:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-alt: #eef3f8;
  --text: #1b2430;
  --muted: #5f6b7a;
  --line: #d8e1ea;
  --primary: #0f4c81;
  --primary-deep: #0b365b;
  --accent: #1f7a8c;
  --success: #287d5c;
  --shadow: 0 18px 40px rgba(15, 76, 129, 0.08);
  --radius: 18px;
  --radius-sm: 12px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(31, 122, 140, 0.08), transparent 28%),
    radial-gradient(circle at top right, rgba(15, 76, 129, 0.08), transparent 24%),
    linear-gradient(180deg, #f8fbfd 0%, #f3f6fb 100%);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(248, 251, 253, 0.88);
  border-bottom: 1px solid rgba(216, 225, 234, 0.8);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 24px;
}

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

.brand-mark {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-sub {
  color: var(--muted);
  font-size: 0.84rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 0.96rem;
}

.nav a:hover,
.nav a.active {
  color: var(--primary);
}

.header-actions {
  display: flex;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.96rem;
  transition: 0.2s ease;
  cursor: pointer;
}

.button-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: var(--shadow);
}

.button-primary:hover {
  transform: translateY(-1px);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--line);
  color: var(--primary-deep);
}

.hero {
  padding: 76px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: stretch;
}

.hero-copy,
.hero-panel,
.panel,
.card,
.section-shell,
.footer-panel {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(216, 225, 234, 0.92);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 44px;
}

.eyebrow {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(15, 76, 129, 0.08);
  color: var(--primary);
  font-size: 0.84rem;
  margin-bottom: 18px;
}

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

h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  margin-bottom: 14px;
}

h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.lead {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 720px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.hero-meta strong {
  display: block;
  font-size: 1.15rem;
}

.hero-meta span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 6px;
}

.hero-panel {
  padding: 28px;
  background:
    linear-gradient(180deg, rgba(11, 54, 91, 0.94), rgba(15, 76, 129, 0.88)),
    linear-gradient(135deg, rgba(31, 122, 140, 0.2), transparent);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.hero-panel p,
.hero-panel li {
  color: rgba(255, 255, 255, 0.82);
}

.hero-panel ul {
  margin: 18px 0 0;
  padding-left: 18px;
}

.code-shell {
  margin-top: 24px;
  padding: 18px;
  border-radius: var(--radius-sm);
  background: rgba(8, 25, 43, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.12);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.92rem;
  overflow: auto;
}

.section {
  padding: 24px 0 40px;
}

.section-shell {
  padding: 34px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.section-head p {
  margin: 0;
  max-width: 720px;
  color: var(--muted);
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 18px;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  padding: 24px;
}

.card p,
.card li,
.section-shell li {
  margin: 0;
  color: var(--muted);
}

.card ul,
.section-shell ul,
.section-shell ol {
  margin: 0;
  padding-left: 18px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--surface-alt);
  color: var(--primary-deep);
  font-size: 0.9rem;
}

.page-hero {
  padding: 64px 0 26px;
}

.page-hero .section-shell {
  padding: 42px;
}

.meta-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.meta-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.meta-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.meta-label {
  color: var(--muted);
}

.notice {
  margin-top: 16px;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  background: rgba(40, 125, 92, 0.08);
  color: var(--success);
  border: 1px solid rgba(40, 125, 92, 0.18);
}

.footer {
  padding: 20px 0 48px;
}

.footer-panel {
  padding: 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
}

.footer-meta {
  display: grid;
  gap: 10px;
  color: var(--muted);
}

.footer-meta strong {
  color: var(--text);
}

.legal-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.muted {
  color: var(--muted);
}

.list-tight {
  display: grid;
  gap: 10px;
}

.table-like {
  display: grid;
  gap: 12px;
}

.table-row {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fbfdff;
}

.table-row strong {
  display: block;
  margin-bottom: 6px;
}

@media (max-width: 980px) {
  .header-inner,
  .section-head,
  .footer-grid,
  .hero-grid {
    grid-template-columns: 1fr;
    display: grid;
  }

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

  .grid-4,
  .grid-3,
  .grid-2,
  .hero-meta {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(var(--max), calc(100% - 28px));
  }

  .hero-copy,
  .hero-panel,
  .section-shell,
  .footer-panel,
  .card {
    padding: 22px;
  }

  .header-inner {
    min-height: auto;
    padding: 14px 0;
  }

  .meta-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}