:root {
  --bg: #f3f6f4;
  --card: #ffffff;
  --ink: #16302b;
  --muted: #5d706b;
  --line: #dce6e2;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --hero: #0c2f2b;
  --accent: #c4a35a;
  --radius: 14px;
  --shadow: 0 10px 28px rgba(12, 47, 43, 0.07);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

a { color: inherit; text-decoration: none; }

.wrap {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--brand-dark);
}

.brand svg { width: 32px; height: 32px; }

.menu {
  display: flex;
  gap: 26px;
  color: var(--muted);
  font-size: 15px;
}

.menu a:hover { color: var(--brand); }

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  font-size: 22px;
}

.hero {
  background: linear-gradient(160deg, #0c2f2b 0%, #14534d 62%, #1b7a6f 100%);
  color: #fff;
  padding: 80px 0 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.hero-tag {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 4.6vw, 44px);
  line-height: 1.22;
}

.hero p {
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 16px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 26px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
  height: 42px;
  padding: 0 16px;
  border-radius: 8px;
  font-weight: 600;
}

.btn-primary { background: var(--accent); color: #2a2110; }
.btn-ghost { border: 1px solid rgba(255, 255, 255, 0.35); color: #fff; }

.hero-panel {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 22px;
}

.hero-panel div {
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-panel div:last-child { border-bottom: 0; }

.hero-panel strong { display: block; color: #fff; }
.hero-panel span { color: rgba(255, 255, 255, 0.62); font-size: 13px; }

html { scroll-behavior: smooth; }
.section { padding: 70px 0; }
.section.alt { background: #fff; }

.kicker {
  margin: 0 0 8px;
  color: var(--brand);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.section h2 { margin: 0 0 10px; font-size: 28px; }

.lead {
  color: var(--muted);
  margin: 0 0 28px;
  max-width: 680px;
}

.intro-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: start;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 36px;
}

.metric {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 16px;
}

.metric b { display: block; color: var(--brand); font-size: 22px; }
.metric span { color: var(--muted); font-size: 13px; }

.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.scene {
  display: flex;
  gap: 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}

.scene em {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: #e6f4f2;
  color: var(--brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-style: normal;
  font-weight: 700;
}

.scene h3 { margin: 0 0 6px; font-size: 17px; }
.scene p { margin: 0; color: var(--muted); }

.sol {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: 12px;
  padding: 22px;
}

.sol .no {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.sol h3 { margin: 0 0 8px; }
.sol p { margin: 0; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}

.card h3 { margin: 0 0 10px; }
.card p { margin: 0 0 8px; color: var(--muted); }
.card p:last-child { margin-bottom: 0; }

.page-head { padding: 48px 0 12px; }
.article p { color: #334155; }

.footer {
  background: #14221f;
  color: rgba(255, 255, 255, 0.72);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 28px;
}

.footer h3 { margin: 0 0 12px; color: #fff; font-size: 15px; }
.footer .brand-name { margin: 0 0 10px; font-size: 22px; color: #fff; }
.footer p { margin: 0; color: rgba(255, 255, 255, 0.5); }
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: 8px; }
.footer a { color: rgba(255, 255, 255, 0.5); }
.footer a:hover { color: #fff; }

.footer-bottom {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.4);
  font-size: 13px;
}

.footer-bottom a { color: rgba(255, 255, 255, 0.5); }

@media (max-width: 800px) {
  .nav-toggle { display: block; }
  .menu {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 68px;
    background: #fff;
    flex-direction: column;
    padding: 16px 20px 20px;
    gap: 12px;
    border-bottom: 1px solid var(--line);
  }
  .menu.open { display: flex; }
  .hero-grid, .intro-layout, .grid-2, .footer-grid, .metric-row { grid-template-columns: 1fr; }
}