:root {
  color-scheme: light;
  --ink: #0b0b0b;
  --paper: #ffffff;
  --soft: #f3f3f1;
  --muted: #666663;
  --line: #d9d9d5;
  --signal: #d72638;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

a {
  color: inherit;
}

.site-header,
main,
footer {
  width: min(1440px, calc(100% - 80px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  min-height: 92px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

.wordmark span {
  color: var(--signal);
}

nav {
  display: flex;
  gap: 36px;
}

nav a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

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

.hero {
  display: grid;
  min-height: calc(100svh - 150px);
  grid-template-columns: minmax(360px, 0.85fr) minmax(520px, 1.15fr);
  align-items: center;
  gap: clamp(48px, 7vw, 120px);
  padding: 68px 0 84px;
}

.kicker,
.section-label,
.hero-visual p,
footer {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 34px;
  color: var(--muted);
}

.kicker span {
  width: 26px;
  height: 2px;
  background: var(--signal);
}

h1 {
  margin: 0;
  font-size: clamp(74px, 8.5vw, 138px);
  font-weight: 300;
  line-height: 0.78;
}

h1 strong {
  margin-left: clamp(54px, 7vw, 110px);
  font-weight: 800;
}

.lead {
  margin: 52px 0 10px;
  font-size: 24px;
  font-weight: 600;
}

.sublead {
  max-width: 500px;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.primary-link {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  margin-top: 42px;
  border-bottom: 2px solid var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.primary-link:hover {
  border-color: var(--signal);
  color: var(--signal);
}

.hero-visual {
  position: relative;
  display: flex;
  min-height: 580px;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--soft);
}

.hero-visual::before {
  position: absolute;
  inset: 18px;
  border: 1px solid #dfdfdc;
  content: "";
  pointer-events: none;
}

.hero-visual img {
  display: block;
  width: min(86%, 760px);
  height: auto;
  mix-blend-mode: multiply;
}

.hero-visual p {
  position: absolute;
  right: 28px;
  bottom: 24px;
  margin: 0;
  color: var(--muted);
}

.about {
  display: grid;
  grid-template-columns: 180px 1fr auto;
  gap: 36px;
  align-items: start;
  padding: 100px 0 118px;
  border-top: 1px solid var(--line);
}

.section-label {
  margin: 10px 0 0;
  color: var(--signal);
}

.about h2 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(42px, 6vw, 86px);
  font-weight: 400;
  line-height: 1;
}

.about-copy p {
  max-width: 560px;
  margin: 34px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.75;
}

.arrow-link {
  display: grid;
  width: 64px;
  height: 64px;
  place-items: center;
  border: 1px solid var(--ink);
  font-size: 24px;
  text-decoration: none;
}

.arrow-link:hover {
  border-color: var(--signal);
  color: var(--signal);
}

footer {
  display: flex;
  min-height: 88px;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

footer p {
  margin: 0;
}

footer p:last-child {
  display: flex;
  align-items: center;
  gap: 12px;
}

footer p:last-child span {
  width: 4px;
  height: 4px;
  background: var(--signal);
}

@media (max-width: 900px) {
  .site-header,
  main,
  footer {
    width: min(100% - 36px, 1440px);
  }

  .site-header {
    min-height: 76px;
  }

  nav {
    gap: 20px;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 56px 0 72px;
  }

  h1 {
    font-size: 84px;
  }

  .lead {
    margin-top: 40px;
    font-size: 21px;
  }

  .hero-visual {
    min-height: 360px;
  }

  .about {
    grid-template-columns: 1fr auto;
    gap: 28px;
    padding: 72px 0 84px;
  }

  .section-label {
    grid-column: 1 / -1;
  }
}

@media (max-width: 520px) {
  .site-header {
    min-height: 64px;
  }

  nav a:first-child {
    display: none;
  }

  .hero {
    gap: 26px;
    padding: 32px 0 38px;
  }

  .kicker {
    margin-bottom: 22px;
  }

  h1 {
    font-size: 64px;
  }

  .lead {
    margin-top: 28px;
    font-size: 19px;
  }

  .sublead {
    font-size: 14px;
    line-height: 1.6;
  }

  .primary-link {
    margin-top: 24px;
  }

  .hero-visual {
    min-height: 190px;
  }

  .hero-visual::before {
    inset: 10px;
  }

  .hero-visual p {
    right: 16px;
    bottom: 14px;
    font-size: 9px;
  }

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

  .about h2 {
    font-size: 46px;
  }

  .arrow-link {
    width: 56px;
    height: 56px;
  }

  footer {
    min-height: 112px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 10px;
  }
}