:root {
  --bg: #f4f7f6;
  --surface: #ffffff;
  --text: #16302c;
  --muted: #5b6f6b;
  --accent: #0f7a6c;
  --line: #d7e3df;
  --nav: #ffffff;
  --radius: 18px;
  --display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 0;
  font: inherit;
  cursor: pointer;
}
.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}
.muted { color: var(--muted); }
h1, h2, h3 { font-family: var(--display); line-height: 1.25; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
form { display: grid; gap: 12px; }
input, textarea, select {
  font: inherit;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
}
textarea { min-height: 120px; resize: vertical; }
.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 72px;
  padding: 32px 0 48px;
  color: var(--muted);
  font-size: 14px;
}
.ok { display: none; padding: 16px; border: 1px solid var(--line); }
.ok.show { display: block; }
a.beian {
  color: inherit;
  text-decoration: underline;
  cursor: pointer;
}
a.beian:hover { opacity: .85; }
@media (max-width: 860px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .wrap { width: min(1120px, calc(100% - 28px)); }
}

.topbar { background: var(--nav); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.topbar .inner { display: flex; justify-content: space-between; align-items: center; padding: 16px 0; }
.brand { font-weight: 700; color: var(--text); }
.nav a { margin-left: 18px; color: var(--text); }
.hero-split { display: grid; grid-template-columns: 1.1fr .9fr; min-height: 72vh; }
.hero-copy { padding: 80px 8vw 80px 0; display: flex; flex-direction: column; justify-content: center; }
.hero-copy h1 { font-size: clamp(36px, 5vw, 64px); margin: 10px 0 18px; }
.hero-visual { min-height: 420px; background-size: cover; background-position: center; border-radius: 0 0 0 80px; }
.steps { counter-reset: step; }
.steps article { padding: 20px 0 20px 72px; position: relative; border-bottom: 1px solid var(--line); }
.steps article::before { counter-increment: step; content: counter(step, decimal-leading-zero); position: absolute; left: 0; top: 18px; font-size: 22px; color: var(--accent); }
@media (max-width: 860px) { .hero-split { grid-template-columns: 1fr; } .hero-copy { padding: 40px 0; } }

@media (max-width: 860px) {
  .nav { display: flex; flex-wrap: wrap; }
  .nav a { margin: 4px 10px 4px 0; }
}