:root {
  --paper: #f8f5e9;
  --paper-deep: #e8efe2;
  --ink: #183b2c;
  --muted: #5c6e63;
  --green: #17633f;
  --green-bright: #2fac71;
  --line: rgba(24, 59, 44, .14);
  --panel: rgba(255, 255, 250, .76);
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(70rem 46rem at 92% -8%, rgba(156, 195, 161, .42), transparent 58%),
    linear-gradient(180deg, var(--paper), var(--paper-deep));
  font-family: "Avenir Next", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  line-height: 1.75;
  min-height: 100vh;
}

a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1080px, calc(100% - 40px)); margin-inline: auto; }
.contours {
  position: fixed; inset: 0; pointer-events: none; opacity: .28;
  background-image:
    repeating-radial-gradient(ellipse at 96% 14%, transparent 0 42px, rgba(46, 91, 65, .13) 43px 45px, transparent 46px 72px);
  mask-image: linear-gradient(to bottom, #000, transparent 52%);
}

.site-header {
  position: relative; z-index: 1; display: flex; align-items: center;
  justify-content: space-between; gap: 24px; padding-block: 28px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand img { border-radius: 13px; box-shadow: 0 8px 24px rgba(23, 99, 63, .18); }
nav { display: flex; gap: 24px; }
nav a { color: var(--muted); font-size: 14px; font-weight: 600; }
nav a.active, nav a:hover { color: var(--green); }

.hero { position: relative; z-index: 1; padding-block: 100px 86px; max-width: 900px; }
.eyebrow { color: var(--green); font-size: 13px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
h1, h2, h3 { font-family: "Songti SC", "STSong", serif; line-height: 1.2; }
.hero h1, .legal h1 { margin: 12px 0 24px; font-size: clamp(42px, 8vw, 60px); letter-spacing: -.045em; }
.lead { max-width: 720px; color: var(--muted); font-size: clamp(17px, 2.4vw, 22px); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 50px; padding: 0 22px; border-radius: 999px; font-weight: 700; }
.button:hover { text-decoration: none; transform: translateY(-1px); }
.button.primary { color: white; background: var(--green); box-shadow: 0 12px 30px rgba(23, 99, 63, .24); }
.button.secondary { color: var(--green); border: 1px solid var(--line); background: rgba(255, 255, 250, .6); }

.feature-grid { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; padding-bottom: 90px; }
.feature { min-height: 245px; padding: 32px; border: 1px solid var(--line); border-radius: 28px; background: var(--panel); backdrop-filter: blur(14px); }
.feature-wide { grid-column: span 2; min-height: 220px; }
.feature .index { color: var(--green-bright); font: 700 13px/1 "Avenir Next", sans-serif; letter-spacing: .15em; }
.feature h2 { margin: 32px 0 12px; font-size: clamp(25px, 3.4vw, 38px); }
.feature p { max-width: 760px; margin: 0; color: var(--muted); }

.legal { position: relative; z-index: 1; max-width: 850px; padding-block: 72px 100px; }
.legal h1 { font-size: clamp(40px, 7vw, 72px); }
.legal section { padding-block: 24px; border-top: 1px solid var(--line); }
.legal section:first-of-type { margin-top: 56px; }
.legal h2 { margin: 0 0 10px; font-size: 28px; }
.legal h3 { margin: 28px 0 8px; font-size: 21px; }
.legal p { color: var(--muted); }
.updated { font-size: 14px; }
.support-card { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin: 48px 0; padding: 28px; border: 1px solid var(--line); border-radius: 24px; background: var(--panel); }
.support-card span { display: block; color: var(--muted); font-size: 13px; }
.support-card strong { display: block; margin-top: 4px; font-size: clamp(16px, 2.5vw, 22px); }

.site-footer { position: relative; z-index: 1; display: flex; justify-content: space-between; gap: 20px; padding-block: 28px 48px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.site-footer div { display: flex; flex-wrap: wrap; gap: 18px; }

@media (max-width: 680px) {
  .site-header { align-items: flex-start; }
  nav { gap: 14px; padding-top: 12px; }
  .brand span { display: none; }
  .hero { padding-block: 66px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-wide { grid-column: auto; }
  .support-card { align-items: stretch; flex-direction: column; }
  .site-footer { flex-direction: column; }
}