/* Default to dark UI chrome; wallpapers are separate. */
:root {
  --primary-bg: #0b1020;
  --secondary-bg: rgba(255, 255, 255, 0.7);
  --tertiary-bg: rgba(255, 255, 255, 0.5);
  --primary-text: rgba(255, 255, 255, 0.92);
  --secondary-text: rgba(255, 255, 255, 0.7);
  --accent-color: #6ea8ff;
  --accent-hover: #8fbaff;
  --border-color: rgba(255, 255, 255, 0.18);

  --glass-blur: 18px;
  --glass-bg: rgba(18, 24, 44, 0.55);
  --glass-bg-strong: rgba(18, 24, 44, 0.72);
  --glass-border: rgba(255, 255, 255, 0.16);
  --glass-highlight: rgba(255, 255, 255, 0.22);

  --shadow-light: rgba(0, 0, 0, 0.18);
  --shadow-medium: rgba(0, 0, 0, 0.28);
  --shadow-heavy: rgba(0, 0, 0, 0.42);

  --window-bg: var(--glass-bg);
  --window-border: var(--glass-border);
  --titlebar-bg: rgba(255, 255, 255, 0.06);
  --titlebar-text: var(--primary-text);
  --titlebar-hover: rgba(255, 255, 255, 0.08);

  --taskbar-bg: rgba(18, 24, 44, 0.45);
  --taskbar-text: var(--primary-text);
  --taskbar-hover: rgba(255, 255, 255, 0.08);

  /* Status Colors */
  --success-color: #28a745;
  --error-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #17a2b8;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Z-Index Layers */
  --z-desktop: 1;
  --z-window-base: 100;
  --z-taskbar: 900;
  --z-context-menu: 950;
  --z-modal: 1000;
}

[data-theme="dark"] {
  --primary-bg: #0b1020;
  --secondary-bg: rgba(255, 255, 255, 0.7);
  --tertiary-bg: rgba(255, 255, 255, 0.5);
  --primary-text: rgba(255, 255, 255, 0.92);
  --secondary-text: rgba(255, 255, 255, 0.68);
  --accent-color: #6ea8ff;
  --accent-hover: #8fbaff;
}

[data-theme="light"] {
  --primary-bg: #f5f7ff;
  --secondary-bg: rgba(0, 0, 0, 0.06);
  --tertiary-bg: rgba(0, 0, 0, 0.04);
  --primary-text: rgba(0, 0, 0, 0.86);
  --secondary-text: rgba(0, 0, 0, 0.62);
  --accent-color: #3b7cff;
  --accent-hover: #2f6cf2;

  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-bg-strong: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(0, 0, 0, 0.12);
  --glass-highlight: rgba(255, 255, 255, 0.55);

  --border-color: rgba(0, 0, 0, 0.12);
  --window-border: rgba(0, 0, 0, 0.12);
  --titlebar-bg: rgba(0, 0, 0, 0.04);
  --titlebar-hover: rgba(0, 0, 0, 0.06);

  --taskbar-bg: rgba(255, 255, 255, 0.45);
  --taskbar-text: rgba(0, 0, 0, 0.86);
  --taskbar-hover: rgba(0, 0, 0, 0.06);
}

/* ==================== RESET & BASE STYLES ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  color: var(--primary-text);
  background-color: var(--primary-bg);
  height: 100%;
  overflow: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==================== UTILITY CLASSES ==================== */
.hidden {
  display: none !important;
}

.no-select {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.dragging {
  cursor: move !important;
  opacity: 0.9;
}

.resizing {
  cursor: nwse-resize !important;
}

.fade-in {
  animation: fadeIn var(--transition-normal);
}

.fade-out {
  animation: fadeOut var(--transition-normal);
}

.scale-in {
  animation: scaleIn var(--transition-normal);
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes scaleIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ==================== SCROLLBAR STYLING ==================== */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--tertiary-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--secondary-text);
}

/* ==================== BUTTON BASE STYLES ==================== */
button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  transition: all var(--transition-fast);
}

button:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ==================== INPUT BASE STYLES ==================== */
input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  color: var(--primary-text);
  background-color: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  transition: border-color var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent-color);
}

/* ==================== LOADING SCREEN ==================== */
.loading-screen {
  position: fixed;
  inset: 0;
  background: var(--primary-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-text {
  margin-top: var(--spacing-lg);
  font-size: 1.2rem;
  color: var(--secondary-text);
}