/* Set 20 — forest condition columns: full pine bar, three tall scene cards, repeated stride. */
:root {
  --pine: #166534;
  --pine-deep: #14532d;
  --stone: #ecfdf5;
  --card: #ffffff;
  --ink: #052e16;
  --text: #14532d;
  --mute: #3f6b54;
  --line: #a7f3d0;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "Avenir Next", "PingFang SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  background: var(--stone);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

a { color: inherit; text-decoration: none; }
svg { display: block; }

.lane { width: min(1180px, calc(100% - 28px)); margin: 0 auto; }

.pine {
  background: var(--pine);
  color: #d1fae5;
}

.pine-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 66px;
}

.sig {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: #ecfdf5;
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 14px;
  font-size: 13px;
}

.links a { color: #a7f3d0; padding: 6px 0; }
.links a:hover,
.links a:focus { color: #ffffff; }

.stone-hero {
  padding: 40px 0 8px;
}

.stone-hero h1 {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.28;
  color: var(--ink);
  margin-bottom: 14px;
  max-width: 18em;
}

.stone-hero p {
  max-width: 48em;
  margin-bottom: 10px;
}

.slab { padding: 32px 0 6px; }

.slab h2 {
  font-size: clamp(20px, 2.2vw, 25px);
  color: var(--ink);
  margin-bottom: 10px;
}

.lead-in { margin-bottom: 18px; max-width: 50em; }

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

.cond article {
  background: var(--card);
  padding: 22px 18px 18px;
  border: 1px solid var(--line);
  min-height: 100%;
}

.cond .badge {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--stone);
  color: var(--pine);
  display: grid;
  place-items: center;
  margin-bottom: 12px;
}

.cond h3 { font-size: 18px; color: var(--pine-deep); margin-bottom: 8px; }

.stride-stack { display: grid; gap: 16px; }

.stride {
  background: var(--card);
  padding: 16px 18px 8px;
  border-left: 6px solid var(--pine);
}

.stride h3 {
  font-size: 17px;
  color: var(--pine-deep);
  margin-bottom: 12px;
}

.stride ol {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  list-style: none;
  padding-bottom: 10px;
}

.stride li {
  background: var(--stone);
  padding: 10px 12px;
  border-radius: 8px;
}

.stride li b {
  display: block;
  color: var(--pine);
  font-size: 12px;
  margin-bottom: 4px;
}

.gain {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
}

.gain th,
.gain td {
  border: 1px solid var(--line);
  padding: 11px 12px;
  text-align: left;
  vertical-align: top;
}

.gain th {
  background: var(--pine);
  color: #ecfdf5;
}

.kit {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.kit article {
  background: var(--card);
  padding: 16px 14px;
}

.kit .ico { color: var(--pine); margin-bottom: 8px; }
.kit h3 { font-size: 16px; color: var(--ink); margin-bottom: 6px; }

.back-now {
  display: grid;
  gap: 10px;
}

.back-now article {
  background: #ffffff;
  padding: 14px 16px;
  border-bottom: 2px solid var(--pine);
}

.back-now h3 { font-size: 16px; color: var(--pine-deep); margin-bottom: 6px; }

.bound-strip {
  background: var(--pine);
  color: #ecfdf5;
  padding: 22px 20px;
}

.bound-strip h3 {
  color: #ffffff;
  margin-bottom: 8px;
}

.layers { display: grid; gap: 12px; }

.layers article {
  background: var(--card);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 14px;
  align-items: start;
}

.layers strong {
  color: var(--pine);
  font-size: 14px;
}

.layers h3 { font-size: 16px; color: var(--ink); margin-bottom: 6px; }

.ask details {
  background: var(--card);
  margin-bottom: 8px;
  padding: 12px 16px;
  border: 1px solid var(--line);
}

.ask summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--ink);
}

.ask details p { margin-top: 8px; }

.end {
  margin-top: 36px;
  background: var(--pine-deep);
  color: #bbf7d0;
  padding: 26px 0 20px;
  font-size: 14.5px;
}

.end p { margin-bottom: 8px; max-width: 52em; }
.end .legal { color: #d1fae5; margin-top: 12px; }

@media (max-width: 900px) {
  .pine-row { flex-direction: column; align-items: flex-start; padding: 12px 0; }
  .cond,
  .kit { grid-template-columns: 1fr; }
  .stride ol { grid-template-columns: 1fr 1fr; }
  .layers article { grid-template-columns: 1fr; }
}