:root {
  --crimson: #B42318;
  --cream: #FFFBEB;
  --brick: #7A271A;
  --ink: #111827;
  --card: #fffdf6;
  --line: #F5D0C5;
}

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

body {
  font-family: Georgia, "Songti SC", "SimSun", serif;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.8;
}

svg { display: block; }
a { color: var(--brick); text-decoration: none; }
a:hover { text-decoration: underline; }

.frame {
  width: min(1080px, calc(100% - 36px));
  margin: 0 auto;
}

.topbar {
  background: var(--cream);
  border-bottom: 1px solid var(--line);
}

.topbar-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--crimson);
  font-weight: 700;
  font-size: 18px;
}

.brand svg { width: 26px; height: 26px; }

.menu {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 13px;
}

.lede {
  padding: 28px 0 20px;
}

.lede h1 {
  font-size: 28px;
  font-weight: 700;
  max-width: 18em;
  margin-bottom: 12px;
  color: var(--brick);
}

.lede p {
  max-width: 40em;
  margin-bottom: 8px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 15px;
}

.phenoms {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding-bottom: 28px;
}

.phenom {
  background: var(--card);
  border-top: 4px solid var(--crimson);
  padding: 16px 14px 18px;
  box-shadow: 0 1px 0 #FDE68A;
}

.phenom .num {
  font-family: "Segoe UI", sans-serif;
  font-size: 12px;
  color: var(--crimson);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.phenom svg {
  width: 28px;
  height: 28px;
  color: var(--brick);
  margin-bottom: 8px;
}

.phenom h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.phenom p {
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 13px;
}

.block {
  padding: 8px 0 32px;
}

.block h2 {
  font-size: 22px;
  color: var(--brick);
  margin-bottom: 10px;
}

.block > p {
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  margin-bottom: 12px;
}

.cause {
  width: 100%;
  border-collapse: collapse;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  background: #fff;
}

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

.cause th {
  background: var(--brick);
  color: #FFFBEB;
}

.cause tr:nth-child(even) td { background: #FFF7ED; }

.track {
  display: flex;
  gap: 0;
  margin-top: 16px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #fff;
  border: 1px solid var(--line);
}

.step {
  flex: 1;
  padding: 16px 14px;
  border-right: 1px dashed var(--crimson);
}

.step:last-child { border-right: 0; }

.step b {
  display: block;
  color: var(--crimson);
  margin-bottom: 6px;
  font-size: 13px;
}

.slab {
  background: #fff;
  border-left: 5px solid var(--crimson);
  padding: 16px 18px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.slab li { margin: 8px 0 8px 20px; }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 14px;
}

.split article {
  background: #fff;
  padding: 18px 16px;
  border: 1px solid var(--line);
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.split h3 {
  font-family: Georgia, serif;
  color: var(--brick);
  margin-bottom: 8px;
}

.qr-sketch {
  width: 72px;
  height: 72px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 3px;
  margin: 10px 0;
}

.qr-sketch span { background: #E5E7EB; }
.qr-sketch span.on { background: var(--brick); }

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

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

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

.base {
  background: var(--ink);
  color: #FDE68A;
  padding: 26px 0;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 13px;
}

.base p { margin-bottom: 8px; }

@media (max-width: 900px) {
  .phenoms, .split, .track { grid-template-columns: 1fr; }
  .phenoms { grid-template-columns: 1fr 1fr; }
  .track { flex-direction: column; }
  .step { border-right: 0; border-bottom: 1px dashed var(--crimson); }
  .topbar-row { flex-direction: column; }
}

@media (max-width: 560px) {
  .phenoms { grid-template-columns: 1fr; }
  .lede h1 { font-size: 22px; }
}