:root {
  color-scheme: light;
  --ink: #10213f;
  --muted: #60708d;
  --line: #dfe7f2;
  --soft: #f4f7fc;
  --brand: #315efb;
  --brand-dark: #2448c8;
  --cyan: #10a9c9;
  --success: #16845b;
  --warning-bg: #fff8e8;
  --warning-line: #f1d88d;
  --card-shadow: 0 18px 50px rgba(26, 52, 104, 0.09);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #ffffff;
  font-size: 16px;
  line-height: 1.75;
}

a {
  color: var(--brand-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(223, 231, 242, 0.9);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--brand), var(--cyan));
  box-shadow: 0 8px 18px rgba(49, 94, 251, 0.24);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 6px 22px;
  font-size: 14px;
}

.nav a {
  color: #445574;
}

.hero {
  overflow: hidden;
  position: relative;
  padding: 100px 0 84px;
  background:
    radial-gradient(circle at 82% 15%, rgba(16, 169, 201, 0.14), transparent 27%),
    radial-gradient(circle at 12% 5%, rgba(49, 94, 251, 0.13), transparent 31%),
    linear-gradient(180deg, #f8faff 0%, #ffffff 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 64px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--brand-dark);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.3;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(36px, 5vw, 60px);
  letter-spacing: -0.035em;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(27px, 3vw, 38px);
  letter-spacing: -0.02em;
}

h3 {
  margin-bottom: 10px;
  font-size: 19px;
}

.hero-copy {
  max-width: 680px;
  margin: 0;
  color: #4f607e;
  font-size: 18px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.badge {
  padding: 7px 12px;
  border: 1px solid #d8e3ff;
  border-radius: 999px;
  color: #34509c;
  background: #f7f9ff;
  font-size: 13px;
  font-weight: 700;
}

.hero-card {
  padding: 30px;
  border: 1px solid rgba(217, 227, 244, 0.92);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--card-shadow);
}

.hero-card-title {
  margin: 0 0 18px;
  color: #64728b;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.status-line {
  display: flex;
  gap: 13px;
  align-items: flex-start;
  padding: 15px 0;
  border-top: 1px solid var(--line);
}

.status-line:first-of-type {
  border-top: 0;
}

.status-dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 5px rgba(22, 132, 91, 0.11);
}

.status-line strong,
.status-line span {
  display: block;
}

.status-line span {
  margin-top: 2px;
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 78px 0;
}

.section.soft {
  background: var(--soft);
}

.section-lead {
  max-width: 760px;
  margin: -6px 0 34px;
  color: var(--muted);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #ffffff;
  box-shadow: 0 10px 32px rgba(29, 54, 104, 0.045);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.card-number {
  display: inline-grid;
  width: 36px;
  height: 36px;
  place-items: center;
  margin-bottom: 18px;
  border-radius: 10px;
  color: var(--brand-dark);
  background: #edf2ff;
  font-size: 13px;
  font-weight: 800;
}

.boundary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.boundary .card {
  min-height: 220px;
}

.check-list {
  padding: 0;
  margin: 14px 0 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 6px 0 6px 28px;
  color: #4f607e;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 6px;
  color: var(--success);
  font-weight: 800;
}

.notice {
  padding: 18px 20px;
  border: 1px solid var(--warning-line);
  border-radius: 14px;
  color: #765b18;
  background: var(--warning-bg);
  font-size: 14px;
}

.document-hero {
  padding: 70px 0 54px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #f6f8fd 0%, #ffffff 100%);
}

.document-hero h1 {
  margin-bottom: 12px;
  font-size: clamp(34px, 4.5vw, 48px);
}

.document-meta {
  margin: 0;
  color: var(--muted);
}

.document {
  width: min(860px, calc(100% - 40px));
  margin: 0 auto;
  padding: 60px 0 86px;
}

.document section + section {
  margin-top: 46px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}

.document h2 {
  font-size: 26px;
}

.document p,
.document li {
  color: #425371;
}

.document ul,
.document ol {
  padding-left: 24px;
}

.definition-list {
  display: grid;
  gap: 14px;
  margin: 22px 0;
}

.definition-item {
  padding: 18px 20px;
  border-left: 4px solid #b8c9fb;
  border-radius: 0 12px 12px 0;
  background: #f7f9fd;
}

.definition-item strong {
  display: block;
  margin-bottom: 4px;
}

.callback-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 20px;
  background:
    radial-gradient(circle at 50% 5%, rgba(49, 94, 251, 0.15), transparent 40%),
    #f5f7fc;
}

.callback-card {
  width: min(560px, 100%);
  padding: 46px;
  border: 1px solid var(--line);
  border-radius: 24px;
  text-align: center;
  background: #ffffff;
  box-shadow: var(--card-shadow);
}

.callback-icon {
  width: 68px;
  height: 68px;
  display: grid;
  place-items: center;
  margin: 0 auto 24px;
  border-radius: 20px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--brand), var(--cyan));
  font-size: 30px;
  font-weight: 800;
}

.callback-card h1 {
  margin-bottom: 14px;
  font-size: 28px;
}

.callback-card p {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--line);
  color: #6c7890;
  background: #fafbfd;
  font-size: 13px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

@media (max-width: 820px) {
  .header-inner {
    padding: 14px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    justify-content: flex-start;
  }

  .hero {
    padding: 72px 0 60px;
  }

  .hero-grid,
  .boundary {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 560px) {
  .container,
  .document {
    width: min(100% - 28px, 1120px);
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 58px 0;
  }

  .hero-card,
  .callback-card {
    padding: 28px 22px;
  }
}