:root {
  --coral: #e07a5f;
  --ink: #3d405b;
  --rice: #f4f1de;
  --deep: #2b2d42;
  --line: #d4c7a8;
}

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

body {
  margin: 0;
  background: var(--rice);
  color: var(--ink);
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

a { color: var(--deep); }

.band {
  background: var(--coral);
  color: #fff8f5;
  padding: 0.95rem 5vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.brand {
  color: #fff8f5;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0.03em;
}

.band nav { display: flex; flex-wrap: wrap; gap: 0.75rem 1.1rem; font-size: 0.9rem; }
.band nav a { color: #fff8f5; text-decoration: none; border-bottom: 1px solid transparent; }
.band nav a:hover { border-bottom-color: #fff8f5; }

.hero {
  padding: 2.4rem 5vw 1.2rem;
  max-width: 46rem;
}

.hero h1 { color: var(--deep); font-size: 1.85rem; line-height: 1.35; }
.hero time { color: var(--coral); font-size: 0.88rem; }

.matrix {
  margin: 0.6rem 5vw 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
}

.cell {
  padding: 1.1rem 1.15rem 0.7rem;
  min-height: 11rem;
}

.cell.yes { background: var(--ink); color: #f4f1de; }
.cell.no { background: var(--coral); color: #fff8f5; }
.cell h3 { margin-top: 0; font-size: 1rem; letter-spacing: 0.04em; }

.scenes,
.signals,
.flow,
.chart,
.why,
.faq {
  margin: 0 5vw 2rem;
}

.scene-list {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 0.8rem;
}

.scene {
  background: #fffdf6;
  border: 1px solid var(--line);
  padding: 0.9rem 1rem 0.4rem;
}

.scene.wide { grid-column: 1 / -1; display: grid; grid-template-columns: 2.2rem 1fr; gap: 0.7rem; }

.signals ol {
  margin: 0.6rem 0;
  padding: 0;
  list-style: none;
}

.signals li {
  margin: 0.45rem 0;
  padding: 0.7rem 0.9rem;
  background: #fffdf6;
  border-left: 5px solid var(--coral);
}

.flow ol {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.55rem;
  list-style: none;
  padding: 0;
  counter-reset: hop;
}

.flow li {
  background: var(--ink);
  color: #f4f1de;
  padding: 0.85rem 0.8rem;
  min-height: 8rem;
}

.flow li::before {
  counter-increment: hop;
  content: counter(hop);
  display: block;
  color: var(--coral);
  font-weight: 800;
  margin-bottom: 0.35rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fffdf6;
}

th, td {
  border: 1px solid var(--line);
  padding: 0.6rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

th { background: var(--coral); color: #fff8f5; }

.faq details {
  background: #fffdf6;
  border: 1px solid var(--line);
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.8rem;
}

summary { cursor: pointer; font-weight: 700; color: var(--deep); }

.foot {
  background: var(--deep);
  color: #f4f1de;
  padding: 1.5rem 5vw 2rem;
  font-size: 0.9rem;
}

.foot p { margin: 0 0 0.5rem; }

@media (max-width: 820px) {
  .matrix, .scene-list, .flow { grid-template-columns: 1fr; }
  .scene.wide { grid-template-columns: 1fr; }
}