:root {
  --bg: #f4f8ff;
  --bg-soft: #ebf2ff;
  --text: #142643;
  --muted: #4e607d;
  --line: rgba(20, 38, 67, 0.16);
  --brand: #0f3dff;
  --brand-2: #1ea8dd;
  --chip: #e6efff;
  --card: #ffffff;
  --shadow: 0 14px 36px rgba(15, 61, 255, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI Variable", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 92% 6%, rgba(30, 168, 221, 0.2), transparent 24%),
    radial-gradient(circle at 4% 92%, rgba(15, 61, 255, 0.18), transparent 30%),
    var(--bg);
  line-height: 1.7;
}

.container {
  width: min(900px, calc(100% - 2rem));
  margin: 0 auto;
}

.page-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: #ffffffcf;
  backdrop-filter: blur(10px);
}

.page-header .container {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  color: var(--brand);
}

.brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.back-link {
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  background: #fff;
  transition: border-color 0.2s ease;
}

.back-link:hover {
  border-color: rgba(15, 61, 255, 0.4);
}

main {
  padding: 2.2rem 0 3.2rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  line-height: 1.2;
}

h2 {
  margin-top: 1.9rem;
  margin-bottom: 0.4rem;
  font-size: 1.2rem;
}

p,
li {
  color: var(--muted);
}

a {
  color: #0b46d3;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: #0d4ceb;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.subtitle {
  margin: 0.65rem 0 0;
  font-size: 1.05rem;
}

.meta-row {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid rgba(15, 61, 255, 0.18);
  background: var(--chip);
  color: #234586;
  padding: 0.2rem 0.62rem;
  font-size: 0.86rem;
  font-weight: 600;
}

.section-grid {
  margin-top: 1rem;
  display: grid;
  gap: 0.9rem;
}

.section-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
  background: linear-gradient(160deg, #ffffff, #f6f9ff 65%);
}

.section-item h3 {
  margin: 0;
  font-size: 1.02rem;
}

.section-item p,
.section-item ul {
  margin: 0.55rem 0 0;
}

.link-grid {
  margin-top: 0.7rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.link-card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7rem 0.8rem;
  background: #fff;
}

.link-card strong {
  display: block;
  color: #1f3565;
}

.notice {
  margin-top: 1rem;
  border-left: 3px solid #f59f00;
  padding: 0.5rem 0 0.5rem 0.85rem;
  color: #5b5c67;
  background: rgba(245, 159, 0, 0.08);
  border-radius: 10px;
}

.timeline {
  margin-top: 0.7rem;
  display: grid;
  gap: 0.7rem;
}

.timeline .item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.8rem;
}

.timeline .item h3 {
  margin: 0;
  font-size: 1rem;
}

.timeline .item p {
  margin: 0.45rem 0 0;
}

footer {
  border-top: 1px solid var(--line);
  padding: 1rem 0 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 760px) {
  .page-header .container {
    min-height: 64px;
  }

  .back-link {
    font-size: 0.88rem;
    padding: 0.3rem 0.62rem;
  }

  .card {
    padding: 1rem;
  }

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