:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --ink: #101620;
  --muted: #5f6d7e;
  --line: #dfe6ee;
  --accent: #13b8a6;
  --accent-dark: #0f766e;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(223, 230, 238, 0.9);
  background: rgba(247, 249, 252, 0.92);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
}

.brand-logo {
  display: block;
  width: clamp(160px, 20vw, 250px);
  height: auto;
  object-fit: contain;
}

nav {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.nav-button,
.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  font-weight: 900;
}

.nav-button,
.primary-button {
  background: var(--ink);
  color: #ffffff;
}

.secondary-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  align-items: center;
  gap: clamp(28px, 5vw, 70px);
  min-height: calc(100vh - 75px);
  padding: clamp(56px, 8vw, 104px) clamp(20px, 5vw, 72px);
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(42px, 6.6vw, 82px);
  line-height: 1.03;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 610px;
  font-size: clamp(18px, 2vw, 21px);
}

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

.brand-card {
  display: grid;
  place-items: center;
  min-height: 420px;
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 24px 70px rgba(16, 22, 32, 0.08);
}

.brand-card img {
  display: block;
  width: 100%;
  max-width: 520px;
  object-fit: contain;
}

.section {
  padding: clamp(54px, 7vw, 88px) clamp(20px, 5vw, 72px);
}

.section-title {
  max-width: 720px;
  margin-bottom: 28px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card-grid article {
  min-height: 180px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.product,
.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.product > div,
.contact > div {
  max-width: 680px;
}

.email-link {
  color: var(--accent-dark);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 900;
}

.email-link.small {
  font-size: inherit;
}

.legal-page .section {
  max-width: 900px;
}

.legal-page h1 {
  font-size: clamp(42px, 6vw, 68px);
}

.legal-page h2 {
  margin-top: 36px;
  font-size: clamp(24px, 3vw, 32px);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer span:last-child {
  display: inline-flex;
  gap: 18px;
}

footer a {
  color: var(--ink);
  font-weight: 800;
}

@media (max-width: 860px) {
  .site-header,
  .product,
  .contact,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    flex-wrap: wrap;
    gap: 14px;
  }

  .brand-logo {
    width: 176px;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .brand-card {
    min-height: 300px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}