:root {
  --bg: #101317;
  --bg-soft: #171b21;
  --panel: #141921;
  --panel-2: #1a2028;
  --line: rgba(202, 210, 223, 0.14);
  --line-strong: rgba(202, 210, 223, 0.24);
  --text: #e2e7ef;
  --text-soft: #aeb6c5;
  --text-dim: #8891a1;
  --platinum: #cfd5df;
  --steel: #8f98aa;
  --accent: #d8dee9;
  --green: #bcd7c7;
  --yellow: #d6c99e;
  --shadow: 0 14px 48px rgba(0, 0, 0, 0.24);
  --sidebar-width: 296px;
  --radius: 16px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); }
body {
  font-family: 'Cormorant Garamond', Georgia, serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
code, pre { font-family: 'Inter', ui-monospace, Consolas, monospace; }

.atlas-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 20px 24px;
  border-right: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(207,213,223,0.02), rgba(207,213,223,0.01)),
    var(--bg-soft);
}

.sidebar-brand { margin-bottom: 28px; }
.brand-mark {
  display: inline-block;
  font-family: 'Cormorant SC', serif;
  font-size: 1.95rem;
  letter-spacing: 0.16em;
  color: var(--platinum);
}
.brand-sub {
  margin-top: 8px;
  color: var(--text-soft);
  font-size: 0.96rem;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sidebar-link {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-soft);
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}
.sidebar-link:hover { background: rgba(207,213,223,0.05); color: var(--text); }
.sidebar-link.is-active {
  background: rgba(207,213,223,0.08);
  color: var(--text);
  box-shadow: inset 0 0 0 1px rgba(207,213,223,0.08);
}
.sidebar-key {
  font-family: 'Inter', sans-serif;
  font-size: 0.76rem;
  color: var(--steel);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.sidebar-label {
  font-size: 1rem;
}

.atlas-main {
  min-width: 0;
  padding: 32px 40px 56px;
}

.atlas-header {
  display: grid;
  gap: 16px;
  margin-bottom: 28px;
}

.atlas-kicker {
  font-family: 'Inter', sans-serif;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--steel);
  text-transform: uppercase;
}

.top-tabs {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(207,213,223,0.03);
}

.top-tab {
  padding: 10px 18px;
  border-radius: 999px;
  font-family: 'Inter', sans-serif;
  font-size: 0.92rem;
  color: var(--text-soft);
}
.top-tab.is-active {
  background: rgba(207,213,223,0.1);
  color: var(--text);
}

.atlas-disclaimer {
  max-width: 820px;
  padding: 14px 16px;
  border-left: 2px solid rgba(207,213,223,0.22);
  color: var(--text-soft);
  background: rgba(207,213,223,0.03);
  font-size: 1rem;
}

.atlas-content {
  max-width: 980px;
}

.chapter-intro {
  padding: 8px 0 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}
.chapter-kicker {
  font-family: 'Inter', sans-serif;
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 10px;
}
.chapter-intro h1 {
  margin: 0;
  font-size: clamp(2.4rem, 4vw, 4rem);
  line-height: 0.98;
  color: var(--platinum);
}
.chapter-summary {
  max-width: 700px;
  margin-top: 14px;
  font-size: 1.22rem;
  color: var(--text-soft);
}

.atlas-article {
  font-size: 1.24rem;
}
.atlas-article h2,
.atlas-article h3 {
  font-family: 'Cormorant SC', serif;
  font-weight: 600;
  color: var(--platinum);
  letter-spacing: 0.04em;
  margin: 36px 0 14px;
}
.atlas-article h2 { font-size: 1.46rem; }
.atlas-article h3 { font-size: 1.28rem; }
.atlas-article p { margin: 0 0 16px; max-width: 760px; }
.atlas-article ul { margin: 0 0 16px 1.4rem; }
.atlas-article li { margin-bottom: 6px; }

.atlas-note {
  margin: 0 0 24px;
  padding: 14px 18px;
  border-left: 2px solid rgba(207,213,223,0.25);
  background: rgba(207,213,223,0.04);
  color: var(--text-soft);
}

.atlas-code {
  overflow-x: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #0d1117;
  color: var(--accent);
}

.atlas-inline-link {
  color: var(--platinum);
  text-decoration: underline;
  text-decoration-color: rgba(207,213,223,0.35);
  text-underline-offset: 0.16em;
}

.table-wrap {
  overflow-x: auto;
  margin: 20px 0 28px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255,255,255,0.015);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

th, td {
  padding: 14px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}
th {
  font-family: 'Inter', sans-serif;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-soft);
}

.atlas-rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 28px 0;
}

.map-panel {
  margin: 0 0 28px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  box-shadow: var(--shadow);
}
.map-panel h2 {
  margin: 0 0 10px;
  font-family: 'Cormorant SC', serif;
  color: var(--platinum);
}
.map-copy {
  margin: 0 0 16px;
  color: var(--text-soft);
  font-size: 1.08rem;
}
.map-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.map-node {
  display: block;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255,255,255,0.02);
  min-height: 92px;
}
.map-node:hover { border-color: var(--line-strong); }
.map-node-key {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 10px;
}
.map-node-label {
  display: block;
  font-size: 1.16rem;
  color: var(--platinum);
}

.term-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.term-chip {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: 'Inter', sans-serif;
  font-size: 0.92rem;
}
.term-chip.is-green {
  background: rgba(188,215,199,0.08);
  color: var(--green);
}
.term-chip.is-yellow {
  background: rgba(214,201,158,0.08);
  color: var(--yellow);
}

.aux-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 10px 0 24px;
}
.aux-link {
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  color: var(--text-soft);
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.aux-link:hover { color: var(--text); border-color: var(--line-strong); }

@media (max-width: 1080px) {
  .atlas-shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding-bottom: 20px;
  }
  .atlas-main { padding: 24px 20px 48px; }
  .sidebar-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  }
}

@media (max-width: 720px) {
  .top-tabs {
    width: 100%;
    justify-content: space-between;
  }
  .top-tab { flex: 1 1 0; text-align: center; }
  .atlas-article { font-size: 1.12rem; }
  .chapter-intro h1 { font-size: 2.35rem; }
  .chapter-summary { font-size: 1.05rem; }
}