:root {
  --teal: #0f766e;
  --teal-soft: #ccfbf1;
  --slate: #475569;
  --ink: #0f172a;
  --line: #cbd5e1;
  --bg: #ffffff;
  --wash: #f8fafc;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Georgia, "Songti SC", "SimSun", "Microsoft YaHei", serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}

a { color: var(--teal); }

.top {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: end;
  gap: 1.5rem;
  padding: 1.1rem 5vw 0.9rem;
  border-bottom: 3px solid var(--teal);
  background: var(--wash);
}

.brand {
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  font-weight: 700;
  color: var(--teal);
  text-decoration: none;
  font-size: 1.15rem;
}

.top nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.3rem;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  font-size: 0.9rem;
}

.top nav a { text-decoration: none; color: var(--slate); }
.top nav a:hover { color: var(--teal); }

.hero {
  padding: 2.6rem 5vw 1.6rem;
  max-width: 46rem;
}

.hero h1 {
  font-size: 1.85rem;
  line-height: 1.35;
  color: var(--teal);
}

.hero p { color: var(--slate); margin: 0 0 0.8rem; }
.hero time { font-size: 0.85rem; color: #64748b; }

.phen {
  margin: 0 5vw 2.2rem;
}

.phen h2 { color: var(--teal); }

.row {
  display: grid;
  grid-template-columns: 1.1fr 1.2fr 1fr;
  gap: 0;
  margin: 0.9rem 0;
  border: 1px solid var(--line);
}

.row > div {
  padding: 0.95rem 1rem;
}

.row .k { background: var(--teal); color: #fff; font-family: "Segoe UI", sans-serif; }
.row .c { background: var(--wash); }
.row .n { background: var(--teal-soft); }

.row strong {
  display: block;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.cause,
.flow,
.recur,
.checks,
.session,
.faq {
  margin: 0 5vw 2.2rem;
}

.cause table,
.checks table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
}

th, td {
  border: 1px solid var(--line);
  padding: 0.6rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

th { background: var(--teal); color: #fff; }

.rail {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin: 1.1rem 0;
  overflow: auto;
}

.rail li {
  list-style: none;
  min-width: 12rem;
  flex: 1;
  padding: 1rem 1rem 1rem 1.1rem;
  border-top: 6px solid var(--teal);
  background: var(--wash);
  position: relative;
}

.rail li + li::before {
  content: "";
  position: absolute;
  left: -0.55rem;
  top: 1.35rem;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-left: 10px solid var(--teal);
}

.rail b {
  display: block;
  font-family: "Segoe UI", sans-serif;
  color: var(--teal);
  margin-bottom: 0.35rem;
}

.recur {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0.8rem;
  padding: 1.1rem 1.2rem;
  background: var(--teal-soft);
  border-left: 6px solid var(--teal);
}

.icon-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem 1.2rem;
}

.icon-item {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.6rem;
}

.faq details {
  border: 1px solid var(--line);
  margin-bottom: 0.55rem;
  padding: 0.55rem 0.8rem;
  background: var(--wash);
}

summary { cursor: pointer; font-weight: 700; color: var(--teal); font-family: "Segoe UI", "PingFang SC", sans-serif; }

.foot {
  background: #0f172a;
  color: #cbd5e1;
  padding: 1.6rem 5vw 2rem;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  font-size: 0.9rem;
}

.foot p { margin: 0 0 0.5rem; }

@media (max-width: 860px) {
  .row { grid-template-columns: 1fr; }
  .icon-grid { grid-template-columns: 1fr; }
  .top { grid-template-columns: 1fr; }
}