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

:root {
  /* Color Palette - Dark Futuristic Theme */
  --bg-primary: #0a0e27;
  --bg-secondary: #1a1f3a;
  --bg-card: rgba(20, 25, 45, 0.8);
  --bg-card-hover: rgba(25, 30, 50, 0.9);

  /* Neon Accents */
  --accent-cyan: #00d4ff;
  --accent-blue: #0099ff;
  --accent-purple: #6366f1;

  /* Priority Colors */
  --priority-low: #10b981;
  --priority-medium: #f59e0b;
  --priority-high: #ef4444;

  /* Text Colors */
  --text-primary: #e0e7ff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Glow Effects */
  --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.3);
  --glow-blue: 0 0 20px rgba(0, 153, 255, 0.3);
  --glow-strong: 0 0 30px rgba(0, 212, 255, 0.5);

  /* Typography */
  --font-primary:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

body {
  font-family: var(--font-primary);
  background: linear-gradient(
    135deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 100%
  );
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent-cyan), var(--accent-blue));
  border-radius: 10px;
}

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

/* ======================
   Navigation Header
   ====================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 39, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.2);
  padding: var(--spacing-md) 0;
}

.nav-container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--accent-cyan);
  filter: drop-shadow(var(--glow-cyan));
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--accent-cyan);
  transform: translateY(-2px);
}
/* ======================
   Main Layout
   ====================== */
.main-container {
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  display: grid;
  grid-template-columns: 300px 1fr 350px;
  gap: var(--spacing-xl);
  align-items: start;
}

/* Card Component */
.card {
  background: var(--bg-card);
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  backdrop-filter: blur(10px);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.3),
    var(--glow-cyan);
  transition: all var(--transition-normal);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.4),
    var(--glow-strong);
  transform: translateY(-2px);
}

/* ======================
   Left Column - Calendar & Daily Tasks
   ====================== */
.left-column {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* Calendar Section */
.calendar-section {
  padding: var(--spacing-lg);
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.calendar-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.calendar-nav-btn {
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-sm);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--accent-cyan);
  transition: all var(--transition-fast);
}

.calendar-nav-btn svg {
  width: 18px;
  height: 18px;
}

.calendar-nav-btn:hover {
  background: rgba(0, 212, 255, 0.2);
  box-shadow: var(--glow-cyan);
  transform: scale(1.1);
}

.calendar-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  margin-bottom: var(--spacing-xs);
}

.calendar-weekdays span {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.calendar-dates {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.calendar-date {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-primary);
}

.calendar-date:hover {
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent-cyan);
}

.calendar-date.today {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: var(--bg-primary);
  font-weight: 700;
  box-shadow: var(--glow-cyan);
}

.calendar-date.other-month {
  color: var(--text-muted);
  opacity: 0.4;
}

/* Daily Tasks Section */
.daily-tasks-section {
  padding: var(--spacing-lg);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.section-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.daily-progress {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
}

/* Add Daily Task Form */
.add-daily-task-form {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.daily-task-input {
  flex: 1;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.daily-task-input:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
  background: rgba(0, 0, 0, 0.4);
}

.daily-task-input::placeholder {
  color: var(--text-muted);
}

.add-daily-btn {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  border: none;
  border-radius: var(--radius-sm);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--bg-primary);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.add-daily-btn svg {
  width: 16px;
  height: 16px;
}

.add-daily-btn:hover {
  transform: scale(1.1);
  box-shadow: var(--glow-cyan);
}

.add-daily-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.daily-tasks-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.daily-task-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
  animation: slideIn 0.3s ease;
}

.daily-task-item:hover {
  background: rgba(0, 212, 255, 0.05);
}

.daily-task-item:hover .daily-task-actions {
  opacity: 1;
  visibility: visible;
}

.daily-task-item.completed {
  opacity: 0.6;
}

.daily-task-item.completed .daily-task-name {
  text-decoration: line-through;
  color: var(--text-muted);
}

.daily-task-checkbox {
  width: 20px;
  height: 20px;
  border: 2px solid var(--accent-cyan);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  position: relative;
}

.daily-task-checkbox:hover {
  box-shadow: var(--glow-cyan);
  transform: scale(1.1);
}

.daily-task-checkbox.checked {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
}

.daily-task-checkbox.checked::after {
  content: "✓";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--bg-primary);
  font-weight: bold;
  font-size: 0.875rem;
}

.daily-task-name {
  font-size: 0.9rem;
  color: var(--text-primary);
  flex: 1;
  word-break: break-word;
}

.daily-task-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.daily-task-action-btn {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: var(--radius-sm);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  padding: 0;
}

.daily-task-action-btn svg {
  width: 12px;
  height: 12px;
}

.daily-task-action-btn:hover {
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.daily-task-action-btn.delete:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--priority-high);
  color: var(--priority-high);
}

.daily-task-hint {
  margin-top: var(--spacing-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

.empty-daily-tasks {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-sm);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ======================
   Center Column - Task Manager
   ====================== */
.center-column {
  min-height: 600px;
}

.todo-manager {
  padding: var(--spacing-xl);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Add Task Form */
.add-task-form {
  background: rgba(0, 0, 0, 0.2);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-xl);
  border: 1px solid rgba(0, 212, 255, 0.1);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.input-field {
  width: 100%;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.input-field:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
  background: rgba(0, 0, 0, 0.4);
}

.input-field::placeholder {
  color: var(--text-muted);
}

.textarea-field {
  resize: vertical;
  min-height: 60px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.select-field {
  cursor: pointer;
}

/* Date Input Wrapper with Icon */
.date-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.date-icon {
  position: absolute;
  left: var(--spacing-sm);
  width: 20px;
  height: 20px;
  color: var(--accent-cyan);
  pointer-events: none;
  z-index: 1;
}

.date-field {
  padding-left: calc(var(--spacing-md) + 28px) !important;
  cursor: pointer;
  color-scheme: dark;
}

.date-field::-webkit-calendar-picker-indicator {
  cursor: pointer;
  filter: invert(0.7) sepia(1) saturate(5) hue-rotate(175deg);
  opacity: 0.8;
  transition: all var(--transition-fast);
}

.date-field::-webkit-calendar-picker-indicator:hover {
  opacity: 1;
  transform: scale(1.1);
}

.date-field:focus {
  padding-left: calc(var(--spacing-md) + 28px) !important;
}

/* Buttons */
.btn-primary,
.btn-secondary {
  font-family: var(--font-primary);
  font-size: 0.9rem;
  font-weight: 600;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: var(--bg-primary);
  box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-strong);
}

.btn-primary svg {
  width: 18px;
  height: 18px;
}

.btn-secondary {
  background: rgba(100, 116, 139, 0.2);
  color: var(--text-secondary);
  border: 1px solid rgba(100, 116, 139, 0.3);
}

.btn-secondary:hover {
  background: rgba(100, 116, 139, 0.3);
  color: var(--text-primary);
}

/* Task Filters */
.task-filters {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.filter-btn {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--text-secondary);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.filter-btn.active {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: var(--bg-primary);
  border-color: transparent;
  box-shadow: var(--glow-cyan);
}

/* Tasks List */
.tasks-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.task-item {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(0, 212, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
  transition: all var(--transition-fast);
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.task-item:hover {
  background: rgba(0, 0, 0, 0.3);
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateX(4px);
}

.task-item.completed {
  opacity: 0.7;
}

.task-item.completed .task-title {
  text-decoration: line-through;
  color: var(--text-muted);
}

.task-checkbox {
  width: 24px;
  height: 24px;
  border: 2px solid var(--accent-cyan);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  position: relative;
  margin-top: 2px;
}

.task-checkbox:hover {
  box-shadow: var(--glow-cyan);
  transform: scale(1.1);
}

.task-checkbox.checked {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
}

.task-checkbox.checked::after {
  content: "✓";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--bg-primary);
  font-weight: bold;
  font-size: 1rem;
}

.task-content {
  flex: 1;
  min-width: 0;
}

.task-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.task-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.5;
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xs);
}

.task-due-date,
.task-priority {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.task-due-date {
  background: rgba(99, 102, 241, 0.2);
  color: var(--accent-purple);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.task-priority {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.task-priority.low {
  background: rgba(16, 185, 129, 0.2);
  color: var(--priority-low);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.task-priority.medium {
  background: rgba(245, 158, 11, 0.2);
  color: var(--priority-medium);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.task-priority.high {
  background: rgba(239, 68, 68, 0.2);
  color: var(--priority-high);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.task-actions {
  display: flex;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

.task-action-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 212, 255, 0.2);
  background: rgba(0, 0, 0, 0.2);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.task-action-btn svg {
  width: 16px;
  height: 16px;
}

.task-action-btn:hover {
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: scale(1.1);
}

.task-action-btn.delete:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--priority-high);
  color: var(--priority-high);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-muted);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-md);
  opacity: 0.3;
}

/* ======================
   Right Column - Analytics
   ====================== */
.right-column {
  display: flex;
  flex-direction: column;
}

.analytics-section {
  padding: var(--spacing-xl);
}

.chart-container {
  margin-bottom: var(--spacing-xl);
}

.chart-container:last-child {
  margin-bottom: 0;
}

.chart-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

canvas {
  max-height: 250px;
}

/* ======================
   Modal
   ====================== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease;
}

.modal.active {
  display: flex;
}

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

.modal-content {
  background: var(--bg-card);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 500px;
  width: 90%;
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.5),
    var(--glow-strong);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.modal-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

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

.modal-close svg {
  width: 20px;
  height: 20px;
}

.modal-close:hover {
  background: rgba(239, 68, 68, 0.1);
  color: var(--priority-high);
}

.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-lg);
}

/* ======================
   Responsive Design
   ====================== */
@media (max-width: 1200px) {
  .main-container {
    grid-template-columns: 280px 1fr 320px;
    gap: var(--spacing-md);
  }
}

@media (max-width: 992px) {
  .main-container {
    grid-template-columns: 1fr;
  }

  .left-column,
  .right-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }

  .main-container {
    padding: var(--spacing-md);
  }

  .left-column,
  .right-column {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .logo h1 {
    font-size: 1.25rem;
  }

  .logo-icon {
    width: 24px;
    height: 24px;
  }

  .calendar-dates {
    gap: 2px;
  }

  .calendar-date {
    font-size: 0.75rem;
  }
}