:root {
  --ink: #171c24;
  --muted: #5f6875;
  --paper: #f4f2ec;
  --white: #ffffff;
  --line: #d9d8d2;
  --lime: #b9ef65;
  --coral: #ff7866;
  --blue: #3568d4;
  --shadow: 0 14px 40px rgba(23, 28, 36, 0.10);
  --content: min(1180px, calc(100vw - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; }

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  color: var(--white);
  background: rgba(18, 23, 31, 0.82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 760; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--lime);
  color: var(--ink);
  font-size: 12px;
  border-radius: 4px;
}
nav { display: flex; gap: 28px; font-size: 14px; }
nav a { color: rgba(255,255,255,0.78); }
nav a:hover, nav a:focus-visible { color: var(--white); }

.hero {
  position: relative;
  min-height: min(760px, 92vh);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: var(--white);
  background: #222936 url("./assets/vibro-radar.jpeg") center / cover no-repeat;
}
.hero-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 19, 27, 0.76);
}
.hero-inner {
  position: relative;
  z-index: 1;
  width: var(--content);
  margin: 0 auto;
  padding: 150px 0 108px;
}
.eyebrow {
  margin: 0 0 16px;
  color: var(--blue);
  font-size: 12px;
  line-height: 1.4;
  font-weight: 800;
  text-transform: uppercase;
}
.hero .eyebrow { color: var(--lime); }
h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: 800px;
  margin-bottom: 22px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(58px, 9vw, 126px);
  line-height: 0.9;
  font-weight: 500;
}
.hero-copy {
  max-width: 680px;
  margin-bottom: 34px;
  font-size: 23px;
  line-height: 1.55;
  color: rgba(255,255,255,0.88);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 760;
  transition: transform 160ms ease, background 160ms ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--lime); color: var(--ink); }
.button-secondary { border: 1px solid rgba(255,255,255,0.45); color: var(--white); }
.button-secondary:hover { background: rgba(255,255,255,0.12); }
.hero-next {
  position: absolute;
  z-index: 1;
  right: max(24px, calc((100vw - 1180px) / 2));
  bottom: 28px;
  color: rgba(255,255,255,0.68);
  font-size: 12px;
}

section:not(.hero) { width: var(--content); margin: 0 auto; }
.intro-band { padding: 108px 0 88px; }
.section-heading { max-width: 760px; }
.section-heading h2, .closing-section h2 {
  margin-bottom: 20px;
  font-family: Georgia, "Times New Roman", "Songti SC", serif;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.08;
  font-weight: 500;
}
.section-heading > p:last-child { color: var(--muted); font-size: 17px; line-height: 1.7; }
.intro-copy {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  margin: 48px 0 58px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}
.intro-copy p { margin: 0; color: #424a55; font-size: 17px; line-height: 1.85; }
.focus-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.focus-row div { padding: 28px 24px 28px 0; }
.focus-row div + div { padding-left: 28px; border-left: 1px solid var(--line); }
.focus-row strong, .focus-row span { display: block; }
.focus-row strong { margin-bottom: 8px; font-size: 20px; }
.focus-row span { color: var(--muted); font-size: 14px; line-height: 1.6; }

.products-section { padding: 96px 0 110px; }
.product-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 48px; }
.product-card {
  overflow: hidden;
  background: var(--white);
  border: 1px solid #e1e1dd;
  border-radius: 8px;
  box-shadow: 0 8px 28px rgba(23,28,36,0.05);
}
.product-media { height: 330px; overflow: hidden; background: #eef0f4; border-bottom: 1px solid #e5e6e8; }
.product-media img { height: 100%; object-fit: cover; object-position: top left; }
.product-media-tall img { object-position: top center; }
.product-body { padding: 30px; }
.product-meta { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 18px; color: var(--muted); font-size: 12px; }
.product-meta span:first-child { color: var(--blue); font-weight: 760; }
.product-body h3 { margin-bottom: 14px; font-size: 27px; line-height: 1.25; }
.product-body p { color: var(--muted); font-size: 15px; line-height: 1.75; }
.product-body ul { margin: 22px 0 0; padding: 20px 0 0; list-style: none; border-top: 1px solid #e5e5e1; }
.product-body li { position: relative; margin: 9px 0; padding-left: 18px; color: #3f4751; font-size: 14px; line-height: 1.55; }
.product-body li::before { content: ""; position: absolute; left: 0; top: 8px; width: 7px; height: 7px; border-radius: 50%; background: var(--coral); }

.method-section { padding: 104px 0; border-top: 1px solid var(--line); }
.method-list { margin: 50px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.method-list li { display: grid; grid-template-columns: 80px 1fr; gap: 24px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.method-list > li > span { color: var(--coral); font-family: Georgia, serif; font-size: 20px; }
.method-list h3 { margin-bottom: 8px; font-size: 22px; }
.method-list p { margin: 0; color: var(--muted); line-height: 1.7; }

.closing-section { padding: 110px 0 120px; border-top: 1px solid var(--line); }
.closing-section h2 { max-width: 920px; }
.closing-section > p:last-child { color: var(--muted); font-size: 16px; }
footer {
  width: var(--content);
  margin: 0 auto;
  padding: 30px 0 40px;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

:focus-visible { outline: 3px solid var(--lime); outline-offset: 3px; }

@media (max-width: 760px) {
  :root { --content: calc(100vw - 32px); }
  .site-header { height: 60px; padding: 0 16px; }
  .brand > span:last-child { display: none; }
  nav { gap: 18px; font-size: 13px; }
  .hero { min-height: 690px; }
  .hero-inner { padding: 130px 0 92px; }
  h1 { font-size: clamp(52px, 18vw, 78px); line-height: 0.95; overflow-wrap: anywhere; }
  .hero-copy { max-width: 520px; font-size: 18px; }
  .hero-next { display: none; }
  .intro-band, .products-section, .method-section, .closing-section { padding-top: 76px; padding-bottom: 76px; }
  .section-heading h2, .closing-section h2 { font-size: 38px; }
  .intro-copy, .product-grid { grid-template-columns: 1fr; gap: 26px; }
  .focus-row { grid-template-columns: 1fr; }
  .focus-row div { padding: 22px 0; }
  .focus-row div + div { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .product-media { height: 230px; }
  .product-body { padding: 24px; }
  .method-list li { grid-template-columns: 48px 1fr; gap: 12px; }
  footer { flex-direction: column; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}