:root {
  --dd-btc-blue: #3659a5;
  --dd-btc-blue-dark: #294889;
  --dd-btc-panel: #f7f7f8;
  --dd-btc-line: rgba(31, 39, 51, 0.14);
  --dd-btc-ink: #111827;
  --dd-btc-muted: #4b5563;
}

.dd-btc {
  display: grid;
  gap: 1.35rem;
  color: var(--dd-btc-ink);
  font-family: var(--theme-font-family-sans);
}

.dd-btc-header,
.dd-btc-card {
  border: 1px solid var(--dd-btc-line);
  border-radius: 0.75rem;
}

.dd-btc-header {
  background: #fff;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.dd-btc-kicker {
  margin: 0 0 0.5rem;
  color: var(--dd-btc-blue);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.dd-btc-header h2,
.dd-btc-card h3 {
  margin: 0;
  font-family: var(--theme-font-family-sans);
}

.dd-btc-header h2 {
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.08;
}

.dd-btc-header p:last-child {
  max-width: 62rem;
  margin: 0.7rem 0 0;
  color: var(--dd-btc-muted);
  font-size: 1rem;
  line-height: 1.55;
}

.dd-btc-layout {
  display: grid;
  grid-template-columns: minmax(18rem, 0.9fr) minmax(24rem, 1.2fr);
  gap: 1.2rem;
}

.dd-btc-card {
  overflow: hidden;
  background: var(--dd-btc-panel);
}

.dd-btc-diagram-card {
  background: #fff;
}

.dd-btc-diagram-card img {
  display: block;
  width: min(100%, 72rem);
  height: auto;
  margin: 0 auto;
  padding: clamp(0.75rem, 2vw, 1.25rem);
}

.dd-btc-card-header {
  border-bottom: 1px solid var(--dd-btc-line);
  background: #fff;
  padding: 1rem 1.1rem;
}

.dd-btc-card h3 {
  color: var(--dd-btc-blue-dark);
  font-size: 1rem;
  font-weight: 800;
}

.dd-btc-form {
  display: grid;
  gap: 0.9rem;
  padding: 1.1rem;
}

.dd-btc-form label {
  display: grid;
  gap: 0.35rem;
}

.dd-btc-form span {
  color: var(--dd-btc-muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.dd-btc-form select,
.dd-btc-form input {
  min-height: 2.8rem;
  width: 100%;
  border: 1px solid rgba(31, 39, 51, 0.18);
  border-radius: 0.6rem;
  background: #fff;
  color: var(--dd-btc-ink);
  padding: 0.62rem 0.75rem;
}

.dd-btc-table-wrap {
  overflow-x: auto;
}

.dd-btc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.dd-btc-table th,
.dd-btc-table td {
  border-bottom: 1px solid var(--dd-btc-line);
  padding: 0.72rem 0.85rem;
  text-align: left;
  vertical-align: top;
}

.dd-btc-table thead th {
  background: #fff;
  color: var(--dd-btc-blue-dark);
  font-size: 0.875rem;
  text-transform: uppercase;
}

.dd-btc-table tbody th {
  width: 34%;
  color: var(--dd-btc-muted);
  font-size: 0.875rem;
  text-transform: uppercase;
}

.dd-btc-table td {
  width: 33%;
}

.dd-btc-bibliography {
  display: grid;
  gap: 1rem;
  border: 1px solid var(--dd-btc-line);
  border-radius: 0.75rem;
  background: #fff;
  padding: clamp(1rem, 2vw, 1.35rem);
}

.dd-btc-bibliography article {
  display: grid;
  gap: 0.55rem;
}

.dd-btc-bibliography h3 {
  margin: 0;
  color: var(--dd-btc-blue-dark);
  font-size: 0.95rem;
  font-weight: 800;
}

.dd-btc-bibliography ol,
.dd-btc-bibliography ul {
  display: grid;
  gap: 0.42rem;
  margin: 0;
  padding-left: 1.25rem;
  color: var(--dd-btc-muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.dd-btc-bibliography p {
  margin: 0;
  color: var(--dd-btc-muted);
  font-size: 0.84rem;
  line-height: 1.45;
}

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

@media (max-width: 720px) {
  .dd-btc-header,
  .dd-btc-card-header,
  .dd-btc-form {
    padding: 0.95rem;
  }

  .dd-btc-header h2 {
    font-size: 1.8rem;
  }

  .dd-btc-table {
    font-size: 0.84rem;
  }
}