:root {
  --amber: #d97706;
  --amber-ink: #7c2d12;
  --paper: #fffbeb;
  --card: #fff7ed;
  --line: #fde68a;
  --ink: #1c1917;
  --muted: #57534e;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
}
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.warn-rail {
  margin: 0;
  padding: 10px 16px;
  background: var(--amber);
  color: #fff;
  text-align: center;
  font-size: 14px;
  letter-spacing: 0.02em;
}
.mast {
  background: #fff;
  border-bottom: 3px solid var(--amber);
}
.mast-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  color: var(--amber-ink);
  text-decoration: none;
  font-size: 18px;
}
nav { display: flex; flex-wrap: wrap; gap: 12px 16px; }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
nav a:hover { color: var(--amber-ink); }
.hero { padding: 36px 0 12px; }
.kicker {
  margin: 0 0 8px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 700;
}
.hero h1 { margin: 0 0 12px; font-size: clamp(26px, 4vw, 36px); line-height: 1.25; }
.hero p { margin: 0; max-width: 46em; }
.block { padding: 40px 0; }
.block.tint { background: #fff7ed; }
h2 { margin: 0 0 14px; font-size: 24px; line-height: 1.3; }
h3 { margin: 8px 0; font-size: 17px; }
p { margin: 0 0 12px; }
.diag-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin-top: 20px;
}
.diag-box {
  background: #fff;
  border: 1px solid var(--line);
  border-top: 4px solid var(--amber);
  padding: 14px 12px;
  min-height: 100%;
}
.diag-box svg { width: 40px; height: 40px; color: var(--amber); display: block; }
.src-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 18px;
}
.src-card {
  background: #fff;
  padding: 16px;
  border: 1px dashed var(--amber);
}
.src-card svg { width: 100%; height: 40px; color: var(--amber-ink); }
.split {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 24px;
  align-items: start;
}
.note-card {
  background: #fff;
  border-left: 6px solid var(--amber);
  padding: 16px;
}
.note-card svg { width: 36px; height: 36px; color: var(--amber); }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: #fff; }
caption { text-align: left; padding: 0 0 8px; color: var(--muted); }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
th { background: #fef3c7; }
.rail-steps { list-style: none; margin: 18px 0 0; padding: 0; }
.rail-steps li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  padding: 12px 0;
  border-left: 2px solid var(--line);
  margin-left: 18px;
  padding-left: 18px;
}
.rail-steps span {
  width: 40px;
  height: 40px;
  border-radius: 4px;
  background: var(--amber);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-left: -42px;
}
.cols-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.faq dt { font-weight: 700; margin: 18px 0 6px; }
.faq dd { margin: 0 0 8px; padding: 12px; background: #fff; border: 1px solid var(--line); }
footer {
  background: #7c2d12;
  color: #ffedd5;
  padding: 28px 0;
  font-size: 14px;
}
footer p { margin: 0 0 8px; }
@media (max-width: 960px) {
  .diag-track, .src-grid, .split, .cols-2 { grid-template-columns: 1fr; }
}