#d2a-root {
  --bg: #fafbfc;
  --panel: #ffffff;
  --border: #e1e4e9;
  --text: #16181d;
  --muted: #6b7280;
  --accent: #2f5fed;
  --accent-soft: #eef1fe;
  --warn: #b45309;
  --warn-bg: #fff8ec;
  --mono: ui-monospace, "SF Mono", "Fira Code", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Arial, sans-serif;

  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  padding: 28px;
  box-sizing: border-box;
  min-height: 100%;
  border-radius: 8px;
}
#d2a-root * { box-sizing: border-box; }

.d2a-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 8px;
}
.d2a-header h1 {
  font-size: 18px;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}
.d2a-header p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 12.5px;
}
.d2a-target {
  font-size: 12px;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
}

.d2a-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 760px) {
  .d2a-grid { grid-template-columns: 1fr; }
}

.d2a-pane {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.d2a-pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.d2a-pane-head-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.d2a-btn {
  display: inline-block;
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  text-decoration: none;
}
.d2a-btn:hover { filter: brightness(1.08); }
.d2a-btn:disabled { background: var(--border); color: var(--muted); cursor: default; }

.d2a-btn-ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent-soft);
}

textarea#d2a-input {
  flex: 1;
  min-height: 380px;
  border: none;
  resize: vertical;
  padding: 14px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--text);
  outline: none;
}
pre#d2a-output {
  flex: 1;
  min-height: 380px;
  margin: 0;
  padding: 14px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  overflow: auto;
  white-space: pre;
  color: var(--text);
}

.d2a-warnings {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.d2a-warnings-head {
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.d2a-warning-row {
  padding: 8px 12px;
  font-size: 12.5px;
  font-family: var(--mono);
  background: var(--warn-bg);
  color: var(--warn);
  border-bottom: 1px solid var(--border);
}
.d2a-warning-row:last-child { border-bottom: none; }

.d2a-empty {
  color: var(--muted);
  font-size: 12.5px;
  padding: 14px;
  font-family: var(--sans);
}

.d2a-blog {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  max-width: 680px;
}
.d2a-blog h2 {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}
.d2a-blog h3 {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 20px 0 8px;
}
.d2a-blog h3:first-of-type {
  margin-top: 0;
}
.d2a-blog p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text);
}
.d2a-blog code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 1px 5px;
  border-radius: 4px;
}