.gate-explainer-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a0f1ed1;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:1050;display:flex;align-items:center;justify-content:center;padding:20px}.gate-explainer-window{width:100%;max-width:620px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);display:flex;flex-direction:column;box-shadow:0 24px 48px #00000080;overflow:hidden}.gate-explainer-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--color-surface-2);border-bottom:1px solid var(--color-border)}.gate-explainer-badge-row{display:flex;align-items:center;gap:12px}.gate-explainer-symbol{width:42px;height:42px;border-radius:var(--radius-md);background:var(--color-primary-dim);border:1px solid var(--color-primary);color:var(--color-primary);display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-weight:800;font-size:1.15rem}.gate-explainer-title{margin:0;font-size:1.05rem;font-weight:700;color:var(--color-text)}.gate-explainer-category{font-size:.72rem;color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.06em}.gate-explainer-body{padding:20px;display:flex;flex-direction:column;gap:16px;max-height:70vh;overflow-y:auto}.gate-explainer-section{display:flex;flex-direction:column;gap:6px}.gate-explainer-label{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-subtle)}.gate-explainer-desc{font-size:.84rem;color:var(--color-text);line-height:1.55;margin:0}.gate-explainer-matrix-box{background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:14px;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:.88rem;color:var(--color-accent)}.gate-explainer-rules-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.gate-explainer-rule-card{background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:10px 14px;display:flex;flex-direction:column;gap:2px}.gate-explainer-rule-title{font-size:.7rem;color:var(--color-text-muted)}.gate-explainer-rule-math{font-family:var(--font-mono);font-size:.84rem;font-weight:600;color:var(--color-primary)}.gate-explainer-bloch-box{background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:12px 16px;display:flex;align-items:center;gap:12px}.gate-explainer-bloch-icon{font-size:1.4rem}.gate-explainer-bloch-text{font-size:.78rem;color:var(--color-text-muted);line-height:1.45}.gate-explainer-footer{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;background:var(--color-surface-2);border-top:1px solid var(--color-border)}