:root {
  --ink: #071019;
  --ink-2: #102534;
  --ink-3: #17394a;
  --paper: #f4f6f2;
  --white: #ffffff;
  --text: #1d313c;
  --muted: #5d717b;
  --line: #d4ddd7;
  --line-dark: #294454;
  --yellow: #f0c84a;
  --green: #168b58;
  --green-dark: #0d6842;
  --cyan: #168b99;
  --red: #c94040;
  --radius: 8px;
  --shell: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font: 16px/1.75 "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", "Segoe UI", sans-serif;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; }
::selection { color: var(--ink); background: #c6eed5; }
:focus-visible { outline: 3px solid #3dbd78; outline-offset: 4px; }
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 14px;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--green);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }
.shell { width: min(calc(100% - 40px), var(--shell)); margin: 0 auto; }
.content-header {
  position: sticky;
  top: 0;
  z-index: 40;
  color: #dce6eb;
  background: rgba(7, 16, 25, .97);
  border-bottom: 1px solid #203746;
  backdrop-filter: blur(14px);
}
.content-header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.content-brand { display: inline-flex; align-items: center; gap: 11px; color: var(--white); font-size: 20px; font-weight: 900; }
.content-brand b { color: var(--yellow); }
.content-brand span {
  padding-left: 12px;
  color: #91a5af;
  border-left: 1px solid #314b59;
  font-size: 12px;
  font-weight: 700;
}
.content-nav { display: flex; align-items: center; gap: 22px; font-size: 13px; font-weight: 750; }
  .content-nav a { padding: 9px 0; color: #b9c7cf; }
  .content-nav a:hover,
  .content-nav a[aria-current="page"] { color: var(--white); }
  .content-nav .nav-home {
    padding: 9px 12px;
    color: #dce6eb;
    border: 1px solid #435b69;
    border-radius: 6px;
  }
  .content-nav .nav-home:hover { border-color: #7b929e; }
  .content-nav .nav-download {
  padding: 10px 16px;
  color: var(--ink);
  background: var(--yellow);
  border-radius: var(--radius);
}
.menu-toggle { display: none; }
.hero {
  color: #dce6eb;
  background: var(--ink);
  border-bottom: 1px solid #2a4554;
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 430px);
  gap: 58px;
  align-items: center;
  padding: 58px 0 54px;
}
.hero-copy { min-width: 0; }
.eyebrow {
  margin: 0 0 12px;
  color: var(--yellow);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.hero h1 {
  max-width: 760px;
  margin: 0;
  color: var(--white);
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.16;
}
.hero-lead {
  max-width: 720px;
  margin: 20px 0 0;
  color: #b9c8d0;
  font-size: 17px;
}
.hero-points { display: flex; flex-wrap: wrap; gap: 9px; margin: 24px 0 0; padding: 0; list-style: none; }
.hero-points li {
  padding: 7px 11px;
  color: #dce8e2;
  background: #10251d;
  border: 1px solid #355747;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 750;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 850;
}
.button-primary { color: var(--ink); background: var(--yellow); }
.button-secondary { color: #dce8ef; background: transparent; border: 1px solid #435b69; }
.button-secondary:hover { border-color: #7b929e; }
.hero-media { position: relative; min-width: 0; }
.hero-shot {
  margin: 0;
  padding: 10px;
  background: #101e29;
  border: 1px solid #2d4655;
  border-radius: var(--radius);
}
.hero-shot img { width: 100%; max-height: 540px; object-fit: contain; border-radius: 5px; }
.hero-shot.is-wide img { max-height: 340px; }
.hero-shot figcaption { padding: 10px 5px 2px; color: #91a4ae; text-align: center; font-size: 12px; line-height: 1.55; }
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 52px;
  align-items: start;
  padding: 54px 0 88px;
}
.article { min-width: 0; }
.article > section { padding: 0 0 42px; margin: 0 0 42px; border-bottom: 1px solid var(--line); }
.article > section:last-child { padding-bottom: 0; margin-bottom: 0; border-bottom: 0; }
.article h2 { margin: 0 0 18px; color: var(--ink); font-size: clamp(25px, 3vw, 34px); line-height: 1.3; }
.article h3 { margin: 32px 0 10px; color: #163747; font-size: 20px; line-height: 1.4; }
.article h4 { margin: 24px 0 8px; color: #264c5c; font-size: 16px; }
.article p { margin: 12px 0; color: #354c57; }
.article ul,
.article ol { margin: 12px 0 20px; padding-left: 24px; }
.article li { margin: 7px 0; padding-left: 2px; }
.article li::marker { color: var(--green); font-weight: 900; }
.article a { color: #08643f; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.lead {
  padding: 15px 17px;
  color: #29414d;
  background: #eaf3ed;
  border-left: 4px solid var(--green);
  border-radius: 4px;
}
.important {
  background: #fff7df;
  border-left-color: #d6a522;
}
.checklist { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 24px; padding: 0; list-style: none; }
.checklist li { position: relative; padding: 12px 0 12px 28px; border-bottom: 1px solid var(--line); }
.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green-dark);
  font-weight: 900;
}
.steps { display: grid; gap: 14px; margin: 20px 0; padding: 0; list-style: none; counter-reset: step; }
.steps li {
  position: relative;
  min-height: 78px;
  padding: 17px 18px 17px 72px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 16px;
  left: 17px;
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 900;
}
.steps strong { display: block; color: var(--ink); }
.steps span { color: var(--muted); font-size: 14px; }
.table-wrap { width: 100%; margin: 18px 0 24px; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; min-width: 620px; border-collapse: collapse; background: var(--white); }
th,
td { padding: 13px 14px; text-align: left; vertical-align: top; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 14px; line-height: 1.6; }
th { color: var(--white); background: #244b62; font-weight: 850; }
tbody tr:nth-child(even) { background: #f0f5f1; }
tbody tr:last-child td { border-bottom: 0; }
th:last-child,
td:last-child { border-right: 0; }
.inline-shot {
  margin: 24px 0;
  padding: 11px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.inline-shot.is-narrow { max-width: 620px; margin-right: auto; margin-left: auto; }
.inline-shot img { width: 100%; max-height: 660px; object-fit: contain; border-radius: 5px; }
.inline-shot figcaption { padding: 10px 5px 0; color: var(--muted); text-align: center; font-size: 13px; }
.faq-list { display: grid; gap: 10px; }
.faq-list details { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.faq-list summary { padding: 15px 17px; color: var(--ink); cursor: pointer; font-weight: 850; }
.faq-list details p { margin: 0; padding: 0 17px 16px; }
.sidebar { position: sticky; top: 92px; }
.sidebar-box { padding: 20px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.sidebar-box + .sidebar-box { margin-top: 16px; }
.sidebar-title { margin: 0 0 12px; color: var(--ink); font-size: 13px; font-weight: 900; }
.sidebar-nav { display: grid; gap: 3px; }
.sidebar-nav a { padding: 7px 0; color: #536a75; border-bottom: 1px solid #edf1ee; font-size: 13px; }
.sidebar-nav a:last-child { border-bottom: 0; }
.sidebar-nav a:hover { color: var(--green-dark); }
.sidebar-note { margin: 0; color: var(--muted); font-size: 13px; }
.sidebar-download { display: block; padding: 10px 12px; color: var(--ink); background: var(--yellow); border-radius: 6px; text-align: center; font-size: 13px; font-weight: 900; }
.related { margin-top: 58px; padding-top: 30px; border-top: 2px solid var(--ink); }
.related h2 { margin-top: 0; }
.related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.related-grid a {
  display: block;
  padding: 15px 16px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
}
.related-grid a:hover { border-color: #7da894; }
.related-grid strong { display: block; }
.related-grid span { color: var(--muted); font-size: 13px; }
.trust-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.trust-item { padding: 18px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.trust-item strong { display: block; margin-bottom: 6px; color: var(--ink); }
.trust-item p { margin: 0; color: var(--muted); font-size: 14px; }
.contact-list { margin: 18px 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.contact-list li { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 14px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.contact-list strong { color: var(--ink); }
.site-footer { color: #9fb0b8; background: var(--ink); border-top: 1px solid var(--line-dark); }
.footer-main { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, .8fr); gap: 48px; padding: 38px 0 32px; }
.footer-brand { color: var(--white); font-size: 20px; font-weight: 900; }
.footer-copy { max-width: 650px; margin: 10px 0 0; color: #81939e; font-size: 13px; line-height: 1.8; }
.footer-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 7px 22px; align-content: start; font-size: 13px; }
.footer-links a:hover { color: var(--white); }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; padding: 17px 0 22px; border-top: 1px solid #1d313d; font-size: 12px; }
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 38px; }
  .hero-media { max-width: 620px; }
  .page-layout { grid-template-columns: 1fr; gap: 38px; padding-top: 38px; }
  .sidebar { position: static; }
  .sidebar { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .sidebar-box + .sidebar-box { margin-top: 0; }
}
@media (max-width: 760px) {
  .shell { width: min(calc(100% - 28px), var(--shell)); }
  .content-header-inner { min-height: 64px; }
  .content-brand span { display: none; }
  .content-nav { gap: 12px; }
  .content-nav a:not(.nav-download):not(.nav-home) { display: none; }
  .content-nav .nav-download { padding: 9px 12px; }
  .hero-inner { padding: 40px 0 38px; }
  .hero h1 { font-size: clamp(32px, 10vw, 46px); }
  .hero-lead { font-size: 15px; }
  .hero-shot img { max-height: 460px; }
  .hero-shot.is-wide img { max-height: 260px; }
  .article h2 { font-size: 26px; }
  .checklist,
  .related-grid,
  .trust-grid,
  .sidebar { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: 26px; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 7px; }
  .contact-list li { grid-template-columns: 1fr; gap: 3px; }
}
@media (max-width: 460px) {
  .hero-actions .button { width: 100%; }
  .steps li { padding-left: 62px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}