:root {
  color-scheme: light;
  --ink: #1f2937;
  --ink-soft: #4b5563;
  --paper: #f6f7f9;
  --white: #ffffff;
  --line: #d7dce2;
  --teal: #18b8a5;
  --coral: #fb7185;
  --header-height: 68px;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.7;
}

a {
  color: inherit;
}

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 3;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

nav {
  display: flex;
  gap: 24px;
}

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

nav a:hover,
nav a:focus-visible,
.text-link:hover,
.text-link:focus-visible,
footer a:hover,
footer a:focus-visible {
  color: #087f73;
}

.hero {
  position: relative;
  min-height: min(82vh, 760px);
  overflow: hidden;
  display: grid;
  align-items: center;
  padding: calc(var(--header-height) + 32px) max(28px, calc((100vw - 1124px) / 2)) 72px;
  border-bottom: 1px solid var(--line);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(640px, 68%);
}

.hero-mark {
  position: absolute;
  right: max(34px, calc((100vw - 1124px) / 2));
  top: 50%;
  width: 330px;
  height: 330px;
  transform: translateY(-44%);
  background: url("/icon.png") center / contain no-repeat;
  filter: drop-shadow(0 22px 28px rgb(31 41 55 / 18%));
}

.status {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 20px;
  color: var(--ink-soft);
  font-size: 14px;
}

.status span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--coral);
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: 72px;
  line-height: 1.05;
}

.hero-copy {
  max-width: 590px;
  margin: 26px 0 28px;
  color: var(--ink-soft);
  font-size: 20px;
  line-height: 1.75;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 650;
  text-decoration: none;
}

.scope-band,
.principles {
  padding: 86px 28px;
}

.scope-band {
  background: var(--white);
}

.section-inner {
  max-width: 1124px;
  margin: 0 auto;
}

.section-heading > p,
.document-kicker {
  margin: 0 0 8px;
  color: #087f73;
  font-size: 13px;
  font-weight: 700;
}

.section-heading h2 {
  max-width: 570px;
  margin: 0;
  font-size: 36px;
  line-height: 1.25;
}

.scope-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  margin-top: 54px;
}

.scope-grid article {
  min-height: 220px;
  padding: 24px 4px 0;
  border-top: 2px solid var(--ink);
}

.scope-grid .index {
  color: var(--coral);
  font-size: 13px;
  font-weight: 700;
}

.scope-grid h3 {
  margin: 34px 0 10px;
  font-size: 20px;
}

.scope-grid p,
.principle-list p,
.document-page p {
  color: var(--ink-soft);
}

.principles {
  border-bottom: 1px solid var(--line);
}

.principles-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 84px;
}

.principle-list {
  border-top: 1px solid var(--line);
}

.principle-list p {
  margin: 0;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

footer {
  max-width: 1180px;
  min-height: 112px;
  margin: 0 auto;
  padding: 26px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--ink-soft);
  font-size: 14px;
}

footer div {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

footer strong {
  color: var(--ink);
  font-size: 16px;
}

footer a {
  text-decoration: none;
}

.document-page {
  min-height: calc(100vh - 112px);
  padding: calc(var(--header-height) + 70px) 28px 92px;
}

.document-page article {
  max-width: 760px;
  margin: 0 auto;
}

.document-page h1 {
  margin-bottom: 38px;
  font-size: 48px;
}

.document-page h2 {
  margin: 42px 0 10px;
  font-size: 22px;
}

.document-page p {
  margin: 0 0 18px;
}

@media (max-width: 860px) {
  .site-header {
    padding: 0 20px;
  }

  nav {
    gap: 16px;
  }

  .hero {
    min-height: 760px;
    align-items: end;
    padding: calc(var(--header-height) + 240px) 22px 62px;
  }

  .hero-content {
    width: 100%;
  }

  .hero-mark {
    right: 50%;
    top: 102px;
    width: 220px;
    height: 220px;
    transform: translateX(50%);
  }

  h1 {
    font-size: 54px;
  }

  .hero-copy {
    font-size: 18px;
  }

  .scope-band,
  .principles {
    padding: 68px 22px;
  }

  .scope-grid,
  .principles-layout {
    grid-template-columns: 1fr;
  }

  .scope-grid {
    gap: 18px;
  }

  .scope-grid article {
    min-height: 180px;
  }

  .principles-layout {
    gap: 42px;
  }

  footer {
    padding: 24px 22px;
  }
}

@media (max-width: 520px) {
  .brand span {
    display: none;
  }

  h1 {
    font-size: 46px;
  }

  .section-heading h2 {
    font-size: 30px;
  }

  footer,
  footer div {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}