html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: #f0fdfa;
  color: #0f172a;
  font-family: system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
}

.head-stack {
  background: #0f766e;
  color: #ecfdf5;
  text-align: center;
  padding: 22px 16px 0;
}
.head-stack .mark {
  display: inline-block;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: #fff;
  text-decoration: none;
}
.tabs {
  display: flex;
  justify-content: center;
  gap: 0;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}
.tabs a {
  display: block;
  padding: 12px 28px;
  color: #ccfbf1;
  text-decoration: none;
  border-bottom: 3px solid transparent;
}
.tabs a.on { background: #f0fdfa; color: #0f766e; border-bottom-color: #0f766e; font-weight: 700; }

.banner {
  width: min(1200px, calc(100% - 32px));
  margin: 28px auto 8px;
  background: #115e59;
  color: #fff;
  padding: 40px 36px 32px;
  text-align: center;
}
.banner h1 { margin: 0 0 14px; font-size: 30px; line-height: 1.4; }
.banner p { margin: 0 auto 22px; max-width: 720px; color: #ccfbf1; }
.acts { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; }
.acts a, .chip a {
  display: inline-block;
  padding: 11px 20px;
  text-decoration: none;
  font-weight: 700;
}
.acts .go { background: #facc15; color: #134e4a; }
.acts .sub { background: transparent; color: #fff; border: 1px solid #5eead4; }

.board { width: min(1200px, calc(100% - 32px)); margin: 0 auto 28px; }
.board h2 { font-size: 22px; margin: 32px 0 14px; color: #134e4a; }
.trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.tile {
  background: #fff;
  border: 1px solid #99f6e4;
  padding: 18px 16px 16px;
}
.tile h3 { margin: 8px 0 8px; font-size: 17px; }
.tile p { margin: 0; color: #334155; }
.ico { width: 28px; height: 28px; fill: none; stroke: #0f766e; stroke-width: 1.8; }

.sheet {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
.sheet th, .sheet td {
  border: 1px solid #99f6e4;
  padding: 9px 10px;
  text-align: left;
}
.sheet th { background: #ccfbf1; color: #115e59; }

.flow { background: #fff; border: 1px dashed #14b8a6; padding: 16px 20px; }
.qa { background: #fff; margin: 0; padding: 0; }
.qa dt { background: #ccfbf1; padding: 10px 14px; font-weight: 700; margin-top: 8px; }
.qa dd { margin: 0; padding: 10px 14px 14px; color: #334155; border: 1px solid #99f6e4; border-top: 0; }

.base {
  background: #042f2e;
  color: #99f6e4;
  padding: 28px 0;
  font-size: 13px;
}
.base .board { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 20px; }
.base a { color: #fde68a; }
.ok { color: #86efac; }

@media (max-width: 860px) {
  .trio, .base .board { grid-template-columns: 1fr; }
  .tabs { flex-wrap: wrap; }
}