/**
 * Custom Theme - Unique Design System
 * Modern, vibrant, and visually distinctive styling
 */

/* Custom CSS Variables */
:root {
  /* Primary Color Palette - Vibrant Gradients */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --danger-gradient: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
  
  /* Background Colors - Deep & Rich */
  --bg-primary: #0f0f23;
  --bg-secondary: #16213e;
  --bg-tertiary: #1a2332;
  --bg-card: rgba(22, 33, 62, 0.8);
  --bg-card-hover: rgba(22, 33, 62, 0.95);
  --bg-glass: rgba(255, 255, 255, 0.05);
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #b8c5d6;
  --text-muted: #7c8db5;
  --text-accent: #64b5f6;
  
  /* Border & Shadow */
  --border-color: rgba(255, 255, 255, 0.1);
  --border-accent: rgba(102, 126, 234, 0.3);
  --shadow-glow: 0 8px 32px rgba(102, 126, 234, 0.15);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  
  /* Animations */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Global Styles */
* {
  box-sizing: border-box;
}

/* Chart containers: clamp height and prevent resize/transition loops */
.chart-wrapper {
  position: relative;
  height: 280px !important;
  min-height: 220px;
  max-height: 340px;
  overflow: hidden;
  /* Avoid height transitions causing resize observer feedback with Chart.js */
  transition: none !important;
  contain: size layout paint style;
}
.chart-wrapper canvas {
  display: block; /* remove inline gap */
  width: 100% !important;
  height: 100% !important;
}

body {
  background: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 25% 25%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text-primary);
  overflow-x: hidden;
}

/* Enhanced Sidebar */
.sidebar {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  backdrop-filter: blur(20px);
  border-right: 1px solid var(--border-color);
  box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3);
}

.sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-gradient);
}

/* Logo Enhancement */
.logo {
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
  font-size: 1.5rem;
  text-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

/* Navigation Items */
.nav-item {
  position: relative;
  margin: 0.25rem 0;
  border-radius: 12px;
  transition: var(--transition-smooth);
  overflow: hidden;
}

.nav-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--primary-gradient);
  transition: var(--transition-smooth);
  z-index: -1;
}

.nav-item:hover::before,
.nav-item.active::before {
  left: 0;
}

.nav-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-glow);
}

.nav-item.active {
  background: var(--primary-gradient);
  color: white;
  font-weight: 600;
  box-shadow: var(--shadow-glow);
}

/* Section Headers */
.nav-section-header {
  position: relative;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-accent);
}

.nav-section-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 1rem;
  right: 1rem;
  height: 1px;
  background: linear-gradient(90deg, var(--text-accent), transparent);
}

/* Enhanced Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition-smooth);
}

.card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow), var(--shadow-card);
}

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

/* Task Items */
.task-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  margin-bottom: 1rem;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.task-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition-smooth);
}

.task-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  border-color: var(--border-accent);
}

.task-item:hover::before {
  opacity: 1;
}

.task-item.completed {
  background: rgba(67, 233, 123, 0.1);
  border-color: rgba(67, 233, 123, 0.3);
}

.task-item.completed::before {
  background: var(--success-gradient);
  opacity: 1;
}

/* Custom Checkboxes */
.custom-checkbox {
  position: relative;
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-glass);
  transition: var(--transition-bounce);
  cursor: pointer;
}

.custom-checkbox:hover {
  border-color: var(--text-accent);
  box-shadow: 0 0 12px rgba(100, 181, 246, 0.3);
}

.custom-checkbox.checked {
  background: var(--success-gradient);
  border-color: transparent;
  transform: scale(1.1);
}

.custom-checkbox.checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-weight: bold;
  font-size: 14px;
}

/* Priority Indicators */
.priority-high {
  background: var(--danger-gradient);
  color: white;
  box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.priority-medium {
  background: var(--warning-gradient);
  color: white;
  box-shadow: 0 4px 12px rgba(247, 112, 154, 0.3);
}

.priority-low {
  background: var(--success-gradient);
  color: white;
  box-shadow: 0 4px 12px rgba(67, 233, 123, 0.3);
}

/* Enhanced Buttons */
.btn {
  position: relative;
  border: none;
  border-radius: 12px;
  font-weight: 600;
  transition: var(--transition-bounce);
  overflow: hidden;
  cursor: pointer;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: var(--transition-smooth);
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: var(--secondary-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(240, 147, 251, 0.3);
}

.btn-accent {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(79, 172, 254, 0.3);
}

/* Enhanced Input Fields */
.form-input {
  background: var(--bg-glass);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  transition: var(--transition-smooth);
  backdrop-filter: blur(10px);
}

.form-input:focus {
  border-color: var(--text-accent);
  box-shadow: 0 0 20px rgba(100, 181, 246, 0.2);
  background: rgba(255, 255, 255, 0.08);
}

/* Statistics Cards */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-gradient);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

/* Modal Enhancements */
.modal-backdrop {
  background: rgba(15, 15, 35, 0.8);
  backdrop-filter: blur(8px);
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* Progress Bars */
.progress-bar {
  background: var(--bg-glass);
  border-radius: 12px;
  overflow: hidden;
  height: 8px;
  position: relative;
}

.progress-fill {
  background: var(--primary-gradient);
  height: 100%;
  border-radius: 12px;
  transition: var(--transition-smooth);
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

/* Tags and Badges */
.tag {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.tag:hover {
  background: var(--bg-card);
  transform: scale(1.05);
}

.tag-category {
  background: var(--accent-gradient);
  color: white;
  border: none;
}

.tag-priority {
  background: var(--warning-gradient);
  color: white;
  border: none;
}

/* Calendar Enhancements */
.calendar-day {
  border-radius: 12px;
  transition: var(--transition-bounce);
  position: relative;
  overflow: hidden;
}

.calendar-day:hover {
  background: var(--bg-card);
  transform: scale(1.05);
}

.calendar-day.has-tasks::before {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  background: var(--primary-gradient);
  border-radius: 50%;
}

.calendar-day.today {
  background: var(--primary-gradient);
  color: white;
  font-weight: bold;
}

/* Loading Animations */
@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

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

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.loading {
  animation: pulse 2s infinite;
}

.floating {
  animation: float 3s ease-in-out infinite;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
}

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

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

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

/* Responsive Design */
@media (max-width: 768px) {
  .card {
    margin: 0.5rem;
    border-radius: 12px;
  }
  
  .task-item {
    margin-bottom: 0.5rem;
    border-radius: 12px;
  }
  
  .stat-number {
    font-size: 2rem;
  }
}

/* Dark Mode Enhancements */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #121828;
    --bg-tertiary: #1a1f35;
  }
}

/* Focus Accessibility */
*:focus {
  outline: 2px solid var(--text-accent);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  .sidebar, .floating-action-btn {
    display: none;
  }
  
  .main-content {
    margin-left: 0;
  }
}

/* Custom Utilities */
.glass-effect {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
}

.glow-effect {
  box-shadow: var(--shadow-glow);
}

.gradient-text {
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hover-lift {
  transition: var(--transition-smooth);
}

.hover-lift:hover {
  transform: translateY(-4px);
}

/* Enhanced Floating Action Button */
.floating-action-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 60px;
  height: 60px;
  background: var(--primary-gradient);
  border-radius: 50%;
  border: none;
  color: white;
  font-size: 1.5rem;
  box-shadow: 0 8px 32px rgba(102, 126, 234, 0.4);
  transition: var(--transition-bounce);
  z-index: 1000;
}

.floating-action-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 12px 40px rgba(102, 126, 234, 0.6);
}

.floating-action-btn:active {
  transform: scale(0.95);
}