:root {
  --canvas: #f3f0e8;
  --surface: #fbfaf6;
  --ink: #142326;
  --muted: #596668;
  --line: #d8d5cc;
  --brand: #1f625d;
  --brand-dark: #174d49;
  --accent: #bd9557;
  --white: #ffffff;
  --container: 68rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 20rem;
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-underline-offset: 0.22em;
  text-decoration-thickness: 0.08em;
}

a:hover {
  text-decoration-thickness: 0.12em;
}

a:focus-visible {
  outline: 0.1875rem solid var(--accent);
  outline-offset: 0.25rem;
}

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

h1,
h2 {
  line-height: 1.16;
  letter-spacing: -0.035em;
}

.container {
  width: min(calc(100% - 3rem), var(--container));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.6rem 0.9rem;
  color: var(--white);
  background: var(--brand-dark);
  border-radius: 0.6rem;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid rgba(20, 35, 38, 0.12);
  background: rgba(243, 240, 232, 0.96);
}

.header-inner {
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: var(--white);
  background: var(--brand);
  border-radius: 50% 50% 50% 0.4rem;
  font-size: 0.9rem;
}

.brand-name {
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
  color: var(--muted);
  font-size: 0.92rem;
}

.site-nav a {
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--brand-dark);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(5.5rem, 12vw, 9rem) 0;
}

.hero::before {
  position: absolute;
  width: 32rem;
  height: 32rem;
  top: -18rem;
  right: -10rem;
  content: "";
  pointer-events: none;
  border: 1px solid rgba(31, 98, 93, 0.18);
  border-radius: 50%;
  box-shadow:
    0 0 0 4.5rem rgba(31, 98, 93, 0.03),
    0 0 0 9rem rgba(31, 98, 93, 0.02);
}

.hero-inner {
  position: relative;
}

.hero-copy {
  max-width: 53rem;
}

.eyebrow {
  margin-bottom: 1rem;
  color: var(--brand-dark);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.18em;
}

.hero h1 {
  max-width: 9em;
  margin-bottom: 1.5rem;
  font-size: clamp(3rem, 7.5vw, 6rem);
  font-weight: 760;
  letter-spacing: -0.06em;
}

.hero-lead {
  max-width: 46rem;
  margin-bottom: 0.65rem;
  color: #334245;
  font-size: clamp(1.08rem, 1.8vw, 1.3rem);
}

.hero-note {
  max-width: 46rem;
  margin-bottom: 2.1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.button {
  min-height: 3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1.25rem;
  color: var(--white);
  background: var(--brand);
  border-radius: 999px;
  box-shadow: 0 0.5rem 1.4rem rgba(31, 98, 93, 0.18);
  font-size: 0.94rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  transition:
    background-color 160ms ease,
    transform 160ms ease;
}

.button:hover {
  background: var(--brand-dark);
  transform: translateY(-0.125rem);
}

.section {
  padding: clamp(4.5rem, 9vw, 7rem) 0;
  background: var(--surface);
}

.brief-grid,
.operator-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(22rem, 1.22fr);
  align-items: start;
  gap: clamp(3rem, 9vw, 8rem);
}

.section-heading {
  margin-bottom: 0;
}

.section-heading h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4.2vw, 3.4rem);
}

.brief-copy {
  padding-top: 1.85rem;
  border-top: 1px solid var(--line);
}

.brief-copy p {
  margin-bottom: 0.7rem;
  color: #334245;
  font-size: 1.08rem;
}

.brief-copy .brief-note {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.section-muted {
  color: var(--white);
  background: var(--ink);
}

.section-muted .eyebrow {
  color: #a9d0ca;
}

.operator-list {
  margin-bottom: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.operator-list div {
  display: grid;
  grid-template-columns: minmax(6.5rem, 0.35fr) minmax(0, 1fr);
  gap: 1.5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.operator-list dt {
  color: #9facac;
  font-size: 0.78rem;
}

.operator-list dd {
  margin-bottom: 0;
  color: var(--white);
  font-weight: 620;
  overflow-wrap: anywhere;
}

.operator-list a {
  color: #c8e4df;
}

.site-footer {
  padding: 1.4rem 0;
  color: #c4cccc;
  background: #0d1719;
  font-size: 0.82rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-inner p {
  margin-bottom: 0;
}

.footer-inner a {
  flex: 0 0 auto;
  color: #d6e6e3;
}

.error-page {
  min-height: calc(100vh - 10rem);
  display: grid;
  place-items: center;
  padding: 4rem 0;
}

.error-inner {
  max-width: 42rem;
  text-align: center;
}

.error-code {
  margin-bottom: -1.5rem;
  color: rgba(31, 98, 93, 0.09);
  font-size: clamp(8rem, 25vw, 14rem);
  font-weight: 800;
  line-height: 0.85;
  letter-spacing: -0.08em;
}

.error-inner h1 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 5vw, 3.4rem);
}

.error-inner > p:not(.eyebrow, .error-code) {
  max-width: 34rem;
  margin: 0 auto 2rem;
  color: var(--muted);
}

@media (max-width: 48rem) {
  .brief-grid,
  .operator-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 38rem) {
  .container {
    width: min(calc(100% - 2rem), var(--container));
  }

  .header-inner {
    min-height: 4.5rem;
    gap: 0.5rem;
  }

  .brand {
    gap: 0.55rem;
  }

  .brand-name {
    max-width: 7.8rem;
    line-height: 1.2;
  }

  .site-nav {
    gap: 0.8rem;
    font-size: 0.8rem;
  }

  .hero {
    padding: 4.75rem 0;
  }

  .hero h1 {
    max-width: 7em;
  }

  .button {
    width: 100%;
  }

  .operator-list div {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.5rem;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-nav,
  .button,
  .skip-link {
    display: none;
  }

  body,
  .section,
  .section-muted,
  .site-footer {
    color: #000;
    background: #fff;
  }

  .section-muted .section-heading,
  .operator-list dd,
  .operator-list a,
  .site-footer,
  .site-footer a {
    color: #000;
  }
}