* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  color: #172033;
  background:
    radial-gradient(circle at 12% 12%, rgba(47, 111, 237, 0.14), transparent 28%),
    radial-gradient(circle at 86% 4%, rgba(16, 185, 129, 0.12), transparent 26%),
    linear-gradient(180deg, #f7fbff 0%, #eef4f8 100%);
  line-height: 1.7;
}

.page {
  width: min(1060px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 44px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 34px;
}

.brand {
  color: #0f172a;
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.nav a,
.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  color: #475569;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.hero {
  display: grid;
  gap: 14px;
  margin-bottom: 24px;
}

.eyebrow {
  color: #2563eb;
  font-size: 13px;
  font-weight: 800;
}

h1 {
  max-width: 780px;
  margin: 0;
  color: #0f172a;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.05;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin: 0;
  color: #475569;
  font-size: 17px;
}

.content {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 22px;
  align-items: start;
}

.summary,
.section {
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 18px 46px rgba(31, 41, 55, 0.08);
}

.summary {
  position: sticky;
  top: 18px;
  padding: 18px;
}

.summary strong {
  display: block;
  margin-bottom: 10px;
  color: #0f172a;
}

.summary a {
  display: block;
  padding: 7px 0;
  color: #475569;
  font-size: 14px;
  text-decoration: none;
}

.sections {
  display: grid;
  gap: 16px;
}

.section {
  padding: 24px;
}

h2 {
  margin: 0 0 10px;
  color: #111827;
  font-size: 22px;
  line-height: 1.25;
}

p {
  margin: 0 0 12px;
}

ul {
  margin: 0;
  padding-left: 20px;
}

li + li {
  margin-top: 8px;
}

.notice {
  border-left: 4px solid #2563eb;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(37, 99, 235, 0.08);
  color: #334155;
}

.footer {
  margin-top: 26px;
  color: #64748b;
  font-size: 13px;
}

@media (max-width: 760px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .summary {
    position: static;
  }
}