:root {
  --deep: #0F1B28;
  --ink: #1C2733;
  --steel: #2E4257;
  --steel-light: #7E93A8;
  --copper: #B4633A;
  --copper-bright: #D08A57;
  --paper: #F2F5F7;
  --line: #D5DDE4;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
}

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

:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 2px;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 24px;
  max-width: 1040px;
  margin: 0 auto;
  padding: 20px 32px;
}

.brand {
  font-size: 15px;
  font-weight: 600;
  color: var(--steel);
  letter-spacing: 0.04em;
}

.site-nav a {
  margin-left: 24px;
  font-size: 15px;
  color: var(--ink);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.site-nav a:hover {
  color: var(--copper);
  border-bottom-color: var(--copper);
}

.hero {
  background:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px) 0 0 / 100% 48px,
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px) 0 0 / 48px 100%,
    var(--deep);
  color: #EAF0F5;
  display: grid;
  grid-template-columns: 5fr 6fr;
  align-items: center;
  gap: 32px;
  padding: 88px max(32px, calc((100% - 976px) / 2));
}

.hero h1 {
  font-size: clamp(2rem, 4.6vw, 3.2rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.3;
}

.hero-sub {
  margin-top: 20px;
  max-width: 30em;
  font-size: 16px;
  color: #B9C6D2;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.btn {
  display: inline-block;
  background: var(--copper);
  color: #FFF;
  font-size: 15px;
  padding: 10px 28px;
  border-radius: 4px;
}

.btn:hover {
  background: #9C5330;
}

.quiet-link {
  font-size: 15px;
  color: #B9C6D2;
  border-bottom: 1px solid rgba(185, 198, 210, 0.4);
  padding-bottom: 2px;
}

.quiet-link:hover {
  color: var(--copper-bright);
  border-bottom-color: var(--copper-bright);
}

.hero-figure {
  padding-right: max(32px, calc((100% - 976px) / 2));
}

.hero-figure svg {
  width: 100%;
  height: auto;
  display: block;
}

.hero-draw {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: hero-draw 1s ease forwards;
}

@keyframes hero-draw {
  to {
    stroke-dashoffset: 0;
  }
}

main {
  display: block;
}

main > section:not(.hero) {
  max-width: 1040px;
  margin: 0 auto;
  padding: 64px 32px;
  display: grid;
  grid-template-columns: 176px 1fr;
  gap: 40px;
}

main > section:not(.hero) + section:not(.hero) {
  border-top: 1px solid var(--line);
}

main h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--steel);
  line-height: 1.5;
}

.section-body {
  max-width: 42em;
}

.section-body > p + .spec,
.section-body > p + p {
  margin-top: 16px;
}

.spec {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.spec tr + tr {
  border-top: 1px solid var(--line);
}

.spec th {
  text-align: left;
  vertical-align: top;
  font-weight: 500;
  color: var(--steel);
  width: 7em;
  padding: 14px 24px 14px 0;
  white-space: nowrap;
}

.spec td {
  vertical-align: top;
  padding: 14px 0;
}

.spec a {
  color: var(--copper);
  border-bottom: 1px solid rgba(180, 99, 58, 0.35);
}

.spec a:hover {
  border-bottom-color: var(--copper);
}

.site-footer {
  background: var(--deep);
  color: #B9C6D2;
  font-size: 13.5px;
}

.site-footer-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 28px 32px;
}

.site-footer a {
  color: #B9C6D2;
  border-bottom: 1px solid rgba(185, 198, 210, 0.35);
}

.site-footer a:hover {
  color: var(--copper-bright);
  border-bottom-color: var(--copper-bright);
}

.site-footer p + p {
  margin-top: 4px;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 64px 24px;
  }

  .hero-figure {
    max-width: 480px;
  }

  main > section:not(.hero) {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 48px 24px;
  }

  .site-header {
    padding: 16px 24px;
  }

  .site-nav a {
    margin-left: 16px;
  }

  .site-footer-inner {
    padding: 24px;
  }
}

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

  .hero-draw {
    animation: none;
    stroke-dashoffset: 0;
  }
}