:root {
  --bg: #0f1619;
  --bg-elevated: #172126;
  --bg-soft: #1c2a30;
  --surface: #22333a;
  --text: #e8eef1;
  --muted: #9aadb6;
  --line: rgba(232, 238, 241, 0.12);
  --accent: #c47a4a;
  --accent-2: #7eb6c8;
  --accent-soft: rgba(196, 122, 74, 0.18);
  --water: #4f8fa3;
  --ok: #6aae8a;
  --font: "Manrope", system-ui, sans-serif;
  --display: "Unbounded", "Manrope", sans-serif;
  --radius: 4px;
  --container: 1120px;
  --header: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(126, 182, 200, 0.14), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(196, 122, 74, 0.1), transparent 55%),
    linear-gradient(180deg, #0c1215 0%, var(--bg) 40%, #10181c 100%);
  line-height: 1.55;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-2);
  font-weight: 600;
}

.section {
  padding: clamp(4rem, 8vw, 6.5rem) 0;
}

.section__title {
  margin: 0 0 0.75rem;
  font-family: var(--display);
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.section__lead {
  margin: 0 0 2rem;
  max-width: 40rem;
  color: var(--muted);
}

h2 {
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 1rem;
  font-size: clamp(1.6rem, 3.2vw, 2.35rem);
}

h3 {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.85rem 1.4rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #d08a56, var(--accent));
  color: #1a100c;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s;
  box-shadow: 0 10px 30px rgba(196, 122, 74, 0.25);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(196, 122, 74, 0.35);
}

.btn:active {
  transform: translateY(0);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
  box-shadow: none;
}

.btn--ghost:hover {
  border-color: var(--accent-2);
  box-shadow: none;
}

.btn--sm {
  min-height: 40px;
  padding: 0.55rem 1rem;
  font-size: 0.92rem;
}

/* Header */
.header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header);
  backdrop-filter: blur(16px);
  background: rgba(15, 22, 25, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}

.header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(12, 18, 21, 0.9);
}

.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.logo__mark {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, #e8c2a4, var(--accent) 45%, transparent 46%),
    conic-gradient(from 210deg, var(--accent-2), var(--water), var(--accent), var(--accent-2));
  box-shadow: inset 0 0 0 3px rgba(15, 22, 25, 0.55);
  flex-shrink: 0;
}

.logo__text {
  font-family: var(--display);
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  gap: 1.25rem;
}

.nav a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--text);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.header__phone {
  font-weight: 600;
  font-size: 0.92rem;
  white-space: nowrap;
}

.burger {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  padding: 0;
  cursor: pointer;
  place-items: center;
  gap: 6px;
  flex-direction: column;
}

.burger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  transition: transform 0.25s var(--ease);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: calc(var(--header) + 2rem) 0 4.5rem;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(232, 238, 241, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 238, 241, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at 70% 40%, black 20%, transparent 75%);
}

.hero__glow {
  position: absolute;
  width: 55vw;
  height: 55vw;
  max-width: 700px;
  max-height: 700px;
  right: -8%;
  top: 10%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(126, 182, 200, 0.22), transparent 65%);
  filter: blur(10px);
  animation: pulseGlow 8s ease-in-out infinite;
}

.hero__pipes {
  position: absolute;
  inset: 0;
  opacity: 0.9;
}

.hero__pipes svg {
  width: 100%;
  height: 100%;
}

.pipe-line {
  stroke-dasharray: 1400;
  stroke-dashoffset: 1400;
  animation: drawPipe 3.2s var(--ease) forwards;
}

.pipe-line--delay {
  animation-delay: 0.45s;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero__brand {
  margin: 0 0 1rem;
  font-family: var(--display);
  font-size: clamp(1.15rem, 3vw, 1.75rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero__title {
  margin: 0 0 1.25rem;
  font-family: var(--display);
  font-size: clamp(2rem, 5.5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.hero__lead {
  margin: 0 0 2rem;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* About */
.about__grid,
.install__grid,
.company__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

.about__text p,
.company p,
.protect p {
  color: var(--muted);
}

.about__tagline {
  color: var(--text) !important;
  font-weight: 600;
}

.media-placeholder {
  aspect-ratio: 4 / 3;
  border: 1px dashed rgba(126, 182, 200, 0.35);
  background:
    linear-gradient(145deg, rgba(34, 51, 58, 0.9), rgba(23, 33, 38, 0.95)),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 10px,
      rgba(126, 182, 200, 0.04) 10px,
      rgba(126, 182, 200, 0.04) 20px
    );
  position: relative;
  overflow: hidden;
}

.media-placeholder--tall {
  aspect-ratio: 3 / 4;
  min-height: 420px;
}

.media-placeholder__frame {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 0.75rem;
  color: var(--muted);
  text-align: center;
  padding: 1rem;
  font-size: 0.95rem;
}

.media-placeholder__icon {
  width: 48px;
  height: 48px;
  border: 2px solid rgba(196, 122, 74, 0.55);
  border-radius: 50%;
  position: relative;
}

.media-placeholder__icon::before,
.media-placeholder__icon::after {
  content: "";
  position: absolute;
  background: var(--accent);
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.media-placeholder__icon::before {
  width: 18px;
  height: 2px;
}

.media-placeholder__icon::after {
  width: 2px;
  height: 18px;
}

/* Lead */
.lead-band {
  padding-block: 0;
}

.lead-band__inner {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 2rem;
  align-items: center;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  background:
    linear-gradient(135deg, rgba(196, 122, 74, 0.14), rgba(79, 143, 163, 0.12)),
    var(--bg-elevated);
  border: 1px solid var(--line);
}

.lead-band h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
}

.lead-band p {
  margin: 0;
  color: var(--muted);
}

.lead-form {
  display: grid;
  gap: 0.85rem;
}

.lead-form label,
.quiz-form label {
  display: grid;
  gap: 0.35rem;
}

.lead-form label span,
.quiz-form label span {
  font-size: 0.82rem;
  color: var(--muted);
}

.lead-form input,
.quiz-form input,
.quiz-input input {
  width: 100%;
  min-height: 48px;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 22, 25, 0.55);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}

.lead-form input:focus,
.quiz-form input:focus,
.quiz-input input:focus {
  border-color: var(--accent-2);
}

.form-note {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.lead-form--wide {
  margin-top: 2.5rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
}

.lead-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 0.85rem;
  align-items: end;
}

/* Advantages */
.adv-list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.adv-list li {
  background: var(--bg-elevated);
  padding: 1.5rem 1.25rem;
  display: grid;
  gap: 0.35rem;
  min-height: 130px;
  transition: background 0.25s;
}

.adv-list li:hover {
  background: var(--bg-soft);
}

.adv-list strong {
  font-family: var(--display);
  font-size: 1rem;
  font-weight: 600;
}

.adv-list span {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Catalog */
.catalog__panel {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.price {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--muted);
}

.price strong {
  color: var(--text);
  font-family: var(--display);
  font-size: 1.75rem;
  font-weight: 600;
}

.size {
  margin: 0 0 1.25rem;
  color: var(--accent-2);
  font-size: 0.95rem;
}

.comp-list {
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.comp-list li {
  position: relative;
  padding-left: 1.15rem;
  color: var(--muted);
}

.comp-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.catalog__note {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 1.5rem;
}

/* Quiz */
.quiz-box {
  margin-top: 1.5rem;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  position: relative;
}

.quiz-progress {
  height: 3px;
  background: rgba(232, 238, 241, 0.08);
  margin-bottom: 1rem;
  overflow: hidden;
}

.quiz-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.35s var(--ease);
}

.quiz-step-label {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.quiz-step {
  display: none;
}

.quiz-step.is-active {
  display: block;
  animation: fadeUp 0.4s var(--ease);
}

.quiz-hint {
  margin: -0.25rem 0 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.quiz-options {
  display: grid;
  gap: 0.7rem;
}

.quiz-options button {
  text-align: left;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 22, 25, 0.35);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.quiz-options button:hover {
  border-color: rgba(126, 182, 200, 0.55);
  transform: translateX(3px);
}

.quiz-options button.is-selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.quiz-options--text button {
  font-size: 0.95rem;
  line-height: 1.4;
}

.quiz-input {
  display: block;
  margin-bottom: 1rem;
}

.quiz-form {
  display: grid;
  gap: 0.85rem;
  max-width: 420px;
}

.quiz-back,
.quiz-next {
  margin-top: 1rem;
}

.quiz-back {
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  padding: 0.5rem 0;
}

.quiz-back:hover {
  color: var(--text);
}

/* Works / reviews */
.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.review {
  margin: 0;
  padding: 1.4rem;
  background: var(--bg-elevated);
  border-top: 2px solid var(--accent);
}

.review p {
  margin: 0 0 1rem;
}

.review footer {
  color: var(--muted);
  font-size: 0.9rem;
}

.reviews-note {
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.install-steps {
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
  counter-reset: install;
}

.install-steps li {
  counter-increment: install;
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
  color: var(--muted);
}

.install-steps li::before {
  content: counter(install, decimal-leading-zero);
  font-family: var(--display);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}

.stats {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.stats div {
  background: var(--bg-elevated);
  padding: 1.5rem 1.25rem;
  display: grid;
  gap: 0.35rem;
}

.stats strong {
  font-family: var(--display);
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent-2);
}

.stats span {
  color: var(--muted);
}

.protect__inner {
  max-width: 720px;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-left: 3px solid var(--accent-2);
  background: linear-gradient(90deg, rgba(126, 182, 200, 0.08), transparent);
}

/* Stages */
.stages-list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.stages-list li {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.stages-list__num {
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent);
}

.stages-list p {
  margin: 0;
  color: var(--muted);
}

/* FAQ */
.accordion {
  display: grid;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.accordion details {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
}

.accordion summary {
  cursor: pointer;
  padding: 1rem 1.15rem;
  font-weight: 600;
  list-style: none;
}

.accordion summary::-webkit-details-marker {
  display: none;
}

.accordion summary::after {
  content: "+";
  float: right;
  color: var(--accent-2);
}

.accordion details[open] summary::after {
  content: "–";
}

.accordion p {
  margin: 0;
  padding: 0 1.15rem 1.15rem;
  color: var(--muted);
}

.faq-cta {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.faq-cta h3 {
  margin: 0;
  font-family: var(--display);
}

/* Partners / contacts */
.partners__inner {
  max-width: 720px;
}

.partners__inner ul {
  margin: 0 0 1rem;
  padding-left: 1.1rem;
  color: var(--muted);
}

.partners__inner p {
  color: var(--muted);
}

.contacts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.contact-block {
  padding: 1.35rem;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  display: grid;
  gap: 0.45rem;
}

.contact-block a {
  font-weight: 600;
  transition: color 0.2s;
}

.contact-block a:hover {
  color: var(--accent-2);
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Footer */
.footer {
  padding: 2.5rem 0 6rem;
  border-top: 1px solid var(--line);
  background: #0b1114;
}

.footer__inner {
  display: grid;
  gap: 1.25rem;
}

.footer__brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.footer__brand p {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
}

.footer__links a:hover {
  color: var(--accent-2);
}

.footer__copy {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.float-tg {
  position: fixed;
  right: 1.1rem;
  bottom: 1.1rem;
  z-index: 90;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(145deg, #5aa9c4, #2f6f86);
  color: white;
  box-shadow: 0 10px 28px rgba(47, 111, 134, 0.45);
  transition: transform 0.25s var(--ease);
}

.float-tg:hover {
  transform: translateY(-3px) scale(1.04);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%) translateY(20px);
  z-index: 200;
  padding: 0.9rem 1.2rem;
  background: var(--ok);
  color: #0d1a14;
  font-weight: 600;
  border-radius: var(--radius);
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s var(--ease);
  max-width: min(90vw, 420px);
  text-align: center;
}

.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

.reveal--delay-1 {
  transition-delay: 0.1s;
}

.reveal--delay-2 {
  transition-delay: 0.2s;
}

.reveal--delay-3 {
  transition-delay: 0.3s;
}

@keyframes drawPipe {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes pulseGlow {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.85;
  }
  50% {
    transform: scale(1.08);
    opacity: 1;
  }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 960px) {
  .nav {
    position: fixed;
    inset: var(--header) 0 auto;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1rem 1rem;
    background: rgba(12, 18, 21, 0.96);
    border-bottom: 1px solid var(--line);
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--line);
  }

  .burger {
    display: grid;
  }

  .header__phone {
    display: none;
  }

  .about__grid,
  .install__grid,
  .company__grid,
  .lead-band__inner,
  .catalog__panel,
  .works-grid,
  .reviews-grid,
  .contacts-grid,
  .adv-list,
  .lead-form__row {
    grid-template-columns: 1fr;
  }

  .adv-list {
    grid-template-columns: 1fr 1fr;
  }

  .media-placeholder--tall {
    min-height: 280px;
    aspect-ratio: 4 / 3;
  }

  .stages-list li {
    grid-template-columns: 3rem 1fr;
  }
}

@media (max-width: 560px) {
  .adv-list {
    grid-template-columns: 1fr;
  }

  .hero {
    align-items: center;
    padding-bottom: 3rem;
  }

  .hero__title {
    font-size: clamp(1.85rem, 9vw, 2.4rem);
  }
}

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

  .reveal,
  .pipe-line,
  .hero__glow,
  .quiz-step.is-active {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
    stroke-dashoffset: 0 !important;
  }
}