.topic-shell {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 44px 20px 64px;
}

.topic-rail {
  position: sticky;
  top: 84px;
  align-self: start;
  padding: 24px 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--brass-2);
  border-radius: 8px;
}

.topic-rail h2 {
  margin: 0 0 14px;
  font-size: 14px;
  font-family: var(--sans);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brass-hi);
}

.topic-rail ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.topic-rail li { margin-bottom: 10px; }

.topic-rail a {
  display: block;
  padding: 7px 10px;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  border-left: 2px solid transparent;
  border-radius: 0 4px 4px 0;
}

.topic-rail a:hover {
  color: var(--text);
  border-left-color: var(--primary);
}

.topic-rail-img {
  margin-top: 22px;
  padding: 8px;
  background: #101724;
  border: 1px solid rgba(176,141,87,0.35);
  border-radius: 6px;
  overflow: hidden;
}

.topic-rail-img img {
  display: block;
  width: 100%;
  max-width: 500px;
  max-height: 320px;
  object-fit: cover;
  border-radius: 4px;
}

.topic-rail-note {
  margin-top: 18px;
  font-family: var(--sans);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--muted);
}

.topic-content {
  position: relative;
  max-width: 760px;
}

.topic-content h1 {
  margin: 0 0 8px;
  font-size: clamp(1.9rem, 4.5vw, 2.8rem);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1.12;
}

.topic-intro {
  margin: 0 0 26px;
  padding: 18px 24px;
  font-size: 18px;
  font-style: italic;
  color: var(--text);
  border-left: 4px solid var(--brass-1);
  background: linear-gradient(100deg, rgba(176,141,87,0.10), transparent 70%);
}

.topic-content h2 {
  margin: 40px 0 14px;
  font-size: 24px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text);
}

.topic-content h3 {
  margin: 24px 0 10px;
  font-size: 18px;
  color: var(--brass-hi);
}

.topic-content p {
  margin: 0 0 16px;
  color: #D1D5DB;
}

.topic-content ul, .topic-content ol {
  margin: 0 0 18px;
  padding-left: 22px;
  color: #D1D5DB;
}

.topic-content li { margin-bottom: 9px; }

.topic-content li strong { color: var(--text); }

.topic-callout {
  margin: 28px 0;
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(225,29,72,0.12), rgba(31,41,55,0.7));
  border: 1px solid rgba(225,29,72,0.35);
  border-radius: 8px;
}

.topic-callout h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-family: var(--sans);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.topic-callout p { margin: 0; font-size: 14.5px; color: #E5E7EB; }

.topic-band {
  position: relative;
  margin: 34px -20px;
  padding: 26px 28px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(100deg, rgba(11,15,25,0.94), rgba(11,15,25,0.82)),
    var(--band-img, none) center/cover no-repeat;
}

.topic-band-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.topic-band-cell {
  padding: 16px 18px;
  background: rgba(17,24,39,0.75);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.topic-band-cell dt {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass-hi);
  margin-bottom: 6px;
}

.topic-band-cell dd {
  margin: 0;
  font-size: 14px;
  color: #D1D5DB;
}

.topic-table {
  width: 100%;
  margin: 8px 0 22px;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 13.5px;
}

.topic-table th, .topic-table td {
  padding: 11px 13px;
  text-align: left;
  border: 1px solid var(--border);
}

.topic-table th {
  background: rgba(176,141,87,0.12);
  color: var(--brass-hi);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.topic-table td { color: #D1D5DB; }

.topic-mosaic {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 30px 0 10px;
}

.topic-mosaic figure {
  margin: 0;
  padding: 8px;
  background: #101724;
  border: 1px solid rgba(176,141,87,0.35);
  border-radius: 8px;
  overflow: hidden;
}

.topic-mosaic img {
  display: block;
  width: 100%;
  max-width: 500px;
  max-height: 320px;
  object-fit: cover;
  border-radius: 4px;
}

.topic-mosaic figcaption {
  padding: 10px 6px 2px;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.topic-quote {
  margin: 30px 0;
  padding: 26px 30px;
  text-align: center;
  font-size: 21px;
  font-style: italic;
  color: var(--text);
  border-top: 1px solid rgba(217,184,124,0.4);
  border-bottom: 1px solid rgba(217,184,124,0.4);
  background: radial-gradient(600px 160px at 50% 0%, rgba(225,29,72,0.12), transparent 75%);
}

.topic-steps {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  counter-reset: topicstep;
}

.topic-steps li {
  counter-increment: topicstep;
  position: relative;
  padding: 0 0 20px 64px;
  color: #D1D5DB;
}

.topic-steps li::before {
  content: counter(topicstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--brass-hi);
  border: 1px solid var(--brass-2);
  border-radius: 4px;
  background:
    repeating-conic-gradient(from 0deg, rgba(176,141,87,0.25) 0deg 6deg, transparent 6deg 30deg),
    radial-gradient(circle, #1F2937 0 60%, #17202F 100%);
}

@media (max-width: 900px) {
  .topic-shell {
    grid-template-columns: 1fr;
    gap: 26px;
  }
  .topic-rail {
    position: static;
    order: 2;
  }
  .topic-content { order: 1; }
  .topic-band-grid { grid-template-columns: 1fr; }
  .topic-band { margin-left: 0; margin-right: 0; }
  .topic-mosaic { grid-template-columns: 1fr; }
  .topic-table { font-size: 12.5px; }
}