/* ==========================================================================
   DWNY Windows 11 Fluent Settings Theme
   Authentic Microsoft Fluent Design / Windows 11 Settings Interface
   ========================================================================== */

/* ---------- Windows 11 Design System Tokens ---------- */
:root {
  color-scheme: light dark;
  accent-color: var(--win-accent);

  --win-font: 'Segoe UI Variable Text', 'Segoe UI Variable', 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  --win-mono: 'Cascadia Code', 'Consolas', monospace;

  /* Radii */
  --win-r-sm: 4px;
  --win-r: 8px;
  --win-r-lg: 12px;
  --win-r-pill: 9999px;

  /* Semantics */
  --win-success: #107c41;
  --win-warn: #b45309;
  --win-danger: #c42b1c;

  /* Default Light Theme Surfaces & Palette */
  --win-bg: #f4f6f8;
  --win-mica-bg: radial-gradient(1200px 600px at 50% -120px, var(--win-accent-bg), transparent 65%), #f4f6f8;
  --win-titlebar: #f8fafc;
  --win-sidebar: #f8fafc;
  --win-surface: #ffffff;
  --win-surface-alt: #f1f5f9;
  --win-surface-hover: #e2e8f0;
  --win-surface-active: #cbd5e1;
  --win-border: rgba(15, 23, 42, 0.12);
  --win-border-strong: rgba(15, 23, 42, 0.32);
  --win-border-subtle: rgba(15, 23, 42, 0.06);

  /* Light Typography */
  --win-text: #0f172a;
  --win-text-2: #334155;
  --win-text-3: #64748b;

  /* Scrollbars */
  --win-scroll-thumb: rgba(15, 23, 42, 0.22);
  --win-scroll-thumb-hover: rgba(15, 23, 42, 0.42);
  --win-scroll-track: transparent;

  /* Light Fluent Blue Accent */
  --win-accent: #0284c7;
  --win-accent-hover: #0369a1;
  --win-accent-active: #075985;
  --win-accent-bg: rgba(2, 132, 199, 0.10);
  --win-accent-text: #ffffff;
  --win-pill-active: #0284c7;

  /* Shadows & Elevation */
  --win-shadow-card: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --win-shadow-window: 0 16px 40px rgba(15, 23, 42, 0.10), 0 2px 8px rgba(15, 23, 42, 0.06);
  --win-shadow-flyout: 0 10px 25px rgba(15, 23, 42, 0.15);

  /* Legacy Flavor variables alias mapping */
  --fl-font: var(--win-font);
  --fl-bg: var(--win-bg);
  --fl-surface: var(--win-surface);
  --fl-surface-alt: var(--win-surface-alt);
  --fl-surface-hover: var(--win-surface-hover);
  --fl-border: var(--win-border);
  --fl-text: var(--win-text);
  --fl-text-2: var(--win-text-2);
  --fl-text-3: var(--win-text-3);
  --fl-accent: var(--win-accent);
  --fl-r: var(--win-r);
  --fl-success: var(--win-success);
  --fl-warn: var(--win-warn);
  --fl-danger: var(--win-danger);
}

/* ---------- Windows 11 Dark Theme (High-Contrast & Sleek) ---------- */
[data-theme="dark"],
:root[data-theme="dark"],
body:not([data-theme="light"]) {
  color-scheme: dark;

  --win-bg: #18181b;
  --win-mica-bg: radial-gradient(1200px 600px at 50% -120px, rgba(56, 189, 248, 0.12), transparent 60%), #121215;
  --win-titlebar: #1c1c20;
  --win-sidebar: #18181b;
  --win-surface: #27272a;
  --win-surface-alt: #1e1e24;
  --win-surface-hover: #323238;
  --win-surface-active: #3f3f46;
  --win-border: rgba(255, 255, 255, 0.10);
  --win-border-strong: rgba(255, 255, 255, 0.30);
  --win-border-subtle: rgba(255, 255, 255, 0.05);

  --win-text: #f4f4f5;
  --win-text-2: #cbd5e1;
  --win-text-3: #94a3b8;

  --win-scroll-thumb: rgba(255, 255, 255, 0.25);
  --win-scroll-thumb-hover: rgba(255, 255, 255, 0.45);
  --win-scroll-track: transparent;

  /* Windows 11 Fluent Sky Blue Accent */
  --win-accent: #38bdf8;
  --win-accent-hover: #60cdff;
  --win-accent-active: #90ddff;
  --win-accent-bg: rgba(56, 189, 248, 0.14);
  --win-accent-text: #090d16;
  --win-pill-active: #38bdf8;

  --win-shadow-card: inset 0 1px 0 0 rgba(255, 255, 255, 0.06), 0 2px 6px rgba(0, 0, 0, 0.40);
  --win-shadow-window: 0 24px 60px rgba(0, 0, 0, 0.65), 0 2px 10px rgba(0, 0, 0, 0.40);
  --win-shadow-flyout: 0 12px 28px rgba(0, 0, 0, 0.50);

  --fl-bg: var(--win-bg);
  --fl-surface: var(--win-surface);
  --fl-surface-alt: var(--win-surface-alt);
  --fl-surface-hover: var(--win-surface-hover);
  --fl-border: var(--win-border);
  --fl-text: var(--win-text);
  --fl-text-2: var(--win-text-2);
  --fl-text-3: var(--win-text-3);
  --fl-accent: var(--win-accent);
}

/* ---------- Windows 11 Light Theme Explicit Token Set ---------- */
[data-theme="light"],
:root[data-theme="light"] {
  color-scheme: light;

  --win-bg: #f4f6f8;
  --win-mica-bg: radial-gradient(1200px 600px at 50% -120px, rgba(2, 132, 199, 0.09), transparent 65%), #f4f6f8;
  --win-titlebar: #f8fafc;
  --win-sidebar: #f8fafc;
  --win-surface: #ffffff;
  --win-surface-alt: #f1f5f9;
  --win-surface-hover: #e2e8f0;
  --win-surface-active: #cbd5e1;
  --win-border: rgba(15, 23, 42, 0.12);
  --win-border-strong: rgba(15, 23, 42, 0.32);
  --win-border-subtle: rgba(15, 23, 42, 0.06);

  --win-text: #0f172a;
  --win-text-2: #334155;
  --win-text-3: #64748b;

  --win-scroll-thumb: rgba(15, 23, 42, 0.22);
  --win-scroll-thumb-hover: rgba(15, 23, 42, 0.42);
  --win-scroll-track: transparent;

  --win-accent: #0284c7;
  --win-accent-hover: #0369a1;
  --win-accent-active: #075985;
  --win-accent-bg: rgba(2, 132, 199, 0.10);
  --win-accent-text: #ffffff;
  --win-pill-active: #0284c7;

  --win-shadow-card: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --win-shadow-window: 0 16px 40px rgba(15, 23, 42, 0.10), 0 2px 8px rgba(15, 23, 42, 0.06);
  --win-shadow-flyout: 0 10px 25px rgba(15, 23, 42, 0.15);

  --fl-bg: var(--win-bg);
  --fl-surface: var(--win-surface);
  --fl-surface-alt: var(--win-surface-alt);
  --fl-surface-hover: var(--win-surface-hover);
  --fl-border: var(--win-border);
  --fl-text: var(--win-text);
  --fl-text-2: var(--win-text-2);
  --fl-text-3: var(--win-text-3);
  --fl-accent: var(--win-accent);
}

/* ---------- Global Reset & Custom Scrollbar ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
* {
  scrollbar-width: thin;
  scrollbar-color: var(--win-scroll-thumb) var(--win-scroll-track);
}
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--win-scroll-track);
}
::-webkit-scrollbar-thumb {
  background: var(--win-scroll-thumb);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--win-scroll-thumb-hover);
}

html { font-size: 14px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; }
body {
  font-family: var(--win-font);
  background: var(--win-mica-bg);
  color: var(--win-text);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
}

/* ---------- Windows 11 App Container Window ---------- */
.win-app-window {
  max-width: 1360px;
  margin: 16px auto 32px;
  background: var(--win-bg);
  border: 1px solid var(--win-border);
  border-radius: var(--win-r-lg);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ---------- Windows 11 Title Bar ---------- */
.win-titlebar {
  height: 44px;
  background: var(--win-titlebar);
  border-bottom: 1px solid var(--win-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0 0 16px;
  user-select: none;
}

.win-titlebar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.win-titlebar-icon {
  width: 20px;
  height: 20px;
  color: var(--win-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.win-titlebar-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--win-text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.win-titlebar-tag {
  background: var(--win-accent-bg);
  color: var(--win-accent);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--win-r-pill);
}

.win-titlebar-center {
  flex: 1;
  max-width: 440px;
  margin: 0 20px;
}

.win-search-box {
  position: relative;
  width: 100%;
}
.win-search-input {
  width: 100%;
  height: 30px;
  background: var(--win-surface);
  border: 1px solid var(--win-border);
  border-radius: var(--win-r);
  padding: 0 12px 0 32px;
  color: var(--win-text);
  font-family: inherit;
  font-size: 12px;
  outline: none;
  transition: all 0.15s ease;
}
.win-search-input:focus {
  border-color: var(--win-accent);
  background: var(--win-surface-alt);
}
.win-search-icon {
  position: absolute;
  left: 10px;
  top: 7px;
  color: var(--win-text-3);
  pointer-events: none;
}

.win-titlebar-right {
  display: flex;
  align-items: center;
  height: 100%;
}

/* Windows 11 Theme Toggle Button in Titlebar */
.win-theme-toggle-btn {
  background: var(--win-surface-alt);
  border: 1px solid var(--win-border);
  color: var(--win-text);
  padding: 5px 12px;
  cursor: pointer;
  border-radius: var(--win-r-pill);
  font-size: 12px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-right: 8px;
  box-shadow: var(--win-shadow-card);
  transition: all 0.15s ease;
  user-select: none;
}
.win-theme-toggle-btn:hover {
  background: var(--win-surface-hover);
  border-color: var(--win-border-strong);
  color: var(--win-text);
}
.win-theme-toggle-btn:active {
  background: var(--win-surface-active);
  transform: scale(0.97);
}
#win-theme-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--win-accent);
}
.win-theme-label {
  font-weight: 600;
  font-size: 12px;
}

.win-titlebar-action {
  background: transparent;
  border: 0;
  color: var(--win-text-2);
  padding: 6px 12px;
  cursor: pointer;
  border-radius: var(--win-r-sm);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-right: 8px;
  transition: all 0.15s;
}
.win-titlebar-action:hover {
  background: var(--win-surface-hover);
  color: var(--win-text);
}

/* Windows 11 Window Controls */
.win-controls {
  display: flex;
  height: 100%;
}
.win-btn-control {
  width: 46px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  color: var(--win-text-2);
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s;
}
.win-btn-control:hover {
  background: var(--win-surface-hover);
  color: var(--win-text);
}
.win-btn-control.close:hover {
  background: #e81123 !important;
  color: #ffffff !important;
}

/* ---------- Windows 11 Settings Main Layout ---------- */
.win-settings-shell {
  display: flex;
  min-height: 840px;
}

/* Navigation Rail (Left Sidebar) */
.win-sidebar {
  width: 290px;
  background: var(--win-sidebar);
  border-right: 1px solid var(--win-border-subtle);
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

/* Profile Tile */
.win-profile-tile {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--win-r);
  background: var(--win-surface-alt);
  border: 1px solid var(--win-border);
  margin-bottom: 16px;
}
.win-profile-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--win-r);
  background: linear-gradient(135deg, #0078d4, #8764b8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  flex-shrink: 0;
}
.win-profile-info {
  flex: 1;
  min-width: 0;
}
.win-profile-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--win-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.win-profile-status {
  font-size: 11px;
  color: var(--win-text-3);
  display: flex;
  align-items: center;
  gap: 4px;
}
.win-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: win-pulse 2.5s infinite cubic-bezier(0.4, 0, 0.6, 1);
  display: inline-block;
  flex-shrink: 0;
}
@keyframes win-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  50% { box-shadow: 0 0 0 4px rgba(16, 185, 129, 0); }
}

/* Nav Menu Items */
.win-nav-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.win-nav-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: var(--win-r);
  background: transparent;
  border: 0;
  color: var(--win-text);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all 0.15s ease;
  width: 100%;
}
.win-nav-item:hover {
  background: var(--win-surface-hover);
}
.win-nav-item.active,
.win-nav-item.selected {
  background: var(--win-surface);
  font-weight: 600;
  box-shadow: var(--win-shadow-card);
}
.win-nav-item.active::before,
.win-nav-item.selected::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 18px;
  background: var(--win-pill-active);
  border-radius: 2px;
}
.win-nav-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--win-text-2);
}
.win-nav-item.active .win-nav-icon,
.win-nav-item.selected .win-nav-icon {
  color: var(--win-accent);
}

/* Sidebar Footer / Quick Tools */
.win-sidebar-footer {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--win-border-subtle);
}

/* ---------- Settings Content Canvas (Right Area) ---------- */
.win-content-canvas {
  flex: 1;
  padding: 24px 36px;
  background: var(--win-bg);
  overflow-y: auto;
  max-height: calc(100vh - 100px);
}

/* Page Header */
.win-page-header {
  margin-bottom: 20px;
}
.win-page-title {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--win-text);
  margin-bottom: 4px;
}
.win-page-subtitle {
  font-size: 13px;
  color: var(--win-text-2);
}

/* ---------- Windows 11 Hero Device Card ---------- */
.win-device-card {
  background: var(--win-surface);
  border: 1px solid var(--win-border);
  border-radius: var(--win-r);
  padding: 18px 22px;
  margin-bottom: 24px;
  box-shadow: var(--win-shadow-card);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.win-device-left {
  display: flex;
  align-items: center;
  gap: 16px;
}
.win-device-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--win-r);
  background: var(--win-accent-bg);
  color: var(--win-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
}
.win-device-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--win-text);
}
.win-device-spec {
  font-size: 12px;
  color: var(--win-text-2);
  margin-top: 2px;
}

.win-storage-gauge {
  flex: 1;
  max-width: 320px;
  min-width: 220px;
}
.win-storage-labels {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--win-text-2);
  margin-bottom: 6px;
}
.win-progress-track {
  height: 8px;
  background: var(--win-surface-alt);
  border-radius: var(--win-r-pill);
  overflow: hidden;
  border: 1px solid var(--win-border-subtle);
}
.win-progress-fill {
  height: 100%;
  background: var(--win-accent);
  border-radius: var(--win-r-pill);
  transition: width 0.4s ease;
}

/* ---------- Windows 11 Settings Group & Expander Cards ---------- */
.win-group-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--win-text);
  margin: 24px 0 10px;
}

.win-card {
  background: var(--win-surface);
  border: 1px solid var(--win-border);
  border-radius: var(--win-r);
  box-shadow: var(--win-shadow-card);
  margin-bottom: 12px;
  overflow: hidden;
}

.win-setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--win-border-subtle);
  transition: background 0.15s ease;
}
.win-setting-row:last-child {
  border-bottom: 0;
}
.win-setting-row:hover {
  background: var(--win-surface-hover);
}

.win-setting-main {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 0;
}
.win-setting-icon {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  background: var(--win-surface-alt);
  border: 1px solid var(--win-border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--win-accent);
  flex-shrink: 0;
  font-size: 16px;
}
.win-setting-text {
  flex: 1;
}
.win-setting-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--win-text);
}
.win-setting-desc {
  font-size: 12px;
  color: var(--win-text-2);
  margin-top: 1px;
}

.win-setting-control {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* ---------- Windows 11 Interactive Controls ---------- */

/* Win11 Pill Toggle Switch */
.win-toggle {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 22px;
  vertical-align: middle;
}
.win-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}
.win-slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--win-surface-alt);
  border: 1px solid var(--win-border-strong);
  border-radius: 12px;
  transition: background 0.22s cubic-bezier(0.2, 0.9, 0.2, 1), border-color 0.22s cubic-bezier(0.2, 0.9, 0.2, 1);
}
.win-slider::before {
  position: absolute;
  content: "";
  height: 12px;
  width: 12px;
  left: 4px;
  bottom: 4px;
  background: var(--win-text-2);
  border-radius: 50%;
  transition: transform 0.22s cubic-bezier(0.2, 0.9, 0.2, 1), width 0.15s ease, background 0.2s ease;
}
.win-toggle:hover .win-slider::before {
  background: var(--win-text);
}
.win-toggle input:checked + .win-slider {
  background: var(--win-pill-active);
  border-color: var(--win-pill-active);
}
.win-toggle input:checked + .win-slider::before {
  transform: translateX(22px);
  background: var(--win-accent-text);
}
.win-toggle:active .win-slider::before {
  width: 15px;
}

/* Win11 Input Fields */
.win-input {
  width: 100%;
  background: var(--win-surface-alt);
  border: 1px solid var(--win-border);
  border-bottom: 2px solid var(--win-border-strong);
  border-radius: var(--win-r);
  padding: 10px 14px;
  color: var(--win-text);
  font-family: inherit;
  font-size: 13px;
  outline: none;
  transition: all 0.15s ease;
}
.win-input:focus {
  background: var(--win-surface);
  border-color: var(--win-border);
  border-bottom-color: var(--win-accent);
  box-shadow: 0 0 0 1px var(--win-accent-bg);
}
textarea.win-input {
  resize: vertical;
  min-height: 80px;
  font-family: var(--win-mono);
  font-size: 12px;
}

/* Win11 Action Buttons */
.win-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: var(--win-r);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s cubic-bezier(0, 0, 0, 1);
  text-decoration: none;
}
.win-btn:active {
  transform: scale(0.985);
}
.win-btn-primary {
  background: var(--win-accent);
  color: var(--win-accent-text);
  border-color: var(--win-accent);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}
.win-btn-primary:hover {
  background: var(--win-accent-hover);
  color: var(--win-accent-text);
  border-color: var(--win-accent-hover);
}
.win-btn-primary:active {
  background: var(--win-accent-active);
  color: var(--win-accent-text);
  border-color: var(--win-accent-active);
}
.win-btn-standard {
  background: var(--win-surface-alt);
  border-color: var(--win-border);
  color: var(--win-text);
}
.win-btn-standard:hover {
  background: var(--win-surface-hover);
  border-color: var(--win-border-strong);
}
.win-btn-standard:active {
  background: var(--win-surface-active);
}

/* File Table in Storage section */
.win-file-table {
  width: 100%;
  border-collapse: collapse;
}
.win-file-table th {
  text-align: left;
  padding: 10px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--win-text-3);
  border-bottom: 1px solid var(--win-border);
}
.win-file-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--win-border-subtle);
  font-size: 13px;
}
.win-file-table tr:hover td {
  background: var(--win-surface-hover);
}


/* Footer Specifications */
.win-footer-specs {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--win-border-subtle);
  text-align: center;
  font-size: 12px;
  color: var(--win-text-3);
}

/* ==========================================================================
   Mobile Navigation Controls (Desktop Hidden)
   ========================================================================== */
.win-btn-mobile-nav {
  display: none;
}
.win-sidebar-mobile-header {
  display: none;
}
.win-mobile-backdrop {
  display: none;
}
.win-mobile-bottom-nav {
  display: none;
}
.win-table-responsive {
  width: 100%;
}

/* ==========================================================================
   DWNY Legacy & Batch Tool (audl / auul) Modern Fluent Classes
   ========================================================================== */
.rl-container {
  max-width: 1100px;
  margin: 20px auto;
  padding: 0 16px;
}
.rl-card {
  background: var(--win-surface);
  border: 1px solid var(--win-border);
  border-radius: var(--win-r-lg);
  box-shadow: var(--win-shadow-card);
  padding: 24px;
  margin-bottom: 20px;
}
.rl-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--win-border-subtle);
}
.rl-card-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--win-r);
  background: var(--win-accent-bg);
  color: var(--win-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.rl-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--win-text);
}
.rl-card-subtitle {
  font-size: 12px;
  color: var(--win-text-3);
  margin-top: 2px;
}
.rl-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--win-border-subtle);
  padding-bottom: 8px;
}
.rl-tab {
  background: transparent;
  border: 0;
  padding: 8px 16px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--win-text-2);
  border-radius: var(--win-r);
  cursor: pointer;
  transition: all 0.15s ease;
}
.rl-tab:hover {
  background: var(--win-surface-hover);
  color: var(--win-text);
}
.rl-tab.active {
  background: var(--win-accent);
  color: var(--win-accent-text);
  font-weight: 600;
}
.rl-form-group {
  margin-bottom: 14px;
}
.rl-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--win-text-2);
  margin-bottom: 6px;
}
.rl-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--win-text);
  cursor: pointer;
}
.rl-checkbox input[type="checkbox"] {
  accent-color: var(--win-accent);
  width: 16px;
  height: 16px;
  cursor: pointer;
}
.rl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 20px;
  border-radius: var(--win-r);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  text-decoration: none;
}
.rl-btn-primary {
  background: var(--win-accent);
  color: var(--win-accent-text);
  border-color: var(--win-accent);
}
.rl-btn-primary:hover {
  background: var(--win-accent-hover);
}
.rl-btn-secondary {
  background: var(--win-surface-alt);
  color: var(--win-text);
  border-color: var(--win-border);
}
.rl-btn-secondary:hover {
  background: var(--win-surface-hover);
}

/* ==========================================================================
   Responsive Mobile Design Rules
   ========================================================================== */
@media (max-width: 860px) {
  /* Window & App Shell */
  body {
    background: var(--win-bg);
  }
  body.win-nav-open {
    overflow: hidden;
  }
  .win-app-window {
    margin: 0;
    border: none;
    border-radius: 0;
    width: 100%;
    max-width: 100%;
    min-height: 100vh;
    box-shadow: none;
  }

  /* Title Bar Mobile */
  .win-titlebar {
    padding: 0 10px;
    height: 48px;
    position: sticky;
    top: 0;
    z-index: 800;
    background: var(--win-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--win-border);
  }
  .win-titlebar-left {
    gap: 8px;
  }
  .win-btn-mobile-nav {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--win-r);
    border: 1px solid var(--win-border);
    background: var(--win-surface-alt);
    color: var(--win-text);
    cursor: pointer;
    transition: all 0.15s ease;
    flex-shrink: 0;
  }
  .win-btn-mobile-nav:active {
    background: var(--win-surface-active);
    transform: scale(0.96);
  }
  .win-titlebar-center {
    display: none !important;
  }
  .win-controls {
    display: none !important;
  }
  .win-titlebar-action {
    padding: 5px 10px;
    font-size: 12px;
    margin-right: 4px;
  }
  .win-theme-toggle-btn {
    padding: 5px 10px;
    font-size: 12px;
    margin-right: 4px;
  }
  .win-titlebar-tag {
    font-size: 10px;
    padding: 1px 6px;
  }

  /* Settings Shell & Navigation */
  .win-settings-shell {
    display: block;
    min-height: auto;
  }

  /* Left Sidebar Drawer on Mobile */
  .win-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 310px;
    max-width: 86vw;
    height: 100vh;
    height: 100dvh;
    background: var(--win-surface);
    z-index: 1000;
    transform: translateX(-100%);
    transition: transform 0.28s cubic-bezier(0.1, 0.9, 0.2, 1);
    box-shadow: 0 0 32px rgba(0, 0, 0, 0.5);
    overflow-y: auto;
    padding: 16px 14px 40px;
    border-right: 1px solid var(--win-border);
    display: flex;
    flex-direction: column;
  }
  .win-sidebar.open {
    transform: translateX(0);
  }
  .win-sidebar-mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 12px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--win-border);
    font-size: 14px;
    font-weight: 700;
    color: var(--win-text);
  }
  .win-sidebar-close {
    background: transparent;
    border: 0;
    font-size: 26px;
    line-height: 1;
    color: var(--win-text-2);
    cursor: pointer;
    padding: 2px 8px;
    border-radius: var(--win-r-sm);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .win-sidebar-close:hover,
  .win-sidebar-close:active {
    background: var(--win-surface-hover);
    color: var(--win-text);
  }

  /* Backdrop Overlay */
  .win-mobile-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 998;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }
  .win-mobile-backdrop.open {
    opacity: 1;
    pointer-events: auto;
  }

  /* Content Canvas Mobile (Proper Bottom Padding to Clear Fixed 4-Tab Nav) */
  .win-content-canvas {
    padding: 14px 12px calc(80px + env(safe-area-inset-bottom, 0px)) 12px;
    max-height: none;
    overflow-y: visible;
  }

  /* Typography */
  .win-page-title {
    font-size: 22px;
  }
  .win-page-subtitle {
    font-size: 12px;
  }

  /* Hero Device Card Mobile */
  .win-device-card {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    padding: 14px 16px;
    margin-bottom: 16px;
  }
  .win-device-left {
    width: 100%;
  }
  .win-storage-gauge {
    width: 100%;
    min-width: 0;
  }

  /* Form Ergonomics & Touch Targets (16px avoids iOS zoom) */
  .win-input,
  select.win-input,
  input[type="text"].win-input,
  input[type="password"].win-input,
  input[type="text"],
  input[type="password"],
  select,
  textarea {
    font-size: 16px !important;
    min-height: 42px;
  }
  .win-btn {
    min-height: 42px;
    padding: 10px 16px;
  }
  .win-form-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
  }
  .win-form-actions .win-btn {
    width: 100%;
    justify-content: center;
  }

  /* Settings Rows Mobile Reflow */
  .win-setting-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 14px;
  }
  .win-setting-main {
    width: 100%;
  }

  /* Table Smooth Touch Panning */
  .win-table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--win-border);
    border-radius: var(--win-r);
    margin-bottom: 16px;
  }
  .win-file-table th,
  .win-file-table td {
    padding: 8px 10px;
    font-size: 12px;
    white-space: nowrap;
  }
  .win-file-table td a {
    display: inline-block;
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    vertical-align: middle;
  }

  /* Footer Specs */
  .win-footer-specs {
    margin-bottom: 64px;
    padding-bottom: 24px;
  }

  /* Windows 11 Fluent Mobile Bottom Navigation Bar (4 Balanced Tabs) */
  .win-mobile-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(58px + env(safe-area-inset-bottom, 0px));
    z-index: 900;
    background: var(--win-surface);
    border-top: 1px solid var(--win-border);
    justify-content: space-around;
    align-items: flex-start;
    padding: 4px 4px env(safe-area-inset-bottom, 0px);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.12);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }
  .win-mob-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    height: 50px;
    border: 0;
    background: transparent;
    color: var(--win-text-3);
    font-family: inherit;
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    position: relative;
    padding: 4px 0;
    -webkit-tap-highlight-color: transparent;
  }
  .win-mob-item.active {
    color: var(--win-accent);
    font-weight: 600;
  }
  .win-mob-item.active::after {
    content: '';
    position: absolute;
    top: -4px;
    width: 28px;
    height: 3px;
    background: var(--win-accent);
    border-radius: 0 0 3px 3px;
  }
  .win-mob-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
  }
}

@media (max-width: 540px) {
  .win-card {
    padding: 14px;
  }
  .win-setting-name {
    font-size: 13px;
  }
  .win-setting-desc {
    font-size: 11px;
  }
  /* Compact mobile titlebar */
  .win-titlebar-tag {
    display: none !important;
  }
  .win-theme-label {
    display: none !important;
  }
  .win-titlebar-action span {
    display: none !important;
  }
  .win-titlebar-action,
  .win-theme-toggle-btn {
    padding: 6px !important;
    min-width: 34px !important;
    height: 34px !important;
    justify-content: center !important;
    border-radius: var(--win-r) !important;
  }

  /* Reflow 2-column inline grids to 1 column */
  div[style*="grid-template-columns: 1fr 1fr"],
  div[style*="grid-template-columns:1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }
}