-direction: column; }
.scroll-hint {
  align-self: flex-end; margin: 0 2px 10px;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 14px; border-radius: 999px;
  background: var(--ink); color: #fff; font-size: .82rem; font-weight: 650;
  box-shadow: 0 8px 22px rgba(8, 25, 42, .28);
  animation: hint-in .3s ease both;
  pointer-events: none;
}
.scroll-hint.is-gone { opacity: 0; transform: translateY(6px); transition: opacity .3s ease, transform .3s ease; }
.scroll-hint svg { animation: hint-swipe 1.5s ease-in-out infinite; }
@keyframes hint-in { from { opacity: 0; transform: translateY(8px); } }
@keyframes hint-swipe {
  0%, 100% { transform: translateX(-4px); }
  50% { transform: translateX(4px); }
}
@media (prefers-reduced-motion: reduce) {
  .scroll-hint, .scroll-hint svg { animation: none; }
  .noise__viz.is-on i { animation: none; height: calc(8px + 20px * var(--lvl, .4)); }
}

/* ---------- products ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.chip {
  border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 9px 16px;
  font: inherit; font-size: .9rem; font-weight: 600; color: var(--ink-2); cursor: pointer;
  transition: all .16s ease;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.products { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.product { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease; }
.product:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.product[hidden] { display: none; }
.product__media { position: relative; background: linear-gradient(150deg, #eaf4f7, #f7fbfc); padding: 14px; display: grid; place-items: center; }
.product__media img { width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: contain; }
.product__badge { position: absolute; top: 14px; left: 14px; background: var(--ink); color: #fff; font-size: .74rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; padding: 6px 10px; border-radius: 999px; }
.product__body { padding: 20px 22px 22px; display: flex; flex-direction: column; flex: 1; }
.product__brand { font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); font-weight: 700; }
.product__name { font-size: 1.08rem; font-weight: 700; margin: 4px 0 10px; }
.product__blurb { font-size: .94rem; color: var(--ink-2); margin-bottom: 14px; }
.specs { list-style: none; margin: 0 0 16px; padding: 0; display: grid; gap: 7px; font-size: .9rem; }
.specs li { display: flex; justify-content: space-between; gap: 12px; border-bottom: 1px dotted var(--line); padding-bottom: 6px; }
.specs span:first-child { color: var(--ink-soft); }
.specs span:last-child { font-weight: 650; text-align: right; }
.product__price-row { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.product__foot { margin-top: 16px; display: flex; align-items: center; gap: 10px; }
.product__foot .btn { flex: 1 1 auto; }
.stock {
  display: inline-flex; align-items: center; gap: 6px; font-size: .84rem; font-weight: 650;
  color: #0f766e; background: var(--accent-soft); padding: 5px 11px; border-radius: 999px; white-space: nowrap;
}
.stock svg { color: var(--accent); }
.price { font-size: 1.35rem; font-weight: 800; letter-spacing: -.02em; white-space: nowrap; }
.price small { display: block; font-size: .74rem; font-weight: 600; color: var(--ink-soft); letter-spacing: 0; }
.empty-note { display: none; padding: 26px; text-align: center; color: var(--ink-soft); }

/* ---------- попап карточки товара ---------- */
.product__media { border: 0; width: 100%; cursor: pointer; font: inherit; }
.product__media:hover svg { transform: scale(1.04); }
.product__media svg { transition: transform .2s ease; }

.modal {
  width: min(760px, calc(100vw - 32px));
  max-height: min(88vh, 900px);
  padding: 30px clamp(20px, 3vw, 34px) 34px;
  border: 0; border-radius: 22px;
  background: var(--bg-2); color: var(--ink);
  box-shadow: 0 30px 80px rgba(8, 25, 42, .34);
  overflow: auto;
}
.modal::backdrop { background: rgba(6, 20, 32, .55); backdrop-filter: blur(3px); }
.modal[open] { animation: modal-in .22s ease; }
@keyframes modal-in { from { opacity: 0; transform: translateY(14px); } }
.modal__close {
  position: absolute; top: 14px; right: 16px; width: 38px; height: 38px;
  border: 1px solid var(--line); border-radius: 50%; background: var(--bg);
  font-size: 1.4rem; line-height: 1; color: var(--ink-2); cursor: pointer;
}
.modal__close:hover { border-color: var(--accent); color: var(--accent); }
.modal__head { display: grid; grid-template-columns: 168px 1fr; gap: 24px; align-items: start; margin-bottom: 24px; }
.modal__pic { background: linear-gradient(150deg, #eaf4f7, #f7fbfc); border-radius: var(--r-sm); padding: 10px; }
.modal__pic img { width: 100%; height: auto; display: block; }
.modal__cta { margin-top: 14px; }
.modal .stock { margin-top: 4px; }
table.cmp--modes { min-width: 560px; }
table.cmp--modes tbody th { font-weight: 650; color: var(--ink); }
table.cmp--modes td:last-child, table.cmp--modes thead th:last-child { background: transparent; font-weight: 600; }
table.cmp--modes tbody tr:first-child { background: var(--accent-soft); }
.acc__pic { background: linear-gradient(150deg, #eaf4f7, #f7fbfc); border-radius: var(--r-sm); padding: 10px; margin-bottom: 16px; }
.acc__pic img { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: contain; display: block; }
.modal__head h3 { margin: 6px 0 10px; font-size: 1.28rem; }
.modal__price { font-size: 1.6rem; font-weight: 800; letter-spacing: -.02em; margin: 10px 0 14px; white-space: nowrap; }
.modal__price small { display: block; font-size: .8rem; font-weight: 600; color: var(--ink-soft); letter-spacing: 0; }
.modal h4 { font-size: .82rem; letter-spacing: .09em; text-transform: uppercase; color: var(--accent); margin: 26px 0 10px; }
.modal p { color: var(--ink-2); }
.product__badge--static { position: static; display: inline-block; }
ul.feat { list-style: none; margin: 0 0 4px; padding: 0; display: grid; gap: 9px; }
ul.feat li { display: flex; gap: 10px; align-items: flex-start; font-size: .97rem; color: var(--ink-2); }
ul.feat li svg { flex: 0 0 auto; margin-top: 3px; color: var(--accent); }
table.spec-table { width: 100%; border-collapse: collapse; font-size: .94rem; }
table.spec-table th, table.spec-table td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
table.spec-table th { font-weight: 600; color: var(--ink-soft); width: 46%; }
table.spec-table td { font-weight: 600; }
table.spec-table tr:last-child th, table.spec-table tr:last-child td { border-bottom: 0; }
.table-scroll--plain { box-shadow: none; }

/* ---------- список предложения в квизе ---------- */
.result-h { font-size: .8rem; letter-spacing: .09em; text-transform: uppercase; color: var(--accent); margin: 26px 0 10px; }
ul.offer { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
ul.offer li {
  display: flex; justify-content: space-between; gap: 16px; align-items: baseline;
  padding: 13px 16px; background: var(--bg); border-radius: var(--r-sm); font-size: .97rem;
}
ul.offer li b { white-space: nowrap; }
ul.offer li:last-child { background: var(--accent-soft); }
ul.offer--alt li:last-child { background: var(--bg); }
ul.notes { margin: 0; padding-left: 20px; display: grid; gap: 8px; color: var(--ink-2); font-size: .95rem; }

/* ---------- accordion ---------- */
.faq { max-width: 880px; margin: 0 auto; display: grid; gap: 12px; }
details.qa { background: #fff; border: 1px solid var(--line); border-radius: var(--r-sm); box-shadow: var(--shadow-sm); overflow: hidden; }
details.qa summary {
  cursor: pointer; padding: 18px 54px 18px 22px; font-weight: 650; position: relative; list-style: none;
}
details.qa summary::-webkit-details-marker { display: none; }
details.qa summary::after {
  content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%);
  font-size: 1.5rem; font-weight: 400; color: var(--accent); transition: transform .2s ease;
}
details.qa[open] summary::after { content: "–"; }
details.qa[open] summary { color: var(--accent); }
details.qa .qa__body { padding: 0 22px 20px; color: var(--ink-2); font-size: .98rem; }

/* ---------- honest install block ---------- */
.notice {
  border-left: 4px solid var(--warm); background: var(--warm-soft);
  border-radius: 0 var(--r-sm) var(--r-sm) 0; padding: 20px 22px; color: #6a3512;
}
.notice b { color: #4d2409; }

/* ---------- form ---------- */
.form { display: grid; gap: 14px; max-width: 520px; }
.form input, .form textarea {
  width: 100%; padding: 15px 16px; border-radius: var(--r-sm); border: 1px solid rgba(255, 255, 255, .28);
  background: rgba(255, 255, 255, .1); color: #fff; font: inherit;
}
.form input::placeholder, .form textarea::placeholder { color: rgba(233, 246, 249, .65); }
.form input:focus, .form textarea:focus { outline: 2px solid var(--accent-2); outline-offset: 1px; }
.form textarea { min-height: 96px; resize: vertical; }
.form__note { font-size: .82rem; color: #9dbcc9; }
.form__msg { font-size: .95rem; font-weight: 600; }
.contact-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: start; }
.msgr { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }

/* ---------- footer ---------- */
.site-footer { background: #061420; color: #9dbcc9; padding: 54px 0 26px; font-size: .94rem; }
.site-footer a { color: #d8ecf2; }
.site-footer h4 { color: #fff; font-size: .82rem; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 14px; }
.footer-cols { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 34px; }
.footer-cols ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.footer-bottom { margin-top: 34px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .1); display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; font-size: .84rem; }

/* floating messengers */
.float { position: fixed; right: 18px; bottom: 18px; z-index: 70; display: grid; gap: 10px; }
.float a {
  width: 50px; height: 50px; border-radius: 50%; display: grid; place-items: center;
  background: #fff; box-shadow: var(--shadow-md); color: var(--ink);
  transition: transform .16s ease;
}
.float a:hover { transform: scale(1.08); text-decoration: none; }
.float a.is-call { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; }

/* ---------- reveal animation ----------
   Скрываем только когда JS точно есть (html.js ставится инлайн-скриптом в head).
   Без JS или при неработающем IntersectionObserver контент виден сразу. */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .5s ease, transform .5s ease; }
.js .reveal.is-in { opacity: 1; transform: none; }
.js .reveal:nth-child(2) { transition-delay: .06s; }
.js .reveal:nth-child(3) { transition-delay: .12s; }
.js .reveal:nth-child(4) { transition-delay: .18s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal, .reveal { opacity: 1; transform: none; transition: none; }
  .flow--exhaust, .flow--supply, .core-glow { animation: none; }
  .btn:hover, .card:hover, .product:hover { transform: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .hero__in { grid-template-columns: 1fr; gap: 34px; }
  .grid--4, .stats { grid-template-columns: repeat(2, 1fr); }
  .grid--3, .products { grid-template-columns: repeat(2, 1fr); }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .contact-cols { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 760px) {
  body { font-size: 16px; }
  .section { padding: 60px 0; }
  .nav { display: none; }
  .nav.is-open {
    display: grid; position: absolute; top: 68px; left: 0; right: 0; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow-md); padding: 8px 20px 16px;
  }
  .nav.is-open a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .burger { display: block; }
  .header-actions { margin-left: auto; }
  .grid--3, .grid--2, .grid--4, .products, .stats, .result-grid { grid-template-columns: 1fr; }
  .noise { padding: 22px 18px; border-radius: var(--r); }
  .noise__btns { grid-template-columns: 1fr 1fr; }
  .modal { padding: 26px 18px 28px; border-radius: 18px; max-height: 92vh; }
  .modal__head { grid-template-columns: 1fr; gap: 14px; }
  .modal__pic { max-width: 180px; }
  table.spec-table th { width: 50%; }
  ul.offer li { flex-direction: column; gap: 4px; }
  .quiz { padding: 22px; border-radius: var(--r); }
  .footer-cols { grid-template-columns: 1fr; }
  /* в шапке на мобильном оставляем логотип, язык и бургер: кнопка CTA дублируется в hero */
  .header-actions .btn { display: none; }
  /* меньше плавающих кнопок — меньше перекрытия текста */
  .float { right: 12px; bottom: 12px; gap: 8px; }
  .float a { width: 44px; height: 44px; }
  .float a[aria-label="Viber"] { display: none; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eaf4f7; --ink-2: #b9d2dc; --ink-soft: #8fadba;
    --bg: #071522; --bg-2: #0b1e2c; --line: #1d3a4a;
    --accent: #2dd4bf; --accent-2: #38bdf8; --accent-soft: #102f36;
    --warm: #f59e6b; --warm-soft: #2a1a11;
  }
  .card, .stat, .scheme, .quiz, .tempbox, .product, details.qa, .table-scroll, .btn--ghost, .lang, .chip, .burger { background: var(--bg-2); }
  .btn--ghost, .lang, .chip { color: var(--ink-2); }
  .product__media { background: linear-gradient(150deg, #0d2634, #0b1e2c); }
  table.cmp thead th { background: #081b28; }
  .result-tile { background: #081b28; }
  .notice { color: #f3d7c4; }
  .notice b { color: #ffe8d7; }
  .site-header { background: rgba(7, 21, 34, .88); }
  .nav.is-open { background: var(--bg-2); }
  .float a { background: var(--bg-2); color: var(--ink); }
}