/* cn：左侧时间线轨道 + 右侧内容，日出橙 */
:root {
  --sun: #E85D04;
  --sun-deep: #9D3604;
  --sun-soft: #F48C06;
  --cream: #FFF7ED;
  --sheet: #FFFDF9;
  --ink: #2B1408;
  --muted: #6B4A32;
  --line: #F0D9C2;
  --track: 88px;
}

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

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.7;
}

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

.sun-top {
  background: linear-gradient(90deg, var(--sun-deep), var(--sun));
  color: #FFF7ED;
  padding: 14px 28px 16px;
}

.sun-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.sun-brand svg { width: 28px; height: 28px; }

.sun-top nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-top: 12px;
  font-size: 13px;
}

.sun-top nav a {
  color: #FFE8D0;
  padding: 2px 0;
  border-bottom: 2px solid transparent;
}

.sun-top nav a:hover,
.sun-top nav a:focus {
  color: #fff;
  border-bottom-color: #FFE8D0;
}

.hero-sun {
  padding: 28px 28px 8px 28px;
  max-width: 1040px;
  margin-left: var(--track);
}

.hero-sun h1 {
  margin: 0 0 14px;
  font-size: 30px;
  line-height: 1.35;
  color: var(--sun-deep);
}

.hero-sun p {
  margin: 0 0 12px;
  color: var(--muted);
  max-width: 46em;
}

.track-wrap {
  position: relative;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 28px 40px;
}

.rail-line {
  position: absolute;
  left: 36px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--sun);
}

.block {
  position: relative;
  margin: 0 0 8px;
  padding: 8px 0 20px var(--track);
}

.node {
  position: absolute;
  left: 26px;
  top: 22px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--cream);
  border: 3px solid var(--sun);
  z-index: 1;
}

.node span {
  display: none;
}

.block h2 {
  margin: 0 0 10px;
  font-size: 22px;
  color: var(--sun-deep);
  line-height: 1.4;
}

.block > p {
  margin: 0 0 12px;
  color: var(--muted);
}

.card-sun {
  background: var(--sheet);
  border: 1px solid var(--line);
  border-radius: 0 12px 12px 0;
  border-left: 4px solid var(--sun);
  padding: 14px 16px;
  margin-bottom: 10px;
}

.card-sun:hover { border-left-color: var(--sun-deep); }

.card-sun svg {
  width: 26px;
  height: 26px;
  color: var(--sun);
  display: block;
  margin-bottom: 8px;
}

.card-sun h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--sun-deep);
}

.card-sun p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--muted);
}

.card-sun p:last-child { margin-bottom: 0; }

.duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.steps-sun {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin: 8px 0 12px;
}

.steps-sun .step {
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 12px 14px;
  border-top: 4px solid var(--sun);
}

.steps-sun .step b {
  display: block;
  color: var(--sun);
  font-size: 12px;
  margin-bottom: 6px;
}

.steps-sun .step p { margin: 0; font-size: 14px; color: var(--muted); }

table.sun {
  width: 100%;
  border-collapse: collapse;
  background: var(--sheet);
  font-size: 14px;
  margin: 8px 0 12px;
}

table.sun th,
table.sun td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

table.sun th { background: var(--sun); color: #FFF7ED; }
table.sun tr:hover td { background: #FDE8D2; }

.faq-sun details {
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 10px 14px;
  margin-bottom: 8px;
  border-radius: 0 8px 8px 0;
}

.faq-sun summary {
  cursor: pointer;
  font-weight: 650;
  color: var(--sun-deep);
}

.faq-sun details p {
  margin: 8px 0 4px;
  color: var(--muted);
  font-size: 14px;
}

.site-foot {
  background: var(--sun-deep);
  color: #FFE8D0;
  padding: 28px 28px 36px;
  font-size: 13px;
}

.site-foot p { margin: 0 0 8px; max-width: 52em; }
.site-foot p:last-child { margin-bottom: 0; }

@media (max-width: 860px) {
  .hero-sun { margin-left: 0; }
  .rail-line,
  .node { display: none; }
  .block { padding-left: 0; }
  .duo,
  .steps-sun { grid-template-columns: 1fr; }
}