:root {
  --ink: #14201a;
  --muted: #5b6b62;
  --line: #e3e9e4;
  --bg: #fbfdfb;
  --card: #ffffff;
  --accent: #1c7c54;
  --accent-soft: #e8f4ee;
  --warn: #b45309;
  --radius: 14px;
  --max: 1040px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max);
  margin: 0 auto;
  padding: 22px 24px;
}

.logo { font-weight: 700; font-size: 18px; color: var(--ink); letter-spacing: .5px; }
.logo span {
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 6px;
  padding: 2px 6px;
  margin-left: 4px;
  vertical-align: 3px;
}

.nav nav { display: flex; align-items: center; gap: 22px; }
.nav nav a { color: var(--muted); font-size: 14px; text-decoration: none; }
.nav nav a:hover { color: var(--ink); }

main { max-width: var(--max); margin: 0 auto; padding: 0 24px 24px; }

.hero { padding: 72px 0 48px; max-width: 780px; }
.eyebrow {
  display: inline-block;
  font-size: 13px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 4px 12px;
  margin: 0 0 18px;
}
.hero h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.25; margin: 0 0 20px; letter-spacing: -.5px; }
.lede { font-size: 17px; color: var(--muted); max-width: 700px; }
.lede strong { color: var(--ink); }
.lede.small { font-size: 15px; }

.cta-row { display: flex; gap: 12px; margin: 30px 0 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--accent);
  transition: transform .12s ease, opacity .12s ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; opacity: .94; }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.small { padding: 8px 14px; font-size: 13px; }

/* 导航栏里的按钮：压过 .nav nav a 的灰色，保证绿底白字 */
.nav nav a.btn,
.nav nav a.btn:hover,
.nav nav a.btn:visited { color: #fff; text-decoration: none; }

.tiny { font-size: 13px; color: var(--muted); }
.tiny a { color: var(--muted); }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 26px 0;
}
.stats div { text-align: center; }
.stats strong { display: block; font-size: 26px; color: var(--accent); }
.stats span { font-size: 13px; color: var(--muted); }

section { padding: 64px 0; }
section h2 { font-size: 26px; margin: 0 0 26px; letter-spacing: -.3px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.cards article, .plan {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.cards h3 { margin: 0 0 10px; font-size: 17px; }
.cards p { margin: 0; color: var(--muted); font-size: 14.5px; }

.sample .mail {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 760px;
}
.mail-subject {
  margin: 0;
  padding: 16px 22px;
  border-bottom: 1px solid var(--line);
  font-weight: 600;
  background: #f6faf7;
}
.mail-body { padding: 20px 22px; font-size: 14.5px; }
.mail-body p { margin: 0 0 10px; }
.mail-body .meta { color: var(--muted); font-size: 13px; }
.mail-body .mail-more { color: var(--muted); font-size: 13px; margin-top: 16px; }

.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; align-items: start; }
.plan.featured { border-color: var(--accent); box-shadow: 0 8px 30px rgba(28, 124, 84, .08); position: relative; }
.badge {
  position: absolute; top: -11px; left: 20px;
  background: var(--accent); color: #fff;
  font-size: 12px; padding: 2px 10px; border-radius: 999px; margin: 0;
}
.plan h3 { margin: 0 0 6px; font-size: 16px; color: var(--muted); font-weight: 600; }
.price { font-size: 34px; font-weight: 700; margin: 0 0 16px; }
.price span { font-size: 14px; color: var(--muted); font-weight: 400; }
.plan ul { list-style: none; padding: 0; margin: 0 0 20px; }
.plan li { font-size: 14px; color: var(--muted); padding: 5px 0; }
.plan li::before { content: "✓"; color: var(--accent); margin-right: 8px; font-weight: 700; }

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}
.faq summary { cursor: pointer; font-weight: 600; }
.faq summary::-webkit-details-marker { color: var(--accent); }
.faq p { color: var(--muted); font-size: 14.5px; margin: 10px 0 0; max-width: 720px; }

.final { text-align: center; border-top: 1px solid var(--line); }
.final h2 { margin-bottom: 8px; }
.final .btn { margin-top: 22px; }

footer {
  border-top: 1px solid var(--line);
  padding: 28px 24px 40px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
}
footer p { margin: 4px 0; }

@media (max-width: 860px) {
  .cards, .plans { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); row-gap: 20px; }
  .nav nav a:not(.btn) { display: none; }
  .hero { padding-top: 48px; }
}