:root {
  --bg: #ffffff;
  --surface: #f6f8f6;
  --ink: #17211a;
  --muted: #5b6b60;
  --primary: #1f9d4d;
  --primary-strong: #17803e;
  --accent: #32c357;
  --line: #e2e8e3;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(23, 33, 26, 0.05), 0 12px 32px -18px rgba(23, 33, 26, 0.28);
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--bg);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary-strong); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

.wrap { width: min(100% - 40px, 1040px); margin: 0 auto; }

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }

.site-header nav { margin-left: auto; display: flex; gap: 4px; }
.site-header nav a {
  padding: 8px 12px;
  color: var(--muted);
  font-size: 15px;
  border-radius: 8px;
}
.site-header nav a:hover { color: var(--ink); background: var(--surface); text-decoration: none; }

/* ---------- hero ---------- */

.hero { padding: 72px 0 40px; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: 48px; align-items: center; }

.kicker {
  margin: 0 0 14px;
  color: var(--primary-strong);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

h1 {
  margin: 0;
  font-size: 44px;
  line-height: 1.18;
  font-weight: 750;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.lede {
  margin: 20px 0 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: 18px;
  text-wrap: pretty;
}

.hero-actions { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 12px; }

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  border: 1px solid transparent;
}
.button:hover { text-decoration: none; }
.button--primary { background: var(--primary); color: #fff; }
.button--primary:hover { background: var(--primary-strong); }
.button--ghost { border-color: var(--line); color: var(--ink); background: #fff; }
.button--ghost:hover { background: var(--surface); }

.hero-art {
  display: flex;
  justify-content: center;
}
.hero-art img {
  width: min(100%, 320px);
  border-radius: 28%;
  box-shadow: var(--shadow);
}

/* ---------- sections ---------- */

section.block { padding: 56px 0; }
section.block.alt { background: var(--surface); }

h2 {
  margin: 0;
  font-size: 30px;
  line-height: 1.3;
  font-weight: 720;
  letter-spacing: -0.01em;
}

.section-lede { margin: 12px 0 0; max-width: 62ch; color: var(--muted); }

.features {
  margin-top: 36px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.feature {
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.feature h3 { margin: 0; font-size: 17px; line-height: 1.4; }
.feature p { margin: 8px 0 0; color: var(--muted); font-size: 15px; line-height: 1.65; }

.steps { margin: 36px 0 0; padding: 0; list-style: none; counter-reset: step; display: grid; gap: 16px; }
.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.steps li::before {
  content: counter(step);
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--surface);
  color: var(--primary-strong);
  font-weight: 700;
  grid-row: span 2;
}
.steps h3 { margin: 0; font-size: 17px; }
.steps p { margin: 4px 0 0; color: var(--muted); font-size: 15px; }

/* ---------- legal / docs pages ---------- */

.doc { padding: 56px 0 80px; }
.doc .wrap { max-width: 820px; }
.doc h1 { font-size: 36px; }
.doc .effective { margin: 10px 0 0; color: var(--muted); font-size: 15px; }
.doc h2 { margin: 44px 0 0; font-size: 23px; }
.doc h3 { margin: 28px 0 0; font-size: 18px; }
.doc p, .doc li { color: #2c3a30; }
.doc ul { padding-left: 22px; }
.doc li + li { margin-top: 6px; }
.doc .note {
  margin-top: 28px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--muted);
  font-size: 15px;
}
.doc table { width: 100%; border-collapse: collapse; margin-top: 16px; font-size: 15px; }
.doc th, .doc td { text-align: left; padding: 10px 12px; border: 1px solid var(--line); vertical-align: top; }
.doc th { background: var(--surface); font-weight: 650; }

.doc-links { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 16px; font-size: 15px; }

/* ---------- footer ---------- */

.site-footer {
  padding: 40px 0;
  background: #10241a;
  color: #cfe0d5;
  font-size: 14px;
}
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 18px 32px; align-items: center; }
.site-footer strong { color: #fff; }
.site-footer nav { margin-left: auto; display: flex; flex-wrap: wrap; gap: 18px; }
.site-footer a { color: #cfe0d5; }
.site-footer a:hover { color: #fff; }

@media (max-width: 820px) {
  .hero { padding: 48px 0 24px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 32px; }
  .hero-art { order: -1; }
  .hero-art img { width: 176px; }
  h1 { font-size: 34px; }
  .features { grid-template-columns: 1fr; }
  .site-header nav a { padding: 8px; }
}