:root {
  --bg-top: #fff3c8;
  --bg-bottom: #eef8ff;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: rgba(255, 255, 255, 0.94);
  --text: #101114;
  --muted: #5d6472;
  --line: rgba(16, 17, 20, 0.08);
  --accent: #177df0;
  --accent-soft: rgba(23, 125, 240, 0.12);
  --shadow: 0 18px 48px rgba(69, 95, 129, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 232, 144, 0.5), transparent 32%),
    radial-gradient(circle at bottom right, rgba(126, 198, 255, 0.32), transparent 30%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

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

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

.hero {
  padding: 28px 0 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 48px;
}

.brand {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
}

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

.hero-copy {
  padding: 44px;
  border: 1px solid var(--line);
  border-radius: 36px;
  background: var(--surface);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.lead,
.page-lead,
.feature-card p,
.content-card p,
.bullet-list li {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.lead {
  max-width: 760px;
  margin: 20px 0 0;
}

.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 700;
}

.primary-button {
  background: var(--accent);
  color: #fff;
}

.secondary-button {
  color: var(--accent);
  background: var(--accent-soft);
}

main {
  padding-bottom: 56px;
}

.feature-grid {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card,
.story-card,
.content-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface-strong);
  box-shadow: var(--shadow);
}

.feature-card {
  padding: 28px;
}

.feature-card h2,
.story-card h2,
.content-card h2 {
  margin: 0 0 12px;
  font-size: 28px;
  line-height: 1.2;
}

.story-card {
  width: min(1120px, calc(100% - 32px));
  margin: 18px auto 0;
  padding: 32px;
}

.bullet-list {
  margin: 18px 0 0;
  padding-left: 20px;
}

.footer-links {
  width: min(1120px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  gap: 18px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.page-shell {
  padding: 32px 0 56px;
}

.back-link {
  display: inline-block;
  margin-bottom: 18px;
  font-weight: 700;
}

.content-card {
  margin-top: 18px;
  padding: 28px;
}

.faq-item + .faq-item {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

@media (max-width: 860px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    padding: 28px;
  }

  .topbar {
    margin-bottom: 28px;
  }
}