/* Цвета и размеры — меняются в одном месте */
:root {
  --ink: #111214;
  --muted: #5d6168;
  --line: #d9dce1;
  --bg: #f6f7f9;
  --bg-tint: #eceef2;
  --card: #ffffff;
  --accent: #ff4f00;
  --accent-dark: #e04500;
  --radius: 14px;
  --wrap: 1240px;
  --font-head: "Montserrat", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font: 400 17px/1.55 var(--font-body);
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--font-head); margin: 0; line-height: 1.05; }
p { margin: 0; }
ul, ol { list-style: none; margin: 0; padding: 0; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.accent { color: var(--accent); }

/* Шапка */
.header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(246, 247, 249, .9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header__in { display: flex; align-items: center; gap: 32px; height: 68px; }
.logo { display: flex; flex-direction: column; text-decoration: none; font-family: var(--font-head); font-weight: 900; line-height: .95; }
.logo__a { font-size: 15px; }
.logo__b { font-size: 15px; color: var(--accent); }
.nav { display: flex; gap: 24px; margin-left: auto; font-size: 15px; font-weight: 500; }
.nav a { text-decoration: none; color: var(--muted); }
.nav a:hover { color: var(--ink); }
.header__phone { font-family: var(--font-head); font-weight: 700; font-size: 16px; text-decoration: none; white-space: nowrap; }

/* Кнопки */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 52px; padding: 0 26px; border-radius: 10px;
  font: 600 16px/1.2 var(--font-body); text-decoration: none; text-align: center;
  transition: background .15s, color .15s, border-color .15s;
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-dark); }
.btn--ghost { border: 1.5px solid var(--ink); }
.btn--ghost:hover { background: var(--ink); color: #fff; }
.btn--light { background: #fff; color: var(--accent); flex-shrink: 0; }
.btn--light:hover { background: var(--ink); color: #fff; }

/* Первый экран */
.hero {
  overflow: hidden;
  background:
    linear-gradient(115deg, transparent 0 18%, rgba(255,255,255,.75) 24%, transparent 34%, transparent 48%, rgba(255,255,255,.6) 56%, transparent 64%),
    linear-gradient(180deg, #e9ebef 0%, #f6f7f9 70%);
}
.hero__in { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); align-items: center; gap: 24px; min-height: min(calc(100vh - 68px), 860px); padding-top: 40px; padding-bottom: 40px; }
.eyebrow { font-size: 15px; font-weight: 500; color: var(--muted); margin-bottom: 20px; }
.hero__title { display: flex; flex-direction: column; font-weight: 900; font-size: clamp(44px, 6.6vw, 96px); line-height: .9; letter-spacing: -.02em; }
.hero__lead { font-family: var(--font-head); font-weight: 600; font-size: clamp(20px, 2.2vw, 30px); line-height: 1.25; margin: 28px 0 36px; max-width: 620px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero__note { margin-top: 40px; font-size: 14px; color: var(--muted); }
.hero__media img { width: auto; max-width: 100%; max-height: min(78vh, 720px); margin-left: auto; mix-blend-mode: multiply; }
.fade { -webkit-mask-image: radial-gradient(ellipse 60% 62% at 52% 52%, #000 55%, transparent 100%); mask-image: radial-gradient(ellipse 60% 62% at 52% 52%, #000 55%, transparent 100%); }

/* Секции */
.section { padding: 96px 0; }
.section--tint { background: var(--bg-tint); }
.h2 { font-weight: 900; font-size: clamp(34px, 5vw, 60px); letter-spacing: -.015em; margin-bottom: 48px; }
.lead { font-size: 19px; color: var(--muted); max-width: 620px; }
.footnote { margin-top: 24px; font-size: 13px; color: var(--muted); }
.icon { width: 48px; height: 48px; fill: none; stroke: var(--accent); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.icon .fill-bg { fill: var(--bg-tint); }

/* Что такое */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about .h2 { margin-bottom: 28px; }
.about__media img { border-radius: var(--radius); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 64px; }
.stat { display: flex; flex-direction: column; gap: 6px; padding: 0 28px; border-left: 1px solid var(--line); }
.stat:first-child { padding-left: 0; border-left: 0; }
.stat .icon { margin-bottom: 12px; }
.stat b { font-family: var(--font-head); font-weight: 900; font-size: clamp(24px, 2.6vw, 36px); line-height: 1.1; white-space: nowrap; }
.stat span { color: var(--muted); }

/* Сравнение */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.compare__item { margin: 0; }
.compare__item img { border-radius: var(--radius); mix-blend-mode: multiply; }
.compare__item figcaption { margin-top: 20px; }
.compare__item h3 { font-weight: 900; font-size: clamp(24px, 2.6vw, 34px); margin-bottom: 8px; }
.compare__item p { color: var(--muted); }

/* Применение */
.uses { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.use { display: flex; flex-direction: column; }
.use img { border-radius: var(--radius); background: #fff; object-fit: cover; }
.use__num { font-family: var(--font-head); font-weight: 900; font-size: 40px; color: var(--accent); margin: 18px 0 6px; line-height: 1; }
.use h3 { font-weight: 800; font-size: 20px; margin-bottom: 10px; }
.use p { font-size: 15px; color: var(--muted); }

/* Преимущества */
.adv { display: grid; grid-template-columns: repeat(5, 1fr); }
.adv li { padding: 0 24px; border-left: 1px solid #cdd1d7; }
.adv li:first-child { padding-left: 0; border-left: 0; }
.adv .icon { width: 64px; height: 64px; margin-bottom: 20px; }
.adv h3 { font-weight: 800; font-size: 20px; margin-bottom: 10px; }
.adv p { color: var(--muted); font-size: 16px; }

/* Характеристики */
.specs { display: grid; grid-template-columns: 1.3fr 1fr; gap: 64px; align-items: end; }
.table { width: 100%; border-collapse: collapse; font-size: 18px; }
.table th, .table td { padding: 14px 0; border-bottom: 1px solid var(--line); text-align: left; }
.table th { font-weight: 400; color: var(--muted); }
.table td { font-family: var(--font-head); font-weight: 800; white-space: nowrap; padding-left: 24px; }
.chart { margin: 0; }
.chart figcaption { font-family: var(--font-head); font-weight: 800; font-size: 18px; margin-bottom: 24px; }
.chart__bars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; height: 320px; align-items: end; border-bottom: 1px solid var(--line); }
.bar { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; position: relative; }
.bar i { display: block; width: 100%; height: calc(var(--v) / 65 * 85%); background: #9a9ea6; border-radius: 4px 4px 0 0; }
.bar--accent i { background: var(--accent); }
.bar b { font-family: var(--font-head); font-weight: 900; font-size: 26px; margin-bottom: 8px; }
.bar span { position: absolute; bottom: -32px; font-size: 15px; color: var(--muted); white-space: nowrap; }
.specs + .footnote { margin-top: 56px; }

/* Документы */
.docs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.docs a { display: flex; flex-direction: column; gap: 14px; text-decoration: none; font-weight: 500; font-size: 15px; }
.docs img { border-radius: 8px; border: 1px solid var(--line); background: #fff; aspect-ratio: 210 / 297; object-fit: cover; object-position: top; transition: transform .2s, box-shadow .2s; }
.docs a:hover img { transform: translateY(-4px); box-shadow: 0 16px 32px rgba(0,0,0,.12); }
.docs__more { margin-top: 32px; }
.docs__more a { color: var(--accent); font-weight: 600; text-decoration: none; }

/* Поставка */
.supply { display: grid; grid-template-columns: .8fr 1.2fr; gap: 56px; align-items: center; }
.supply__media img { mix-blend-mode: multiply; }
.supply .h2 { margin-bottom: 32px; }
.facts { margin: 0 0 32px; }
.facts div { display: grid; grid-template-columns: 180px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.facts dt { font-weight: 600; }
.facts dd { margin: 0; color: var(--muted); }
.cta { display: flex; align-items: center; gap: 24px; padding: 28px 32px; border-radius: var(--radius); background: var(--accent); color: #fff; font-weight: 600; font-size: 18px; line-height: 1.4; }
.contacts { display: flex; flex-wrap: wrap; gap: 12px 32px; margin-top: 28px; font-family: var(--font-head); font-weight: 700; font-size: 20px; }
.contacts a { text-decoration: none; }
.contacts a:hover { color: var(--accent); }

/* Подвал */
.footer { background: var(--ink); color: #b9bcc2; padding: 48px 0; font-size: 14px; }
.footer__in { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 48px; }
.footer p + p { margin-top: 4px; }
.footer__name { color: #fff; font-family: var(--font-head); font-weight: 800; font-size: 16px; }
.footer__copy { grid-column: 1 / -1; padding-top: 24px; border-top: 1px solid #2a2c31; color: #7d8189; }

/* Планшет */
@media (max-width: 1080px) {
  .nav { display: none; }
  .header__phone { margin-left: auto; }
  .uses { grid-template-columns: repeat(3, 1fr); }
  .adv { grid-template-columns: repeat(3, 1fr); row-gap: 40px; }
  .adv li:nth-child(4) { padding-left: 0; border-left: 0; }
  .stats { grid-template-columns: repeat(2, 1fr); row-gap: 40px; }
  .stat:nth-child(3) { padding-left: 0; border-left: 0; }
  .specs { grid-template-columns: 1fr; gap: 72px; }
  .docs { grid-template-columns: repeat(2, 1fr); }
}

/* Телефон */
@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .section { padding: 64px 0; }
  .h2 { margin-bottom: 32px; }
  .hero__in { grid-template-columns: 1fr; min-height: 0; max-height: none; padding-top: 32px; }
  .hero__media { order: -1; max-width: 360px; margin: 0 auto; }
  .hero__media img { max-height: 44vh; margin: 0 auto; }
  .hero__actions .btn { width: 100%; }
  .about, .compare, .supply { grid-template-columns: 1fr; gap: 32px; }
  .stats { margin-top: 40px; }
  .stat { padding: 0 16px; }
  .stat b { white-space: normal; font-size: 24px; }
  .uses { grid-template-columns: repeat(2, 1fr); gap: 28px 16px; }
  .use__num { font-size: 32px; }
  .use h3 { font-size: 18px; }
  .adv { grid-template-columns: 1fr; row-gap: 32px; }
  .adv li { padding: 0; border-left: 0; }
  .table { font-size: 15px; }
  .chart__bars { height: 240px; }
  .docs { gap: 16px; }
  .supply__media { max-width: 300px; margin: 0 auto; }
  .facts div { grid-template-columns: 1fr; gap: 2px; }
  .cta { flex-direction: column; align-items: stretch; padding: 24px; font-size: 16px; }
  .contacts { font-size: 18px; }
  .footer__in { grid-template-columns: 1fr; }
}

/* Калькулятор */
.calc { background: #fff; }
.calc .h2 { margin-bottom: 16px; }
.calc__lead { margin-bottom: 40px; }
.calc__step { display: flex; align-items: center; gap: 12px; font-family: var(--font-head); font-weight: 800; font-size: 20px; margin-bottom: 20px; }
.calc__step span { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: #fff; font-size: 16px; flex-shrink: 0; }
.calc__types { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; margin-bottom: 48px; }
.calc__type {
  display: flex; flex-direction: column; gap: 10px; padding: 10px 10px 16px; text-align: left; cursor: pointer;
  background: var(--bg); border: 2px solid transparent; border-radius: var(--radius);
  font: 700 16px/1.2 var(--font-head); color: var(--ink); transition: border-color .15s, background .15s;
}
.calc__type img { border-radius: 8px; aspect-ratio: 4 / 3; object-fit: cover; width: 100%; }
.calc__type:hover { border-color: #c4c8ce; }
.calc__type.is-active { border-color: var(--accent); background: #fff4ee; }
.calc__type:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.calc__body { display: grid; grid-template-columns: 1fr 440px; gap: 48px; align-items: start; }
.calc__fields { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px 20px; margin-bottom: 16px; }
.field { display: flex; flex-direction: column; gap: 8px; font-size: 15px; font-weight: 500; margin-bottom: 16px; }
.calc__fields .field { margin-bottom: 0; }
.field select, .field__box, .calc__lead-form input {
  width: 100%; min-height: 52px; border: 1.5px solid var(--line); border-radius: 10px; background: var(--bg);
  font: 500 17px var(--font-body); color: var(--ink);
}
.field select { padding: 0 14px; }
.field__box { display: flex; align-items: center; }
.field__box:focus-within, .field select:focus, .calc__lead-form input:focus { outline: none; border-color: var(--accent); background: #fff; }
.field__box input { flex: 1; min-width: 0; height: 49px; padding: 0 14px; border: 0; background: transparent; font: inherit; color: inherit; outline: none; }
.field__box i { font-style: normal; color: var(--muted); padding-right: 14px; }
.field--range label { display: flex; justify-content: space-between; align-items: baseline; }
.field--range output { font-family: var(--font-head); font-weight: 800; font-size: 20px; color: var(--accent); }
.field--range input { width: 100%; accent-color: var(--accent); }
.field small { color: var(--muted); font-size: 13px; font-weight: 400; }

.calc__result { position: sticky; top: 92px; padding: 28px; border-radius: var(--radius); background: var(--bg-tint); }
.calc__bags { display: flex; align-items: baseline; gap: 12px; margin: 8px 0 20px; }
.calc__bags b { font-family: var(--font-head); font-weight: 900; font-size: 64px; line-height: 1; color: var(--accent); }
.calc__bags span { font-family: var(--font-head); font-weight: 700; font-size: 18px; }
.calc__nums { margin: 0 0 16px; }
.calc__nums div { display: flex; justify-content: space-between; gap: 16px; padding: 10px 0; border-bottom: 1px solid #d3d6dc; }
.calc__nums dt { color: var(--muted); }
.calc__nums dd { margin: 0; font-family: var(--font-head); font-weight: 800; white-space: nowrap; }
.calc__note { font-size: 13px; color: var(--muted); }

.check { padding: 16px; margin-bottom: 8px; border-radius: 10px; background: #fff; }
.check__title { font-weight: 600; margin-bottom: 10px; }
.check__row { display: flex; justify-content: space-between; gap: 12px; padding: 6px 0 6px 14px; border-left: 4px solid; font-size: 15px; }
.check__row + .check__row { margin-top: 6px; }
.check__row span { text-align: right; }
.check__row--ok { border-color: #1f9d55; } .check__row--ok span { color: #1a7f46; font-weight: 600; }
.check__row--maybe { border-color: #e8a200; } .check__row--maybe span { color: #9a6b00; font-weight: 600; }
.check__row--no { border-color: #b7bbc2; } .check__row--no span { color: var(--muted); }
.check__scale { margin-top: 12px; font-size: 14px; }
.check__scale summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.check__scale ul { margin-top: 10px; }
.check__scale li { display: grid; grid-template-columns: 1fr 72px 72px; align-items: center; padding: 5px 0; border-bottom: 1px solid var(--line); }
.check__scale li.is-current { font-weight: 700; }
.check__scale .check__head { color: var(--muted); font-size: 12px; }
.check__scale i { font-style: normal; justify-self: center; }
.dot { width: 14px; height: 14px; border-radius: 50%; }
.dot--ok { background: #1f9d55; } .dot--maybe { background: #e8a200; } .dot--no { background: #d3d6dc; }

.calc__lead-form { display: flex; flex-direction: column; gap: 10px; margin-top: 24px; padding-top: 24px; border-top: 1px solid #d3d6dc; }
.calc__form-title { font-family: var(--font-head); font-weight: 800; font-size: 18px; margin-bottom: 4px; }
.calc__lead-form input { padding: 0 14px; background: #fff; }
.calc__lead-form .btn { border: 0; cursor: pointer; width: 100%; }
.calc__copy { background: none; border: 0; padding: 6px; font: 600 15px var(--font-body); color: var(--muted); cursor: pointer; text-decoration: underline; }
.calc__form-msg { font-size: 14px; color: var(--ink); min-height: 1em; }

@media (max-width: 1080px) {
  .calc__types { grid-template-columns: repeat(3, 1fr); }
  .calc__body { grid-template-columns: 1fr; }
  .calc__result { position: static; }
}
@media (max-width: 720px) {
  .calc__types { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .calc__type { font-size: 14px; }
  .calc__fields { grid-template-columns: 1fr; }
  .calc__result { padding: 20px; }
  .calc__bags b { font-size: 52px; }
}
.calc__how { margin-top: 32px; padding: 24px; border-radius: var(--radius); border: 1.5px dashed var(--line); font-size: 15px; color: var(--muted); }
.calc__how-title { font-family: var(--font-head); font-weight: 800; color: var(--ink); margin-bottom: 10px; }
.calc__how ul { list-style: disc; padding-left: 20px; display: grid; gap: 6px; }
.check__hint { margin-top: 10px; font-size: 14px; color: var(--accent-dark); font-weight: 600; }
@media (max-width: 1080px) {
  /* на узких экранах пояснение уходит под результат */
  .calc__body { display: flex; flex-direction: column; gap: 0; }
  .calc__form { display: contents; }
  .calc__result { order: 1; margin-top: 24px; }
  .calc__how { order: 2; }
}