:root {
  --bg: #f3f6f1;
  --panel: #ffffff;
  --ink: #17271e;
  --muted: #617066;
  --line: #dce5da;
  --green: #2f7d4a;
  --green-dark: #1f5f37;
  --amber: #d9a12d;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
}

a { color: var(--green-dark); }
.site-header {
  min-height: 72px;
  padding: 12px max(24px, calc((100% - 1080px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; line-height: 1.25; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; color: #fff; background: var(--green); border-radius: 8px; font-weight: 800; }
.brand strong, .brand small { display: block; }
.brand small { color: var(--muted); font-size: 12px; }
.header-actions { display: flex; align-items: center; gap: 18px; }
.header-actions a { font-size: 14px; font-weight: 700; text-decoration: none; }
.header-actions .demo-link { padding: 8px 14px; border-radius: 7px; color: #fff; background: var(--green); }

main { width: min(1000px, calc(100% - 40px)); margin: 0 auto; padding: 60px 0; }
.hero { max-width: 820px; margin-bottom: 34px; }
.eyebrow { margin: 0 0 8px; color: var(--green); font-size: 12px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; }
h1 { margin: 0 0 16px; font-size: clamp(32px, 5vw, 48px); line-height: 1.2; letter-spacing: -0.04em; }
.hero > p:not(.eyebrow) { margin: 0; color: var(--muted); font-size: 18px; }
.meta { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 10px; }
.meta span { padding: 5px 10px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--muted); font-size: 12px; }

.section { margin-top: 18px; padding: 30px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.section-number { display: block; margin-bottom: 6px; color: var(--amber); font-size: 12px; font-weight: 800; }
.section h2 { margin: 0 0 14px; font-size: 25px; }
.section h3 { margin: 22px 0 8px; font-size: 17px; }
.section p { margin: 0 0 12px; color: #4f5f54; }
.section ul { margin: 8px 0 0; padding-left: 22px; color: #4f5f54; }
.section li + li { margin-top: 7px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { padding: 20px; border: 1px solid var(--line); border-radius: 9px; background: #fafcf8; }
.card h3 { margin: 0 0 8px; }
.card p:last-child { margin-bottom: 0; }
.flow { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; counter-reset: step; }
.flow div { min-height: 112px; padding: 16px; border: 1px solid var(--line); border-radius: 9px; background: #fafcf8; }
.flow div::before { counter-increment: step; content: "0" counter(step); display: block; margin-bottom: 8px; color: var(--green); font-size: 12px; font-weight: 800; }
.flow strong, .flow span { display: block; }
.flow span { margin-top: 5px; color: var(--muted); font-size: 13px; }
.callout { border-color: #c9dfcb; background: #eef7ed; }
.honesty { border-color: #ecd5ad; background: #fff8ea; }
.metric-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.metric-table th, .metric-table td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.metric-table th { color: var(--muted); font-size: 12px; }
footer { padding: 24px; border-top: 1px solid var(--line); color: var(--muted); text-align: center; font-size: 12px; }

@media (max-width: 760px) {
  .site-header { align-items: flex-start; }
  .header-actions { flex-direction: column; align-items: flex-end; gap: 4px; }
  main { padding-top: 40px; }
  .grid, .grid.three, .flow { grid-template-columns: 1fr; }
  .section { padding: 22px; }
  .hero > p:not(.eyebrow) { font-size: 16px; }
}