/* 第1套 根域名：官方蓝白、居中卡片、区块交替 */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: auto; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #1f2d3d;
  background: #ffffff;
  line-height: 1.8;
  font-size: 16px;
}
a { color: #1d4ed8; text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { vertical-align: middle; }
.wrap { max-width: 1100px; margin: 0 auto; padding: 0 22px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: #fff;
  border-bottom: 1px solid #dbe4f3;
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  color: #12305a;
}
.brand:hover { text-decoration: none; }
.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: #1d4ed8;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.nav { display: flex; gap: 4px; }
.nav a {
  padding: 8px 16px;
  border-radius: 8px;
  color: #3d4f66;
  font-weight: 600;
  font-size: 15px;
  transition: background .18s ease, color .18s ease;
}
.nav a:hover {
  background: #eef4ff;
  color: #1d4ed8;
  text-decoration: none;
}
.nav a.active {
  background: #1d4ed8;
  color: #fff;
}

.hero {
  background: linear-gradient(120deg, #1e3a8a 0%, #1d4ed8 48%, #2563eb 100%);
  color: #fff;
  padding: 72px 0 80px;
}
.hero h1 {
  font-size: 38px;
  line-height: 1.32;
  max-width: 18em;
  font-weight: 800;
}
.hero .lead {
  margin-top: 16px;
  font-size: 18px;
  color: #dbeafe;
  max-width: 48em;
}
.hero-actions {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 10px;
  border: 0;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  font-family: inherit;
  transition: background .18s ease, color .18s ease, box-shadow .18s ease;
}
.btn:hover { text-decoration: none; }
.btn-light { background: #fff; color: #1d4ed8; }
.btn-light:hover { background: #eff6ff; }
.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, .75);
}
.btn-ghost:hover { background: rgba(255, 255, 255, .12); }
.btn-solid { background: #1d4ed8; color: #fff; }
.btn-solid:hover { background: #1e40af; }
.btn.is-loading {
  pointer-events: none;
  opacity: .78;
  cursor: wait;
}
.btn.is-loading::after {
  content: "";
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

.sec { padding: 64px 0; background: #ffffff; }
.sec.tint { background: #f5f8fd; }
.sec h2 {
  font-size: 28px;
  font-weight: 800;
  color: #12305a;
  margin-bottom: 12px;
}
.sec .intro {
  color: #51657e;
  margin-bottom: 22px;
  max-width: 54em;
}
.sec p { color: #51657e; margin-bottom: 12px; }
.sec ul, .sec ol { padding-left: 22px; color: #51657e; margin-bottom: 14px; }
.sec li { margin-bottom: 6px; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card {
  background: #fff;
  border: 1px solid #e2e8f4;
  border-radius: 14px;
  padding: 22px;
}
.card h3 {
  font-size: 18px;
  margin: 0 0 10px;
  color: #12305a;
}
.card p { color: #51657e; font-size: 15px; margin-bottom: 10px; }
.card p:last-child { margin-bottom: 0; }
.tile {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: #e8effc;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  color: #1d4ed8;
  font-weight: 800;
}

.stats {
  background: #12305a;
  color: #fff;
  border-radius: 16px;
  padding: 36px 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  text-align: center;
  margin: 22px 0;
}
.stats b { display: block; font-size: 30px; color: #93c5fd; }
.stats span { color: #c7d7ef; font-size: 14px; }

.quote {
  background: #fff;
  border: 1px solid #e2e8f4;
  border-radius: 14px;
  padding: 22px;
}
.quote p { color: #3d4f66; margin-bottom: 10px; }
.who {
  margin-top: 8px;
  font-size: 14px;
  color: #12305a;
  font-weight: 700;
}
.who em {
  display: block;
  font-style: normal;
  color: #7a8ba3;
  font-weight: 400;
}

table.cmp { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; }
.cmp th, .cmp td {
  padding: 13px 14px;
  border-bottom: 1px solid #e8eef7;
  text-align: left;
  font-size: 15px;
}
.cmp thead th { background: #1d4ed8; color: #fff; }
.cmp tbody tr:nth-child(even) { background: #f5f8fd; }

.faq-item {
  background: #fff;
  border: 1px solid #e2e8f4;
  border-radius: 12px;
  padding: 18px 20px;
  margin-bottom: 12px;
}
.faq-item h3 {
  font-size: 17px;
  color: #12305a;
  margin-bottom: 8px;
}
.faq-item p { color: #51657e; margin-bottom: 8px; }
.faq-item p:last-child { margin-bottom: 0; }

.steps { counter-reset: s; }
.step {
  position: relative;
  padding: 18px 18px 18px 70px;
  background: #fff;
  border: 1px solid #e2e8f4;
  border-radius: 12px;
  margin-bottom: 12px;
}
.step::before {
  counter-increment: s;
  content: counter(s);
  position: absolute;
  left: 18px;
  top: 18px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #1d4ed8;
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step h3 { font-size: 18px; color: #12305a; margin-bottom: 8px; }
.step p { margin-bottom: 8px; }
.step p:last-child { margin-bottom: 0; }

.cta-box {
  background: linear-gradient(120deg, #1e3a8a, #2563eb);
  color: #fff;
  border-radius: 16px;
  padding: 28px 24px;
  margin-top: 20px;
}
.cta-box p { color: #dbeafe; margin-bottom: 16px; }

.article { max-width: 820px; margin: 0 auto; }
.article h2 { margin: 0 0 12px; }
.article h3 {
  font-size: 19px;
  color: #1e3a5f;
  margin: 22px 0 8px;
}
.article p { color: #3d4f66; margin-bottom: 14px; }
.article ul, .article ol { padding-left: 22px; color: #3d4f66; margin-bottom: 14px; }
.article li { margin-bottom: 6px; }

.req { width: 100%; border-collapse: collapse; background: #fff; }
.req th, .req td {
  padding: 12px 14px;
  border: 1px solid #e2e8f4;
  text-align: left;
  font-size: 15px;
}
.req thead th { background: #1d4ed8; color: #fff; }

.site-footer {
  background: #12305a;
  color: #b7c7dc;
  padding: 40px 0 28px;
}
.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 24px;
  margin-bottom: 22px;
}
.site-footer h4 { color: #fff; margin-bottom: 10px; }
.site-footer p { font-size: 14px; }
.site-footer a {
  color: #b7c7dc;
  display: block;
  margin-bottom: 7px;
  font-size: 14px;
}
.site-footer a:hover { color: #fff; }
.foot-note {
  border-top: 1px solid #2a4570;
  padding-top: 16px;
  font-size: 13px;
}
.foot-note p { margin-bottom: 6px; }

@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 900px) {
  .grid3, .grid4, .stats, .foot-grid, .grid2 { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 28px; }
}
@media (max-width: 560px) {
  .grid3, .grid4, .stats, .foot-grid, .grid2 { grid-template-columns: 1fr; }
  .header-row {
    height: auto;
    padding: 10px 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}