:root {
  --teal: #0d7377;
  --teal-2: #14919b;
  --wash: #e8f4f4;
  --ink: #163033;
  --orange: #f26b21;
  --card: #ffffff;
  --line: #b9d6d6;
  --muted: #4a6668;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
  background: #f4fbfb;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.72;
}
.bar {
  background: var(--teal);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 28px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand {
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
}
.nav a {
  color: #d7f3f3;
  text-decoration: none;
  margin-left: 18px;
  font-size: 14px;
}
.nav a.current {
  color: #fff;
  border-bottom: 3px solid var(--orange);
  padding-bottom: 4px;
  font-weight: 700;
}

.hero {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 22px 10px;
}
.hero h1 { font-size: 30px; line-height: 1.4; margin-bottom: 14px; }
.hero p { color: var(--muted); margin-bottom: 18px; }
.btn-main {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--orange);
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  padding: 12px 22px;
  border-radius: 999px;
}
.btn-line {
  display: inline-flex;
  margin-left: 10px;
  color: var(--teal);
  font-weight: 700;
  text-decoration: none;
}

.rail {
  max-width: 820px;
  margin: 20px auto 48px;
  padding: 0 22px;
}
.step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  margin-bottom: 8px;
  position: relative;
}
.step:before {
  content: "";
  position: absolute;
  left: 28px;
  top: 64px;
  bottom: -8px;
  width: 3px;
  background: var(--line);
}
.step:last-child:before { display: none; }
.num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--teal);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 8px solid var(--teal-2);
  padding: 18px 18px 14px;
  border-radius: 0 10px 10px 0;
}
.card h2 { font-size: 20px; margin-bottom: 8px; color: var(--teal); }
.card p { margin-bottom: 10px; }
.card ul { margin: 0 0 8px 1.2em; }

.plain {
  background: var(--wash);
  padding: 18px;
  border-radius: 10px;
  margin: 18px 0;
}
.plain h2 { font-size: 20px; color: var(--teal); margin-bottom: 10px; }
table { width: 100%; border-collapse: collapse; background: #fff; font-size: 14.5px; }
th, td { border: 1px solid var(--line); padding: 10px; text-align: left; }
th { background: var(--teal); color: #fff; }

.dl-stack a {
  display: block;
  background: #fff;
  border: 1px dashed var(--teal);
  padding: 10px 14px;
  margin: 8px 0;
  text-decoration: none;
  color: var(--teal);
  font-weight: 700;
  border-radius: 8px;
}
.faq h3 { font-size: 16px; margin: 14px 0 6px; color: #0a5558; }

.footer {
  background: #0a3d40;
  color: #d5ecec;
  padding: 24px 22px 32px;
  font-size: 13px;
  line-height: 1.8;
  text-align: left;
}
.footer-inner { max-width: 820px; margin: 0 auto; }
.footer a { color: #9ee7ea; }
.safe { color: #ffd2b3; }

@media (max-width: 640px) {
  .bar { flex-wrap: wrap; }
  .nav { width: 100%; margin-top: 8px; }
  .nav a { margin-left: 0; margin-right: 14px; }
  .step { grid-template-columns: 1fr; }
  .step:before { display: none; }
  .btn-line { display: block; margin: 10px 0 0; }
}