:root {
  --ink: #10263b;
  --muted: #5d7185;
  --line: #cbd6e1;
  --line-soft: #e7edf3;
  --blue: #155eef;
  --orange: #f05a28;
  --teal: #247b7a;
  --white: #ffffff;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --serif: "Songti SC", "STSong", "SimSun", Georgia, serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --page: min(1320px, calc(100vw - 64px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 99;
  padding: 10px 14px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  width: var(--page);
  min-height: 104px;
  margin: 0 auto;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.brand { display: inline-flex; align-items: center; gap: 15px; }
.brand-mark {
  width: 31px;
  height: 31px;
  padding: 7px;
  background: var(--ink);
  display: grid;
  place-items: center;
}
.brand-mark span { width: 100%; height: 100%; background: var(--orange); display: block; }
.brand-copy { display: grid; gap: 3px; }
.brand-copy strong { font-size: 19px; letter-spacing: .03em; }
.brand-copy small { font: 11px/1.2 var(--mono); letter-spacing: .08em; color: var(--muted); }
.site-header nav { display: flex; align-items: center; gap: 34px; font-size: 14px; font-weight: 650; }
.site-header nav a { padding: 12px 0; border-bottom: 2px solid transparent; }
.site-header nav a:hover { border-color: var(--blue); }
.site-header .nav-cta { padding: 12px 18px; border: 1px solid var(--ink); }
.site-header .nav-cta:hover { color: var(--white); background: var(--ink); border-color: var(--ink); }

main { overflow: hidden; }
.hero {
  width: var(--page);
  min-height: 690px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(430px, .92fr);
  gap: 66px;
  align-items: center;
}
.field-line,
.section-heading > p:first-child,
.method-intro > p,
.map-head,
.map-field > p,
.map-foot,
.guide-type,
.guide-meta,
.guide-index small,
.method li > span {
  margin: 0;
  color: var(--blue);
  font: 700 11px/1.4 var(--mono);
  letter-spacing: .13em;
  text-transform: uppercase;
}
.hero h1 {
  max-width: 720px;
  margin: 34px 0 20px;
  font: 700 clamp(52px, 5vw, 82px)/1.13 var(--serif);
  letter-spacing: -.055em;
}
.rule-mark { width: 96px; height: 5px; background: var(--orange); }
.hero-lede {
  max-width: 660px;
  margin: 28px 0 0;
  color: #445f76;
  font-size: 18px;
  line-height: 1.85;
}
.hero-actions { display: flex; gap: 16px; margin-top: 38px; }
.button {
  min-height: 54px;
  padding: 0 24px;
  border: 1px solid var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 750;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--white); background: var(--ink); }
.button-primary:hover { background: var(--blue); border-color: var(--blue); }
.button-secondary:hover { color: var(--white); background: var(--ink); }
.hero-facts {
  margin: 42px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 18px 36px;
}
.hero-facts div { display: grid; gap: 5px; }
.hero-facts dt { font: 700 11px/1.2 var(--mono); letter-spacing: .12em; }
.hero-facts dd { margin: 0; color: var(--muted); font-size: 12px; }

.hero-map {
  min-height: 510px;
  border-top: 3px solid var(--ink);
  border-bottom: 1px solid var(--line);
  background-image: linear-gradient(var(--line-soft) 1px, transparent 1px), linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 44px 44px;
  display: flex;
  flex-direction: column;
}
.map-head { min-height: 62px; padding: 18px 0; display: flex; justify-content: space-between; border-bottom: 1px solid var(--line); }
.map-head span:last-child { color: var(--muted); letter-spacing: .06em; }
.map-sequence { min-height: 115px; display: flex; align-items: center; justify-content: center; gap: 0; }
.map-sequence span {
  width: 78px;
  height: 54px;
  border: 1px solid var(--ink);
  background: var(--white);
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 700;
}
.map-sequence i { width: 28px; height: 2px; background: var(--blue); position: relative; }
.map-sequence i::after { content: ""; position: absolute; right: -1px; top: -3px; border-left: 6px solid var(--blue); border-top: 4px solid transparent; border-bottom: 4px solid transparent; }
.map-field {
  margin: 0 0 0;
  padding: 22px 24px;
  border: 1px dashed #b6c6d6;
  background: rgba(255, 255, 255, .94);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}
.map-field > p { grid-column: 1 / -1; margin-bottom: 12px; color: var(--muted); }
.map-field a {
  min-height: 75px;
  padding: 13px 14px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 28px 1fr;
  grid-template-rows: auto auto;
  column-gap: 7px;
  transition: color .2s ease, background .2s ease;
}
.map-field a:nth-of-type(odd) { border-right: 1px solid var(--line); }
.map-field a:hover { color: var(--white); background: var(--ink); }
.map-field b { grid-row: 1 / 3; color: var(--blue); font: 700 11px/1.4 var(--mono); }
.map-field span { font-size: 15px; font-weight: 750; }
.map-field em { color: var(--muted); font: normal 11px/1.4 var(--mono); }
.map-field a:hover em { color: #b9c8d6; }
.map-foot { min-height: 57px; margin-top: auto; padding: 18px 4px; border-top: 1px solid var(--line); display: flex; gap: 28px; color: var(--teal); }
.map-foot span:first-child { color: var(--ink); }

.guide-section { border-top: 3px solid var(--ink); }
.section-heading {
  width: var(--page);
  margin: 0 auto;
  padding: 66px 0 42px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr);
  column-gap: 70px;
}
.section-heading > p:first-child { grid-column: 1 / -1; margin-bottom: 24px; color: var(--muted); }
.section-heading h2,
.method-intro h2 {
  margin: 0;
  font: 700 clamp(36px, 4vw, 58px)/1.2 var(--serif);
  letter-spacing: -.04em;
}
.section-heading > p:last-child { align-self: end; margin: 0; color: var(--muted); font-size: 15px; line-height: 1.8; }
.guide-list { border-top: 1px solid var(--line); }
.guide {
  width: var(--page);
  min-height: 205px;
  margin: 0 auto;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 120px minmax(360px, 1fr) 190px 140px;
  gap: 34px;
  align-items: center;
  position: relative;
}
.guide::before { content: ""; position: absolute; left: 0; top: 34px; bottom: 34px; width: 4px; background: var(--guide-accent); }
.guide-blue { --guide-accent: var(--blue); }
.guide-orange { --guide-accent: var(--orange); }
.guide-teal { --guide-accent: var(--teal); }
.guide-navy { --guide-accent: var(--ink); }
.guide-index { align-self: stretch; padding-left: 22px; display: flex; flex-direction: column; justify-content: space-between; }
.guide-index span { color: var(--guide-accent); font: 700 28px/1 var(--mono); }
.guide-index small { color: var(--muted); line-height: 1.65; }
.guide-main h3 { margin: 9px 0 11px; font: 700 27px/1.35 var(--serif); letter-spacing: -.02em; }
.guide-main > p:last-child { max-width: 720px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.guide-type { color: var(--guide-accent); }
.guide-meta { display: grid; gap: 10px; color: var(--muted); letter-spacing: .05em; }
.guide-meta span { padding-bottom: 9px; border-bottom: 1px solid var(--line-soft); }
.guide-link { min-height: 46px; border-bottom: 2px solid var(--ink); display: flex; align-items: center; justify-content: space-between; font-size: 14px; font-weight: 750; }
.guide-link span { color: var(--guide-accent); font-size: 22px; transition: transform .2s ease; }
.guide-link:hover span { transform: translateX(5px); }

.method { margin-top: 100px; background: var(--ink); color: var(--white); }
.method-intro,
.method ol { width: var(--page); margin-left: auto; margin-right: auto; }
.method-intro { padding: 76px 0 48px; }
.method-intro > p { margin-bottom: 20px; color: #8fb0ff; }
.method ol { margin-top: 0; margin-bottom: 0; padding: 0 0 90px; list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); }
.method li { min-height: 220px; padding: 30px 38px; border-top: 1px solid #607184; border-right: 1px solid #607184; }
.method li:first-child { padding-left: 0; }
.method li:last-child { border-right: 0; }
.method li > span { color: #8fb0ff; }
.method h3 { margin: 25px 0 14px; font: 700 23px/1.35 var(--serif); }
.method li p { margin: 0; color: #c8d3de; font-size: 14px; line-height: 1.8; }

.site-footer {
  width: var(--page);
  min-height: 120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.site-footer div { display: flex; align-items: baseline; gap: 18px; }
.site-footer strong { font-size: 17px; }
.site-footer span { color: var(--muted); font-size: 13px; }
.site-footer a { font: 700 11px/1.2 var(--mono); letter-spacing: .08em; }

@media (max-width: 1080px) {
  :root { --page: min(100% - 44px, 960px); }
  .site-header nav { gap: 22px; }
  .hero { min-height: auto; padding: 70px 0; grid-template-columns: 1fr; gap: 56px; }
  .hero-copy { max-width: 760px; }
  .hero-map { min-height: 470px; }
  .guide { grid-template-columns: 92px minmax(0, 1fr) 150px; }
  .guide-link { grid-column: 2 / 4; width: 180px; justify-self: end; }
}

@media (max-width: 720px) {
  :root { --page: calc(100% - 32px); }
  .site-header { min-height: 82px; }
  .brand-copy small { display: none; }
  .site-header nav a:not(.nav-cta) { display: none; }
  .site-header .nav-cta { padding: 10px 13px; font-size: 13px; }
  .hero { padding: 58px 0 64px; gap: 48px; }
  .hero h1 { margin-top: 25px; font-size: clamp(43px, 13vw, 64px); line-height: 1.12; }
  .hero-lede { font-size: 16px; line-height: 1.75; }
  .hero-actions { flex-direction: column; }
  .button { width: 100%; }
  .hero-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  .hero-map { min-height: 0; }
  .map-head span:last-child { display: none; }
  .map-sequence { min-height: 92px; }
  .map-sequence span { width: 62px; height: 48px; font-size: 12px; }
  .map-sequence i { width: 13px; }
  .map-field { grid-template-columns: 1fr; padding: 18px; }
  .map-field a:nth-of-type(odd) { border-right: 0; }
  .map-foot { gap: 14px; font-size: 9px; }
  .section-heading { padding: 52px 0 34px; grid-template-columns: 1fr; gap: 22px; }
  .section-heading > p:first-child { margin-bottom: 4px; }
  .section-heading > p:last-child { max-width: 600px; }
  .guide { padding: 28px 0; grid-template-columns: 70px minmax(0, 1fr); gap: 18px; }
  .guide::before { top: 28px; bottom: 28px; }
  .guide-index { padding-left: 15px; }
  .guide-index small { font-size: 8px; }
  .guide-main h3 { font-size: 22px; }
  .guide-meta { grid-column: 2; display: flex; flex-wrap: wrap; gap: 8px 14px; }
  .guide-meta span { padding-bottom: 5px; }
  .guide-link { grid-column: 2; width: 100%; }
  .method { margin-top: 72px; }
  .method-intro { padding: 58px 0 38px; }
  .method ol { padding-bottom: 60px; grid-template-columns: 1fr; }
  .method li,
  .method li:first-child { min-height: 0; padding: 28px 0; border-right: 0; }
  .site-footer { min-height: 145px; align-items: flex-start; justify-content: center; flex-direction: column; }
  .site-footer div { align-items: flex-start; flex-direction: column; gap: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}