:root {
  color-scheme: light;
  --ink: #172d21;
  --muted: #53675b;
  --accent: #277a55;
  --accent-dark: #165b3d;
  --ground: #f4f7f2;
  --paper: #fffefa;
  --line: #dce4dd;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body {
  margin: 0;
  min-width: 320px;
  background: radial-gradient(ellipse at 5% 8%, #e8f1e5 0, transparent 40rem), var(--ground);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-dark); text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; border-radius: 4px; }
::selection { background: #d1e5d4; }
.shell { width: min(100% - 80px, 1120px); margin-inline: auto; }
.skip-link {
  position: absolute;
  top: -100px;
  left: 24px;
  z-index: 2;
  padding: 12px 20px;
  background: var(--paper);
}
.skip-link:focus { top: 12px; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 112px;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
.brand-name { font-size: 23px; font-weight: 750; letter-spacing: -0.06em; }
.brand-provider { display: block; margin-top: -4px; font-size: 10px; font-weight: 650; letter-spacing: 0.12em; text-transform: uppercase; }
.brand-mark {
  position: relative;
  display: block;
  width: 40px;
  height: 40px;
  overflow: hidden;
  flex-shrink: 0;
  border-radius: 13px;
  background: var(--accent);
}
.brand-mark::before, .brand-mark::after {
  position: absolute;
  content: "";
  width: 6px;
  height: 29px;
  border-radius: 999px;
  background: white;
  transform: rotate(38deg);
}
.brand-mark::before { left: 10px; top: 13px; }
.brand-mark::after { right: 10px; bottom: 13px; }
.header-nav { display: flex; align-items: center; gap: 30px; font-size: 14px; }
.header-nav a { text-decoration: none; }
.header-nav a:hover { text-decoration: underline; }
.language-link { padding: 7px 13px; border: 1px solid #cbd8cd; border-radius: 999px; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 350px;
  align-items: center;
  gap: 68px;
  padding: 76px 0 68px;
}
.eyebrow { margin: 0 0 19px; color: var(--accent-dark); font-size: 11px; font-weight: 750; letter-spacing: 0.14em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(45px, 6.2vw, 74px); font-weight: 650; line-height: 1.05; letter-spacing: -0.065em; }
.hero-description { max-width: 480px; margin: 24px 0 0; color: var(--muted); font-size: 19px; line-height: 1.7; }
.hero-link { display: inline-flex; align-items: center; gap: 12px; margin-top: 30px; font-size: 14px; font-weight: 650; text-decoration: none; }
.hero-link:hover { text-decoration: underline; }
.contact-card {
  position: relative;
  padding: 30px;
  border: 1px solid #cfdccd;
  border-radius: 22px;
  background: var(--paper);
  box-shadow: 0 16px 40px #29433108;
}
.contact-card .eyebrow { margin-bottom: 16px; }
.contact-card h2 { margin: 0; font-size: 26px; font-weight: 650; letter-spacing: -0.04em; line-height: 1.2; }
.contact-card p:not(.eyebrow) { margin: 14px 0 20px; color: var(--muted); font-size: 14px; }
.email-address { display: inline-block; font-size: 17px; font-weight: 600; overflow-wrap: anywhere; text-decoration: none; }
.email-address:hover { text-decoration: underline; }
.email-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 22px;
  min-height: 48px;
  padding: 12px 17px;
  border: 1px solid var(--accent-dark);
  border-radius: 9px;
  background: var(--accent-dark);
  color: #fff;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
  transition: background 150ms ease;
}
.email-button:hover { background: #103e2b; }
.contact-card .email-note { margin: 9px 0 0 !important; color: var(--muted); font-size: 11px !important; }
.quick-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-block: 1px solid var(--line); }
.quick-link { display: flex; align-items: center; gap: 15px; padding: 24px 22px; color: var(--ink); text-decoration: none; transition: background 150ms ease; }
.quick-link + .quick-link { border-left: 1px solid var(--line); }
.quick-link:first-child { padding-left: 0; }
.quick-link:last-child { padding-right: 0; }
.quick-link:hover { background: #e9efe5; }
.quick-icon { display: grid; width: 42px; height: 42px; flex-shrink: 0; place-items: center; border: 1px solid #d5e2d4; border-radius: 50%; color: var(--accent-dark); }
.quick-icon svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.quick-link strong { display: block; font-size: 14px; font-weight: 650; }
.quick-link small { display: block; margin-top: 1px; color: var(--muted); font-size: 12px; }
.quick-arrow { margin-left: auto; color: var(--accent-dark); }
.help-layout { display: grid; grid-template-columns: 265px minmax(0, 1fr); gap: 86px; padding: 70px 0 76px; }
.help-intro { align-self: start; position: sticky; top: 30px; }
.help-intro h2 { margin: 0; font-size: 32px; font-weight: 600; letter-spacing: -0.045em; line-height: 1.18; }
.help-intro > p { margin: 18px 0 26px; color: var(--muted); font-size: 14px; }
.topic-nav { display: flex; flex-direction: column; align-items: flex-start; gap: 13px; }
.topic-nav a { font-size: 13px; text-decoration: none; }
.topic-nav a:hover { text-decoration: underline; }
.local-note { display: flex; align-items: flex-start; gap: 10px; margin-top: 38px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.local-note svg { width: 17px; height: 17px; flex-shrink: 0; margin-top: 3px; fill: none; stroke: var(--accent); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.local-note p { margin: 0; }
.faq-group { scroll-margin-top: 28px; }
.faq-group + .faq-group { margin-top: 43px; }
.faq-group > h3 { margin: 0 0 15px; color: var(--accent-dark); font-size: 11px; font-weight: 750; letter-spacing: 0.13em; text-transform: uppercase; }
details { border-bottom: 1px solid var(--line); }
summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 19px 0;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 550;
  line-height: 1.45;
  letter-spacing: -0.015em;
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; flex-shrink: 0; color: var(--accent); font-size: 22px; font-weight: 400; line-height: 1; }
details[open] > summary::after { content: "−"; }
summary:hover { color: var(--accent-dark); }
.answer { padding: 0 28px 23px 0; color: var(--muted); font-size: 14px; }
.answer p { margin: 0; }
.answer p + p { margin-top: 12px; }
.answer ol { margin: 0; padding-left: 22px; }
.answer li { padding-left: 3px; margin-bottom: 9px; }
.answer strong { color: var(--ink); font-weight: 650; }
.answer .text-link { display: inline-block; margin-top: 14px; font-weight: 600; }
.before-email { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 70px; padding: 38px 42px; border: 1px solid #d4dfd1; border-radius: 20px; background: #eaf0e5; }
.before-email h2 { margin: 0 0 13px; font-size: 25px; font-weight: 600; letter-spacing: -0.035em; line-height: 1.3; }
.before-email p { margin: 0; color: var(--muted); font-size: 14px; }
.before-email ul { margin: 0; padding-left: 19px; font-size: 14px; }
.before-email li { margin-bottom: 5px; padding-left: 3px; }
.before-email li::marker { color: var(--accent); }
.before-email .privacy-reminder { margin-top: 13px; font-size: 12px; }
.site-footer { display: flex; justify-content: space-between; gap: 24px; padding: 31px 0 37px; margin-top: 35px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.site-footer p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; align-content: flex-start; gap: 22px; }
.footer-links a { text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }
html[lang="zh-Hans"] h1 { letter-spacing: -0.035em; font-weight: 650; }
html[lang="zh-Hans"] .eyebrow, html[lang="zh-Hans"] .faq-group > h3 { letter-spacing: 0.06em; }

@media (max-width: 960px) {
  .shell { width: min(100% - 48px, 1120px); }
  .hero { grid-template-columns: minmax(0, 1fr) 320px; gap: 35px; padding-block: 60px; }
  h1 { font-size: 58px; }
  .hero-description { font-size: 17px; }
  .quick-link { gap: 10px; padding-inline: 15px; }
  .quick-icon { width: 36px; height: 36px; }
  .quick-link small { font-size: 11px; }
  .quick-arrow { display: none; }
  .help-layout { grid-template-columns: 210px minmax(0, 1fr); gap: 45px; }
  .before-email { gap: 35px; padding: 30px; }
}
@media (max-width: 700px) {
  .shell { width: min(100% - 40px, 540px); }
  .site-header { min-height: 88px; gap: 16px; }
  .brand-mark { width: 35px; height: 35px; border-radius: 11px; }
  .brand-mark::before { left: 8px; top: 11px; }
  .brand-mark::after { right: 8px; bottom: 11px; }
  .brand-name { font-size: 21px; }
  .brand-provider { font-size: 9px; }
  .header-nav { gap: 14px; font-size: 12px; }
  .language-link { padding: 6px 10px; }
  .hero { grid-template-columns: 1fr; gap: 32px; padding: 46px 0 36px; }
  h1 { font-size: clamp(43px, 10vw, 58px); }
  .eyebrow { margin-bottom: 15px; font-size: 10px; }
  .hero-description { margin-top: 20px; font-size: 16px; }
  .hero-link { margin-top: 20px; }
  .contact-card { padding: 25px; border-radius: 18px; }
  .contact-card h2 { font-size: 24px; }
  .quick-links { grid-template-columns: 1fr; }
  .quick-link, .quick-link:first-child, .quick-link:last-child { padding: 17px 0; gap: 15px; }
  .quick-link + .quick-link { border-left: 0; border-top: 1px solid var(--line); }
  .quick-link small { font-size: 12px; }
  .quick-arrow { display: block; }
  .help-layout { grid-template-columns: 1fr; gap: 32px; padding: 43px 0; }
  .help-intro { position: static; }
  .help-intro h2 { font-size: 29px; }
  .help-intro > p { margin-bottom: 0; }
  .topic-nav, .local-note { display: none; }
  summary { padding-block: 18px; font-size: 16px; }
  .answer { padding-right: 13px; }
  .faq-group + .faq-group { margin-top: 32px; }
  .before-email { grid-template-columns: 1fr; gap: 22px; padding: 26px; border-radius: 18px; }
  .before-email h2 { font-size: 23px; }
  .site-footer { flex-direction: column; gap: 16px; margin-top: 28px; padding-block: 24px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}