/* CSS Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Color Palette */
  --bg-primary: #0a0e1a;
  --bg-secondary: #12172b;
  --bg-elevated: #1a2038;
  --accent-primary: #4dabff;
  --accent-secondary: #0066cc;
  --text-primary: #e8ecf4;
  --text-secondary: #9ca3af;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(26, 32, 56, 0.85);
  --glass-border: rgba(77, 171, 255, 0.15);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  
  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.35);
  --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.45);
  
  /* Taskbar */
  --taskbar-height: 56px;
  --taskbar-height-mobile: 60px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'SF Pro Display', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  touch-action: pan-x pan-y;
}

.hidden {
  display: none !important;
}

/* ============================================
   SPLASH SCREEN
   ============================================ */
.splash {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  animation: fadeIn 0.5s ease;
}

.splash-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 30%, rgba(77, 171, 255, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(0, 102, 204, 0.15) 0%, transparent 50%),
    linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  z-index: -1;
}

.splash-content {
  text-align: center;
  max-width: 480px;
  padding: var(--spacing-xl);
  animation: slideUp 0.6s ease;
}

.logo-animation {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--spacing-xl);
  animation: pulse 2s ease-in-out infinite;
}

.logo-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 8px 32px rgba(77, 171, 255, 0.4));
}

.splash-title {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, #4dabff 0%, #fff 50%, #4dabff 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 3s ease-in-out infinite;
}

.splash-subtitle {
  font-size: clamp(1rem, 3vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  font-weight: 400;
}

.splash-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 1rem 2rem;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn:hover::before {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-secondary) 0%, var(--accent-primary) 100%);
  color: white;
  box-shadow: 0 8px 24px rgba(77, 171, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(77, 171, 255, 0.45);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
}

.btn-secondary:hover {
  background: rgba(26, 32, 56, 0.95);
  border-color: rgba(77, 171, 255, 0.3);
}

.splash-hint {
  font-size: 0.875rem;
  color: var(--text-secondary);
  opacity: 0.7;
}

/* ============================================
   WORKSPACE
   ============================================ */
.workspace {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
}

.workspace-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 15% 20%, rgba(77, 171, 255, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(0, 102, 204, 0.08) 0%, transparent 40%),
    linear-gradient(135deg, #0a0e1a 0%, #12172b 50%, #0e1424 100%);
  z-index: 0;
}

/* App Grid (Desktop) */
.app-grid {
  position: absolute;
  top: 8%;
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: var(--spacing-xl);
  max-width: min(90%, 800px);
  padding: var(--spacing-xl);
  z-index: 1;
}

.app-icon {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  border-radius: 16px;
  cursor: pointer;
  transition: all var(--transition-base);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
}

.app-icon-bg {
  position: absolute;
  inset: 0;
  border-radius: 16px;
  background: radial-gradient(circle at 50% 0%, rgba(77, 171, 255, 0.15) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.app-icon:hover .app-icon-bg {
  opacity: 1;
}

.app-icon:hover {
  transform: translateY(-8px) scale(1.05);
  border-color: rgba(77, 171, 255, 0.4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.app-icon:active {
  transform: translateY(-4px) scale(1.02);
}

.app-icon i {
  font-size: 2.5rem;
  color: var(--accent-primary);
  filter: drop-shadow(0 4px 12px rgba(77, 171, 255, 0.4));
  transition: all var(--transition-base);
}

.app-icon:hover i {
  transform: scale(1.1);
}

.app-icon span {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

/* Window Container */
.window-container {
  position: absolute;
  inset: 0;
  bottom: var(--taskbar-height);
  z-index: 10;
  pointer-events: none;
}

.window {
  position: absolute;
  background: var(--bg-elevated);
  border-radius: 12px;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  pointer-events: auto;
  transition: opacity var(--transition-base);
  display: flex;
  flex-direction: column;
}

.window.minimized {
  opacity: 0;
  pointer-events: none;
}

.window.fullscreen {
  inset: 0 !important;
  border-radius: 0;
  width: 100% !important;
  height: calc(100vh - var(--taskbar-height)) !important;
}

.window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  cursor: move;
  user-select: none;
}

.window-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.window-title i {
  color: var(--accent-primary);
  font-size: 1rem;
}

.window-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.window-control {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.window-control:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.window-control.close:hover {
  background: #ef4444;
  color: white;
}

.window-content {
  flex: 1;
  overflow: hidden;
  position: relative;
  background: var(--bg-primary);
}

.window-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: white;
}

.window-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  z-index: 10;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(77, 171, 255, 0.2);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* App Launcher (Mobile) */
.app-launcher {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 100;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.3s ease;
}

.launcher-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.launcher-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
}

.launcher-close {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--glass-bg);
  color: var(--text-primary);
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.launcher-close:hover {
  background: var(--bg-elevated);
}

.launcher-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
  overflow-y: auto;
  align-content: start;
}

.launcher-app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  border-radius: 16px;
  cursor: pointer;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

.launcher-app:active {
  transform: scale(0.95);
  background: var(--bg-elevated);
}

.launcher-app i {
  font-size: 2.5rem;
  color: var(--accent-primary);
}

.launcher-app span {
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  color: var(--text-primary);
}

/* ============================================
   TASKBAR
   ============================================ */
.taskbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--taskbar-height);
  background: var(--glass-bg);
  backdrop-filter: blur(40px);
  border-top: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  gap: var(--spacing-md);
  z-index: 50;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.2);
}

.taskbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--accent-secondary);
  border: none;
  border-radius: 10px;
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  min-width: 80px;
}

.taskbar-menu:hover {
  background: var(--accent-primary);
  transform: translateY(-2px);
}

.taskbar-menu i {
  font-size: 1.125rem;
}

.taskbar-apps {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.taskbar-apps::-webkit-scrollbar {
  display: none;
}

.taskbar-app {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  min-width: 120px;
}

.taskbar-app.active {
  background: var(--bg-primary);
  border-color: var(--accent-primary);
}

.taskbar-app:hover {
  background: var(--bg-primary);
}

.taskbar-app i {
  color: var(--accent-primary);
}

.taskbar-system {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.system-time {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  min-width: 100px;
  text-align: right;
}

.system-user {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-base);
}

.system-user:hover {
  background: var(--bg-primary);
}

.system-user i {
  color: var(--accent-primary);
  font-size: 1.125rem;
}

/* Context Menu */
.context-menu {
  position: fixed;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: var(--spacing-xs);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  min-width: 180px;
}

.context-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.context-item:hover {
  background: var(--bg-secondary);
}

.context-item i {
  color: var(--accent-primary);
  width: 16px;
}

/* ============================================
   RESPONSIVE & MOBILE
   ============================================ */
@media (max-width: 768px) {
  :root {
    --taskbar-height: var(--taskbar-height-mobile);
  }

  .app-grid {
    display: none;
  }

  .taskbar-menu-text,
  .system-user-name {
    display: none;
  }

  .taskbar-menu {
    min-width: auto;
    width: 48px;
    justify-content: center;
    padding: var(--spacing-sm);
  }

  .taskbar-app {
    min-width: auto;
    padding: var(--spacing-sm);
  }

  .taskbar-app span {
    display: none;
  }

  .system-time {
    font-size: 0.75rem;
    min-width: auto;
  }

  .system-user {
    padding: var(--spacing-sm);
  }

  .window.desktop-mode {
    inset: 0 !important;
    width: 100% !important;
    height: calc(100vh - var(--taskbar-height)) !important;
    border-radius: 0;
  }
}

@media (min-width: 769px) {
  .app-launcher {
    display: none !important;
  }
}

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

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

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }
}

@keyframes shimmer {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Smooth scrollbar for webkit */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--accent-secondary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}