:root {
  --mint: #2f8f7d;
  --mint-deep: #1d5f54;
  --mint-soft: #d7f1ea;
  --paper: #fffcf7;
  --ink: #24302e;
  --muted: #4f6460;
  --chip: #e8f7f2;
  --line: #c5ddd6;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
}

a { color: var(--mint-deep); }
.header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: 14px 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--mint-deep); }
.header nav a {
  text-decoration: none;
  color: var(--mint);
  margin-left: 14px;
  font-size: 14px;
}
.header nav a:hover { text-decoration: underline; }

.hero {
  padding: 32px 5% 20px;
  background: linear-gradient(180deg, var(--mint-soft), var(--paper));
}
.hero h1 { font-size: 28px; color: var(--mint-deep); margin-bottom: 12px; }
.hero p { max-width: 48em; margin-bottom: 8px; color: var(--muted); }

.block { padding: 28px 5%; }
.block h2 {
  font-size: 21px;
  color: var(--mint-deep);
  margin-bottom: 14px;
}

table.diff {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
table.diff th {
  background: var(--mint);
  color: #fff;
  padding: 10px;
  text-align: left;
}
table.diff td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  vertical-align: top;
  font-size: 14px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 12px 0 18px;
}
.chip {
  background: var(--chip);
  border: 1px solid var(--mint);
  color: var(--mint-deep);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
}

.filter-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.filter-cards article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
}
.filter-cards h3 { color: var(--mint-deep); margin: 8px 0; font-size: 16px; }

.mini-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.mini-4 article {
  background: var(--mint-soft);
  padding: 14px 12px;
  border-radius: 8px;
  min-height: 140px;
}
.mini-4 h3 { font-size: 15px; color: var(--mint-deep); margin: 8px 0 6px; }
.mini-4 p { font-size: 13px; color: var(--muted); }

.steps-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.steps-bar li {
  list-style: none;
  background: #fff;
  border-top: 4px solid var(--mint);
  padding: 12px;
  font-size: 14px;
}

.qa { margin: 14px 0; padding-bottom: 12px; border-bottom: 1px dashed var(--line); }
.qa h3 { font-size: 16px; color: var(--mint-deep); margin-bottom: 6px; }

footer {
  background: var(--mint-deep);
  color: #e5f5f0;
  padding: 24px 5% 32px;
  font-size: 13px;
}
footer p { margin: 8px 0; }
footer .copy { color: #b7e6da; margin-top: 14px; }

@media (max-width: 900px) {
  .mini-4, .steps-bar, .filter-cards { grid-template-columns: 1fr 1fr; }
  .header { flex-direction: column; align-items: flex-start; gap: 8px; }
}
@media (max-width: 560px) {
  .mini-4, .steps-bar, .filter-cards { grid-template-columns: 1fr; }
}