.layout-keystage {}
.keystage-shell { background:linear-gradient(180deg,#f8fafc,#e2e8f0); }
.keystage-keys { display:flex; gap:2px; margin:0 0 16px; }
.keystage-keys span { flex:1; height:28px; background:#1e293b; border-radius:0 0 4px 4px; }
.keystage-keys span:nth-child(even) { flex:0.6; height:18px; background:#334155; }
.keystage-footer { background:#1e293b; color:#f8fafc; padding:20px 16px 40px; }

.keystage-main { width: min(var(--content-max-width), calc(100% - 32px)); margin: 0 auto; padding-bottom: 40px; }
.keystage-main a { color: var(--theme-primary); }
.keystage-intro { margin: 24px 0; }
.keystage-intro h2 { font-family: var(--font-display); margin: 0 0 8px; }
.keystage-about { margin-top: 32px; padding: 20px; border: 1px solid var(--border-color); background: var(--theme-card); }
.keystage-tag { margin: 8px 0 0; font-size: 0.85rem; color: var(--text-muted); }
.keystage-shell h1 a, .keystage-shell .brand-title a { text-decoration: none; color: inherit; }