/* CN: terracotta console, 220px sticky aside + main, number rail steps, tables, note cards */
:root {
  --clay: #C45C26;
  --clay-deep: #8A3B14;
  --sand: #E8D5B7;
  --sand-light: #F6EDDC;
  --paper: #FFF9F0;
  --ink: #3B2416;
  --mute: #6B4E3A;
  --line: #D8C2A2;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--sand-light);
  color: var(--ink);
  font-family: "Palatino Linotype", "Source Han Serif SC", "SimSun", "Microsoft YaHei", serif;
  line-height: 1.75;
}

a {
  color: var(--clay-deep);
  text-decoration: none;
}

a:hover {
  color: var(--clay);
}

.desk {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}

.rail-nav {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  background: var(--sand);
  border-right: 1px solid var(--line);
  padding: 20px 16px;
  overflow: auto;
}

.brand-lock {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  color: var(--clay-deep);
  margin-bottom: 22px;
}

.brand-lock:hover {
  color: var(--clay-deep);
}

.side-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

.side-links a {
  display: block;
  padding: 8px 10px;
  background: rgba(255, 249, 240, 0.6);
  border-left: 3px solid transparent;
}

.side-links a:hover {
  border-left-color: var(--clay);
  background: var(--paper);
  text-decoration: none;
}

.stage {
  padding: 0 40px 48px;
  max-width: 920px;
}

.mast-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 18px 0 8px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  color: var(--mute);
}

.hero-path {
  padding: 12px 0 28px;
}

.hero-path h1 {
  margin: 0 0 14px;
  font-size: 28px;
  line-height: 1.4;
  color: var(--clay-deep);
}

.hero-path p {
  margin: 0 0 10px;
  color: var(--mute);
}

.chapter {
  padding: 28px 0 8px;
  border-top: 1px dashed var(--line);
}

.chapter h2 {
  margin: 0 0 10px;
  font-size: 22px;
  color: var(--clay-deep);
}

.blurb {
  margin: 0 0 18px;
  color: var(--mute);
}

.prep-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
}

.prep-table th,
.prep-table td {
  border: 1px solid var(--line);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

.prep-table th {
  background: var(--clay);
  color: #fff;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.prep-table td:first-child {
  width: 22%;
  font-weight: 700;
}

.track {
  margin: 0;
  padding: 0;
  list-style: none;
}

.track li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  margin-bottom: 18px;
}

.num {
  width: 40px;
  height: 40px;
  border-radius: 4px;
  background: var(--clay);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-weight: 700;
}

.track h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.track p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--mute);
}

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.note-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 4px solid var(--clay);
  padding: 16px 16px 12px;
}

.note-card h3 {
  margin: 6px 0 8px;
  font-size: 16px;
}

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

.fail-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
}

.fail-table th,
.fail-table td {
  border: 1px solid var(--line);
  padding: 12px;
  vertical-align: top;
  text-align: left;
  font-size: 14px;
}

.fail-table th {
  background: var(--clay-deep);
  color: #fff;
}

.habit {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  background: var(--paper);
  padding: 16px;
  margin-bottom: 12px;
  border-left: 6px solid var(--sand);
}

.habit h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.habit p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--mute);
}

.qa {
  margin: 0;
}

.qa dt {
  font-weight: 700;
  margin-top: 16px;
  padding: 8px 0 4px;
  color: var(--clay-deep);
}

.qa dd {
  margin: 0;
  padding-bottom: 8px;
}

.qa dd p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--mute);
}

.foot {
  grid-column: 1 / -1;
  background: var(--clay-deep);
  color: #F3E2CC;
  padding: 28px 40px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.foot-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 920px;
}

.foot h2,
.foot .foot-k {
  margin: 0 0 8px;
  font-size: 14px;
  color: #fff;
  font-weight: 700;
}

.foot p {
  margin: 0 0 8px;
  font-size: 13px;
}

.license {
  max-width: 920px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(232, 213, 183, 0.3);
  font-size: 12px;
}

@media (max-width: 900px) {
  .desk {
    grid-template-columns: 1fr;
  }

  .rail-nav {
    position: relative;
    height: auto;
    width: 100%;
  }

  .side-links {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .stage {
    padding: 0 20px 36px;
  }

  .cards,
  .foot-split {
    grid-template-columns: 1fr;
  }
}