:root {
  --bg: #f7fafc;
  --bg-soft: #f3f7fa;
  --surface: #ffffff;
  --surface-soft: #fafcfe;
  --section: #eef4f8;
  --section-2: #eaf2f7;
  --line: #d8e3ea;
  --line-soft: #e2eaf0;
  --title: #102a43;
  --title-soft: #16384f;
  --text: #5f7387;
  --muted: #6b7c8f;
  --brand: #6f8fa8;
  --brand-2: #5f82a0;
  --deep: #17364d;
  --deep-2: #1e435e;
  --accent: #7fc6cc;
  --accent-2: #6fb8c2;
  --shadow: 0 18px 48px rgba(16, 42, 67, 0.08);
  --shadow-soft: 0 10px 30px rgba(16, 42, 67, 0.06);
  --radius-lg: 28px;
  --radius: 22px;
  --radius-sm: 16px;
  --container: 1180px;
  --header-height: 76px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(127, 198, 204, 0.16), transparent 34%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 48%, #ffffff 100%);
  color: var(--text);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    sans-serif;
  line-height: 1.75;
}

body.is-menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

button,
input,
textarea {
  font: inherit;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  color: var(--title);
  line-height: 1.16;
  letter-spacing: 0;
}

h1 {
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: clamp(42px, 6vw, 82px);
  font-weight: 700;
}

h2 {
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 700;
}

h3 {
  font-size: 20px;
  font-weight: 700;
}

p {
  margin-bottom: 0;
}

::selection {
  background: rgba(127, 198, 204, 0.28);
  color: var(--title);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}