:root {
  --paper: #f2f2f2;
  --ink: #111111;
  --muted: #686868;
  --line: #cfcfcf;
  --dark-line: #343434;
  --max: 1360px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
figure { margin: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 76px;
  display: grid;
  grid-template-columns: minmax(280px, 1fr) auto minmax(130px, auto);
  align-items: center;
  gap: 34px;
  padding: 0 max(40px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(242, 242, 242, .94);
  backdrop-filter: blur(14px);
}

.brand { font-size: 18px; font-weight: 800; letter-spacing: -.03em; }
nav { display: flex; gap: 32px; font-size: 14px; }
nav a { padding: 27px 0 24px; border-bottom: 2px solid transparent; }
nav a:hover { border-color: var(--ink); }
.header-cta { justify-self: end; border: 1px solid var(--ink); padding: 11px 18px; font-size: 14px; }

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 46%) minmax(0, 54%);
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 76px 6vw 50px max(40px, calc((100vw - var(--max)) / 2));
}

h1, h2, p { margin-top: 0; }
h1 {
  max-width: 680px;
  margin-bottom: 34px;
  font-size: clamp(50px, 4vw, 62px);
  line-height: 1.05;
  letter-spacing: -.065em;
}

.hero-copy > p:not(.disclosure) {
  max-width: 550px;
  margin-bottom: 38px;
  color: #3f3f3f;
  font-size: 19px;
  line-height: 1.8;
}

.hero-actions { display: flex; gap: 14px; }
.button { min-width: 142px; padding: 15px 22px; text-align: center; border: 1px solid var(--ink); font-weight: 700; }
.button-dark { background: var(--ink); color: white; }
.button-light { background: transparent; }
.hero-media { min-height: 680px; background: #111; overflow: hidden; }

.section {
  display: grid;
  grid-template-columns: minmax(320px, 42%) minmax(0, 58%);
  gap: 54px;
  align-items: center;
  padding: 94px max(40px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
}

.products { grid-template-columns: minmax(320px, 34%) minmax(0, 66%); }
.manufacturing { grid-template-columns: minmax(0, 58%) minmax(320px, 42%); }
.section-dark { background: var(--ink); color: var(--paper); border-color: var(--dark-line); }
.section-index { display: block; margin-bottom: 42px; font-size: 13px; font-weight: 800; letter-spacing: .16em; }
h2 { margin-bottom: 28px; font-size: clamp(42px, 4vw, 62px); line-height: 1; letter-spacing: -.055em; }
.lead { max-width: 600px; margin-bottom: 34px; font-size: 20px; line-height: 1.65; }
.fine-print { max-width: 600px; color: #8b8b8b; font-size: 14px; line-height: 1.8; }
.section-dark .fine-print { color: #a9a9a9; }

.media-frame { height: 440px; overflow: hidden; border: 1px solid var(--line); border-radius: 8px; }
.section-dark .media-frame { border-color: var(--dark-line); }
.family-frame { height: 520px; position: relative; }
.detail-frame { height: 390px; }
.fact-list { margin: 0; border-top: 1px solid var(--line); }
.fact-list div { display: grid; grid-template-columns: 138px 1fr; gap: 20px; padding: 17px 0; border-bottom: 1px solid var(--line); }
.fact-list dt { color: var(--muted); font-size: 13px; }
.fact-list dd { margin: 0; font-weight: 700; }
.fact-list-dark { border-color: var(--dark-line); }
.fact-list-dark div { border-color: var(--dark-line); }
.fact-list-dark dt { color: #9c9c9c; }

.contact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 110px;
  padding: 110px max(40px, calc((100vw - var(--max)) / 2));
}
.contact p { max-width: 600px; font-size: 18px; line-height: 1.8; color: #555; }
.contact-list { margin: 0; }
.contact-list div { display: grid; grid-template-columns: 110px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.contact-list dt { color: var(--muted); }
.contact-list dd { margin: 0; font-weight: 700; }

footer {
  min-height: 130px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 40px max(40px, calc((100vw - var(--max)) / 2));
  background: var(--ink);
  color: var(--paper);
}
footer strong { font-size: 18px; }
footer span { color: #999; font-size: 12px; letter-spacing: .08em; }

@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; padding-inline: 22px; }
  nav { display: none; }
  .hero, .section, .products, .manufacturing, .contact { grid-template-columns: 1fr; }
  .hero-copy { padding: 64px 22px; }
  .hero-media { min-height: 420px; }
  .section { padding: 72px 22px; }
  .manufacturing .media-frame { order: 2; }
  .contact { padding: 72px 22px; gap: 50px; }
  footer { align-items: flex-start; flex-direction: column; padding-inline: 22px; }
}