:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --panel: #fbfaf7;
  --ink: #172033;
  --muted: #5d6675;
  --line: #dfe3ea;
  --brand: #1d5fd3;
  --brand-dark: #163f8f;
  --accent: #0b7a5a;
  --warn-bg: #fff8e4;
  --warn-line: #ebc765;
  --soft: #e8eefb;
  --shadow: 0 18px 55px rgba(23, 32, 51, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(232, 238, 251, 0.72), rgba(244, 246, 248, 0) 360px),
    var(--bg);
  color: var(--ink);
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.site-header {
  background: rgba(251, 250, 247, 0.94);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
}

.nav,
.section {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-weight: 800;
  font-size: 20px;
  text-decoration: none;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 15px;
  min-width: 0;
}

.nav-links a {
  text-decoration: none;
  white-space: nowrap;
}

.nav-links a:hover,
.card a:hover,
.text-link:hover {
  color: var(--brand);
}

.hero {
  padding: clamp(52px, 8vw, 86px) 0 42px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 32px;
  align-items: center;
}

.hero-grid > *,
.grid > *,
.spec-list > * {
  min-width: 0;
}

.eyebrow {
  color: var(--brand);
  font-weight: 800;
  margin: 0 0 10px;
}

h1,
h2,
h3 {
  letter-spacing: 0;
}

h1 {
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.08;
  margin: 0 0 18px;
}

h2 {
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.22;
  margin: 0 0 16px;
}

h3 {
  font-size: 20px;
  margin: 0 0 10px;
}

p {
  margin: 0 0 14px;
  overflow-wrap: break-word;
}

.lead {
  color: var(--muted);
  font-size: 18px;
  max-width: 760px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  text-decoration: none;
  background: var(--brand);
  color: #fff;
  font-weight: 800;
  border: 1px solid var(--brand);
}

.button.secondary {
  background: var(--soft);
  color: var(--brand-dark);
  border-color: var(--soft);
}

.button.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.trust-card,
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}

.trust-card {
  box-shadow: var(--shadow);
}

.trust-list,
.check-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.trust-list li::before,
.check-list li::before {
  content: "✓";
  color: var(--accent);
  font-weight: 800;
  margin-right: 8px;
}

.trust-list li,
.check-list li {
  overflow-wrap: anywhere;
}

.section {
  padding: 34px 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.section-head p {
  color: var(--muted);
  max-width: 620px;
}

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

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

.card a,
.text-link {
  color: var(--brand);
  font-weight: 800;
  text-decoration: none;
}

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

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 12px;
  background: rgba(251, 250, 247, 0.8);
  color: var(--muted);
  font-size: 14px;
  max-width: 100%;
  white-space: normal;
}

.notice {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: 8px;
  padding: 18px;
}

.story-band {
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.copy-block {
  max-width: 820px;
}

.copy-block + .copy-block {
  margin-top: 24px;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.feature {
  border-left: 3px solid var(--brand);
  padding: 4px 0 4px 16px;
}

.feature strong {
  display: block;
}

.link-list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.link-list a {
  color: var(--brand);
  font-weight: 800;
  text-decoration: none;
}

.language-switch {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

.language-switch a {
  color: var(--brand);
  font-weight: 800;
  text-decoration: none;
}

.page {
  padding: 48px 0;
}

.content {
  max-width: 920px;
}

.content h2 {
  margin-top: 28px;
}

.content ul,
.content ol {
  padding-left: 22px;
}

.spec-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}

.spec {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.55);
}

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

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef2f7;
}

tr:last-child td {
  border-bottom: 0;
}

.footer {
  margin-top: 48px;
  padding: 28px 0;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 10px 14px;
  }

  .hero-grid,
  .grid,
  .grid.two,
  .spec-list,
  .feature-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .section-head {
    align-items: start;
    flex-direction: column;
  }
}