:root {
  --cyan: #0891B2;
  --cyan-deep: #155E75;
  --wash: #ECFEFF;
  --paper: #FFFFFF;
  --ink: #164E63;
  --muted: #3F5F66;
  --line: #A5F3FC;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--wash);
  color: var(--ink);
  line-height: 1.75;
}

a { color: var(--cyan-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: min(1140px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand {
  color: var(--cyan);
  font-weight: 800;
  letter-spacing: 0.03em;
}

.nav { display: flex; flex-wrap: wrap; gap: 8px 16px; font-size: 14px; }
.nav a { color: var(--cyan-deep); }

.hero { padding: 40px 0 12px; }

.hero h1 {
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.35;
  max-width: 16em;
}

.hero-lead { margin-top: 14px; max-width: 42em; color: var(--muted); }

.flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin: 28px 0 8px;
}

.flow-step {
  background: var(--paper);
  border: 2px solid var(--cyan);
  border-radius: 14px;
  padding: 14px 12px;
  text-align: center;
  position: relative;
}

.flow-step strong {
  display: block;
  color: var(--cyan);
  font-size: 13px;
  margin-bottom: 4px;
}

.flow-step::after {
  content: "";
  position: absolute;
  right: -8px;
  top: 50%;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.flow-step:last-child::after { display: none; }

.section { padding: 34px 0; }

.section h2 {
  font-size: clamp(22px, 3vw, 28px);
  color: var(--cyan-deep);
  margin-bottom: 16px;
}

.section p { margin-bottom: 14px; }

.clip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 16px 0;
}

.clip-card {
  background: var(--paper);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 8px 24px rgba(8, 145, 178, 0.08);
}

.clip-card h3 { font-size: 17px; margin: 10px 0 8px; }

.steps {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin: 16px 0;
}

.step {
  min-width: 210px;
  background: var(--paper);
  border-top: 4px solid var(--cyan);
  border-radius: 12px;
  padding: 14px;
}

.step b { color: var(--cyan); display: block; margin-bottom: 6px; }

.table-wrap { overflow-x: auto; margin: 16px 0; }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
}

th, td {
  border: 1px solid var(--line);
  padding: 12px;
  text-align: left;
  vertical-align: top;
}

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

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 0;
}

.split article {
  background: var(--paper);
  border-radius: 14px;
  padding: 16px;
}

.svg-card {
  background: var(--paper);
  border-radius: 16px;
  padding: 16px;
  margin: 16px 0;
}

.faq-list { display: grid; gap: 12px; }

.faq-item {
  background: var(--paper);
  border-radius: 12px;
  padding: 14px 16px;
}

.faq-item h3 { font-size: 17px; color: var(--cyan-deep); margin-bottom: 6px; }

.site-footer {
  background: var(--cyan-deep);
  color: #E0F2FE;
  padding: 28px 0 40px;
  font-size: 14px;
}

.site-footer p { margin-bottom: 8px; }

@media (max-width: 900px) {
  .header-bar { flex-direction: column; align-items: flex-start; padding: 12px 0; }
  .flow, .clip-grid, .split { grid-template-columns: 1fr; }
  .flow-step::after { display: none; }
}