:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --surface-2: #f5f2ea;
  --text: #1c2430;
  --ink: #131a24;
  --muted: #6f7a88;
  --line: #e7e3d8;
  --primary: #0f9a86;
  --primary-2: #13b39c;
  --primary-weak: #e2f4f0;
  --accent: #f59e0b;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius: 16px;
  --radius-sm: 12px;
  --radius-pill: 999px;
  --shadow: 0 1px 2px rgba(28, 36, 48, 0.05), 0 8px 28px rgba(28, 36, 48, 0.07);
  --shadow-lg: 0 6px 16px rgba(28, 36, 48, 0.1), 0 20px 48px rgba(28, 36, 48, 0.12);
  --maxw: 1160px;
  --nav-h: 64px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  font-family: var(--serif);
  color: var(--ink);
  line-height: 1.3;
  font-weight: 800;
}

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

button,
input {
  font: inherit;
}

.container {
  width: min(100% - 44px, var(--maxw));
  margin-inline: auto;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  min-height: var(--nav-h);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-weight: 800;
  font-size: 20px;
  color: var(--ink);
}

.brand .mark,
.fbrand .mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 16px;
  box-shadow: 0 4px 12px rgba(15, 154, 134, 0.35);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: 0.15s;
}

.btn-ghost {
  background: var(--surface);
  border-color: var(--line);
  color: var(--text);
}

.btn-ghost:hover {
  background: var(--surface-2);
}

.eyebrow,
.tag {
  display: inline-block;
  color: var(--primary);
  background: var(--primary-weak);
  border-radius: var(--radius-pill);
  font-weight: 700;
}

.eyebrow {
  padding: 5px 14px;
  font-size: 13px;
}

.tag {
  padding: 3px 9px;
  font-size: 11px;
}

.section {
  padding: 42px 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 18px;
  margin-bottom: 20px;
}

.section-head h2 {
  position: relative;
  margin-bottom: 4px;
  padding-left: 14px;
  font-size: 24px;
}

.section-head h2::before {
  content: "";
  position: absolute;
  inset: 4px auto 4px 0;
  width: 5px;
  border-radius: 3px;
  background: linear-gradient(var(--primary), var(--accent));
}

.site-footer {
  margin-top: 40px;
  padding: 38px 0;
  background: var(--ink);
  color: #9aa6b4;
  border-top: 1px solid #232c3b;
}