diff --git a/CLAUDE.md b/CLAUDE.md
index 0dabec2..cf98ec2 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -37,6 +37,20 @@ This is self-driving software. All changes must be deliberate and well-understoo
 - **Test everything thoroughly** — Brian must always be in the loop
 - **Do not refactor, clean up, or "improve" code beyond the specific request**
 
+### Logging
+
+**NEVER use `cloudlog`.** It's comma.ai's cloud telemetry pipeline, not ours — writes go to a publisher that's effectively a black hole for us (and the only thing it could do if ever reachable is bother the upstream FrogPilot developer). Our changes must always use **file logging** instead.
+
+Use `print(..., file=sys.stderr, flush=True)`. `manager.py` redirects each managed process's stderr to `/data/log2/current/{process}.log`, so these lines land in the per-process log we already grep. Prefix custom log lines with `CLP ` so they're easy to filter out from upstream noise.
+
+Example:
+```python
+import sys
+print(f"CLP frogpilotPlan valid=False: carState_freq_ok={sm.freq_ok['carState']}", file=sys.stderr, flush=True)
+```
+
+Do not use `cloudlog.warning`, `cloudlog.info`, `cloudlog.error`, `cloudlog.event`, or `cloudlog.exception` in any CLEARPILOT-added code. Existing upstream/FrogPilot `cloudlog` calls can stay untouched.
+
 ### File Ownership
 
 We operate as `root` on this device, but openpilot runs as the `comma` user (uid=1000, gid=1000). After any code changes that touch multiple files or before testing:
diff --git a/selfdrive/clearpilot/dashcamd b/selfdrive/clearpilot/dashcamd
index 9a756bc..be3cc3a 100755
Binary files a/selfdrive/clearpilot/dashcamd and b/selfdrive/clearpilot/dashcamd differ
diff --git a/selfdrive/controls/lib/longitudinal_planner.py b/selfdrive/controls/lib/longitudinal_planner.py
index d86108a..fbcad91 100755
--- a/selfdrive/controls/lib/longitudinal_planner.py
+++ b/selfdrive/controls/lib/longitudinal_planner.py
@@ -145,6 +145,7 @@ class LongitudinalPlanner:
 
     # CLEARPILOT: track model FPS for dynamic dt adjustment
     self.model_fps = 20
+    self._dbg_prev_valid = True  # CLEARPILOT: diagnostic logging on valid transitions
 
     self.radarless_model = self.params.get("Model", encoding='utf-8') in RADARLESS_MODELS
 
@@ -277,7 +278,18 @@ class LongitudinalPlanner:
   def publish(self, sm, pm):
     plan_send = messaging.new_message('longitudinalPlan')
 
-    plan_send.valid = sm.all_checks(service_list=['carState', 'controlsState'])
+    valid = sm.all_checks(service_list=['carState', 'controlsState'])
+    # CLEARPILOT: log on transition into invalid — stderr goes to our plannerd.log
+    if valid != self._dbg_prev_valid and not valid:
+      import sys
+      print(
+        "CLP longitudinalPlan valid=False: "
+        f"carState(a={sm.alive['carState']},v={sm.valid['carState']},f={sm.freq_ok['carState']}) "
+        f"controlsState(a={sm.alive['controlsState']},v={sm.valid['controlsState']},f={sm.freq_ok['controlsState']})",
+        file=sys.stderr, flush=True
+      )
+    self._dbg_prev_valid = valid
+    plan_send.valid = valid
 
     longitudinalPlan = plan_send.longitudinalPlan
     longitudinalPlan.modelMonoTime = sm.logMonoTime['modelV2']
diff --git a/selfdrive/frogpilot/controls/frogpilot_planner.py b/selfdrive/frogpilot/controls/frogpilot_planner.py
index 78bf726..a04c4bf 100755
--- a/selfdrive/frogpilot/controls/frogpilot_planner.py
+++ b/selfdrive/frogpilot/controls/frogpilot_planner.py
@@ -58,6 +58,9 @@ class FrogPilotPlanner:
     self.params = Params()
     self.params_memory = Params("/dev/shm/params")
 
+    # CLEARPILOT: track valid transitions so we only log when it flips, not every cycle
+    self._dbg_prev_valid = True
+
     self.cem = ConditionalExperimentalMode()
     self.lead_one = Lead()
     self.mtsc = MapTurnSpeedController()
@@ -242,7 +245,18 @@ class FrogPilotPlanner:
 
   def publish(self, sm, pm):
     frogpilot_plan_send = messaging.new_message('frogpilotPlan')
-    frogpilot_plan_send.valid = sm.all_checks(service_list=['carState', 'controlsState'])
+    valid = sm.all_checks(service_list=['carState', 'controlsState'])
+    # CLEARPILOT: log on transition into invalid — stderr goes to our plannerd.log
+    if valid != self._dbg_prev_valid and not valid:
+      import sys
+      print(
+        "CLP frogpilotPlan valid=False: "
+        f"carState(a={sm.alive['carState']},v={sm.valid['carState']},f={sm.freq_ok['carState']}) "
+        f"controlsState(a={sm.alive['controlsState']},v={sm.valid['controlsState']},f={sm.freq_ok['controlsState']})",
+        file=sys.stderr, flush=True
+      )
+    self._dbg_prev_valid = valid
+    frogpilot_plan_send.valid = valid
     frogpilotPlan = frogpilot_plan_send.frogpilotPlan
 
     frogpilotPlan.accelerationJerk = A_CHANGE_COST * (float(self.jerk) if self.lead_one.status else 1)
diff --git a/selfdrive/locationd/calibrationd.py b/selfdrive/locationd/calibrationd.py
index 6e154bf..3347861 100755
--- a/selfdrive/locationd/calibrationd.py
+++ b/selfdrive/locationd/calibrationd.py
@@ -263,6 +263,7 @@ def main() -> NoReturn:
   sm = messaging.SubMaster(['cameraOdometry', 'carState', 'carParams'], poll='cameraOdometry')
 
   calibrator = Calibrator(param_put=True)
+  dbg_prev_valid = True  # CLEARPILOT: track valid transitions
 
   while 1:
     timeout = 0 if sm.frame == -1 else 100
@@ -284,7 +285,15 @@ def main() -> NoReturn:
 
     # 4Hz driven by cameraOdometry
     if sm.frame % 5 == 0:
-      calibrator.send_data(pm, sm.all_checks())
+      cal_valid = sm.all_checks()
+      # CLEARPILOT: log per-sub detail on transition to invalid — goes to calibrationd.log
+      if cal_valid != dbg_prev_valid and not cal_valid:
+        import sys
+        bad = [s for s in sm.alive if not (sm.alive[s] and sm.valid[s] and sm.freq_ok.get(s, True))]
+        details = [f"{s}(a={sm.alive[s]},v={sm.valid[s]},f={sm.freq_ok[s]})" for s in bad]
+        print(f"CLP liveCalibration valid=False: {' '.join(details)}", file=sys.stderr, flush=True)
+      dbg_prev_valid = cal_valid
+      calibrator.send_data(pm, cal_valid)
 
 
 if __name__ == "__main__":
diff --git a/selfdrive/locationd/paramsd.py b/selfdrive/locationd/paramsd.py
index 0cfae89..7b57e71 100755
--- a/selfdrive/locationd/paramsd.py
+++ b/selfdrive/locationd/paramsd.py
@@ -187,6 +187,7 @@ def main():
   avg_offset_valid = True
   total_offset_valid = True
   roll_valid = True
+  dbg_prev_valid = True  # CLEARPILOT: track valid transitions
 
   while True:
     sm.update()
@@ -256,7 +257,15 @@ def main():
         liveParameters.filterState.std = P.tolist()
         liveParameters.filterState.valid = True
 
-      msg.valid = sm.all_checks()
+      lp_valid = sm.all_checks()
+      # CLEARPILOT: on transition to invalid, log per-subscriber state to paramsd.log
+      if lp_valid != dbg_prev_valid and not lp_valid:
+        import sys
+        bad = [s for s in sm.alive if not (sm.alive[s] and sm.valid[s] and sm.freq_ok.get(s, True))]
+        details = [f"{s}(a={sm.alive[s]},v={sm.valid[s]},f={sm.freq_ok[s]})" for s in bad]
+        print(f"CLP liveParameters valid=False: {' '.join(details)}", file=sys.stderr, flush=True)
+      dbg_prev_valid = lp_valid
+      msg.valid = lp_valid
 
       if sm.frame % 1200 == 0:  # once a minute
         params = {
diff --git a/selfdrive/locationd/torqued.py b/selfdrive/locationd/torqued.py
index 06f9044..98d0b29 100755
--- a/selfdrive/locationd/torqued.py
+++ b/selfdrive/locationd/torqued.py
@@ -226,6 +226,8 @@ def main(demo=False):
   with car.CarParams.from_bytes(params.get("CarParams", block=True)) as CP:
     estimator = TorqueEstimator(CP)
 
+  dbg_prev_valid = True  # CLEARPILOT: track valid transitions
+
   while True:
     sm.update()
     if sm.all_checks():
@@ -236,7 +238,15 @@ def main(demo=False):
 
     # 4Hz driven by liveLocationKalman
     if sm.frame % 5 == 0:
-      pm.send('liveTorqueParameters', estimator.get_msg(valid=sm.all_checks()))
+      tq_valid = sm.all_checks()
+      # CLEARPILOT: log per-sub detail on transition to invalid — goes to torqued.log
+      if tq_valid != dbg_prev_valid and not tq_valid:
+        import sys
+        bad = [s for s in sm.alive if not (sm.alive[s] and sm.valid[s] and sm.freq_ok.get(s, True))]
+        details = [f"{s}(a={sm.alive[s]},v={sm.valid[s]},f={sm.freq_ok[s]})" for s in bad]
+        print(f"CLP liveTorqueParameters valid=False: {' '.join(details)}", file=sys.stderr, flush=True)
+      dbg_prev_valid = tq_valid
+      pm.send('liveTorqueParameters', estimator.get_msg(valid=tq_valid))
 
     # Cache points every 60 seconds while onroad
     if sm.frame % 240 == 0:
diff --git a/selfdrive/monitoring/dmonitoringd.py b/selfdrive/monitoring/dmonitoringd.py
index 579e790..12addef 100755
--- a/selfdrive/monitoring/dmonitoringd.py
+++ b/selfdrive/monitoring/dmonitoringd.py
@@ -21,6 +21,7 @@ def dmonitoringd_thread():
 
   v_cruise_last = 0
   driver_engaged = False
+  dbg_prev_valid = True  # CLEARPILOT: track valid transitions
 
   # 10Hz <- dmonitoringmodeld
   while True:
@@ -54,8 +55,16 @@ def dmonitoringd_thread():
     # Update events from driver state
     driver_status.update_events(events, driver_engaged, sm['controlsState'].enabled, sm['carState'].standstill)
 
+    # CLEARPILOT: log on transition to invalid so we can see which sub caused the cascade
+    dm_valid = sm.all_checks()
+    if dm_valid != dbg_prev_valid and not dm_valid:
+      import sys
+      bad = [s for s in sm.alive if not (sm.alive[s] and sm.valid[s] and sm.freq_ok.get(s, True))]
+      details = [f"{s}(a={sm.alive[s]},v={sm.valid[s]},f={sm.freq_ok[s]})" for s in bad]
+      print(f"CLP driverMonitoringState valid=False: {' '.join(details)}", file=sys.stderr, flush=True)
+    dbg_prev_valid = dm_valid
     # build driverMonitoringState packet
-    dat = messaging.new_message('driverMonitoringState', valid=sm.all_checks())
+    dat = messaging.new_message('driverMonitoringState', valid=dm_valid)
     dat.driverMonitoringState = {
       "events": events.to_msg(),
       "faceDetected": driver_status.face_detected,
diff --git a/selfdrive/thermald/power_monitoring.py b/selfdrive/thermald/power_monitoring.py
index eb83e6f..3163ac2 100755
--- a/selfdrive/thermald/power_monitoring.py
+++ b/selfdrive/thermald/power_monitoring.py
@@ -36,8 +36,8 @@ class PowerMonitoring:
     # Reset capacity if it's low
     self.car_battery_capacity_uWh = max((CAR_BATTERY_CAPACITY_uWh / 10), int(car_battery_capacity_uWh))
 
-    # CLEARPILOT: hardcoded 10 minute shutdown timer (not user-configurable)
-    self.device_shutdown_time = 600
+    # CLEARPILOT: hardcoded 30 minute shutdown timer (not user-configurable)
+    self.device_shutdown_time = 1800
     self.low_voltage_shutdown = VBATT_PAUSE_CHARGING
 
   # Calculation tick
diff --git a/selfdrive/ui/qt/onroad.cc b/selfdrive/ui/qt/onroad.cc
index 1f1910b..8c786f2 100755
--- a/selfdrive/ui/qt/onroad.cc
+++ b/selfdrive/ui/qt/onroad.cc
@@ -858,12 +858,14 @@ void AnnotatedCameraWidget::drawLaneLines(QPainter &painter, const UIState *s) {
 
   // CLEARPILOT: nightrider lines are 1px wider (3 instead of 2)
   int outlineWidth = outlineOnly ? 3 : 2;
+  // CLEARPILOT: lane lines 5% thinner than the generic outline (QPen accepts float width)
+  float laneLineWidth = outlineOnly ? (float)outlineWidth * 0.95f : (float)outlineWidth;
 
   // lanelines
   for (int i = 0; i < std::size(scene.lane_line_vertices); ++i) {
     QColor lineColor = QColor::fromRgbF(1.0, 1.0, 1.0, std::clamp<float>(scene.lane_line_probs[i], 0.0, 0.7));
     if (outlineOnly) {
-      painter.setPen(QPen(lineColor, outlineWidth));
+      painter.setPen(QPen(lineColor, laneLineWidth));
       painter.setBrush(Qt::NoBrush);
     } else {
       painter.setPen(Qt::NoPen);
@@ -952,9 +954,11 @@ void AnnotatedCameraWidget::drawLaneLines(QPainter &painter, const UIState *s) {
     }
 
     if (outlineOnly) {
-      // CLEARPILOT: center path (tire track) is 2x wider than other lines in nightrider
-      painter.setPen(QPen(QColor(center_lane_color.red(), center_lane_color.green(),
-                                 center_lane_color.blue(), 180), outlineWidth * 2));
+      // CLEARPILOT: in nightrider, the tire path outline is light blue at 3px.
+      // Uses a fixed light-blue instead of center_lane_color (which is status-tinted) so
+      // the path reads as a neutral guide, not as engagement/status feedback.
+      QColor lightBlue(153, 204, 255, 220);  // #99CCFF light blue, mostly opaque
+      painter.setPen(QPen(lightBlue, 3));
       painter.setBrush(Qt::NoBrush);
     } else {
       painter.setPen(Qt::NoPen);
diff --git a/system/clearpilot/gpsd.py b/system/clearpilot/gpsd.py
index cf4f402..e74a9a1 100644
--- a/system/clearpilot/gpsd.py
+++ b/system/clearpilot/gpsd.py
@@ -20,17 +20,16 @@ from openpilot.common.time import system_time_valid
 from openpilot.system.hardware.tici.pins import GPIO
 
 
-def is_daylight(lat: float, lon: float, utc_dt: datetime.datetime) -> bool:
-  """Return True if it's between sunrise and sunset at the given location.
-  Uses NOAA simplified solar position equations. Pure math, no external libs."""
+def _sunrise_sunset_min(lat: float, lon: float, utc_dt: datetime.datetime):
+  """Compute (sunrise_min, sunset_min) in UTC minutes since midnight of utc_dt's day.
+  Values can be negative or >1440 for western/eastern longitudes. Returns
+  (None, None) for polar night, ('always', 'always') for midnight sun."""
   n = utc_dt.timetuple().tm_yday
   gamma = 2 * math.pi / 365 * (n - 1 + (utc_dt.hour - 12) / 24)
-  # Equation of time (minutes)
   eqtime = 229.18 * (0.000075 + 0.001868 * math.cos(gamma)
            - 0.032077 * math.sin(gamma)
            - 0.014615 * math.cos(2 * gamma)
            - 0.040849 * math.sin(2 * gamma))
-  # Solar declination (radians)
   decl = (0.006918 - 0.399912 * math.cos(gamma)
           + 0.070257 * math.sin(gamma)
           - 0.006758 * math.cos(2 * gamma)
@@ -42,14 +41,41 @@ def is_daylight(lat: float, lon: float, utc_dt: datetime.datetime) -> bool:
   cos_ha = (math.cos(zenith) / (math.cos(lat_rad) * math.cos(decl))
             - math.tan(lat_rad) * math.tan(decl))
   if cos_ha < -1:
-    return True   # midnight sun
+    return ('always', 'always')   # midnight sun
   if cos_ha > 1:
-    return False  # polar night
+    return (None, None)           # polar night
   ha = math.degrees(math.acos(cos_ha))
   sunrise_min = 720 - 4 * (lon + ha) - eqtime
   sunset_min = 720 - 4 * (lon - ha) - eqtime
+  return (sunrise_min, sunset_min)
+
+
+def is_daylight(lat: float, lon: float, utc_dt: datetime.datetime) -> bool:
+  """Return True if the sun is currently above the horizon at (lat, lon).
+
+  Handles west-of-Greenwich correctly: at UTC midnight it may still be
+  evening local time, and the relevant sunset is the PREVIOUS UTC day's
+  value (which is >1440 min if we re-ref to that day, i.e. it's past
+  midnight UTC). Symmetric case for east-of-Greenwich at the other end.
+
+  Strategy: compute sunrise/sunset for yesterday, today, and tomorrow (each
+  relative to its own UTC midnight), shift them all onto today's clock
+  (yesterday = -1440, tomorrow = +1440), and check if now_min falls inside
+  any of the three [sunrise, sunset] intervals.
+  """
   now_min = utc_dt.hour * 60 + utc_dt.minute + utc_dt.second / 60
-  return sunrise_min <= now_min <= sunset_min
+  for day_offset in (-1, 0, 1):
+    d = utc_dt + datetime.timedelta(days=day_offset)
+    sr, ss = _sunrise_sunset_min(lat, lon, d)
+    if sr == 'always':
+      return True
+    if sr is None:
+      continue  # polar night this day
+    sr += day_offset * 1440
+    ss += day_offset * 1440
+    if sr <= now_min <= ss:
+      return True
+  return False
 
 
 def at_cmd(cmd: str) -> str: