diff --git a/docs/environment-variables.md b/docs/environment-variables.md
index bd3a05b0..5b61ad0e 100644
--- a/docs/environment-variables.md
+++ b/docs/environment-variables.md
@@ -31,7 +31,7 @@ This document lists all configuration options that can be set via environment va
 
 ## Bootstrap Configuration
 
-These environment variables are used at startup before the settings system loads. They typically configure paths and server settings.
+These environment variables are used at startup before the settings system loads. They typically configure paths, server settings, and authentication startup behavior.
 
 | Variable | Description | Type | Default |
 |----------|-------------|------|---------|
@@ -43,6 +43,9 @@ These environment variables are used at startup before the settings system loads
 | `FLASK_PORT` | Port number for the Flask web server. | number | `8084` |
 | `SESSION_COOKIE_SECURE` | Enable secure cookies (requires HTTPS). | boolean | `false` |
 | `CWA_DB_PATH` | Path to the Calibre-Web database for authentication integration. | string (path) | `/auth/app.db` |
+| `HIDE_LOCAL_AUTH` | Hide the username/password login form when OIDC is active. | boolean | `false` |
+| `DISABLE_LOCAL_AUTH` | Disable username/password login and remove the local-admin prerequisite for OIDC. Implies HIDE_LOCAL_AUTH; with AUTH_METHOD=builtin, everyone is locked out until auth env vars are changed. | boolean | `false` |
+| `OIDC_AUTO_REDIRECT` | Automatically redirect to the OIDC provider instead of showing the login page. | boolean | `false` |
 | `DOCKERMODE` | Indicates the application is running inside a Docker container. | boolean | `false` |
 | `ONBOARDING` | Show the onboarding wizard on first run. Set to false to skip (useful for ephemeral storage). | boolean | `true` |
 
@@ -105,6 +108,27 @@ Path to the Calibre-Web database for authentication integration.
 - **Type:** string (path)
 - **Default:** `/auth/app.db`
 
+#### `HIDE_LOCAL_AUTH`
+
+Hide the username/password login form when OIDC is active.
+
+- **Type:** boolean
+- **Default:** `false`
+
+#### `DISABLE_LOCAL_AUTH`
+
+Disable username/password login and remove the local-admin prerequisite for OIDC. Implies HIDE_LOCAL_AUTH; with AUTH_METHOD=builtin, everyone is locked out until auth env vars are changed.
+
+- **Type:** boolean
+- **Default:** `false`
+
+#### `OIDC_AUTO_REDIRECT`
+
+Automatically redirect to the OIDC provider instead of showing the login page.
+
+- **Type:** boolean
+- **Default:** `false`
+
 #### `DOCKERMODE`
 
 Indicates the application is running inside a Docker container.
@@ -1073,6 +1097,7 @@ How long to cache individual book details. Default: 600 (10 minutes). Max: 60480
 | `PROWLARR_API_KEY` | Found in Prowlarr: Settings > General > API Key | string (secret) | _none_ |
 | `PROWLARR_INDEXERS` | Select which indexers to search. 📚 = has book categories. Leave empty to search all. | string (comma-separated) | _empty list_ |
 | `PROWLARR_AUTO_EXPAND` | Automatically retry search without category filtering if no results are found | boolean | `false` |
+| `PROWLARR_USE_SEED_PREFERENCES` | Apply per-indexer seed time and ratio preferences from Prowlarr when sending torrents to the download client | boolean | `false` |
 
 <details>
 <summary>Detailed descriptions</summary>
@@ -1124,6 +1149,15 @@ Automatically retry search without category filtering if no results are found
 - **Type:** boolean
 - **Default:** `false`
 
+#### `PROWLARR_USE_SEED_PREFERENCES`
+
+**Use Prowlarr seed preferences**
+
+Apply per-indexer seed time and ratio preferences from Prowlarr when sending torrents to the download client
+
+- **Type:** boolean
+- **Default:** `false`
+
 </details>
 
 ## Newznab
diff --git a/docs/oidc.md b/docs/oidc.md
index ec5ecfd1..0c3982ed 100644
--- a/docs/oidc.md
+++ b/docs/oidc.md
@@ -39,9 +39,10 @@ These optional environment variables control login page behavior when OIDC is en
 | Variable | Description | Default |
 |----------|-------------|---------|
 | `HIDE_LOCAL_AUTH` | Hide the username/password login option, so only the OIDC button is shown | `false` |
+| `DISABLE_LOCAL_AUTH` | Disable username/password login and remove the local-admin prerequisite for OIDC. Implies `HIDE_LOCAL_AUTH`; with `AUTH_METHOD=builtin`, everyone is locked out until auth env vars are changed. | `false` |
 | `OIDC_AUTO_REDIRECT` | Automatically redirect to the OIDC provider instead of showing the login page | `false` |
 
-If both are enabled, users are redirected straight to the OIDC provider. On failure they return to the login page with an error message but no password fallback.
+If `DISABLE_LOCAL_AUTH` and `OIDC_AUTO_REDIRECT` are both enabled, users are redirected straight to the OIDC provider. On failure they return to the login page with an error message but no password fallback.
 
 ## Troubleshooting
 
diff --git a/scripts/generate_env_docs.py b/scripts/generate_env_docs.py
index 2907166e..bbee1cbf 100755
--- a/scripts/generate_env_docs.py
+++ b/scripts/generate_env_docs.py
@@ -172,6 +172,24 @@ def _generate_bootstrap_env_docs() -> list[str]:
             "type": "string (path)",
             "default": "/auth/app.db",
         },
+        {
+            "name": "HIDE_LOCAL_AUTH",
+            "description": "Hide the username/password login form when OIDC is active.",
+            "type": "boolean",
+            "default": "false",
+        },
+        {
+            "name": "DISABLE_LOCAL_AUTH",
+            "description": "Disable username/password login and remove the local-admin prerequisite for OIDC. Implies HIDE_LOCAL_AUTH; with AUTH_METHOD=builtin, everyone is locked out until auth env vars are changed.",
+            "type": "boolean",
+            "default": "false",
+        },
+        {
+            "name": "OIDC_AUTO_REDIRECT",
+            "description": "Automatically redirect to the OIDC provider instead of showing the login page.",
+            "type": "boolean",
+            "default": "false",
+        },
         {
             "name": "DOCKERMODE",
             "description": "Indicates the application is running inside a Docker container.",
@@ -189,7 +207,7 @@ def _generate_bootstrap_env_docs() -> list[str]:
     lines = [
         "## Bootstrap Configuration",
         "",
-        "These environment variables are used at startup before the settings system loads. They typically configure paths and server settings.",
+        "These environment variables are used at startup before the settings system loads. They typically configure paths, server settings, and authentication startup behavior.",
         "",
         "| Variable | Description | Type | Default |",
         "|----------|-------------|------|---------|",
diff --git a/shelfmark/config/env.py b/shelfmark/config/env.py
index 7900df5c..8eda0486 100644
--- a/shelfmark/config/env.py
+++ b/shelfmark/config/env.py
@@ -121,6 +121,7 @@ SESSION_COOKIE_SECURE_ENV = os.getenv("SESSION_COOKIE_SECURE", "false")
 SESSION_COOKIE_NAME = "shelfmark_session"
 CWA_DB_PATH = _resolve_cwa_db_path()
 HIDE_LOCAL_AUTH = string_to_bool(os.getenv("HIDE_LOCAL_AUTH", "false"))
+DISABLE_LOCAL_AUTH = string_to_bool(os.getenv("DISABLE_LOCAL_AUTH", "false"))
 OIDC_AUTO_REDIRECT = string_to_bool(os.getenv("OIDC_AUTO_REDIRECT", "false"))
 
 
diff --git a/shelfmark/config/security.py b/shelfmark/config/security.py
index 8a094fed..10f4cba5 100644
--- a/shelfmark/config/security.py
+++ b/shelfmark/config/security.py
@@ -76,7 +76,7 @@ def _test_oidc_connection(current_values: dict[str, Any] | None = None) -> dict[
 @register_settings("security", "Security", icon="shield", order=5)
 def security_settings() -> list[SettingsField]:
     """Security and authentication settings."""
-    from shelfmark.config.env import CWA_DB_PATH
+    from shelfmark.config.env import CWA_DB_PATH, DISABLE_LOCAL_AUTH
 
     cwa_db_available = CWA_DB_PATH is not None and CWA_DB_PATH.exists()
 
@@ -108,11 +108,17 @@ def security_settings() -> list[SettingsField]:
             ),
             show_when=_auth_condition("builtin"),
         ),
-        CustomComponentField(
-            key="oidc_admin_requirement",
-            component="oidc_admin_hint",
-            label="A local admin account is required before OIDC can be enabled.",
-            show_when=_auth_condition("oidc"),
+        *(
+            []
+            if DISABLE_LOCAL_AUTH
+            else [
+                CustomComponentField(
+                    key="oidc_admin_requirement",
+                    component="oidc_admin_hint",
+                    label="A local admin account is required before OIDC can be enabled.",
+                    show_when=_auth_condition("oidc"),
+                ),
+            ]
         ),
         *(
             []
diff --git a/shelfmark/config/security_handlers.py b/shelfmark/config/security_handlers.py
index df857810..990e25e3 100644
--- a/shelfmark/config/security_handlers.py
+++ b/shelfmark/config/security_handlers.py
@@ -4,6 +4,7 @@ import os
 from pathlib import Path
 from typing import TYPE_CHECKING, Any
 
+from shelfmark.config.env import DISABLE_LOCAL_AUTH
 from shelfmark.core.user_db import UserDB
 from shelfmark.core.utils import normalize_http_url
 from shelfmark.download.network import get_ssl_verify
@@ -78,7 +79,7 @@ def on_save_security(
     auth_method = str(effective_values.get("AUTH_METHOD", "") or "").strip().lower()
 
     if auth_method == "oidc":
-        if not _has_local_password_admin():
+        if not DISABLE_LOCAL_AUTH and not _has_local_password_admin():
             return {"error": True, "message": _OIDC_LOCKOUT_MESSAGE, "values": normalized_values}
 
         missing_fields = _get_missing_oidc_required_fields(effective_values)
diff --git a/shelfmark/core/auth_modes.py b/shelfmark/core/auth_modes.py
index fe4ce155..81c81948 100644
--- a/shelfmark/core/auth_modes.py
+++ b/shelfmark/core/auth_modes.py
@@ -71,14 +71,16 @@ def determine_auth_mode(
     cwa_db_path: object | None,
     *,
     has_local_admin: bool = True,
+    disable_local_auth: bool = False,
 ) -> str:
     """Determine active auth mode from security config and runtime prerequisites."""
     auth_mode = security_config.get("AUTH_METHOD", "none")
+    local_admin_available = has_local_admin or disable_local_auth
 
     if auth_mode == AUTH_SOURCE_CWA and cwa_db_path:
         return AUTH_SOURCE_CWA
 
-    if auth_mode == AUTH_SOURCE_BUILTIN and has_local_admin:
+    if auth_mode == AUTH_SOURCE_BUILTIN and local_admin_available:
         return AUTH_SOURCE_BUILTIN
 
     if auth_mode == AUTH_SOURCE_PROXY and security_config.get("PROXY_AUTH_USER_HEADER"):
@@ -86,7 +88,7 @@ def determine_auth_mode(
 
     if (
         auth_mode == AUTH_SOURCE_OIDC
-        and has_local_admin
+        and local_admin_available
         and security_config.get("OIDC_DISCOVERY_URL")
         and security_config.get("OIDC_CLIENT_ID")
     ):
@@ -102,6 +104,7 @@ def load_active_auth_mode(
 ) -> str:
     """Resolve active auth mode using current security config and runtime prerequisites."""
     try:
+        from shelfmark.config.env import DISABLE_LOCAL_AUTH
         from shelfmark.core.config import config as app_config
 
         security_config = {
@@ -114,6 +117,7 @@ def load_active_auth_mode(
             security_config,
             cwa_db_path,
             has_local_admin=has_local_password_admin(user_db),
+            disable_local_auth=DISABLE_LOCAL_AUTH,
         )
     except ImportError, OSError, RuntimeError, TypeError, ValueError, sqlite3.Error:
         return "none"
diff --git a/shelfmark/main.py b/shelfmark/main.py
index 81d0a692..85a125a5 100644
--- a/shelfmark/main.py
+++ b/shelfmark/main.py
@@ -26,6 +26,7 @@ from shelfmark.config.env import (
     BUILD_VERSION,
     CONFIG_DIR,
     CWA_DB_PATH,
+    DISABLE_LOCAL_AUTH,
     FLASK_HOST,
     FLASK_PORT,
     HIDE_LOCAL_AUTH,
@@ -1956,6 +1957,9 @@ def api_login() -> Response | tuple[Response, int]:
         if auth_mode == "proxy":
             return jsonify({"error": "Proxy authentication is enabled"}), 401
 
+        if auth_mode in ("builtin", "oidc") and DISABLE_LOCAL_AUTH:
+            return jsonify({"error": "Local authentication is disabled"}), 403
+
         if auth_mode == "oidc" and HIDE_LOCAL_AUTH:
             return jsonify({"error": "Local authentication is disabled"}), 403
 
@@ -2185,6 +2189,9 @@ def api_auth_check() -> Response | tuple[Response, int]:
             if logout_url:
                 response_data["logout_url"] = logout_url
 
+        if auth_mode in ("builtin", "oidc") and DISABLE_LOCAL_AUTH:
+            response_data["hide_local_auth"] = True
+
         # Add custom OIDC button label and SSO enforcement flags if configured
         if auth_mode == "oidc":
             oidc_button_label = app_config.get("OIDC_BUTTON_LABEL", "")
diff --git a/src/frontend/src/components/settings/customFields/OidcEnvInfo.tsx b/src/frontend/src/components/settings/customFields/OidcEnvInfo.tsx
index 57c71475..50dfd7d0 100644
--- a/src/frontend/src/components/settings/customFields/OidcEnvInfo.tsx
+++ b/src/frontend/src/components/settings/customFields/OidcEnvInfo.tsx
@@ -18,6 +18,10 @@ export const OidcEnvInfo = (_props: CustomSettingsFieldRendererProps) => {
           {'    '}
           <span className="opacity-40"># Hide the local login form</span>
           {'\n'}
+          {'  '}- <span className="text-blue-400">DISABLE_LOCAL_AUTH</span>=
+          <span className="text-green-400">true</span>{' '}
+          <span className="opacity-40"># Disable username/password login</span>
+          {'\n'}
           {'  '}- <span className="text-blue-400">OIDC_AUTO_REDIRECT</span>=
           <span className="text-green-400">true</span>
           {'  '}
diff --git a/tests/config/test_security.py b/tests/config/test_security.py
index 3226f35a..e2766ed0 100644
--- a/tests/config/test_security.py
+++ b/tests/config/test_security.py
@@ -381,6 +381,16 @@ class TestSecuritySettings:
         assert "inactive" in hint.label.lower()
         assert "local admin" in hint.label.lower()
 
+    def test_oidc_admin_requirement_hint_absent_when_local_auth_is_disabled(self):
+        """OIDC mode should not show the local-admin warning when local auth is disabled."""
+        from shelfmark.config.security import security_settings
+
+        with patch("shelfmark.config.env.DISABLE_LOCAL_AUTH", True):
+            fields = security_settings()
+
+        hint = next((f for f in fields if f.key == "oidc_admin_requirement"), None)
+        assert hint is None
+
     def test_builtin_option_label_is_local(self):
         """Builtin auth option should be labeled Local."""
         from shelfmark.config.security import security_settings
@@ -429,6 +439,28 @@ class TestSecurityOnSave:
         assert result["error"] is True
         assert "local admin" in result["message"].lower()
 
+    def test_on_save_allows_oidc_without_local_admin_when_local_auth_is_disabled(
+        self, tmp_path, monkeypatch
+    ):
+        from shelfmark.config.security import _on_save_security
+
+        _set_config_dir(monkeypatch, tmp_path)
+        UserDB(str(tmp_path / "users.db")).initialize()
+
+        with patch("shelfmark.config.security_handlers.DISABLE_LOCAL_AUTH", True):
+            result = _on_save_security(
+                {
+                    "AUTH_METHOD": "oidc",
+                    "OIDC_DISCOVERY_URL": (
+                        "https://auth.example.com/.well-known/openid-configuration"
+                    ),
+                    "OIDC_CLIENT_ID": "shelfmark",
+                    "OIDC_CLIENT_SECRET": "secret123",
+                }
+            )
+
+        assert result["error"] is False
+
     def test_on_save_blocks_oidc_when_client_id_is_missing(self, tmp_path, monkeypatch):
         from shelfmark.config.security import _on_save_security
 
diff --git a/tests/core/test_auth_api.py b/tests/core/test_auth_api.py
index 4ee00560..dd30fc36 100644
--- a/tests/core/test_auth_api.py
+++ b/tests/core/test_auth_api.py
@@ -126,6 +126,21 @@ class TestLoginSemantics:
         assert response.status_code == 403
         assert response.get_json()["error"] == "Local authentication is disabled"
 
+    @pytest.mark.parametrize("auth_mode", ["builtin", "oidc"])
+    def test_login_rejects_password_auth_when_local_auth_is_disabled(
+        self, main_module, client, auth_mode
+    ):
+        with patch.object(main_module, "get_auth_mode", return_value=auth_mode):
+            with patch.object(main_module, "DISABLE_LOCAL_AUTH", True):
+                response = client.post(
+                    "/api/auth/login",
+                    json={"username": "alice", "password": "wrong", "remember_me": False},
+                )
+
+        assert response.status_code == 403
+        assert response.get_json()["error"] == "Local authentication is disabled"
+        assert main_module.failed_login_attempts == {}
+
     def test_auth_check_none_mode_reports_full_access(self, main_module, client):
         with patch.object(main_module, "get_auth_mode", return_value="none"):
             response = client.get("/api/auth/check")
@@ -138,6 +153,19 @@ class TestLoginSemantics:
             "is_admin": True,
         }
 
+    @pytest.mark.parametrize("auth_mode", ["builtin", "oidc"])
+    def test_auth_check_hides_local_auth_when_disabled(self, main_module, client, auth_mode):
+        with patch.object(main_module, "get_auth_mode", return_value=auth_mode):
+            with patch.object(main_module, "DISABLE_LOCAL_AUTH", True):
+                response = client.get("/api/auth/check")
+
+        assert response.status_code == 200
+        body = response.get_json()
+        assert body["auth_mode"] == auth_mode
+        assert body["auth_required"] is True
+        assert body["authenticated"] is False
+        assert body["hide_local_auth"] is True
+
     def test_auth_check_includes_display_name_for_authenticated_user(
         self, main_module, client, temp_user_db, monkeypatch
     ):
diff --git a/tests/core/test_oidc_integration.py b/tests/core/test_oidc_integration.py
index ef841f64..8a26b901 100644
--- a/tests/core/test_oidc_integration.py
+++ b/tests/core/test_oidc_integration.py
@@ -2,6 +2,8 @@
 
 import sqlite3
 
+import pytest
+
 from shelfmark.core.auth_modes import (
     determine_auth_mode,
     get_auth_check_admin_status,
@@ -63,6 +65,31 @@ class TestDetermineAuthMode:
         }
         assert determine_auth_mode(config, cwa_db_path=None, has_local_admin=False) == "none"
 
+    @pytest.mark.parametrize(
+        ("auth_mode", "config"),
+        [
+            ("builtin", {"AUTH_METHOD": "builtin"}),
+            (
+                "oidc",
+                {
+                    "AUTH_METHOD": "oidc",
+                    "OIDC_DISCOVERY_URL": "https://auth.example.com/.well-known/openid-configuration",
+                    "OIDC_CLIENT_ID": "shelfmark",
+                },
+            ),
+        ],
+    )
+    def test_disable_local_auth_keeps_configured_mode_without_admin(self, auth_mode, config):
+        assert (
+            determine_auth_mode(
+                config,
+                cwa_db_path=None,
+                has_local_admin=False,
+                disable_local_auth=True,
+            )
+            == auth_mode
+        )
+
     def test_load_active_auth_mode_reads_env_backed_cwa_setting(self, monkeypatch, tmp_path):
         from shelfmark.core.config import config as app_config