:root {
  --olive: #657436;
  --olive-deep: #3F4A22;
  --wash: #F4F1E6;
  --problem: #3D2A1C;
  --solve: #E8EED6;
  --ink: #2B3318;
  --muted: #5B5346;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--wash);
  color: var(--ink);
  line-height: 1.75;
}

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

.wrap { width: min(1160px, calc(100% - 28px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--olive-deep);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand { color: #F4F1E6; font-weight: 800; }

.nav { display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 14px; }
.nav a { color: #E8EED6; }

.hero { padding: 36px 0 10px; }

.hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-radius: 18px;
  overflow: hidden;
}

.hero-problem, .hero-solve { padding: 28px 24px; }
.hero-problem { background: var(--problem); color: #F8EFE4; }
.hero-solve { background: var(--olive); color: #F8FBEA; }

.hero h1 {
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.35;
  grid-column: 1 / -1;
}

.kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
  opacity: 0.8;
}

.section { padding: 28px 0; }

.section h2 {
  font-size: clamp(21px, 2.8vw, 27px);
  color: var(--olive-deep);
  margin-bottom: 14px;
}

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-radius: 16px;
  overflow: hidden;
  margin: 14px 0 16px;
}

.pair .problem, .pair .solve { padding: 18px 16px; }
.pair .problem { background: var(--problem); color: #F8EFE4; }
.pair .solve { background: var(--solve); color: var(--ink); }
.pair h3 { font-size: 17px; margin-bottom: 8px; }

.card-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 16px 0;
}

.olive-card {
  background: #fff;
  border: 2px solid var(--olive);
  border-radius: 14px;
  padding: 14px;
  color: var(--olive-deep);
}
.olive-card svg { display: block; margin-bottom: 8px; color: var(--olive); }

.steps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 16px 0;
}

.step {
  background: #fff;
  border-left: 5px solid var(--olive);
  padding: 14px;
}

.step b { color: var(--olive-deep); }

.table-wrap { overflow-x: auto; margin: 16px 0; }

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

th, td {
  border: 1px solid #C9D2A8;
  padding: 12px;
  text-align: left;
  vertical-align: top;
}

th { background: var(--olive); color: #fff; }

.svg-card {
  background: #fff;
  border-radius: 16px;
  padding: 16px;
  margin: 16px 0;
}

.faq-list { display: grid; gap: 12px; }

.faq-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-radius: 12px;
  overflow: hidden;
}

.faq-item h3 {
  background: var(--problem);
  color: #F8EFE4;
  font-size: 16px;
  padding: 14px;
}

.faq-item p {
  background: var(--solve);
  margin: 0;
  padding: 14px;
}

.site-footer {
  background: var(--olive-deep);
  color: #E8EED6;
  padding: 28px 0 40px;
  font-size: 14px;
}

.site-footer p { margin-bottom: 8px; }

@media (max-width: 860px) {
  .header-bar { flex-direction: column; align-items: flex-start; padding: 12px 0; }
  .hero-split, .pair, .card-row, .steps, .faq-item { grid-template-columns: 1fr; }
}