:root {
  --ink: #12241c;
  --muted: #4a6358;
  --line: #c9ddd2;
  --paper: #f4faf6;
  --panel: #ffffff;
  --rail: #143528;
  --rail-ink: #e7f6ee;
  --accent: #128c5a;
  --accent-2: #0d6b44;
  --chip: #d8f3e4;
  --warn: #8a5a12;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
}

.skip {
  position: absolute;
  left: -999px;
}
.skip:focus { left: 12px; top: 12px; background: #fff; padding: 8px 12px; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 28px;
  background: var(--rail);
  color: var(--rail-ink);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.brand svg { display: block; }
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}
.nav a {
  color: var(--rail-ink);
  text-decoration: none;
  font-size: 14px;
  opacity: 0.92;
}
.nav a:hover { text-decoration: underline; }

.hero {
  padding: 36px 28px 20px;
  background:
    linear-gradient(120deg, rgba(18,140,90,0.08), transparent 50%),
    var(--paper);
  border-bottom: 1px solid var(--line);
}
.hero-kicker {
  font-size: 13px;
  color: var(--accent-2);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}
.hero h1 {
  font-size: 30px;
  line-height: 1.35;
  max-width: 18em;
  margin-bottom: 14px;
}
.hero p {
  max-width: 46em;
  color: var(--muted);
}

.shell {
  display: grid;
  grid-template-columns: 30% 1fr;
  min-height: 70vh;
}

.rail {
  background: var(--rail);
  color: var(--rail-ink);
  padding: 28px 22px 48px;
  position: sticky;
  top: 0;
  align-self: start;
  min-height: 100vh;
}
.rail h2 {
  font-size: 18px;
  line-height: 1.4;
  margin-bottom: 16px;
}
.rail p {
  font-size: 14px;
  opacity: 0.86;
  margin-bottom: 18px;
}
.actions {
  list-style: none;
  display: grid;
  gap: 10px;
}
.actions a {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  align-items: start;
  color: var(--rail-ink);
  text-decoration: none;
  padding: 10px 10px;
  border: 1px solid rgba(231,246,238,0.18);
  background: rgba(255,255,255,0.04);
}
.actions a:hover { background: rgba(255,255,255,0.1); }
.actions .num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
}
.actions small {
  display: block;
  opacity: 0.72;
  font-size: 12px;
  margin-top: 2px;
}

.content {
  padding: 28px 32px 64px;
  display: grid;
  gap: 28px;
}
.block {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 22px 24px 24px;
}
.block h2 {
  font-size: 22px;
  line-height: 1.4;
  margin-bottom: 12px;
}
.block p { margin-bottom: 12px; color: var(--ink); }
.block p:last-child { margin-bottom: 0; }

.steps {
  display: grid;
  gap: 10px;
  margin: 14px 0 4px;
}
.steps li {
  list-style: none;
  padding: 10px 12px 10px 14px;
  border-left: 3px solid var(--accent);
  background: var(--chip);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 4px;
}
.chips span {
  background: var(--chip);
  border: 1px solid #b7e0c8;
  padding: 4px 10px;
  font-size: 13px;
}

.table-wrap { overflow-x: auto; margin-top: 14px; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: #e7f6ee; font-weight: 700; }
tr:nth-child(even) td { background: #f7fbf8; }

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 12px;
}
.pair article {
  border: 1px dashed var(--line);
  padding: 12px 14px;
  background: #f8fdf9;
}
.pair h3 { font-size: 16px; margin-bottom: 8px; }

.faq {
  padding: 36px 32px 20px;
  background: #eef6f1;
  border-top: 1px solid var(--line);
}
.faq h2 { font-size: 22px; margin-bottom: 16px; }
.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  padding: 16px 18px;
  margin-bottom: 12px;
}
.faq-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

footer {
  background: var(--rail);
  color: var(--rail-ink);
  padding: 22px 28px 28px;
  display: grid;
  gap: 6px;
  font-size: 13px;
}

@media (max-width: 960px) {
  .shell { grid-template-columns: 1fr; }
  .rail { min-height: auto; position: relative; }
  .pair { grid-template-columns: 1fr; }
  .hero h1 { font-size: 24px; }
}