/* ===========================================================
   NanoCem UT-9 · EASYMIX — приборный монохром + серо-зелёный
   =========================================================== */

:root {
  --ink: #1A1C1A;
  --paper: #F5F6F3;
  --accent: #6E7F6A;
  --muted: #8A8F88;
  --paper-2: #ECEEEA;
  --line: #D6D9D3;

  --max: 1200px;
  --pad: clamp(20px, 5vw, 80px);

  --f-display: 'Space Grotesk', system-ui, sans-serif;
  --f-body: 'Inter', system-ui, sans-serif;
  --f-mono: 'JetBrains Mono', ui-monospace, monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  -webkit-tap-highlight-color: rgba(110,127,106,.18);
}

img, svg, canvas { display: block; max-width: 100%; }

a { color: inherit; }

/* ---------- Типографика ---------- */
.h2 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 0.6em;
}

.eyebrow {
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0 0 1.4em;
  display: flex;
  align-items: center;
  gap: 0.7em;
}
.eyebrow .mark { color: var(--ink); flex: none; }

.lead {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  line-height: 1.4;
  color: var(--ink);
  max-width: 46ch;
  margin: -0.2em 0 2.4em;
}
.lead--mono {
  font-family: var(--f-mono);
  font-weight: 400;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

p { margin: 0 0 1.1em; }

/* ---------- Раскладка ---------- */
.wrap { max-width: var(--max); margin: 0 auto; padding-inline: var(--pad); }

.section { padding-block: clamp(64px, 9vw, 130px); border-top: 1px solid var(--line); }
.section--alt { background: var(--paper-2); }

/* ---------- Кнопки ---------- */
.btn {
  --bg: transparent;
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 0.85em 1.4em;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
  transition: background .25s var(--ease), color .25s var(--ease), transform .25s var(--ease);
}
.btn::after { content: "→"; transition: transform .25s var(--ease); }
.btn:hover::after { transform: translateX(4px); }
.btn--solid { --bg: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn--solid:hover { background: var(--accent); border-color: var(--accent); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }
.btn--lg { font-size: 1rem; padding: 1.05em 1.8em; }

/* ---------- Навигация ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  transition: background .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav__inner {
  max-width: var(--max); margin: 0 auto;
  padding: 0.9rem max(var(--pad), env(safe-area-inset-right)) 0.9rem max(var(--pad), env(safe-area-inset-left));
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.nav.scrolled {
  background: rgba(245,246,243,.92);
  backdrop-filter: blur(8px);
  border-bottom-color: var(--line);
}
.nav__brand {
  display: flex; align-items: center; gap: 0.5rem;
  text-decoration: none; color: var(--paper); font-family: var(--f-display);
  transition: color .3s var(--ease);
}
.nav.scrolled .nav__brand { color: var(--ink); }
.nav__diamond { color: currentColor; flex: none; }
.nav__wordmark { font-weight: 700; letter-spacing: 0.12em; }
.nav__sep { color: var(--accent); }
.nav__product { font-family: var(--f-mono); font-size: 0.8rem; color: inherit; opacity: .8; }

.nav__links { display: flex; gap: clamp(0.8rem, 2vw, 1.8rem); }
.nav__links a {
  text-decoration: none; color: var(--paper);
  font-family: var(--f-mono); font-size: 0.85rem; letter-spacing: 0.03em;
  padding: 0.3em 0; position: relative; transition: color .3s var(--ease);
}
.nav.scrolled .nav__links a { color: var(--ink); }
.nav__links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 1px;
  background: var(--accent); transition: right .25s var(--ease);
}
.nav__links a:hover::after, .nav__links a.active::after { right: 0; }
.nav__links a.active { color: var(--accent); }
.nav.scrolled .nav__links a.active { color: var(--accent); }

.nav__burger {
  display: none; flex-direction: column; gap: 5px; background: none; border: 0;
  padding: 6px; cursor: pointer;
}
.nav__burger span {
  width: 24px; height: 2px; background: var(--paper); transition: transform .3s var(--ease), opacity .3s var(--ease), background .3s var(--ease);
}
.nav.scrolled .nav__burger span { background: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  background: var(--ink); color: var(--paper); overflow: hidden;
  padding: 7rem var(--pad) 4.5rem;
}
.hero__canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero__overlay { position: relative; z-index: 2; max-width: var(--max); margin: 0 auto; width: 100%; }
.hero__eyebrow { color: var(--muted); }
.hero__title {
  font-family: var(--f-display); font-weight: 700;
  font-size: clamp(2.8rem, 6vw, 5.5rem); line-height: 1;
  letter-spacing: -0.02em; margin: 0 0 0.35em;
}
.hero__sub {
  font-family: var(--f-display); font-weight: 500;
  font-size: clamp(1.1rem, 2.4vw, 1.75rem); line-height: 1.35;
  max-width: 30ch; margin: 0 0 2em; color: var(--paper);
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-bottom: 2.6em; }
.hero__cta .btn { border-color: var(--paper); color: var(--paper); }
.hero__cta .btn--solid { background: var(--paper); color: var(--ink); }
.hero__cta .btn--solid:hover { background: var(--accent); border-color: var(--accent); color: var(--paper); }
.hero__cta .btn--ghost:hover { background: var(--paper); color: var(--ink); }

.hero__readouts { display: flex; flex-wrap: wrap; gap: clamp(1rem, 3vw, 2.6rem); }
.readout {
  font-family: var(--f-mono); font-size: 0.95rem; color: var(--muted);
  padding-left: 1rem; border-left: 1px solid var(--accent);
}
.readout b { color: var(--paper); font-weight: 500; }

.hero__caption {
  position: absolute; left: 50%; bottom: 1.6rem; transform: translateX(-50%);
  z-index: 2; margin: 0; width: 100%; max-width: var(--max); padding-inline: var(--pad);
  font-family: var(--f-mono); font-size: 0.8rem; letter-spacing: 0.04em; color: var(--muted);
  text-align: center;
}

/* ---------- Продукт ---------- */
.product__grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: clamp(2rem, 5vw, 5rem); align-items: start; }
.callout {
  background: var(--paper-2); border-left: 2px solid var(--accent);
  padding: 1.4rem 1.6rem; margin-top: 1.4rem;
}
.section--alt .callout { background: var(--paper); }
.callout .eyebrow { margin-bottom: 0.7em; }
.callout p:last-child { margin-bottom: 0; }

.product__cards { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.feature { background: var(--paper); padding: 1.6rem; }
.feature__icon { width: 48px; height: 48px; margin-bottom: 1rem; }
.feature__icon line, .feature__icon rect, .feature__icon path, .feature__icon circle {
  fill: none; stroke: var(--ink); stroke-width: 1.6; vector-effect: non-scaling-stroke;
}
.feature__icon .dot { fill: var(--accent); stroke: none; }
.feature__icon .fill-acc { fill: var(--accent); stroke: none; }
.feature__icon .check { stroke: var(--accent); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.feature__title { font-family: var(--f-display); font-weight: 500; font-size: 1.375rem; margin: 0 0 0.4em; }
.feature p { margin: 0; color: var(--ink); }

/* ---------- Принцип ---------- */
.principle__grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.principle__demo { border: 1px solid var(--line); background: var(--paper); padding: 1.4rem; }
.section--alt .principle__demo { background: var(--paper-2); }
#scaleCanvas { width: 100%; height: 220px; background: var(--ink); }
.principle__slider { margin-top: 1.2rem; }
.principle__labels {
  display: flex; justify-content: space-between; gap: 1rem;
  font-family: var(--f-mono); font-size: 0.78rem; color: var(--muted); margin-bottom: 0.6rem;
}
/* активна та подпись, которая соответствует текущему помолу */
.principle__labels span { color: var(--ink); transition: color .25s var(--ease), opacity .25s var(--ease); }
.principle__labels span.dim { color: var(--muted); opacity: .45; }
.principle__ends {
  display: flex; justify-content: space-between;
  font-family: var(--f-mono); font-size: 0.72rem; color: var(--ink); margin-top: 0.4rem; opacity: .7;
}

/* слайдеры (общий вид) */
input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 2px;
  background: var(--line); outline: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--paper); box-shadow: 0 0 0 1px var(--accent);
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%; background: var(--accent); border: 2px solid var(--paper);
}

/* ---------- Решения ---------- */
.solutions { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.sol { background: var(--paper); }
.sol__head {
  width: 100%; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1.2rem;
  background: none; border: 0; text-align: left; cursor: pointer;
  padding: clamp(1.2rem, 2.5vw, 1.8rem) clamp(1.2rem, 3vw, 2rem); color: var(--ink);
  transition: background .25s var(--ease);
}
.sol__head:hover { background: var(--paper-2); }
.sol__num { font-family: var(--f-mono); font-size: 0.85rem; color: var(--accent); }
.sol__kicker {
  display: block; font-family: var(--f-mono); font-size: 0.74rem; text-transform: uppercase;
  letter-spacing: 0.14em; color: var(--muted); margin-bottom: 0.25em;
}
.sol__title { font-family: var(--f-display); font-weight: 500; font-size: clamp(1.15rem, 2vw, 1.5rem); }
.sol__arrow { width: 14px; height: 14px; border-right: 2px solid var(--ink); border-bottom: 2px solid var(--ink);
  transform: rotate(45deg); transition: transform .3s var(--ease); flex: none; }
.sol[aria-expanded="true"] .sol__arrow,
.sol__head[aria-expanded="true"] .sol__arrow { transform: rotate(225deg); }

.sol__panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .4s var(--ease); }
.sol__panel-inner { overflow: hidden; }
.sol.open .sol__panel { grid-template-rows: 1fr; }
.sol__panel-inner > div, .sol__panel-inner > p {
  padding: 0 clamp(1.2rem, 3vw, 2rem) clamp(1.4rem, 3vw, 2rem);
}
.sol.open .sol__panel-inner { padding-top: 0.4rem; }
.sol__panel-inner {
  display: grid; grid-template-columns: 280px 1fr; gap: clamp(1.2rem, 3vw, 2.4rem);
  align-items: center;
}
.sol__visual {
  border: 1px solid var(--line); background: var(--paper-2);
  padding: 0.6rem; margin: 0 0 0 clamp(1.2rem, 3vw, 2rem);
}
.sol__visual svg { width: 100%; height: auto; }
.sol__panel-inner p { margin: 0; }

/* SVG-разрезы решений */
.sol__visual .rock { fill: var(--paper); stroke: var(--line); stroke-width: 1; }
.sol__visual .casing { fill: var(--paper-2); stroke: var(--ink); stroke-width: 1.4; }
.sol__visual .bore { fill: #fff; }
.sol__visual .surface { stroke: var(--ink); stroke-width: 1.4; }
.sol__visual .zone { fill: none; }
.sol__visual .water-zone, .sol__visual .aqua-zone, .sol__visual .water-body { fill: rgba(110,127,106,.10); }
.sol__visual .prod-zone { fill: rgba(26,28,26,.06); }
.sol__visual .dam { fill: var(--paper-2); stroke: var(--ink); stroke-width: 1.6; }
.sol__visual .tunnel { fill: #fff; stroke: var(--ink); stroke-width: 1.6; }
.sol__visual .cracks path { fill: none; stroke: var(--muted); stroke-width: 1.2; stroke-dasharray: 3 3; }
.sol__visual .bolts line { stroke: var(--ink); stroke-width: 1.6; }

.sol__visual .flow path { fill: none; stroke: var(--accent); stroke-width: 2; marker-end: none; opacity: 0; }
.sol__visual .water-flow path { stroke: var(--muted); }

.sol__visual .fill-zone,
.sol__visual .curtain,
.sol__visual .grout-ring {
  fill: var(--accent); opacity: 0;
}
.sol__visual .grout-ring { fill: none; stroke: var(--accent); stroke-width: 8; opacity: 0; }
.sol__visual .curtain { stroke: none; }

/* анимация при раскрытии (data-played) */
.sol.open .sol__visual .fill-zone,
.sol.open .sol__visual .curtain { animation: fillIn .9s var(--ease) .25s forwards; }
.sol.open .sol__visual .grout-ring { animation: ringIn .9s var(--ease) .25s forwards; }
.sol.open .sol__visual .flow path { animation: flowDash 1.4s linear .1s forwards; }

@keyframes fillIn { to { opacity: .55; } }
@keyframes ringIn { to { opacity: .6; } }
@keyframes flowDash {
  0% { opacity: 0; stroke-dasharray: 4 8; stroke-dashoffset: 60; }
  20% { opacity: 1; }
  100% { opacity: .9; stroke-dasharray: 4 8; stroke-dashoffset: 0; }
}

/* ---------- Нефтедобыча: интро-схема ---------- */
.oil__intro {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem); align-items: center; margin-bottom: clamp(2.6rem, 5vw, 4rem);
}
.oil__scheme { border: 1px solid var(--line); background: var(--paper-2); padding: 1.2rem; }
.oil__scheme svg { width: 100%; height: auto; }

/* элементы разреза */
.oil__scheme .rock { fill: var(--paper); stroke: var(--line); stroke-width: 1; }
.oil__scheme .surface { stroke: var(--ink); stroke-width: 1.4; }
.oil__scheme .casing { fill: var(--paper-2); stroke: var(--ink); stroke-width: 1.4; }
.oil__scheme .bore { fill: #fff; }
.oil__scheme .tubing { fill: var(--paper-2); stroke: var(--ink); stroke-width: 1; }
.oil__scheme .packer { fill: var(--ink); }
.oil__scheme .oil-zone { fill: rgba(26,28,26,.07); }
.oil__scheme .water-zone { fill: rgba(110,127,106,.10); }
.oil__scheme .perf line { stroke: var(--ink); stroke-width: 1.6; }
.oil__scheme .flow path { fill: none; stroke-width: 2; opacity: 0; }
.oil__scheme .water-flow path { stroke: var(--muted); }
.oil__scheme .oil-flow path { stroke: var(--ink); }
.oil__scheme .inject-flow path { stroke: var(--accent); stroke-width: 2.4; }
.oil__scheme .fill-zone { fill: var(--accent); opacity: 0; }

.oil__scheme.in .fill-zone { animation: fillIn .9s var(--ease) .45s forwards; }
.oil__scheme.in .flow path { animation: flowDash 1.5s linear .15s forwards; }

.legend { list-style: none; margin: 1.2rem 0 0; padding: 0; display: grid; gap: 0.55rem; }
.legend li {
  display: flex; align-items: center; gap: 0.6rem;
  font-family: var(--f-mono); font-size: 0.76rem; color: var(--muted); line-height: 1.3;
}
.sw { width: 14px; height: 10px; flex: none; display: block; }
.sw--acc { background: var(--accent); opacity: .55; }
.sw--oil { background: rgba(26,28,26,.20); }
.sw--line { background: none; border: 1.5px solid var(--ink); }

/* список преимуществ */
.ticks { list-style: none; margin: 1.4rem 0 0; padding: 0; display: grid; gap: 0.7rem; }
.ticks li { position: relative; padding-left: 1.7rem; }
.ticks li::before {
  content: ""; position: absolute; left: 0; top: 0.55em;
  width: 9px; height: 9px; border: 1.5px solid var(--accent); transform: rotate(45deg);
}

/* подзаголовок внутри секции */
.sub-h {
  font-family: var(--f-mono); font-weight: 500; font-size: 0.8125rem;
  text-transform: uppercase; letter-spacing: 0.16em; color: var(--ink);
  margin: clamp(2.4rem, 5vw, 3.4rem) 0 1.4rem;
  display: flex; align-items: center; gap: 1rem;
}
.sub-h::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.solutions + .sub-h { margin-top: clamp(2.6rem, 5vw, 3.6rem); }

/* этапы работ */
.steps { list-style: none; margin: 0 0 2.4rem; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.step { background: var(--paper); padding: 1.4rem; display: flex; gap: 1rem; align-items: flex-start; }
.section--alt .step { background: var(--paper-2); }
.step__n { font-family: var(--f-mono); font-size: 0.8rem; color: var(--accent); flex: none; padding-top: 0.15em; }
.step h4 { font-family: var(--f-display); font-weight: 500; font-size: 1.0625rem; margin: 0 0 0.4em; }
.step p { margin: 0; font-size: 0.95rem; color: var(--ink); }

/* текстовая панель решения (без визуала) */
.sol__panel-inner--text { grid-template-columns: 1fr; }

/* ---------- Характеристики ---------- */
.spec-table { width: 100%; border-collapse: collapse; }
.spec-table tr { border-bottom: 1px solid var(--line); }
.spec-table th, .spec-table td { text-align: left; padding: 0.7rem 0.4rem; vertical-align: top; }
.spec-table th { font-weight: 400; color: var(--ink); width: 55%; }
.spec-table td { font-family: var(--f-mono); font-size: 0.95rem; font-variant-numeric: tabular-nums; color: var(--ink); }
.specs__note { margin-top: 1.2rem; color: var(--muted); font-size: 0.95rem; }

/* ---------- Кейсы ---------- */
.cases { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-bottom: 2rem; }
.case { background: var(--paper); padding: clamp(1.4rem, 3vw, 2rem); }
.case__head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 1rem; margin-bottom: 1rem; }
.case__title { font-family: var(--f-display); font-weight: 500; font-size: 1.5rem; margin: 0; }
.case__stats { display: flex; gap: 1.4rem; }
.stat { display: flex; flex-direction: column; align-items: flex-end; }
.stat .num { font-family: var(--f-mono); font-weight: 500; font-size: 1.4rem; color: var(--accent); font-variant-numeric: tabular-nums; line-height: 1; }
.stat i { font-style: normal; font-family: var(--f-mono); font-size: 0.7rem; color: var(--muted); margin-top: 0.3em; }
.stat.status { font-family: var(--f-mono); font-size: 0.8rem; color: var(--ink); border: 1px solid var(--line); padding: 0.3em 0.6em; align-self: center; }
/* строка периода данных */
.cases__asof {
  font-family: var(--f-mono); font-size: 0.78rem; line-height: 1.5;
  color: var(--muted); margin: -1.6rem 0 2rem; max-width: 70ch;
}

/* сводка по фонду */
.summary {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); margin-bottom: 2rem;
}
.summary__cell { background: var(--paper); padding: 1.2rem 1.4rem; display: flex; flex-direction: column; gap: 0.4rem; }
.summary__cell .num {
  font-family: var(--f-mono); font-weight: 500; font-size: 1.75rem; line-height: 1;
  color: var(--accent); font-variant-numeric: tabular-nums;
}
.summary__cell i {
  font-style: normal; font-family: var(--f-mono); font-size: 0.72rem;
  letter-spacing: 0.06em; color: var(--muted);
}

/* мета-строка скважины */
.case__meta {
  font-family: var(--f-mono); font-size: 0.72rem; line-height: 1.5;
  color: var(--muted); margin: -0.4rem 0 0.2rem;
}

/* легенда графика */
.case__legend {
  display: flex; align-items: center; flex-wrap: wrap; gap: 0.4rem 0.5rem;
  font-family: var(--f-mono); font-size: 0.7rem; color: var(--muted); margin: -0.8rem 0 1rem;
}
.ln { width: 16px; height: 0; flex: none; display: inline-block; }
.ln--oil { border-top: 2px solid var(--accent); }
.ln--water { border-top: 2px dashed var(--muted); margin-left: 0.7rem; }

.case__chart { margin: 0.4rem 0 1.2rem; }
.caseCanvas { width: 100%; height: 130px; }
.case__text { margin: 0; font-size: 0.98rem; }

/* таблица «до и после» */
.result-wrap { overflow-x: auto; margin-bottom: 2rem; }
.result-table { width: 100%; border-collapse: collapse; min-width: 560px; }
.result-table thead th {
  font-family: var(--f-mono); font-weight: 500; font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted);
  text-align: right; padding: 0 0.6rem 0.7rem; border-bottom: 1px solid var(--line);
}
.result-table thead th:first-child { text-align: left; }
.result-table tbody tr { border-bottom: 1px solid var(--line); }
.result-table tbody th {
  text-align: left; font-family: var(--f-mono); font-weight: 500;
  padding: 0.8rem 0.6rem; color: var(--ink);
}
.result-table td {
  text-align: right; padding: 0.8rem 0.6rem;
  font-family: var(--f-mono); font-size: 0.95rem;
  font-variant-numeric: tabular-nums; color: var(--muted);
}
.result-table td.good { color: var(--accent); }
.result-note { font-family: var(--f-mono); font-size: 0.72rem; color: var(--muted); margin: 0.9rem 0 0; }

/* ---------- Контакты ---------- */
.contacts__grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.reqs { margin: 0; display: grid; gap: 0; }
.reqs > div { display: grid; grid-template-columns: 180px 1fr; gap: 1rem; padding: 0.9rem 0; border-bottom: 1px solid var(--line); }
.reqs dt { font-family: var(--f-mono); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); margin: 0; }
.reqs dd { margin: 0; }
.reqs a { color: var(--accent); text-decoration: none; }
.reqs a:hover { text-decoration: underline; }
.contacts__cta { display: flex; flex-wrap: wrap; justify-content: flex-start; gap: 0.8rem; }

/* ---------- Футер ---------- */
.footer { background: var(--ink); color: var(--paper); padding: clamp(2.4rem, 5vw, 3.6rem) 0 2rem; }
.footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 1.4rem; }
.footer__brand { display: flex; align-items: center; gap: 0.8rem; text-decoration: none; color: var(--paper); font-family: var(--f-mono); font-size: 0.9rem; }
.footer__links { display: flex; flex-wrap: wrap; gap: 1.2rem; }
.footer__links a { text-decoration: none; color: var(--muted); font-family: var(--f-mono); font-size: 0.82rem; transition: color .25s var(--ease); }
.footer__links a:hover { color: var(--paper); }
.footer__tu { max-width: var(--max); margin: 2rem auto 0; padding-inline: var(--pad); font-family: var(--f-mono); font-size: 0.72rem; color: var(--muted); }

/* ---------- Скролл-ревилы ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Доступность ---------- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.btn:focus-visible { outline-offset: 4px; }

/* ===========================================================
   Адаптив
   =========================================================== */
@media (max-width: 1023px) {
  .product__grid, .principle__grid, .contacts__grid { grid-template-columns: 1fr; }
  .principle__grid { gap: 2rem; }
  .cases { grid-template-columns: 1fr; }
  .sol__panel-inner { grid-template-columns: 1fr; }
  .sol__visual { margin: 0; max-width: 360px; }
  .oil__intro { grid-template-columns: 1fr; }
  .oil__scheme { max-width: 460px; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .summary { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  .nav__links {
    position: fixed; inset: 0 0 auto 0; top: 0; flex-direction: column; gap: 0;
    background: var(--paper); padding: 5rem var(--pad) 2rem;
    transform: translateY(-100%); transition: transform .35s var(--ease);
    box-shadow: 0 12px 30px rgba(0,0,0,.08); border-bottom: 1px solid var(--line);
  }
  .nav__links.open { transform: none; }
  .nav__links a { color: var(--ink); padding: 1rem 0; border-bottom: 1px solid var(--line); font-size: 1rem; }
  .nav.scrolled .nav__links a { color: var(--ink); }
  .nav__burger { display: flex; z-index: 60; }
  .nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); background: var(--ink); }
  .nav__burger.open span:nth-child(2) { opacity: 0; }
  .nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); background: var(--ink); }
  .nav__product { display: none; }

  .product__cards { grid-template-columns: 1fr; }

  /* таблица характеристик — карточный режим */
  .spec-table, .spec-table tbody { display: block; }
  .spec-table tr { display: flex; flex-direction: column; padding: 0.7rem 0; }
  .spec-table th, .spec-table td { width: auto; padding: 0; }
  .spec-table th { color: var(--muted); font-size: 0.85rem; margin-bottom: 0.2rem; }

  .case__head { flex-direction: column; align-items: flex-start; }
  .case__stats { width: 100%; justify-content: flex-start; gap: 2rem; }
  .stat { align-items: flex-start; }
  .reqs > div { grid-template-columns: 1fr; gap: 0.2rem; }

  /* --- Hero под телефон: подпись в потоке, без перекрытия --- */
  .hero {
    min-height: 100svh;
    padding: 5.5rem var(--pad) 2.4rem;
    justify-content: center;
  }
  .hero__sub { max-width: none; }
  .hero__cta { flex-direction: column; align-items: stretch; gap: 0.7rem; }
  .hero__cta .btn { justify-content: center; width: 100%; }
  .hero__readouts { gap: 0.7rem 1.4rem; }
  .hero__caption {
    position: static; transform: none; text-align: left;
    width: auto; max-width: none; padding-inline: 0;
    margin-top: 2.2rem;
  }

  /* --- Тап-зоны и плотность --- */
  .sol__head { grid-template-columns: auto 1fr auto; gap: 0.8rem; }
  .sol__visual { max-width: none; }
  #scaleCanvas { height: 180px; }
  .caseCanvas { height: 120px; }

  /* --- Контакты / футер стек --- */
  .steps { grid-template-columns: 1fr; }
  .oil__scheme { max-width: none; }
  .contacts__cta { flex-direction: column; }
  .contacts__cta .btn { width: 100%; justify-content: center; }
  .footer__inner { flex-direction: column; align-items: flex-start; gap: 1.6rem; }
  .footer__links { gap: 0.8rem 1.2rem; }
}

@media (max-width: 480px) {
  .case__stats { gap: 1.4rem; }
  .stat .num { font-size: 1.25rem; }
  .hero__title { word-break: break-word; }
}

@media (max-width: 360px) {
  :root { --pad: 16px; }
  .hero__readouts { flex-direction: column; gap: 0.6rem; }
}

/* ===========================================================
   prefers-reduced-motion
   =========================================================== */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn::after, .sol__arrow, .nav, .nav__brand, .nav__links a::after { transition: none; }
  .sol.open .sol__visual .fill-zone,
  .sol.open .sol__visual .curtain { opacity: .55; animation: none; }
  .sol.open .sol__visual .grout-ring { opacity: .6; animation: none; }
  .sol.open .sol__visual .flow path { opacity: .9; stroke-dasharray: 4 8; stroke-dashoffset: 0; animation: none; }
  .sol__panel { transition: none; }
  .oil__scheme .fill-zone { opacity: .55; animation: none; }
  .oil__scheme .flow path { opacity: .9; stroke-dasharray: 4 8; stroke-dashoffset: 0; animation: none; }
}