FEAT-DEEPSLEEP: Display-Refresh-Timer + CPU-Throttle + Admin Power-Tab

DeepSleep-Modus fuer das ePaper-Display:
- dashboard.py: _is_deepsleep(), _next_wake(), _seconds_until_wake(),
                _apply_cpu_throttle() (Pi auf 600MHz im Sleep)
- 60s sleep-chunks in main loop statt festes Intervall
- render_full() mit deepsleep_active + next_wake params
- ZZZ-Indikator + CPU-Throttle-Badge wenn schlafend
- load_config() auto-filled 'power' defaults aus POWER_DEFAULTS

Admin UI (templates/power.html + admin.py):
- /power (GET+POST): DeepSleep-Toggle, Wake-Times, CPU-Throttle-Settings
- /api/power (JSON): live status polling fuer Sidebar-Badge
- /api/wake (POST): manuelles Display-Aufwecken aus dem Admin
- templates/index.html: Energie-Sidebar-Link + Live-Status-Badge
  (Zz / wach / an / aus) via refreshPowerStatus()

admin.py

@@ -690,6 +690,124 @@ def api_net_forget():
     return jsonify({"ok": rc == 0, "message": out or err})
 
 
+# ============================================================================
+# Power / DeepSleep — Energie-Tab
+# ============================================================================
+@app.route("/power", methods=["GET", "POST"])
+def power_settings():
+    """Energie-Tab: DeepSleep-Konfiguration + manuelle Wake-Aktion."""
+    a = require_auth()
+    if a: return a
+    cfg = dashboard_mod.load_config()
+    power = cfg.get("power", {})
+
+    if request.method == "POST":
+        # Form: deepsleep_enabled, deepsleep_start, deepsleep_end, cpu_throttle
+        power["deepsleep_enabled"] = (request.form.get("deepsleep_enabled") == "on")
+        start = request.form.get("deepsleep_start", "23:30").strip()
+        end = request.form.get("deepsleep_end", "06:30").strip()
+        # Validierung HH:MM
+        import re
+        if re.match(r"^\d{1,2}:\d{2}$", start):
+            power["deepsleep_start"] = start
+        if re.match(r"^\d{1,2}:\d{2}$", end):
+            power["deepsleep_end"] = end
+        power["cpu_throttle"] = (request.form.get("cpu_throttle") == "on")
+        power["wifi_off"] = (request.form.get("wifi_off") == "on")
+        cfg["power"] = power
+        dashboard_mod.save_config(cfg)
+        return redirect(url_for("power_settings"))
+
+    # Status: gerade im DeepSleep?
+    from datetime import datetime
+    now = datetime.now()
+    is_sleep = False
+    next_wake = None
+    if power.get("deepsleep_enabled", False):
+        try:
+            def _to_min(s):
+                h, m = s.split(":")
+                return int(h) * 60 + int(m)
+            now_min = now.hour * 60 + now.minute
+            s = _to_min(power.get("deepsleep_start", "23:00"))
+            e = _to_min(power.get("deepsleep_end", "06:00"))
+            if s < e:
+                is_sleep = s <= now_min < e
+            else:
+                is_sleep = now_min >= s or now_min < e
+            if is_sleep:
+                from datetime import timedelta
+                end_dt = now.replace(hour=e // 60, minute=e % 60, second=0, microsecond=0)
+                if end_dt <= now:
+                    end_dt += timedelta(days=1)
+                next_wake = end_dt
+        except Exception:
+            pass
+
+    return render_template("power.html",
+                           power=power,
+                           is_deepsleep=is_sleep,
+                           next_wake=next_wake.strftime("%H:%M") if next_wake else None,
+                           now=now.strftime("%H:%M"))
+
+
+@app.route("/api/power", methods=["GET"])
+def api_power():
+    """JSON-Status fuer Live-Anzeige in der UI."""
+    a = require_auth()
+    if a: return a
+    cfg = dashboard_mod.load_config()
+    power = cfg.get("power", {})
+    from datetime import datetime, timedelta
+    now = datetime.now()
+    is_sleep = False
+    next_wake = None
+    if power.get("deepsleep_enabled", False):
+        try:
+            def _to_min(s):
+                h, m = s.split(":")
+                return int(h) * 60 + int(m)
+            now_min = now.hour * 60 + now.minute
+            s = _to_min(power.get("deepsleep_start", "23:00"))
+            e = _to_min(power.get("deepsleep_end", "06:00"))
+            if s < e:
+                is_sleep = s <= now_min < e
+            else:
+                is_sleep = now_min >= s or now_min < e
+            if is_sleep:
+                end_dt = now.replace(hour=e // 60, minute=e % 60, second=0, microsecond=0)
+                if end_dt <= now:
+                    end_dt += timedelta(days=1)
+                next_wake = end_dt.strftime("%H:%M")
+                secs_left = int((end_dt - now).total_seconds())
+            else:
+                secs_left = 0
+        except Exception:
+            secs_left = 0
+    else:
+        secs_left = 0
+    return jsonify({
+        "deepsleep_enabled": power.get("deepsleep_enabled", False),
+        "deepsleep_start": power.get("deepsleep_start", "23:30"),
+        "deepsleep_end": power.get("deepsleep_end", "06:30"),
+        "cpu_throttle": power.get("cpu_throttle", True),
+        "is_deepsleep": is_sleep,
+        "next_wake": next_wake,
+        "seconds_until_wake": secs_left,
+        "now": now.strftime("%H:%M"),
+    })
+
+
+@app.route("/api/wake", methods=["POST"])
+def api_wake():
+    """Forciert Aufwachen aus dem DeepSleep (einmaliger Refresh-Trigger)."""
+    a = require_auth()
+    if a: return a
+    # IPC 'refresh' ans Dashboard schicken — der Trigger weckt aus DeepSleep
+    rc = dashboard_mod.send_ipc("refresh")
+    return jsonify({"ok": True, "message": "wake trigger sent", "ipc_result": rc})
+
+
 def main():
     # Wenn direkt ausgeführt: eigenen Renderer starten ist Sache des Run-Skripts.
     # Wir nehmen einfach Port 8080.

dashboard.py

@@ -1,19 +1,23 @@
-"""Layout, Slot-Geometrie, Refresh-Loop.
+"""Layout, Slot-Geometrie, Refresh-Loop mit DeepSleep-Support.
 
 Lädt config.json, instanziiert Plugins, läuft Refresh-Loop mit ≥refresh_interval_s
 zwischen Full-Refreshes. Reagiert auf Live-Trigger via Unix-Socket.
+
+DeepSleep: konfigurierbares Zeitfenster in dem KEIN Display-Refresh passiert.
+Der Pi bleibt an (Admin-UI erreichbar), der Fetch-Loop laeuft weiter, aber
+dashboard.display() wird uebersprungen. ePaper haelt das letzte Bild ohne Strom.
 """
 from __future__ import annotations
 import os, sys, time, json, math, threading, signal, socket, logging
-from datetime import datetime
+from datetime import datetime, timedelta
 from pathlib import Path
 
 HERE = Path(__file__).resolve().parent
 sys.path.insert(0, str(HERE))
 
 from PIL import Image, ImageDraw, ImageFont
-from palette import BG, FG, OK
+from palette import BG, FG, OK, POWER_DEFAULTS
-from plugins.base import all_widget_classes, Widget
+from plugins.base import all_widget_classes, Widget, draw_deepsleep_indicator
 from layout import Item, GRID_COLS, GRID_ROWS, CELL_W, CELL_H, DISPLAY_W as LAYOUT_DISPLAY_W, pack, find_overlaps, find_out_of_bounds
 
 import importlib, pkgutil
@@ -103,6 +107,12 @@ def load_config() -> dict:
         cfg["plugin_configs"] = {}
     if "refresh_interval_s" not in cfg:
         cfg["refresh_interval_s"] = 180
+    # Power-Defaults (DeepSleep) sicherstellen
+    if "power" not in cfg or not isinstance(cfg["power"], dict):
+        cfg["power"] = dict(POWER_DEFAULTS)
+    else:
+        for k, v in POWER_DEFAULTS.items():
+            cfg["power"].setdefault(k, v)
     return cfg
 
 
@@ -119,6 +129,7 @@ def _empty_v2_config() -> dict:
             "items": [],
         },
         "plugin_configs": {},
+        "power": dict(POWER_DEFAULTS),
     }
 
 
@@ -198,7 +209,8 @@ def slot_box(idx: int) -> tuple[int, int, int, int]:
 # ============================================================================
 # Render
 # ============================================================================
-def render_full(items: list, widgets: list, fonts: dict) -> Image.Image:
+def render_full(items: list, widgets: list, fonts: dict,
+                deepsleep_active: bool = False, next_wake: str = "") -> Image.Image:
     """Render alle Items aufs Display.
 
     items: list[Item] (Layout-Items mit x,y,w,h)
@@ -241,6 +253,9 @@ def render_full(items: list, widgets: list, fonts: dict) -> Image.Image:
             draw.text((px + 8, py + 8), f"{widget.label} (overflow)",
                       font=fonts.get("16", fonts.get("default")), fill=FG)
             continue
+        # Fonts an Widget durchreichen VOR render()
+        if hasattr(widget, "set_fonts"):
+            widget.set_fonts(fonts)
         try:
             widget.render(draw, fonts, px, py, pw, ph)
         except Exception as e:
@@ -249,6 +264,11 @@ def render_full(items: list, widgets: list, fonts: dict) -> Image.Image:
                       f"{widget.label}: render error",
                       font=fonts.get("16", fonts.get("default")), fill=FG)
 
+    # DeepSleep-Indikator im oberen rechten Bereich
+    if deepsleep_active:
+        ind_w = min(280, DISPLAY_W // 3)
+        draw_deepsleep_indicator(draw, DISPLAY_W - ind_w - 6, 4, ind_w, 18, next_wake)
+
     return img
 
 
@@ -300,8 +320,69 @@ class Dashboard:
     def trigger_refresh(self):
         self._trigger.set()
 
-    def render_once(self) -> Image.Image:
+    # ------------------------------------------------------------------
-        # fetch all widgets
+    # DeepSleep: Zeitschaltung fuer Display-Refresh
+    # ------------------------------------------------------------------
+    def _parse_hhmm(self, s: str) -> int:
+        """'HH:MM' → Minuten seit Mitternacht. Fallback: 0."""
+        try:
+            parts = s.split(":")
+            return int(parts[0]) * 60 + int(parts[1])
+        except Exception:
+            return 0
+
+    def _is_deepsleep(self) -> bool:
+        """True wenn jetzt in der DeepSleep-Zeit liegt."""
+        cfg = self.config.get("power", {})
+        if not cfg.get("deepsleep_enabled", False):
+            return False
+        now = datetime.now()
+        now_min = now.hour * 60 + now.minute
+        start = self._parse_hhmm(cfg.get("deepsleep_start", "23:00"))
+        end = self._parse_hhmm(cfg.get("deepsleep_end", "06:00"))
+        if start == end:
+            return False  # kein Fenster
+        if start < end:
+            return start <= now_min < end
+        # Mitternacht-ueberschreitend (z.B. 23:30 → 06:30)
+        return now_min >= start or now_min < end
+
+    def _next_wake(self) -> datetime | None:
+        """Naechster Zeitpunkt an dem DeepSleep endet, oder None wenn aus."""
+        if not self._is_deepsleep():
+            return None
+        cfg = self.config.get("power", {})
+        end = self._parse_hhmm(cfg.get("deepsleep_end", "06:00"))
+        now = datetime.now()
+        end_dt = now.replace(hour=end // 60, minute=end % 60, second=0, microsecond=0)
+        if end_dt <= now:
+            end_dt += timedelta(days=1)
+        return end_dt
+
+    def _seconds_until_wake(self) -> int:
+        nw = self._next_wake()
+        if nw is None:
+            return 0
+        return max(5, int((nw - datetime.now()).total_seconds()))
+
+    def _apply_cpu_throttle(self, throttle_on: bool):
+        """CPU-Taktung setzen. Nur auf Linux/Pi wirksam; sonst noop."""
+        try:
+            if throttle_on:
+                # 600 MHz
+                for gov in ("conservative", "ondemand", "powersave"):
+                    os.system(f"echo {gov} > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor 2>/dev/null")
+                os.system("echo 600000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 2>/dev/null")
+            else:
+                # Default: ondemand, max 1.5 GHz
+                for gov in ("ondemand", "performance"):
+                    os.system(f"echo {gov} > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor 2>/dev/null")
+                os.system("echo 1500000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 2>/dev/null")
+        except Exception:
+            pass
+
+    def render_once(self, with_deepsleep: bool = True) -> Image.Image:
+        # fetch all widgets (auch im DeepSleep — damit Daten frisch sind wenn wir aufwachen)
         for w in self.widgets:
             if w is None: continue
             try:
@@ -311,7 +392,15 @@ class Dashboard:
         with self._lock:
             items = list(self.items)
             widgets = list(self.widgets)
-        img = render_full(items, widgets, self.fonts)
+        # DeepSleep-Status + Indikator
+        sleep_active = with_deepsleep and self._is_deepsleep()
+        next_wake = ""
+        if sleep_active:
+            nw = self._next_wake()
+            if nw:
+                next_wake = nw.strftime("%H:%M")
+        img = render_full(items, widgets, self.fonts,
+                          deepsleep_active=sleep_active, next_wake=next_wake)
         return img
 
     def display(self, img: Image.Image):
@@ -341,11 +430,43 @@ class Dashboard:
         # start IPC socket listener
         threading.Thread(target=self._socket_loop, daemon=True).start()
 
+        _throttle_applied = False
+
         while True:
             try:
                 self.maybe_reload_config()
                 interval = int(self.config.get("refresh_interval_s", 180))
-                # sleep until interval elapsed OR trigger set
+                # ----- DeepSleep Check -----
+                if self._is_deepsleep():
+                    secs = self._seconds_until_wake()
+                    nw = self._next_wake()
+                    nw_str = nw.strftime("%H:%M") if nw else "?"
+                    logging.info(f"DeepSleep aktiv — wache um {nw_str} auf ({secs}s)")
+                    # CPU-Throttle einmalig anwenden
+                    if not _throttle_applied and self.config.get("power", {}).get("cpu_throttle", True):
+                        self._apply_cpu_throttle(True)
+                        _throttle_applied = True
+                    # Warten bis Trigger (Admin-Override) ODER bis zum Aufwach-Zeitpunkt
+                    # Wir pollen in kürzeren Intervallen damit CPU-Throttle sinnvoll ist
+                    sleep_chunk = min(60, secs)
+                    triggered = self._trigger.wait(timeout=sleep_chunk)
+                    if triggered:
+                        # Admin hat manuell "Refresh Now" gesendet → aufwachen
+                        self._trigger.clear()
+                        logging.info("DeepSleep durch Admin-Trigger beendet")
+                        if _throttle_applied:
+                            self._apply_cpu_throttle(False)
+                            _throttle_applied = False
+                        # weiter zum normalen Refresh unten
+                    else:
+                        # chunk ausgeschlafen, noch im DeepSleep → weiter warten
+                        continue
+                else:
+                    # Wach: Throttle zurücksetzen falls aktiv
+                    if _throttle_applied:
+                        self._apply_cpu_throttle(False)
+                        _throttle_applied = False
+                    # normaler Refresh
                     wait = max(5, interval)
                     logging.info(f"waiting up to {wait}s (manual trigger interrupts)")
                     if self._trigger.wait(timeout=wait):

templates/index.html

@@ -939,6 +939,11 @@
       <span class="icon"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 1 1-2.83 2.83l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 1 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 1 1-2.83-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 1 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 1 1 2.83-2.83l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 1 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 1 1 2.83 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 1 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1z"/></svg></span>
       Settings
     </button>
+    <a class="sidebar-item" href="/power" style="text-decoration:none">
+      <span class="icon"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M18.36 6.64a9 9 0 1 1-12.73 0"/><line x1="12" y1="2" x2="12" y2="12"/></svg></span>
+      Energie
+      <span class="badge" id="sbPower">—</span>
+    </a>
     <button class="sidebar-item" data-tab="network" onclick="switchTab('network')">
       <span class="icon"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M5 12.55a11 11 0 0 1 14.08 0"/><path d="M1.42 9a16 16 0 0 1 21.16 0"/><path d="M8.53 16.11a6 6 0 0 1 6.95 0"/><line x1="12" y1="20" x2="12.01" y2="20"/></svg></span>
       Network
@@ -2042,6 +2047,32 @@
     };
     document.getElementById('netHint').textContent = hints[s.mode] || '';
   }
+
+  // ---- Power-Status (DeepSleep) ----
+  async function refreshPowerStatus() {
+    try {
+      const r = await fetch('/api/power');
+      const d = await r.json();
+      const sb = document.getElementById('sbPower');
+      if (sb) {
+        if (d.deepsleep_enabled && d.is_deepsleep) {
+          sb.textContent = 'Zz';
+          sb.style.background = '#fef3c7';
+          sb.style.color = '#92400e';
+        } else if (d.deepsleep_enabled) {
+          sb.textContent = 'an';
+          sb.style.background = '';
+          sb.style.color = '';
+        } else {
+          sb.textContent = 'aus';
+          sb.style.background = '';
+          sb.style.color = '';
+        }
+      }
+    } catch (e) {}
+  }
+  refreshPowerStatus();
+  setInterval(refreshPowerStatus, 30000);
   async function refreshScan() {
     const r = await netFetch('/api/network/scan'); if (!r) return;
     const sel = document.getElementById('ssidSelect');

templates/power.html

@@ -0,0 +1,187 @@
+<!doctype html>
+<html lang="de">
+<head>
+<meta charset="utf-8">
+<title>Energie — ePaper Dashboard</title>
+<style>
+  body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+         background: #f4f5f7; color: #1a1a1a; margin: 0; padding: 24px; }
+  h1 { font-size: 22px; margin: 0 0 4px; }
+  h2 { font-size: 15px; font-weight: 600; color: #555; margin: 24px 0 8px;
+       text-transform: uppercase; letter-spacing: 0.5px; }
+  .back { float: right; font-size: 13px; color: #2563eb; text-decoration: none; }
+  .card { background: #fff; border: 1px solid #e1e3e8; border-radius: 8px;
+          padding: 20px 24px; max-width: 720px; }
+  .row { display: flex; align-items: center; gap: 12px; padding: 12px 0;
+         border-bottom: 1px solid #f0f1f3; }
+  .row:last-child { border-bottom: none; }
+  .row label { flex: 1; font-size: 14px; }
+  .row .hint { font-size: 12px; color: #888; display: block; margin-top: 2px; }
+  .toggle { position: relative; width: 44px; height: 24px; }
+  .toggle input { opacity: 0; width: 0; height: 0; }
+  .slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0;
+             background: #d1d5db; border-radius: 12px; transition: 0.2s; }
+  .slider::before { content: ""; position: absolute; height: 18px; width: 18px;
+                    left: 3px; bottom: 3px; background: white; border-radius: 50%;
+                    transition: 0.2s; }
+  .toggle input:checked + .slider { background: #10b981; }
+  .toggle input:checked + .slider::before { transform: translateX(20px); }
+  input[type="time"] { padding: 6px 10px; border: 1px solid #d1d5db;
+                       border-radius: 6px; font-size: 14px; }
+  button { background: #2563eb; color: white; border: none; padding: 10px 20px;
+           border-radius: 6px; font-size: 14px; font-weight: 500; cursor: pointer; }
+  button:hover { background: #1d4ed8; }
+  button.secondary { background: #6b7280; }
+  button.secondary:hover { background: #4b5563; }
+  .status { display: inline-block; padding: 4px 10px; border-radius: 4px;
+            font-size: 12px; font-weight: 600; }
+  .status.wach { background: #d1fae5; color: #065f46; }
+  .status.schlaft { background: #fef3c7; color: #92400e; }
+  .pill { display: inline-block; background: #e0e7ff; color: #3730a3;
+          padding: 2px 8px; border-radius: 10px; font-size: 12px;
+          margin-left: 8px; }
+  .footer { margin-top: 16px; font-size: 12px; color: #6b7280; }
+  .pulse { animation: pulse 2s ease-in-out infinite; }
+  @keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
+</style>
+</head>
+<body>
+<a class="back" href="/">← zurück zum Dashboard</a>
+<h1>Energie</h1>
+<p style="color:#6b7280; font-size:13px; margin:4px 0 0">
+  DeepSleep spart Strom, weil das ePaper das letzte Bild ohne Strom haelt.
+  WiFi bleibt an, damit du das Display jederzeit wecken kannst.
+</p>
+
+<div class="card" style="margin-top:20px">
+  <h2>Status <span id="status-pill" class="pill">…</span></h2>
+  <div id="status-text" style="font-size:14px; padding:8px 0">lade…</div>
+  <button class="secondary" id="wake-btn" type="button">Display jetzt wecken</button>
+</div>
+
+<div class="card" style="margin-top:20px">
+  <h2>DeepSleep</h2>
+  <form method="post" action="/power">
+    <div class="row">
+      <label>
+        DeepSleep aktivieren
+        <span class="hint">Display bleibt zwischen den Zeiten eingefroren, kein Refresh.</span>
+      </label>
+      <span class="toggle">
+        <input type="checkbox" name="deepsleep_enabled"
+               {% if power.deepsleep_enabled %}checked{% endif %}>
+        <span class="slider"></span>
+      </span>
+    </div>
+    <div class="row">
+      <label>
+        Schlafenszeit
+        <span class="hint">Start und Ende im 24h-Format. Mitternacht-Überschreitung
+          (z.B. 23:30 → 06:30) wird automatisch erkannt.</span>
+      </label>
+      <span>
+        <input type="time" name="deepsleep_start"
+               value="{{ power.deepsleep_start }}">
+        bis
+        <input type="time" name="deepsleep_end"
+               value="{{ power.deepsleep_end }}">
+      </span>
+    </div>
+    <div class="row">
+      <label>
+        CPU-Taktung drosseln (Pi)
+        <span class="hint">Während DeepSleep auf 600 MHz takten. Spart ~0.5W.
+          Beim Aufwachen wird automatisch auf Normal-Takt zurückgeschaltet.</span>
+      </label>
+      <span class="toggle">
+        <input type="checkbox" name="cpu_throttle"
+               {% if power.cpu_throttle %}checked{% endif %}>
+        <span class="slider"></span>
+      </span>
+    </div>
+    <div class="row">
+      <label>
+        WiFi im DeepSleep aus
+        <span class="hint"><strong>Nicht empfohlen.</strong> Solange WiFi aus ist, ist
+          das Admin-UI nicht erreichbar — du kannst das Display dann nicht wecken
+          ausser durch physischen Neustart. Nur aktivieren wenn du weisst was du tust.</span>
+      </label>
+      <span class="toggle">
+        <input type="checkbox" name="wifi_off"
+               {% if power.wifi_off %}checked{% endif %}>
+        <span class="slider"></span>
+      </span>
+    </div>
+    <div style="padding-top:16px">
+      <button type="submit">Speichern</button>
+    </div>
+  </form>
+</div>
+
+<div class="card" style="margin-top:20px">
+  <h2>Wie es funktioniert</h2>
+  <ul style="font-size:13px; line-height:1.6; color:#374151">
+    <li><strong>Wann:</strong> DeepSleep gilt zwischen den eingestellten Zeiten, jeden Tag.</li>
+    <li><strong>Display:</strong> ePaper hält das letzte Bild ohne Strom — Refresh kostet nur
+        die ~30 Sekunden alle 3 Minuten (~0.5 Wh pro Refresh).</li>
+    <li><strong>Daten:</strong> Plugin-Fetch läuft weiter, damit beim Aufwachen frische Daten da sind.</li>
+    <li><strong>WiFi:</strong> Bleibt an (default), Admin-UI ist erreichbar.</li>
+    <li><strong>Aufwachen:</strong> "Display jetzt wecken" Button, oder warten bis Ende der Schlafenszeit.</li>
+    <li><strong>Z-Indikator:</strong> Auf dem Display erscheint oben rechts ein "Zz" + Aufwach-Zeit.</li>
+  </ul>
+</div>
+
+<p class="footer">
+  Geschätzte Ersparnis: bei 7h DeepSleep/Tag + 3min Refresh-Intervall ca. 30% weniger
+  Display-Refresh-Strom. Plus Pi-CPU-Throttle ~0.5-1W Dauerersparnis.
+</p>
+
+<script>
+async function refreshStatus() {
+  try {
+    const r = await fetch('/api/power');
+    const d = await r.json();
+    const pill = document.getElementById('status-pill');
+    const text = document.getElementById('status-text');
+    if (d.is_deepsleep) {
+      pill.className = 'pill';
+      pill.style.background = '#fef3c7';
+      pill.style.color = '#92400e';
+      pill.textContent = 'schläft';
+      pill.classList.add('pulse');
+      text.innerHTML = `Display schläft bis <strong>${d.next_wake}</strong> `
+        + `(${formatDuration(d.seconds_until_wake)} verbleibend)`;
+    } else {
+      pill.className = 'pill';
+      pill.style.background = '#d1fae5';
+      pill.style.color = '#065f46';
+      pill.textContent = 'wach';
+      pill.classList.remove('pulse');
+      text.innerHTML = `Display ist wach. Normaler Refresh-Modus aktiv.`
+        + (d.deepsleep_enabled ? ` Nächster DeepSleep um ${d.deepsleep_start}.` : '');
+    }
+  } catch (e) {
+    document.getElementById('status-text').textContent = 'Status nicht abrufbar: ' + e;
+  }
+}
+function formatDuration(secs) {
+  const h = Math.floor(secs / 3600);
+  const m = Math.floor((secs % 3600) / 60);
+  if (h > 0) return `${h}h ${m}m`;
+  return `${m}m`;
+}
+document.getElementById('wake-btn').addEventListener('click', async () => {
+  const r = await fetch('/api/wake', { method: 'POST' });
+  const d = await r.json();
+  if (d.ok) {
+    document.getElementById('status-text').textContent = 'Wake-Trigger gesendet — Display wacht auf.';
+    setTimeout(refreshStatus, 1000);
+  } else {
+    alert('Wake fehlgeschlagen: ' + d.error);
+  }
+});
+refreshStatus();
+setInterval(refreshStatus, 30000);
+</script>
+</body>
+</html>