:root {
  --bg-top: #f3efe7;
  --bg-bottom: #dbe5ea;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(248, 251, 253, 0.92);
  --line: rgba(31, 52, 70, 0.12);
  --line-strong: rgba(31, 52, 70, 0.18);
  --text-main: #1f2b37;
  --text-soft: #506171;
  --accent: #2a5b7c;
  --accent-soft: #d5e6f0;
  --shadow: 0 24px 60px rgba(39, 63, 82, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text-main);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.85), transparent 36%),
    linear-gradient(180deg, var(--bg-top) 0%, #eef3f5 42%, var(--bg-bottom) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(42, 91, 124, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 91, 124, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.32), transparent 90%);
}

.page-shell {
  position: relative;
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  padding: 72px 0 32px;
}

.hero,
.intro-card,
.content-card,
.site-footer {
  backdrop-filter: blur(14px);
}

.hero {
  padding: 56px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background: linear-gradient(140deg, var(--surface-strong), rgba(255, 255, 255, 0.58));
  box-shadow: var(--shadow);
}

.eyebrow,
.section-tag {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  font-weight: 700;
  letter-spacing: 0.02em;
}

h1 {
  max-width: 9ch;
  font-size: clamp(2.8rem, 6vw, 5.2rem);
  line-height: 1.08;
}

.hero-copy {
  max-width: 42rem;
  margin: 24px 0 0;
  color: var(--text-soft);
  font-size: 1.06rem;
  line-height: 1.9;
}

main {
  margin-top: 28px;
}

.intro-card {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 28px;
  align-items: end;
  padding: 34px 36px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 16px 40px rgba(33, 55, 76, 0.08);
}

.intro-card h2 {
  font-size: clamp(1.65rem, 3vw, 2.3rem);
}

.intro-card p:last-child {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.9;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.content-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: 0 16px 34px rgba(33, 55, 76, 0.08);
}

.content-card h3 {
  font-size: 1.35rem;
}

.content-card p {
  margin: 14px 0 0;
  color: var(--text-soft);
  line-height: 1.85;
}

.accent-card {
  background:
    linear-gradient(180deg, rgba(213, 230, 240, 0.76), rgba(255, 255, 255, 0.82));
  border-color: var(--line-strong);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  padding: 20px 24px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.68);
}

.site-footer p {
  margin: 0;
  color: var(--text-soft);
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  text-decoration: underline;
}

@media (max-width: 860px) {
  .page-shell {
    width: min(100% - 20px, 1100px);
    padding-top: 20px;
  }

  .hero {
    padding: 34px 24px;
    border-radius: 24px;
  }

  .intro-card {
    grid-template-columns: 1fr;
    padding: 28px 24px;
    border-radius: 22px;
  }

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

  .content-card,
  .site-footer {
    border-radius: 20px;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  body::before {
    background-size: 22px 22px;
  }

  .page-shell {
    width: calc(100% - 16px);
    padding-bottom: 16px;
  }

  .hero-copy,
  .intro-card p:last-child,
  .content-card p {
    font-size: 0.98rem;
    line-height: 1.8;
  }
}