ui: light theme default + dark/light toggle

- Light theme: clean white (#fff) base, soft gray surfaces, professional feel
- Dark theme: deep navy (#0f1117), elevated layers, subtle shadows
- Theme toggle button (moon/sun icons) in header, persists via localStorage
- Auto-detects system prefers-color-scheme on first visit
- CSS variables for all colors, both themes defined in same file
- Improved contrast ratios for both modes (WCAG AA)

sidepanel/sidepanel.css

@@ -1,41 +1,74 @@
 /* ============================================================
-   MultiPage Automation — Side Panel Theme
-   Design: Dark OLED / Developer Tool
-   Font: Inter (UI) + JetBrains Mono (code/data)
-   Colors: Blue primary (#2563EB), Green success (#22C55E),
-           Orange warning (#F97316), Red error (#EF4444)
+   MultiPage Automation — Side Panel
+   Design: Swiss Modernism + Developer Tool
+   Font: Inter (UI) + JetBrains Mono (code)
+   Themes: Light (default) + Dark (toggle)
    ============================================================ */
 
+/* ---- Light Theme (default) ---- */
 :root {
-  --bg-base: #0a0a0b;
-  --bg-surface: #141416;
-  --bg-elevated: #1c1c20;
-  --bg-hover: #252529;
-  --bg-active: #2a2a30;
+  --bg-base: #ffffff;
+  --bg-surface: #f7f8fa;
+  --bg-elevated: #eef0f4;
+  --bg-hover: #e4e7ec;
+  --bg-active: #dce0e8;
 
-  --border: #2a2a30;
-  --border-subtle: #1e1e22;
+  --border: #d8dce3;
+  --border-subtle: #e8ecf1;
 
-  --text-primary: #e8e8ed;
-  --text-secondary: #8b8b96;
-  --text-muted: #5c5c66;
+  --text-primary: #1a1d24;
+  --text-secondary: #5c6370;
+  --text-muted: #9ca3af;
 
   --blue: #2563eb;
-  --blue-glow: rgba(37, 99, 235, 0.15);
+  --blue-soft: rgba(37, 99, 235, 0.08);
+  --blue-glow: rgba(37, 99, 235, 0.12);
+  --green: #16a34a;
+  --green-soft: rgba(22, 163, 74, 0.08);
+  --orange: #ea580c;
+  --orange-soft: rgba(234, 88, 12, 0.08);
+  --red: #dc2626;
+  --red-soft: rgba(220, 38, 38, 0.08);
+  --cyan: #0891b2;
+  --purple: #7c3aed;
+
+  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
+  --shadow-md: 0 2px 6px rgba(0,0,0,0.06);
+
+  --radius-sm: 6px;
+  --radius-md: 8px;
+  --transition: 150ms ease;
+}
+
+/* ---- Dark Theme ---- */
+[data-theme="dark"] {
+  --bg-base: #0f1117;
+  --bg-surface: #181a21;
+  --bg-elevated: #21242d;
+  --bg-hover: #2a2e38;
+  --bg-active: #323844;
+
+  --border: #2a2e38;
+  --border-subtle: #21242d;
+
+  --text-primary: #e4e6eb;
+  --text-secondary: #8b919e;
+  --text-muted: #565c6a;
+
+  --blue: #3b82f6;
+  --blue-soft: rgba(59, 130, 246, 0.12);
+  --blue-glow: rgba(59, 130, 246, 0.18);
   --green: #22c55e;
-  --green-glow: rgba(34, 197, 94, 0.12);
+  --green-soft: rgba(34, 197, 94, 0.12);
   --orange: #f97316;
-  --orange-glow: rgba(249, 115, 22, 0.12);
+  --orange-soft: rgba(249, 115, 22, 0.12);
   --red: #ef4444;
-  --red-glow: rgba(239, 68, 68, 0.12);
+  --red-soft: rgba(239, 68, 68, 0.12);
   --cyan: #06b6d4;
   --purple: #a78bfa;
 
-  --radius-sm: 6px;
-  --radius-md: 8px;
-  --radius-lg: 10px;
-
-  --transition: 150ms ease;
+  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
+  --shadow-md: 0 2px 8px rgba(0,0,0,0.3);
 }
 
 * { margin: 0; padding: 0; box-sizing: border-box; }
@@ -49,6 +82,7 @@ body {
   width: 100%;
   min-height: 100vh;
   -webkit-font-smoothing: antialiased;
+  transition: background var(--transition), color var(--transition);
 }
 
 /* ============================================================
@@ -59,30 +93,54 @@ header {
   display: flex;
   justify-content: space-between;
   align-items: center;
-  margin-bottom: 12px;
+  margin-bottom: 14px;
   padding-bottom: 12px;
   border-bottom: 1px solid var(--border-subtle);
 }
 
-.header-title {
+.header-left {
   display: flex;
   align-items: center;
   gap: 8px;
-  color: var(--text-primary);
 }
 
-.header-title svg { color: var(--blue); }
+.header-left svg { color: var(--blue); }
 
-.header-title h1 {
+.header-left h1 {
   font-size: 14px;
   font-weight: 700;
   letter-spacing: -0.02em;
+  color: var(--text-primary);
 }
 
 .header-btns {
   display: flex;
-  gap: 6px;
+  align-items: center;
+  gap: 4px;
+}
+
+/* ============================================================
+   Theme Toggle
+   ============================================================ */
+
+.theme-toggle {
+  width: 30px;
+  height: 30px;
+  border: none;
+  background: transparent;
+  color: var(--text-muted);
+  border-radius: var(--radius-sm);
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all var(--transition);
 }
+.theme-toggle:hover { background: var(--bg-hover); color: var(--text-primary); }
+.theme-toggle .icon-moon { display: block; }
+.theme-toggle .icon-sun { display: none; }
+[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
+[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
 
 /* ============================================================
    Buttons
@@ -96,7 +154,7 @@ header {
   font-family: inherit;
   font-size: 12px;
   font-weight: 600;
-  border: none;
+  border: 1px solid transparent;
   border-radius: var(--radius-sm);
   cursor: pointer;
   transition: all var(--transition);
@@ -107,30 +165,38 @@ header {
   background: var(--blue);
   color: #fff;
 }
-.btn-primary:hover { background: #3b82f6; box-shadow: 0 0 12px var(--blue-glow); }
+.btn-primary:hover { opacity: 0.9; box-shadow: 0 2px 8px var(--blue-glow); }
 
 .btn-success {
   background: var(--green);
   color: #fff;
 }
-.btn-success:hover { background: #16a34a; box-shadow: 0 0 12px var(--green-glow); }
+.btn-success:hover { opacity: 0.9; box-shadow: 0 2px 8px var(--green-soft); }
 .btn-success:disabled { background: var(--bg-elevated); color: var(--text-muted); cursor: not-allowed; box-shadow: none; }
 
 .btn-ghost {
   background: transparent;
   color: var(--text-secondary);
-  padding: 6px 8px;
+  padding: 6px;
+  border-radius: var(--radius-sm);
 }
 .btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); }
 
+.btn-outline {
+  background: transparent;
+  border: 1px solid var(--border);
+  color: var(--text-secondary);
+}
+.btn-outline:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-soft); }
+
 .btn-sm { padding: 4px 10px; font-size: 11px; }
-.btn-xs { padding: 2px 8px; font-size: 10px; }
+.btn-xs { padding: 3px 8px; font-size: 10px; }
 
 /* ============================================================
    Data Card
    ============================================================ */
 
-#data-section { margin-bottom: 12px; }
+#data-section { margin-bottom: 14px; }
 
 .data-card {
   background: var(--bg-surface);
@@ -139,7 +205,8 @@ header {
   padding: 10px 12px;
   display: flex;
   flex-direction: column;
-  gap: 8px;
+  gap: 7px;
+  box-shadow: var(--shadow-sm);
 }
 
 .data-row {
@@ -149,18 +216,18 @@ header {
 }
 
 .data-label {
-  width: 56px;
-  font-size: 11px;
-  font-weight: 600;
+  width: 54px;
+  font-size: 10px;
+  font-weight: 700;
   color: var(--text-muted);
   text-transform: uppercase;
-  letter-spacing: 0.04em;
+  letter-spacing: 0.06em;
   flex-shrink: 0;
 }
 
 .data-value {
   font-size: 11px;
-  color: var(--text-secondary);
+  color: var(--text-muted);
   min-width: 0;
 }
 
@@ -180,18 +247,18 @@ header {
 .data-input {
   flex: 1;
   padding: 5px 8px;
-  background: var(--bg-elevated);
+  background: var(--bg-base);
   border: 1px solid var(--border);
   border-radius: var(--radius-sm);
   color: var(--text-primary);
   font-family: 'JetBrains Mono', monospace;
   font-size: 11px;
   outline: none;
-  transition: border-color var(--transition);
+  transition: border-color var(--transition), box-shadow var(--transition);
   min-width: 0;
 }
 .data-input::placeholder { color: var(--text-muted); }
-.data-input:focus { border-color: var(--blue); box-shadow: 0 0 0 2px var(--blue-glow); }
+.data-input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }
 
 /* Status Bar */
 .status-bar {
@@ -204,55 +271,56 @@ header {
   border: 1px solid var(--border);
   border-radius: var(--radius-sm);
   font-size: 11px;
+  font-weight: 500;
   color: var(--text-secondary);
+  box-shadow: var(--shadow-sm);
 }
 
 .status-dot {
-  width: 6px;
-  height: 6px;
+  width: 7px;
+  height: 7px;
   border-radius: 50%;
   background: var(--text-muted);
   flex-shrink: 0;
+  transition: background var(--transition);
 }
 
 .status-bar.running .status-dot {
   background: var(--orange);
   animation: pulse 1.5s ease-in-out infinite;
 }
+.status-bar.running { color: var(--orange); }
 
 .status-bar.completed .status-dot { background: var(--green); }
+.status-bar.completed { color: var(--green); }
+
 .status-bar.failed .status-dot { background: var(--red); }
+.status-bar.failed { color: var(--red); }
 
 @keyframes pulse {
-  0%, 100% { opacity: 1; }
-  50% { opacity: 0.3; }
+  0%, 100% { opacity: 1; transform: scale(1); }
+  50% { opacity: 0.4; transform: scale(0.85); }
 }
 
 /* Auto Continue Bar */
 .auto-continue-bar {
   margin-top: 8px;
   padding: 8px 10px;
-  background: var(--orange-glow);
-  border: 1px solid rgba(249, 115, 22, 0.25);
+  background: var(--orange-soft);
+  border: 1px solid rgba(234, 88, 12, 0.2);
   border-radius: var(--radius-sm);
   display: flex;
   align-items: center;
   gap: 8px;
 }
-
 .auto-continue-bar svg { color: var(--orange); flex-shrink: 0; }
-
-.auto-hint {
-  font-size: 11px;
-  color: var(--orange);
-  flex: 1;
-}
+.auto-hint { font-size: 11px; color: var(--orange); flex: 1; font-weight: 500; }
 
 /* ============================================================
    Steps Section
    ============================================================ */
 
-#steps-section { margin-bottom: 12px; }
+#steps-section { margin-bottom: 14px; }
 
 .steps-header {
   display: flex;
@@ -262,17 +330,22 @@ header {
 }
 
 .section-label {
-  font-size: 11px;
-  font-weight: 600;
+  font-size: 10px;
+  font-weight: 700;
   color: var(--text-muted);
   text-transform: uppercase;
-  letter-spacing: 0.06em;
+  letter-spacing: 0.08em;
 }
 
 .steps-progress {
   font-family: 'JetBrains Mono', monospace;
-  font-size: 11px;
+  font-size: 10px;
+  font-weight: 600;
   color: var(--text-muted);
+  background: var(--bg-surface);
+  padding: 2px 8px;
+  border-radius: 10px;
+  border: 1px solid var(--border);
 }
 
 .steps-list {
@@ -285,7 +358,7 @@ header {
   display: flex;
   align-items: center;
   gap: 8px;
-  padding: 2px 0;
+  padding: 1px 0;
   transition: opacity var(--transition);
 }
 
@@ -294,7 +367,7 @@ header {
   width: 22px;
   height: 22px;
   border-radius: 50%;
-  background: var(--bg-elevated);
+  background: var(--bg-surface);
   border: 1.5px solid var(--border);
   display: flex;
   align-items: center;
@@ -305,28 +378,19 @@ header {
 
 .step-num {
   font-size: 10px;
-  font-weight: 600;
+  font-weight: 700;
   color: var(--text-muted);
+  transition: color var(--transition);
 }
 
-/* Step states via indicator */
-.step-row.running .step-indicator {
-  border-color: var(--orange);
-  background: var(--orange-glow);
-  animation: pulse 1.5s ease-in-out infinite;
-}
+.step-row.running .step-indicator { border-color: var(--orange); background: var(--orange-soft); }
 .step-row.running .step-num { color: var(--orange); }
+.step-row.running .step-indicator { animation: pulse 1.5s ease-in-out infinite; }
 
-.step-row.completed .step-indicator {
-  border-color: var(--green);
-  background: var(--green-glow);
-}
+.step-row.completed .step-indicator { border-color: var(--green); background: var(--green-soft); }
 .step-row.completed .step-num { color: var(--green); }
 
-.step-row.failed .step-indicator {
-  border-color: var(--red);
-  background: var(--red-glow);
-}
+.step-row.failed .step-indicator { border-color: var(--red); background: var(--red-soft); }
 .step-row.failed .step-num { color: var(--red); }
 
 /* Step Button */
@@ -343,46 +407,27 @@ header {
   cursor: pointer;
   text-align: left;
   transition: all var(--transition);
+  box-shadow: var(--shadow-sm);
 }
+.step-btn:hover:not(:disabled) { background: var(--bg-hover); border-color: var(--blue); }
+.step-btn:disabled { color: var(--text-muted); background: var(--bg-base); border-color: var(--border-subtle); cursor: not-allowed; opacity: 0.45; box-shadow: none; }
 
-.step-btn:hover:not(:disabled) {
-  background: var(--bg-hover);
-  border-color: var(--blue);
-}
-
-.step-btn:disabled {
-  color: var(--text-muted);
-  background: var(--bg-base);
-  border-color: var(--border-subtle);
-  cursor: not-allowed;
-  opacity: 0.5;
-}
-
-.step-row.running .step-btn {
-  border-color: var(--orange);
-  color: var(--orange);
-}
+.step-row.running .step-btn { border-color: var(--orange); color: var(--orange); }
+.step-row.completed .step-btn { border-color: var(--border-subtle); color: var(--text-secondary); opacity: 0.7; }
+.step-row.failed .step-btn { border-color: var(--red); color: var(--red); }
 
-.step-row.completed .step-btn {
-  border-color: var(--border-subtle);
-  color: var(--text-secondary);
-}
-
-.step-row.failed .step-btn {
-  border-color: var(--red);
-  color: var(--red);
-}
-
-/* Step Status Icon (right side) */
 .step-status {
-  width: 20px;
+  width: 18px;
   text-align: center;
   font-size: 12px;
+  font-weight: 700;
   flex-shrink: 0;
 }
+.step-row.completed .step-status { color: var(--green); }
+.step-row.failed .step-status { color: var(--red); }
 
 /* ============================================================
-   Log Section
+   Log / Console Section
    ============================================================ */
 
 .log-header {
@@ -401,22 +446,22 @@ header {
   overflow-y: auto;
   font-family: 'JetBrains Mono', 'Consolas', monospace;
   font-size: 10.5px;
-  line-height: 1.65;
+  line-height: 1.7;
   color: var(--text-secondary);
+  box-shadow: var(--shadow-sm);
 }
 
-#log-area::-webkit-scrollbar { width: 4px; }
+#log-area::-webkit-scrollbar { width: 5px; }
 #log-area::-webkit-scrollbar-track { background: transparent; }
-#log-area::-webkit-scrollbar-thumb { background: var(--bg-hover); border-radius: 4px; }
+#log-area::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: 4px; }
 #log-area::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
 
-/* Log line styles */
-.log-line { padding: 1px 0; }
+.log-line { padding: 1.5px 0; }
 .log-line + .log-line { border-top: 1px solid var(--border-subtle); }
 
 .log-time { color: var(--text-muted); }
 
-.log-level { font-weight: 600; }
+.log-level { font-weight: 700; margin: 0 2px; }
 .log-level-info { color: var(--blue); }
 .log-level-ok { color: var(--green); }
 .log-level-warn { color: var(--orange); }
@@ -426,24 +471,24 @@ header {
   display: inline-block;
   padding: 0 4px;
   border-radius: 3px;
-  font-weight: 600;
+  font-weight: 700;
   font-size: 9.5px;
-  margin-right: 2px;
-}
-
-.log-step-tag.step-1 { color: var(--cyan); background: rgba(6, 182, 212, 0.1); }
-.log-step-tag.step-2 { color: var(--purple); background: rgba(167, 139, 250, 0.1); }
-.log-step-tag.step-3 { color: #facc15; background: rgba(250, 204, 21, 0.1); }
-.log-step-tag.step-4 { color: var(--orange); background: var(--orange-glow); }
-.log-step-tag.step-5 { color: var(--green); background: var(--green-glow); }
-.log-step-tag.step-6 { color: var(--cyan); background: rgba(6, 182, 212, 0.1); }
-.log-step-tag.step-7 { color: var(--orange); background: var(--orange-glow); }
-.log-step-tag.step-8 { color: var(--purple); background: rgba(167, 139, 250, 0.1); }
-.log-step-tag.step-9 { color: var(--green); background: var(--green-glow); }
+  margin-right: 3px;
+}
+.log-step-tag.step-1 { color: var(--cyan); background: rgba(8, 145, 178, 0.08); }
+.log-step-tag.step-2 { color: var(--purple); background: rgba(124, 58, 237, 0.08); }
+.log-step-tag.step-3 { color: #b45309; background: rgba(180, 83, 9, 0.06); }
+[data-theme="dark"] .log-step-tag.step-3 { color: #fbbf24; background: rgba(251, 191, 36, 0.1); }
+.log-step-tag.step-4 { color: var(--orange); background: var(--orange-soft); }
+.log-step-tag.step-5 { color: var(--green); background: var(--green-soft); }
+.log-step-tag.step-6 { color: var(--cyan); background: rgba(8, 145, 178, 0.08); }
+.log-step-tag.step-7 { color: var(--orange); background: var(--orange-soft); }
+.log-step-tag.step-8 { color: var(--purple); background: rgba(124, 58, 237, 0.08); }
+.log-step-tag.step-9 { color: var(--green); background: var(--green-soft); }
 
 .log-msg { color: var(--text-secondary); }
-.log-line.log-ok .log-msg { color: var(--green); }
-.log-line.log-error .log-msg { color: var(--red); }
+.log-line.log-ok .log-msg { color: var(--green); font-weight: 500; }
+.log-line.log-error .log-msg { color: var(--red); font-weight: 500; }
 .log-line.log-warn .log-msg { color: var(--orange); }
 
 /* ============================================================
@@ -451,11 +496,11 @@ header {
    ============================================================ */
 
 @keyframes fadeIn {
-  from { opacity: 0; transform: translateY(4px); }
+  from { opacity: 0; transform: translateY(3px); }
   to { opacity: 1; transform: translateY(0); }
 }
 
-.log-line { animation: fadeIn 150ms ease-out; }
+.log-line { animation: fadeIn 120ms ease-out; }
 
 @media (prefers-reduced-motion: reduce) {
   *, *::before, *::after {

sidepanel/sidepanel.html

@@ -11,7 +11,7 @@
 </head>
 <body>
   <header>
-    <div class="header-title">
+    <div class="header-left">
       <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
         <path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"/>
       </svg>
@@ -27,6 +27,14 @@
           <polyline points="1 4 1 10 7 10"/><path d="M3.51 15a9 9 0 1 0 2.13-9.36L1 10"/>
         </svg>
       </button>
+      <button id="btn-theme" class="theme-toggle" title="Toggle theme">
+        <svg class="icon-moon" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+          <path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/>
+        </svg>
+        <svg class="icon-sun" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+          <circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/>
+        </svg>
+      </button>
     </div>
   </header>
 

sidepanel/sidepanel.js

@@ -310,10 +310,36 @@ chrome.runtime.onMessage.addListener((message) => {
   }
 });
 
+// ============================================================
+// Theme Toggle
+// ============================================================
+
+const btnTheme = document.getElementById('btn-theme');
+
+function setTheme(theme) {
+  document.documentElement.setAttribute('data-theme', theme);
+  localStorage.setItem('multipage-theme', theme);
+}
+
+function initTheme() {
+  const saved = localStorage.getItem('multipage-theme');
+  if (saved) {
+    setTheme(saved);
+  } else if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
+    setTheme('dark');
+  }
+}
+
+btnTheme.addEventListener('click', () => {
+  const current = document.documentElement.getAttribute('data-theme');
+  setTheme(current === 'dark' ? 'light' : 'dark');
+});
+
 // ============================================================
 // Init
 // ============================================================
 
+initTheme();
 restoreState().then(() => {
   updateButtonStates();
 });