:root {
  --bg: #f4f6f2;
  --panel: #ffffff;
  --ink: #16241f;
  --muted: #66786f;
  --line: #dfe5db;
  --brand: #0f5c46;
  --brand-dark: #0a3d2e;
  --brand-soft: #e4efe9;
  --accent: #c7852a;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(22, 36, 31, .05), 0 10px 30px rgba(22, 36, 31, .06);
  --font: -apple-system, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
}

h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.01em; }
p { margin: 0 0 12px; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 760px; }

.muted { color: var(--muted); }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(244, 246, 242, .88);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
  justify-content: space-between;
}

.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand .mark {
  background: var(--brand);
  color: #fff;
  border-radius: 6px;
  padding: 3px 7px;
  font-size: 12px;
  letter-spacing: .06em;
}
.brand .word { font-size: 16px; }
.brand.small .word { font-size: 14px; }

.nav-links { display: flex; gap: 22px; font-size: 14px; }
.nav-links a { color: #3a4c44; }

.nav-act { display: flex; gap: 10px; align-items: center; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 8px 16px;
  font-size: 14px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  transition: background .15s, border-color .15s, transform .05s;
}
.btn:hover { text-decoration: none; border-color: #c7d2ca; }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-dark); }
.btn.ghost { background: transparent; }
.btn.lg { padding: 12px 22px; font-size: 15px; }

/* ---------- Hero ---------- */
.hero {
  padding: 84px 0 64px;
  background:
    radial-gradient(760px 420px at 12% -8%, #dcebe3 0%, transparent 62%),
    radial-gradient(620px 380px at 96% 4%, #f0e6d2 0%, transparent 58%);
}

.hero-inner { max-width: 880px; }

.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(30px, 4.4vw, 48px);
  line-height: 1.22;
  margin-bottom: 18px;
}

.lead { font-size: 17px; color: #3d4f47; max-width: 720px; margin-bottom: 26px; }

.hero-act { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 44px; }

.facts {
  display: flex;
  gap: 40px;
  list-style: none;
  margin: 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.facts li { display: flex; flex-direction: column; }
.facts strong { font-size: 26px; font-weight: 600; color: var(--brand); line-height: 1.2; }
.facts span { font-size: 13px; color: var(--muted); }

/* ---------- 区块 ---------- */
.band { padding: 64px 0; border-top: 1px solid var(--line); }
.band.alt { background: #fbfcfa; }

.section-title { font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 12px; }
.section-lead { color: #3d4f47; max-width: 680px; margin-bottom: 26px; }

.cols3, .cols2 { display: grid; gap: 16px; }
.cols3 { grid-template-columns: repeat(3, 1fr); }
.cols2 { grid-template-columns: repeat(2, 1fr); }

.tile {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.tile h3 { font-size: 17px; margin-bottom: 8px; }
.tile p { font-size: 14.5px; color: #45574f; margin: 0; }

/* ---------- 三个范围 ---------- */
.scope {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.scope header { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.scope .num {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--brand-soft);
  color: var(--brand);
  display: grid; place-items: center;
  font-weight: 600;
  font-size: 15px;
}
.scope h3 { font-size: 17px; }
.scope .muted { font-size: 13.5px; }
.scope ul { margin: 10px 0 0; padding-left: 18px; font-size: 14.5px; color: #45574f; }
.scope li { margin-bottom: 4px; }

/* ---------- 工作流 ---------- */
.steps {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.steps li {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 44px 20px 20px;
  box-shadow: var(--shadow);
}
.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 16px;
  left: 20px;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  display: grid; place-items: center;
}
.steps h3 { font-size: 16px; margin-bottom: 6px; }
.steps p { font-size: 14.5px; color: #45574f; margin: 0; }

/* ---------- FAQ ---------- */
details {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px;
  margin-bottom: 10px;
}
details[open] { box-shadow: var(--shadow); }
summary { cursor: pointer; font-weight: 600; font-size: 15px; }
details p { margin: 10px 0 0; font-size: 14.5px; color: #45574f; }

/* ---------- 申请演示 ---------- */
.band.cta { background: #0f3d33; color: #eaf3ee; border-top: 0; }
.band.cta .section-title, .band.cta a { color: #fff; }
.band.cta .section-lead { color: #c9ded3; }
.band.cta .muted { color: #a8c3b6; }

.cta-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }

.demo-form { display: grid; gap: 12px; }
.demo-form .row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.demo-form label { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: #b9d3c6; }
.demo-form input, .demo-form textarea {
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: #fff;
  border: 1px solid transparent;
  border-radius: 9px;
  padding: 10px 12px;
  width: 100%;
  resize: vertical;
}
.demo-form input:focus, .demo-form textarea:focus { outline: 2px solid #9fd0ba; }
.demo-form .btn { justify-self: start; background: #fff; color: var(--brand-dark); border-color: #fff; }

.status { font-size: 13.5px; margin: 0; color: #c9ded3; }
.status.ok { color: #b8ecc9; }
.status.bad { color: #ffc9c0; }

/* ---------- 页脚 ---------- */
.foot { padding: 28px 0; background: var(--bg); }
.foot-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.foot .muted { font-size: 13px; margin: 0; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .cols3, .cols2, .steps, .cta-inner { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 40px; }
  .facts { gap: 24px; }
}