:root {
  --cir-bg: #eef2f7;
  --cir-card: #fff;
  --cir-text: #152033;
  --cir-muted: #5c6b82;
  --cir-line: #d5deea;
  --cir-accent: #2563eb;
  --cir-soft: #dbeafe;
  --sans: "Source Sans 3", system-ui, sans-serif;
  --mono: "Source Code Pro", ui-monospace, monospace;
  --radius: 12px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: var(--sans); background: var(--cir-bg); color: var(--cir-text); line-height: 1.55; min-height: 100vh; }
.shell-cir-app { padding-bottom: 2rem; }
.shell-cir-top { max-width: 1100px; margin: 0 auto; padding: 1.75rem 1.5rem 1rem; }
.shell-cir-brand { font-size: 0.72rem; letter-spacing: 0.18em; font-weight: 700; text-transform: uppercase; color: var(--cir-muted); display: flex; gap: 0.5rem; align-items: center; }
.shell-cir-mark { color: var(--cir-accent); font-size: 1.1rem; letter-spacing: 0; }
.shell-cir-nav { display: flex; gap: 1rem; margin: 0.75rem 0; flex-wrap: wrap; }
.shell-cir-nav a { color: var(--cir-muted); text-decoration: none; font-size: 0.9rem; }
.shell-cir-top h1 { margin: 0.2rem 0; font-size: 1.65rem; }
.shell-cir-intro { color: var(--cir-muted); margin: 0 0 0.5rem; }
.shell-cir-workspace { max-width: 1100px; margin: 0 auto 2rem; padding: 0 1.5rem; display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 800px) { .shell-cir-workspace { grid-template-columns: 1fr; } }
.shell-cir-panel { background: var(--cir-card); border: 1px solid var(--cir-line); border-radius: var(--radius); padding: 1rem; display: flex; flex-direction: column; gap: 0.55rem; min-height: 320px; }
.shell-cir-panel label { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--cir-muted); }
.shell-cir-panel textarea, .shell-cir-panel pre { flex: 1; width: 100%; margin: 0; border: 1px solid var(--cir-line); border-radius: 8px; padding: 0.75rem; font-family: var(--mono); font-size: 0.8rem; background: #f8fafc; color: var(--cir-text); white-space: pre-wrap; }
.shell-cir-flags label { display: flex; gap: 0.4rem; align-items: center; font-size: 0.85rem; font-weight: 500; text-transform: none; letter-spacing: 0; color: var(--cir-text); margin: 0.25rem 0; }
.shell-cir-sdk { font-size: 0.85rem; background: var(--cir-soft); border-radius: 8px; padding: 0.65rem 0.75rem; color: #1e3a8a; }
.shell-cir-panel .accent { align-self: flex-start; background: var(--cir-accent); color: #fff; border: 0; font-weight: 700; padding: 0.5rem 1rem; border-radius: 8px; cursor: pointer; font: inherit; margin-right: 0.35rem; }

.matrix-prose{color:var(--cir-muted);font-size:.92rem}
.matrix-prose h2{color:var(--cir-text)}
.matrix-prose a{color:var(--cir-accent)}
.matrix-prose code{font-family:var(--mono);font-size:.85em}