:root {
  --sndb-ink-strong: #0e2238;
  --sndb-ink-soft: #486174;
  --sndb-line: rgba(13, 59, 102, 0.12);
  --sndb-surface: rgba(255, 255, 255, 0.88);
  --sndb-surface-strong: #ffffff;
  --sndb-brand-deep: #0d3b66;
  --sndb-brand-mid: #146c94;
  --sndb-brand-bright: #18a058;
  --sndb-shadow: 0 24px 54px rgba(13, 59, 102, 0.09);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--sndb-ink-strong);
  background:
    radial-gradient(circle at top left, rgba(24, 160, 88, 0.12), transparent 28%),
    radial-gradient(circle at top right, rgba(13, 59, 102, 0.12), transparent 34%),
    linear-gradient(180deg, #f8fbff 0%, #edf5f9 100%);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

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

a:hover {
  color: var(--sndb-brand-bright);
}

code,
pre {
  font-family: "Cascadia Code", Consolas, monospace;
}

pre {
  overflow-x: auto;
  padding: 18px;
  border-radius: 18px;
  background: #0e2238;
  color: #f8fbff;
}

code {
  padding: 0.12rem 0.35rem;
  border-radius: 8px;
  background: rgba(13, 59, 102, 0.08);
}

pre code {
  padding: 0;
  background: transparent;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  overflow: hidden;
  border-radius: 18px;
  background: var(--sndb-surface-strong);
  box-shadow: 0 16px 32px rgba(13, 59, 102, 0.06);
}

th,
td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid rgba(13, 59, 102, 0.08);
}

th {
  color: var(--sndb-brand-deep);
  background: rgba(13, 59, 102, 0.04);
}

blockquote {
  margin: 24px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--sndb-brand-bright);
  border-radius: 16px;
  background: rgba(24, 160, 88, 0.08);
  color: var(--sndb-ink-soft);
}

.site-shell {
  max-width: 1400px;
  margin: 0 auto;
  padding: 28px clamp(20px, 4vw, 48px) 48px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px;
  border: 1px solid var(--sndb-line);
  border-radius: 28px;
  background: rgba(248, 251, 255, 0.82);
  box-shadow: var(--sndb-shadow);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--sndb-ink-strong);
}

.brand-mark {
  width: 54px;
  height: 54px;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 16px 30px rgba(13, 59, 102, 0.16);
  flex: none;
}

.brand-mark svg {
  width: 100%;
  height: 100%;
  display: block;
}

.brand-copy {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
}

.brand-copy strong {
  font-size: 1.2rem;
  letter-spacing: 0.03em;
}

.brand-copy span:last-child {
  color: var(--sndb-ink-soft);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.top-nav,
.header-actions {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.top-nav {
  flex-wrap: wrap;
}

.top-nav a,
.ghost-link,
.side-nav a {
  transition: transform 160ms ease, color 160ms ease, background 160ms ease;
}

.top-nav a,
.ghost-link {
  padding: 10px 14px;
  border-radius: 999px;
  color: #486174;
}

.top-nav a:hover,
.ghost-link:hover,
.side-nav a:hover {
  transform: translateY(-1px);
  color: var(--sndb-ink-strong);
}

.ghost-link {
  background: rgba(13, 59, 102, 0.06);
  color: var(--sndb-brand-deep);
  font-weight: 600;
}

.page-shell {
  display: grid;
  grid-template-columns: minmax(220px, 260px) minmax(0, 1fr);
  gap: 24px;
  margin-top: 24px;
  align-items: start;
}

.side-nav,
.content-card {
  border: 1px solid var(--sndb-line);
  border-radius: 28px;
  background: var(--sndb-surface);
  box-shadow: var(--sndb-shadow);
  backdrop-filter: blur(14px);
}

.side-nav {
  position: sticky;
  top: 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px;
}

.side-nav-label,
.eyebrow {
  margin: 0 0 8px;
  color: var(--sndb-brand-mid);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.side-nav a {
  display: block;
  padding: 11px 12px;
  border-radius: 14px;
  color: #486174;
}

.side-nav a:hover {
  background: rgba(13, 59, 102, 0.05);
}

.content-card {
  padding: clamp(28px, 4vw, 44px);
}

.page-head h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 3.8rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.page-description {
  margin: 16px 0 0;
  max-width: 62ch;
  color: #486174;
  font-size: 1.03rem;
}

.page-content h2,
.page-content h3 {
  margin-top: 36px;
  margin-bottom: 12px;
  line-height: 1.18;
}

.page-content h2 {
  font-size: 1.7rem;
}

.page-content h3 {
  font-size: 1.2rem;
}

.page-content p,
.page-content ul,
.page-content ol {
  color: #486174;
}

.page-content ul,
.page-content ol {
  padding-left: 1.2rem;
}

.page-content li + li {
  margin-top: 8px;
}

.callout-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 28px 0;
}

.callout-card {
  padding: 20px;
  border: 1px solid rgba(13, 59, 102, 0.08);
  border-radius: 22px;
  background: #ffffff;
  box-shadow: 0 16px 34px rgba(13, 59, 102, 0.05);
}

.callout-card strong {
  display: block;
  font-size: 1rem;
}

.callout-card p {
  margin: 10px 0 0;
}

.hero-link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border-radius: 999px;
  font-weight: 600;
}

.hero-link-primary {
  background: linear-gradient(135deg, #0d3b66 0%, #18a058 100%);
  color: #f8fbff;
  box-shadow: 0 14px 28px rgba(13, 59, 102, 0.18);
}

.hero-link-secondary {
  background: rgba(13, 59, 102, 0.06);
  color: var(--sndb-ink-strong);
}

@media (max-width: 1024px) {
  .page-shell,
  .callout-grid {
    grid-template-columns: 1fr;
  }

  .side-nav {
    position: static;
  }
}

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

  .top-nav,
  .header-actions {
    flex-wrap: wrap;
  }
}