/* Set 2: feature-driven app shell with sidebar */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { min-height: 100%; }
body {
  font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f3f6f5;
  color: #1c2b27;
  line-height: 1.7;
}
.shell { display: flex; min-height: 100vh; }
.side {
  width: 248px;
  background: #13241f;
  color: #d7efe8;
  padding: 28px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  flex-shrink: 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 22px;
  margin-bottom: 28px;
}
.side nav a {
  display: block;
  color: #b7d4cb;
  text-decoration: none;
  padding: 10px 12px;
  margin-bottom: 6px;
  border-left: 3px solid transparent;
  background: transparent;
}
.side nav a.current {
  color: #fff;
  background: #1e3b33;
  border-left-color: #2dd4bf;
}
.side .side-note {
  margin-top: 32px;
  font-size: 12px;
  color: #7f9d93;
}
.main { flex: 1; min-width: 0; }
.main-head {
  background: #fff;
  border-bottom: 1px solid #d5e3de;
  padding: 18px 36px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.main-head strong { color: #0f766e; }
.wrap { padding: 28px 36px 48px; max-width: 980px; }
h1 {
  font-size: 30px;
  line-height: 1.4;
  margin-bottom: 14px;
  color: #11332c;
}
h2 {
  font-size: 22px;
  margin: 0 0 12px;
  color: #115e59;
  padding-left: 10px;
  border-left: 4px solid #2dd4bf;
}
.lead { font-size: 17px; margin-bottom: 18px; }
.hero-box {
  background: #fff;
  border: 1px solid #d5e3de;
  padding: 26px;
  margin-bottom: 28px;
}
.btn {
  display: inline-block;
  background: #0f766e;
  color: #fff;
  text-decoration: none;
  padding: 12px 22px;
  font-weight: 700;
  border-radius: 999px;
}
.btn:hover { background: #115e59; }
.btn-line {
  display: inline-block;
  margin-left: 10px;
  color: #0f766e;
  text-decoration: none;
  font-weight: 600;
}
.feat {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  background: #fff;
  border: 1px solid #d5e3de;
  padding: 18px;
  margin-bottom: 14px;
}
.feat-ico {
  width: 72px;
  height: 72px;
  background: #ecfdf8;
  display: flex;
  align-items: center;
  justify-content: center;
}
.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 14px 0 22px;
}
.card {
  background: #fff;
  border: 1px solid #d5e3de;
  padding: 16px;
}
.card h3 { font-size: 16px; color: #115e59; margin-bottom: 8px; }
.section { margin: 34px 0; }
p { margin-bottom: 12px; }
ul, ol { margin: 0 0 12px 20px; }
table { width: 100%; border-collapse: collapse; background: #fff; margin: 12px 0 18px; }
th, td { border: 1px solid #cde0da; padding: 8px 10px; text-align: left; }
th { background: #134e4a; color: #fff; }
.faq-item { background: #fff; border: 1px solid #d5e3de; padding: 14px 16px; margin-bottom: 10px; }
.faq-item h3 { font-size: 16px; margin-bottom: 8px; color: #134e4a; }
.note { background: #fff7ed; border: 1px solid #fdba74; padding: 10px 12px; margin: 12px 0; }
footer {
  background: #13241f;
  color: #b7d4cb;
  padding: 24px 36px 28px;
  font-size: 13px;
}
footer a { color: #5eead4; margin-right: 14px; }
.legal { color: #7f9d93; margin-top: 10px; }
@media (max-width: 900px) {
  .shell { display: block; }
  .side { position: relative; width: auto; height: auto; }
  .side nav a { display: inline-block; }
  .grid2 { grid-template-columns: 1fr; }
  .wrap, .main-head, footer { padding-left: 18px; padding-right: 18px; }
}