:root {
  --primary: #0f4c81;
  --primary-dark: #08324f;
  --accent: #0ea5e9;
  --dark: #0b1120;
  --text: #111827;
  --muted: #6b7280;
  --light: #f6f8fb;
  --border: #e5e7eb;
  --white: #ffffff;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.10);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
}

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

img {
  max-width: 100%;
}

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .95);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--primary-dark);
  color: var(--white);
  display: grid;
  place-items: center;
  font-size: 16px;
  font-weight: 900;
}

.brand-name {
  margin: 0;
  font-size: 20px;
  font-weight: 900;
}

.brand-subtitle {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav a {
  font-size: 13px;
  font-weight: 700;
  color: #4b5563;
}

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

.menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--white);
  font-size: 22px;
  cursor: pointer;
}

.mobile-nav {
  display: none;
  border-top: 1px solid var(--border);
  padding: 16px 0 20px;
}

.mobile-nav a {
  display: block;
  padding: 12px 0;
  font-weight: 700;
  color: #475569;
}

.mobile-nav.active {
  display: block;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: .2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 12px 24px rgba(15, 76, 129, .20);
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  border-color: var(--border);
  background: #fff;
  color: var(--dark);
}

.hero {
  color: #fff;
  background: linear-gradient(135deg, #0b1120 0%, #0f2f4d 58%, #0f4c81 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
  min-height: 520px;
  padding: 78px 0;
}

.eyebrow {
  margin: 0 0 14px;
  color: #bae6fd;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .18em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(42px, 5.5vw, 68px);
  line-height: 1.04;
}

.hero-copy {
  margin: 24px 0 0;
  color: #d7e0ea;
  font-size: 19px;
  line-height: 1.75;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-card {
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 24px;
  background: rgba(255, 255, 255, .08);
}

.hero-card img {
  width: 100%;
  height: 280px;
  object-fit: contain;
  display: block;
  padding: 14px;
  border-radius: 18px;
  background: #fff;
}

.hero-card ul {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.hero-card li {
  color: #e5edf5;
  font-weight: 700;
}

.section {
  padding: 86px 0;
}

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

.section-title {
  max-width: 840px;
  margin: 0 0 38px;
}

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

.kicker {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .20em;
  text-transform: uppercase;
}

h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 50px);
  line-height: 1.12;
}

h3 {
  margin: 0;
  font-size: 22px;
  line-height: 1.25;
}

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

.lead {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 22px;
}

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

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

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

.card {
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .05);
  overflow: hidden;
}

.card-body {
  padding: 26px;
}

.product-thumb {
  height: 210px;
  padding: 18px;
  display: grid;
  place-items: center;
  border-bottom: 1px solid var(--border);
  background: #fff;
}

.product-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card p {
  margin: 12px 0 0;
  line-height: 1.75;
}

.meta {
  margin: 0 0 10px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 900;
}

.tag-list {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 7px 11px;
  border-radius: 999px;
  background: #eef7ff;
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 800;
}

.content {
  max-width: 850px;
}

.content h2 {
  margin-top: 42px;
  font-size: 34px;
}

.content h3 {
  margin-top: 28px;
}

.content p,
.content li {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
}

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

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 48px;
  align-items: start;
}

.side-panel {
  position: sticky;
  top: 102px;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
  box-shadow: var(--shadow);
}

.side-panel p {
  margin: 12px 0 0;
}

.contact-form {
  padding: 30px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: #fff;
  box-shadow: var(--shadow);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.field {
  display: grid;
  gap: 8px;
  color: #334155;
  font-size: 14px;
  font-weight: 800;
}

.field.full {
  grid-column: 1 / -1;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 15px;
  font: inherit;
  color: var(--text);
  outline: none;
}

textarea {
  min-height: 140px;
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(15, 76, 129, .12);
}

.form-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.spec-list,
.check-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.spec-list li,
.check-list li {
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
  color: #334155;
  font-weight: 700;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.link-card {
  display: grid;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 8px 20px rgba(15, 23, 42, .04);
}

.link-card span {
  color: var(--primary);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.link-card strong {
  color: var(--dark);
  font-size: 18px;
  line-height: 1.25;
}

.breadcrumb {
  margin-bottom: 22px;
  color: #cbd5e1;
  font-size: 14px;
  font-weight: 700;
}

.breadcrumb a {
  color: #e0f2fe;
}

.faq {
  display: grid;
  gap: 14px;
}

.faq details {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #fff;
  padding: 18px 20px;
}

.faq summary {
  cursor: pointer;
  color: var(--dark);
  font-weight: 900;
}

.faq p {
  margin: 12px 0 0;
}

.cta-band {
  padding: 54px;
  border-radius: 24px;
  background: var(--dark);
  color: #fff;
}

.cta-band p {
  color: #cbd5e1;
}

.footer {
  padding: 40px 0;
  background: var(--dark);
  color: #fff;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 28px;
}

.footer p {
  margin: 0;
}

.footer .muted {
  margin-top: 8px;
  color: #94a3b8;
  font-size: 14px;
}

.copyright {
  color: #64748b;
  font-size: 14px;
  white-space: nowrap;
}

@media (max-width: 980px) {
  .nav,
  .header-cta {
    display: none;
  }

  .menu-btn {
    display: block;
  }

  .hero-inner,
  .grid-2,
  .grid-3,
  .grid-4,
  .form-grid,
  .link-grid,
  .split {
    grid-template-columns: 1fr;
  }

  .side-panel {
    position: static;
  }
}

@media (max-width: 680px) {
  .container {
    width: min(100% - 28px, 1180px);
  }

  .section {
    padding: 64px 0;
  }

  h1 {
    font-size: 40px;
  }

  .hero-inner {
    min-height: auto;
    padding: 58px 0;
  }

  .hero-actions {
    display: grid;
  }

  .hero-card,
  .cta-band {
    padding: 24px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .copyright {
    white-space: normal;
  }
}