:root {
  --ink: #173238;
  --muted: #5a7174;
  --paper: #f7faf9;
  --panel: #e8f1ef;
  --teal: #0b6864;
  --teal-dark: #084d4a;
  --line: #c8d7d4;
  --signal: #e45b3f;
  --white: #ffffff;
  --shadow: 0 20px 60px rgba(23, 50, 56, .09);
  --display: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  --body: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(11, 104, 100, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 104, 100, .035) 1px, transparent 1px),
    var(--paper);
  background-size: 42px 42px;
  font-family: var(--body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-underline-offset: .22em; }

.skip-link {
  position: fixed;
  z-index: 20;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: var(--white);
  background: var(--teal-dark);
  transform: translateY(-160%);
}

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

.site-header {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 48px));
  min-height: 84px;
  margin: 0 auto;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: .04em;
}

.brand-mark {
  display: flex;
  gap: 2px;
  align-items: center;
  height: 24px;
}

.brand-mark i {
  display: block;
  width: 3px;
  border-radius: 4px;
  background: var(--teal);
}

.brand-mark i:nth-child(1), .brand-mark i:nth-child(5) { height: 8px; }
.brand-mark i:nth-child(2), .brand-mark i:nth-child(4) { height: 16px; }
.brand-mark i:nth-child(3) { height: 24px; background: var(--signal); }

nav { display: flex; gap: 28px; }

nav a {
  padding: 8px 0;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

nav a[aria-current="page"] {
  color: var(--ink);
  box-shadow: inset 0 -2px var(--signal);
}

main, footer { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }

.hero {
  position: relative;
  min-height: 610px;
  padding: 104px 0 80px;
  overflow: hidden;
}

.coordinate, .eyebrow {
  margin: 0 0 18px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 750;
  line-height: 1.4;
  letter-spacing: .2em;
}

.hero h1 {
  max-width: 790px;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(56px, 8.5vw, 116px);
  font-weight: 700;
  line-height: 1.03;
  letter-spacing: -.06em;
}

.hero h1 em { color: var(--teal); font-style: normal; }

.lede {
  max-width: 580px;
  margin: 34px 0 28px;
  color: var(--muted);
  font-size: 18px;
}

.primary-action {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  color: var(--white);
  background: var(--teal);
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(11, 104, 100, .2);
}

.primary-action:hover { background: var(--teal-dark); }

.sound-route {
  position: absolute;
  right: 2%;
  bottom: 62px;
  display: flex;
  gap: 8px;
  align-items: center;
  width: 38%;
  height: 200px;
  padding: 0 24px;
  border: 1px solid var(--line);
  border-radius: 50%;
  transform: rotate(-9deg);
}

.sound-route::after {
  position: absolute;
  top: 50%;
  right: -6px;
  width: 13px;
  height: 13px;
  border: 5px solid var(--paper);
  border-radius: 50%;
  background: var(--signal);
  content: "";
}

.sound-route span {
  flex: 1;
  height: 18%;
  border-radius: 6px;
  background: var(--teal);
  opacity: .78;
}

.sound-route span:nth-child(2), .sound-route span:nth-child(6) { height: 42%; }
.sound-route span:nth-child(3), .sound-route span:nth-child(5) { height: 70%; }
.sound-route span:nth-child(4) { height: 96%; background: var(--signal); }

.section {
  padding: 96px 0;
  border-top: 1px solid var(--line);
}

.section-heading h2, .contact-panel h2 {
  max-width: 680px;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.15;
  letter-spacing: -.045em;
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 52px;
}

.help-card {
  min-height: 260px;
  padding: 30px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .68);
  box-shadow: var(--shadow);
}

.card-symbol {
  display: grid;
  width: 42px;
  height: 42px;
  margin-bottom: 40px;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: var(--teal);
  font-family: var(--display);
}

.help-card:nth-child(4) .card-symbol { background: var(--signal); }

.help-card h3, .steps h3 {
  margin: 0 0 8px;
  font-size: 20px;
  line-height: 1.4;
}

.help-card p, .steps p { margin: 0; color: var(--muted); }

.split-section {
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: 80px;
}

.steps article {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 18px;
  padding: 30px 0;
  border-top: 1px solid var(--line);
}

.steps article:last-child { border-bottom: 1px solid var(--line); }
.steps article > span { color: var(--signal); font-weight: 800; letter-spacing: .08em; }

.contact-panel {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 80px;
  margin-block: 60px 100px;
  padding: 58px;
  border: 0;
  color: var(--white);
  background: var(--ink);
}

.contact-panel .eyebrow { color: #77ccc5; }
.contact-panel p { max-width: 640px; color: #cad9d7; }

.contact-detail { display: grid; align-content: center; gap: 4px; }
.contact-detail span { margin-top: 18px; color: #8eaaa7; font-size: 12px; letter-spacing: .12em; }
.contact-detail a { font-weight: 650; overflow-wrap: anywhere; }

.policy-layout {
  display: grid;
  grid-template-columns: minmax(240px, .7fr) minmax(0, 1.3fr);
  gap: clamp(50px, 8vw, 120px);
  padding: 96px 0 120px;
}

.policy-intro { align-self: start; position: sticky; top: 40px; }

.policy-intro h1 {
  margin: 0 0 24px;
  font-family: var(--display);
  font-size: clamp(54px, 7vw, 88px);
  line-height: 1;
  letter-spacing: -.055em;
}

.policy-intro > p { color: var(--muted); }
.policy-summary { padding: 24px 0; border-block: 1px solid var(--line); }
.text-link { color: var(--teal); font-weight: 700; }

.policy-content section {
  padding: 0 0 46px;
  margin-bottom: 46px;
  border-bottom: 1px solid var(--line);
}

.policy-content section:last-child { margin-bottom: 0; }

.policy-content h2 {
  margin: 0 0 22px;
  font-family: var(--display);
  font-size: 30px;
  line-height: 1.3;
}

.policy-content h3 { margin: 26px 0 6px; font-size: 17px; }
.policy-content p, .policy-content li { color: var(--muted); }
.policy-content ul { padding-left: 1.25em; }
.policy-content li + li { margin-top: 12px; }
.policy-content strong { color: var(--ink); }

footer {
  display: flex;
  justify-content: space-between;
  padding: 30px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

:focus-visible { outline: 3px solid var(--signal); outline-offset: 4px; }

@media (max-width: 760px) {
  .site-header, main, footer { width: min(100% - 32px, 1180px); }
  .site-header { min-height: 70px; }
  nav { gap: 16px; }
  .hero { min-height: auto; padding: 76px 0 300px; }
  .hero h1 { font-size: clamp(48px, 16vw, 76px); }
  .sound-route { right: 1%; bottom: 62px; width: 78%; height: 150px; }
  .section { padding: 70px 0; }
  .help-grid, .split-section, .contact-panel, .policy-layout { grid-template-columns: 1fr; }
  .help-card { min-height: 230px; }
  .split-section, .contact-panel, .policy-layout { gap: 46px; }
  .contact-panel { margin-block: 40px 70px; padding: 34px 24px; }
  .policy-layout { padding: 70px 0 90px; }
  .policy-intro { position: static; }
  footer { display: block; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e9f2f0;
    --muted: #afc2c0;
    --paper: #102528;
    --panel: #193437;
    --teal: #72c9c2;
    --teal-dark: #4baea7;
    --line: #355154;
    --signal: #ff8067;
    --white: #102528;
    --shadow: none;
  }
  .help-card { background: rgba(25, 52, 55, .75); }
  .contact-panel { color: #eff7f5; background: #071719; }
  .primary-action { color: #082624; }
}