diff --git a/src/revoice/generate.py b/src/revoice/generate.py
index 37cf25e..b2b0b51 100644
--- a/src/revoice/generate.py
+++ b/src/revoice/generate.py
@@ -224,6 +224,48 @@ def _looks_like_site_footer(line: str) -> bool:
     return False
 
 
+def _looks_like_navigation_heavy_source(text: str) -> bool:
+    """
+    Heuristic to detect HTML→MD dumps where navigation dominates the payload
+    (e.g., long menus, repeated link lists, "Skip to content", JS void links).
+    This is used only for mirror-completeness scoring (not for content edits).
+    """
+    raw_lines = [ln.strip() for ln in (text or "").splitlines() if ln.strip()]
+    if len(raw_lines) < 40:
+        return False
+
+    linkish = 0
+    js_void = 0
+    for ln in raw_lines[:400]:
+        low = ln.lower()
+        if "javascript:void" in low:
+            js_void += 1
+        if "](" in ln or low.startswith("http://") or low.startswith("https://"):
+            linkish += 1
+
+    link_ratio = linkish / max(1, min(len(raw_lines), 400))
+    if js_void >= 1 and link_ratio >= 0.25:
+        return True
+    if link_ratio >= 0.45:
+        return True
+
+    nav_markers = (
+        "skip to content",
+        "skip to main content",
+        "search search",
+        "menu",
+        "column one",
+        "column two",
+        "column three",
+        "all rights reserved",
+        "cookie",
+        "privacy",
+        "terms",
+    )
+    marker_hits = sum(1 for ln in raw_lines[:220] if any(m in ln.lower() for m in nav_markers))
+    return marker_hits >= 6
+
+
 def _extract_urls(text: str) -> list[str]:
     urls: list[str] = []
     for match in _URL_RE.finditer(text):
@@ -3468,9 +3510,26 @@ def _generate_dave_v1_8_mirror(*, source_text: str, source_path: str, action_pac
     # Minimum content contract: mark degraded (and optionally gate-fail) instead of silently shipping emptiness.
     non_empty_sections = [s for s in sections[1:] if (s.body or "").strip()]
     total_body_chars = sum(len((s.body or "").strip()) for s in non_empty_sections)
-    mirror_ok = len(non_empty_sections) >= 3 and total_body_chars >= 3000
+    # Mirror completeness is relative to source size: two-page briefs shouldn't be forced into 3+ sections.
+    pages = _parse_pages(normalized)
+    non_empty_pages = sum(1 for _no, p in pages if (p or "").strip())
+    page_count = max(1, non_empty_pages)
+    min_sections_required = min(3, max(1, page_count - 1))
+    min_chars_required = min(3000, max(800, page_count * 800))
+
+    frame_blocked = "unauthorized frame window" in normalized.lower()
+    nav_heavy = _looks_like_navigation_heavy_source(source_text)
+
+    mirror_ok = (not frame_blocked) and (not nav_heavy) and (len(non_empty_sections) >= min_sections_required) and (total_body_chars >= min_chars_required)
     mirror_status = "OK" if mirror_ok else "DEGRADED"
-    mirror_reason = "" if mirror_ok else "INSUFFICIENT_MIRROR"
+    if mirror_ok:
+        mirror_reason = ""
+    elif frame_blocked:
+        mirror_reason = "FRAME_BLOCKED_SOURCE"
+    elif nav_heavy:
+        mirror_reason = "NAVIGATION_HEAVY_SOURCE"
+    else:
+        mirror_reason = "INSUFFICIENT_MIRROR"
     if _truthy_env("REVOICE_QUALITY_GATE") and not mirror_ok:
         raise ValueError(f"QUALITY_GATE_FAILED:{mirror_reason}")