:root {
  --blue: #0284c7;
  --blue-dark: #0369a1;
  --blue-light: #e0f2fe;
  --dark: #020617;
  --gray: #64748b;
  --gray-dark: #334155;
  --gray-light: #f8fafc;
  --border: #e2e8f0;
  --white: #ffffff;
  --green: #16a34a;
  --red: #dc2626;
  --radius: 18px;
  --shadow: 0 12px 35px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.5;
}

body.mobile-padding {
  padding-bottom: 72px;
}

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

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

button,
input,
select,
textarea {
  font: inherit;
}

.container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.section {
  padding: 72px 0;
}

.section-light {
  background: var(--gray-light);
}

.section-title {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-title.center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-title h2 {
  margin: 0;
  font-size: 38px;
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.section-title p {
  margin: 14px 0 0;
  color: var(--gray);
  font-size: 18px;
}

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  gap: 22px;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  flex-shrink: 0;
}

.logo span {
  font-size: 23px;
  font-weight: 900;
  color: var(--blue-dark);
}

.logo small {
  margin-top: 4px;
  color: var(--gray);
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
  font-size: 14px;
  font-weight: 700;
}

.nav a {
  color: var(--gray-dark);
  transition: color 0.2s;
}

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

.header-phone {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.15;
  flex-shrink: 0;
}

.header-phone a {
  font-size: 18px;
  font-weight: 900;
}

.header-phone a:hover {
  color: var(--blue);
}

.header-phone small {
  margin-top: 4px;
  color: var(--gray);
  font-size: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 22px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-weight: 800;
  cursor: pointer;
  transition: 0.2s;
  text-align: center;
}

.btn-primary {
  background: var(--blue);
  color: var(--white);
  box-shadow: 0 10px 22px rgba(2, 132, 199, 0.22);
}

.btn-primary:hover {
  background: var(--blue-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--white);
  color: var(--blue-dark);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: var(--blue-light);
  border-color: #bae6fd;
}

.btn-dark {
  background: var(--dark);
  color: var(--white);
}

.btn-dark:hover {
  background: #1e293b;
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.18), transparent 32%),
    linear-gradient(135deg, #f0f9ff 0%, #ffffff 48%, #f8fafc 100%);
  padding: 74px 0 64px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 44px;
  align-items: center;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 8px 12px;
  background: var(--blue-light);
  color: var(--blue-dark);
  font-size: 13px;
  font-weight: 800;
}

.hero h1 {
  margin: 0;
  font-size: 54px;
  line-height: 1.04;
  letter-spacing: -0.045em;
}

.hero h1 span {
  color: var(--blue-dark);
}

.hero-text {
  margin: 22px 0 0;
  max-width: 680px;
  color: var(--gray-dark);
  font-size: 20px;
}

.hero-actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-note {
  margin-top: 18px;
  color: var(--gray);
  font-size: 14px;
}

.hero-card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.hero-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}

.hero-card h3 {
  margin: 0;
  font-size: 25px;
  line-height: 1.15;
}

.hero-card p {
  color: var(--gray);
}

.price-big {
  margin: 20px 0;
  padding: 18px;
  border-radius: 18px;
  background: #f0f9ff;
}

.price-big small {
  color: var(--gray);
}

.price-big strong {
  display: block;
  margin-top: 2px;
  color: var(--blue-dark);
  font-size: 36px;
  line-height: 1;
}

.hero-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-list li {
  display: flex;
  gap: 10px;
  color: var(--gray-dark);
}

.hero-list li::before {
  content: "✓";
  color: var(--green);
  font-weight: 900;
}

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

.cards-grid.four {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.04);
  transition: 0.2s;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 15px;
  background: var(--blue-light);
  color: var(--blue-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 18px;
}

.card h3 {
  margin: 0;
  font-size: 21px;
}

.card p {
  margin: 12px 0 0;
  color: var(--gray);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.product-card {
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 18px;
  transition: 0.2s;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.04);
}

.product-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.product-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.product-badges span {
  border-radius: 999px;
  background: var(--blue-light);
  color: var(--blue-dark);
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 800;
}

.product-image {
  height: 210px;
  border-radius: 18px;
  background:
    linear-gradient(145deg, #f8fafc, #e0f2fe);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  overflow: hidden;
}

.ac-placeholder {
  width: 78%;
  height: 76px;
  background: var(--white);
  border-radius: 18px;
  border: 1px solid #dbeafe;
  position: relative;
  box-shadow: 0 14px 28px rgba(2, 132, 199, 0.12);
}

.ac-placeholder::before {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 14px;
  height: 6px;
  border-radius: 999px;
  background: #dbeafe;
}

.ac-placeholder::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 18px;
  width: 26px;
  height: 12px;
  border-radius: 999px;
  background: var(--blue-light);
}

.product-brand {
  color: var(--gray);
  font-size: 14px;
}

.product-card h3 {
  margin: 6px 0 0;
  font-size: 20px;
  line-height: 1.2;
}

.product-card p {
  color: var(--gray);
  font-size: 14px;
}

.product-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 14px 0;
  font-size: 14px;
}

.product-specs div {
  padding: 10px;
  border-radius: 12px;
  background: var(--gray-light);
}

.product-specs span {
  display: block;
  color: var(--gray);
  font-size: 12px;
}

.product-price {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.product-price small {
  color: var(--gray);
}

.product-price strong {
  display: block;
  color: var(--dark);
  font-size: 22px;
}

.product-price .with-install {
  margin-top: 6px;
  color: var(--blue-dark);
  font-size: 25px;
}

.product-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 16px;
}

.price-table {
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.price-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--border);
}

.price-row:last-child {
  border-bottom: 0;
}

.price-row strong {
  color: var(--blue-dark);
  font-size: 18px;
}

.cta {
  background:
    radial-gradient(circle at 15% 20%, rgba(56, 189, 248, 0.26), transparent 28%),
    linear-gradient(135deg, #0f172a, #075985);
  color: var(--white);
}

.cta-grid {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 34px;
  align-items: center;
}

.cta h2 {
  margin: 0;
  font-size: 38px;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.cta p {
  color: #dbeafe;
  font-size: 18px;
}

.form-box {
  background: var(--white);
  color: var(--dark);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.form-box h3 {
  margin: 0 0 16px;
  font-size: 24px;
}

.form {
  display: grid;
  gap: 12px;
}

.form input,
.form select,
.form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 15px;
  outline: none;
  background: var(--white);
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  border-color: var(--blue);
}

.form textarea {
  resize: vertical;
  min-height: 90px;
}

.form-note {
  font-size: 12px;
  color: var(--gray);
}

.form-success {
  display: none;
  margin-top: 12px;
  padding: 12px;
  border-radius: 12px;
  background: #dcfce7;
  color: #166534;
  font-size: 14px;
  font-weight: 700;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px 20px;
}

.faq-list summary {
  cursor: pointer;
  font-size: 18px;
  font-weight: 900;
}

.faq-list p {
  margin-bottom: 0;
  color: var(--gray);
}

.footer {
  background: #020617;
  color: var(--white);
  padding: 48px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr;
  gap: 34px;
}

.footer-logo {
  color: #38bdf8;
  font-size: 26px;
  font-weight: 900;
}

.footer p {
  color: #cbd5e1;
}

.footer h3 {
  margin: 0 0 16px;
}

.footer a {
  display: block;
  margin: 8px 0;
  color: #cbd5e1;
}

.footer a:hover {
  color: #38bdf8;
}

.footer-bottom {
  margin-top: 36px;
  padding: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #94a3b8;
  text-align: center;
  font-size: 13px;
}

.mobile-cta {
  display: none;
}

.page-hero {
  background: linear-gradient(135deg, #f0f9ff, #ffffff);
  padding: 54px 0;
  border-bottom: 1px solid var(--border);
}

.breadcrumbs {
  margin-bottom: 18px;
  color: var(--gray);
  font-size: 14px;
}

.breadcrumbs a {
  color: var(--blue-dark);
}

.page-hero h1 {
  margin: 0;
  max-width: 860px;
  font-size: 44px;
  line-height: 1.1;
  letter-spacing: -0.035em;
}

.page-hero p {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--gray-dark);
  font-size: 19px;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 34px;
  align-items: start;
}

.content {
  font-size: 18px;
}

.content h2 {
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.content p,
.content li {
  color: var(--gray-dark);
}

.content ul {
  padding-left: 22px;
}

.notice {
  border-radius: 18px;
  padding: 18px;
  background: var(--blue-light);
  color: var(--blue-dark);
  font-weight: 700;
}

.calc-result {
  display: none;
  margin-top: 14px;
  padding: 16px;
  border-radius: 16px;
  background: var(--blue-light);
  color: var(--blue-dark);
  font-weight: 900;
  font-size: 18px;
}

@media (max-width: 1080px) {
  .nav {
    display: none;
  }

  .header-phone {
    margin-left: auto;
  }

  .hero-grid,
  .cta-grid,
  .two-col {
    grid-template-columns: 1fr;
  }

  .cards-grid,
  .cards-grid.four,
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cta-grid {
    gap: 24px;
  }
}

@media (max-width: 720px) {
  body {
    padding-bottom: 72px;
  }

  .container {
    width: min(100% - 24px, 1180px);
  }

  .section {
    padding: 52px 0;
  }

  .header-inner {
    min-height: 66px;
  }

  .logo span {
    font-size: 20px;
  }

  .logo small,
  .header-phone small,
  .header-btn {
    display: none;
  }

  .header-phone a {
    font-size: 15px;
  }

  .hero {
    padding: 46px 0;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 35px;
  }

  .hero-text,
  .page-hero p {
    font-size: 17px;
  }

  .hero-actions {
    display: grid;
  }

  .section-title h2,
  .cta h2 {
    font-size: 30px;
  }

  .cards-grid,
  .cards-grid.four,
  .product-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .price-row {
    grid-template-columns: 1fr;
  }

  .product-image {
    height: 190px;
  }

  .mobile-cta {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 80;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    background: var(--white);
    border-top: 1px solid var(--border);
    box-shadow: 0 -12px 25px rgba(15, 23, 42, 0.12);
  }

  .mobile-cta a {
    min-height: 64px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 800;
    color: var(--gray-dark);
  }

  .mobile-cta a.primary {
    background: var(--blue);
    color: var(--white);
  }
}