:root {
  --teal: #0d9488;
  --teal-deep: #0f5f59;
  --ice: #f3fbfa;
  --card: #ffffff;
  --ink: #134e4a;
  --muted: #3f6662;
  --line: #cce8e4;
  --warn: #b45309;
}

* { box-sizing: border-box; }
html { scroll-behavior: auto; }
body {
  margin: 0;
  background: var(--ice);
  color: var(--ink);
  font-family: "Segoe UI", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.8;
}

.bar {
  background: #fff;
  border-bottom: 3px solid var(--teal);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 5vw;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--teal-deep);
}
.nav { display: flex; flex-wrap: wrap; gap: 16px; }
.nav a { color: var(--teal-deep); text-decoration: none; font-size: 14px; }
.nav a:hover { text-decoration: underline; }

.hero {
  padding: 48px 5vw 32px;
  background: linear-gradient(180deg, #d5f5f2 0%, var(--ice) 100%);
}
.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(26px, 3.6vw, 38px);
  max-width: 18em;
  line-height: 1.35;
}
.hero p { margin: 0; max-width: 44em; color: var(--muted); font-size: 17px; }

.wrap { width: min(1100px, 92vw); margin: 0 auto; }
section { padding: 50px 0; }
h2 { margin: 0 0 16px; font-size: clamp(22px, 2.6vw, 28px); line-height: 1.4; }
.lead { color: var(--muted); margin: 0 0 22px; max-width: 48em; }
p { margin: 0 0 16px; }

.devices {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.device {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 18px 22px;
  box-shadow: 0 8px 20px rgba(13, 148, 136, 0.06);
}
.device svg { display: block; margin-bottom: 12px; }
.device h3 { margin: 0 0 12px; font-size: 18px; }
.meta {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 6px 10px;
  font-size: 14px;
  color: var(--muted);
}
.meta b { color: var(--teal-deep); font-weight: 600; }
.tag {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  background: #ccfbf1;
  color: var(--teal-deep);
}
.tag.warn { background: #ffedd5; color: var(--warn); }
.tag.risk { background: #fee2e2; color: #9f1239; }

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.step {
  background: #fff;
  border-radius: 12px;
  padding: 18px 16px;
  border-top: 4px solid var(--teal);
}
.step span {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--teal);
  margin-bottom: 8px;
}
.step h3 { margin: 0 0 8px; font-size: 16px; }
.step p { font-size: 14px; color: var(--muted); }

.offline .step { border-top-color: var(--warn); }
.offline .step span { color: var(--warn); }

table { width: 100%; border-collapse: collapse; background: #fff; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 12px 14px; text-align: left; vertical-align: top; }
th { background: var(--teal); color: #fff; }

.faq-list { margin: 0; padding: 0; list-style: none; }
.faq-list li {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 10px;
}
.faq-list h3 { margin: 0 0 8px; font-size: 17px; }
.faq-list p { color: var(--muted); font-size: 15px; }

.site-footer {
  background: var(--teal-deep);
  color: #d1faf5;
  padding: 34px 5vw 40px;
  font-size: 14px;
}
.site-footer p { margin: 0 0 10px; }

@media (max-width: 900px) {
  .devices, .steps { grid-template-columns: 1fr; }
  .bar { flex-direction: column; align-items: flex-start; gap: 10px; }
}