:root {
  --bg: #f9fbfd;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #4b5563;
  --accent: #1d4ed8;
  --accent-soft: #eff6ff;
  --border: #e5e7eb;
  --radius: 18px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
  display: block;
}
header {
  position: sticky;
  top: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 14px;
}
.site-logo img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
}
.site-logo h1 {
  font-size: 20px;
  margin: 0;
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 14px;
}
.site-nav a {
  color: var(--muted);
  padding: 10px 8px;
  border-radius: 10px;
}
.site-nav a:hover,
.site-nav a.active {
  color: var(--accent);
}
main {
  padding: 24px 0 48px;
}
.section {
  padding: 40px 0;
}
.container {
  width: min(1100px, calc(100% - 40px));
  margin: 0 auto;
}
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 40px;
  align-items: center;
}
.hero h2 {
  font-size: clamp(2.4rem, 2.5vw, 3.6rem);
  margin: 0 0 18px;
  line-height: 1.05;
}
.hero p {
  margin: 0 0 28px;
  max-width: 620px;
  color: var(--muted);
  font-size: 1.05rem;
}
.button,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
}
.button {
  background: var(--accent);
  color: #fff;
}
.button-secondary {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.card {
  background: var(--surface);
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.card h3 {
  margin-top: 0;
  margin-bottom: 12px;
}
.card p {
  margin: 0;
  color: var(--muted);
}
.section-title {
  margin: 0 0 18px;
  font-size: 2rem;
}
.section-text {
  color: var(--muted);
  max-width: 780px;
}
.features {
  display: grid;
  gap: 24px;
}
.features img {
  border-radius: var(--radius);
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}
.spec-table th,
.spec-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.spec-table th {
  background: var(--accent-soft);
  color: var(--accent);
}
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
}
.contact-card {
  background: var(--surface);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.contact-card h3 {
  margin-top: 0;
}
footer {
  background: #fff;
  border-top: 1px solid var(--border);
  padding: 24px 0;
}
footer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}
@media (max-width: 840px) {
  .hero {
    grid-template-columns: 1fr;
  }
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .site-nav {
    width: 100%;
  }
  .contact-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }
}