:root {
  color-scheme: light;
  --bg: #eef4fb;
  --paper: rgba(255, 255, 255, 0.94);
  --paper-strong: #ffffff;
  --text: #102033;
  --muted: #516b86;
  --line: rgba(148, 163, 184, 0.22);
  --accent: #1d4ed8;
  --accent-soft: rgba(29, 78, 216, 0.1);
  --shadow: 0 24px 50px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background:
    radial-gradient(circle at top left, rgba(147, 197, 253, 0.24), transparent 30%),
    radial-gradient(circle at top right, rgba(186, 230, 253, 0.22), transparent 28%),
    linear-gradient(180deg, #f5f8fc 0%, var(--bg) 48%, #e8f1fb 100%);
  color: var(--text);
  font-family: 'IBM Plex Sans', 'PingFang SC', 'Source Han Sans SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.75;
}

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

a:hover {
  text-decoration: underline;
}

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 20px 56px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--muted);
}

.topbar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero,
.section,
.faq-item,
.feature-card,
.page-grid__side {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero {
  padding: 32px;
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.08;
}

.lead {
  margin: 0;
  max-width: 760px;
  font-size: 16px;
  color: var(--muted);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--paper-strong);
  font-size: 13px;
  color: var(--text);
}

.chip--active {
  background: var(--accent-soft);
  border-color: rgba(29, 78, 216, 0.16);
  color: var(--accent);
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.9fr);
  gap: 18px;
}

.page-grid__main {
  display: grid;
  gap: 18px;
}

.page-grid__side {
  padding: 22px;
  height: fit-content;
}

.section {
  padding: 24px;
}

.section h2,
.page-grid__side h2 {
  margin: 0 0 10px;
  font-size: 24px;
  line-height: 1.25;
}

.section p,
.page-grid__side p,
.section li,
.faq-item p,
.feature-card p {
  color: var(--muted);
}

.section ul,
.section ol,
.faq-item ul {
  margin: 10px 0 0;
  padding-left: 20px;
}

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

.feature-card {
  padding: 18px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.cta-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
}

.cta--secondary {
  background: var(--paper-strong);
  border: 1px solid var(--line);
  color: var(--text);
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  padding: 18px;
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.footer {
  margin-top: 24px;
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 900px) {
  .page-grid {
    grid-template-columns: 1fr;
  }

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

  .hero,
  .section,
  .page-grid__side {
    padding: 20px;
    border-radius: 24px;
  }
}