:root {
  --bg-color: #f3f4f6;
  --card-bg: #ffffff;
  --text-color: #1f2937;
  --accent-color: #4f46e5;
  --accent-hover: #4338ca;
  --border-color: #e5e7eb;
  --secondary-text: #6b7280;
}

body.dark-mode {
  --bg-color: #111827;
  --card-bg: #1f2937;
  --text-color: #f9fafb;
  --accent-color: #6366f1;
  --accent-hover: #818cf8;
  --border-color: #374151;
  --secondary-text: #9ca3af;
}

body {
  background: var(--bg-color);
  color: var(--text-color);
  transition:
    background 0.3s,
    color 0.3s;
  font-family: "Inter", sans-serif; /* Modern, clean font */
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px;
  margin: 0;
  min-height: 100vh;
}

.theme-toggle {
  align-self: flex-end;
  margin-bottom: 20px;
  max-width: 450px;
  width: 100%;
}

.container {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 16px;
  box-shadow:
    0 20px 25px -5px rgba(0, 0, 0, 0.05),
    0 8px 10px -6px rgba(0, 0, 0, 0.01); /* Softer, layered shadow */
  width: 100%;
  max-width: 450px; /* Slightly wider for better breathing room */
  transition: all 0.3s ease;
}

h1 {
  text-align: center;
  margin-top: 0;
  color: var(--text-color);
  font-weight: 700;
  letter-spacing: -0.5px;
}

/* Form Styles */
form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 25px;
}

.row {
  display: flex;
  gap: 10px;
}
.row input,
.row select {
  flex: 1;
}

input,
select {
  padding: 12px;
  background: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  outline: none;
  font-family: inherit;
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
}

/* Focus Ring for Better UX Accessability */
input:focus,
select:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.add-btn {
  background: var(--accent-color);
  color: white;
  border: none;
  font-weight: 600;
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  transition:
    background 0.2s,
    transform 0.1s;
}

.add-btn:active {
  transform: scale(0.98);
}
.add-btn:hover {
  background: var(--accent-hover);
}

/* Pomodoro */
.pomodoro {
  background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
  color: white;
  padding: 25px;
  border-radius: 12px;
  text-align: center;
  margin-bottom: 30px;
  box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.3);
}

#timer-display {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 15px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -1px;
}

.timer-controls button {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  padding: 8px 20px;
  font-weight: 500;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
}
.timer-controls button:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Filters */
.filter-container {
  display: flex;
  background: var(--bg-color);
  padding: 5px;
  border-radius: 10px;
  margin-bottom: 20px;
}
.filter-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--secondary-text);
  padding: 8px;
  font-weight: 500;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.2s;
}
.filter-btn.active {
  background: var(--card-bg);
  color: var(--text-color);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Task List */
ul {
  padding: 0;
  margin: 0;
  list-style: none;
}
li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  margin-bottom: 8px;
  transition: all 0.2s;
}

li:hover {
  border-color: var(--secondary-text);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.drag-handle {
  color: #ccc;
  cursor: grab;
  margin-right: 12px;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
}
.drag-handle:active {
  cursor: grabbing;
}

.task-content {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  flex: 1;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--accent-color);
  cursor: pointer;
}

.task-text {
  font-weight: 500;
  color: var(--text-color);
}
.completed-task {
  opacity: 0.6;
  background: var(--bg-color);
}
.completed-task .task-text {
  text-decoration: line-through;
  color: var(--secondary-text);
}

/* Actions & Badges */
.actions {
  display: flex;
  gap: 10px;
}
.edit-btn,
.delete-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  opacity: 0.5;
  transition:
    opacity 0.2s,
    transform 0.1s;
}
.edit-btn:hover {
  opacity: 1;
  color: var(--accent-color);
}
.delete-btn:hover {
  opacity: 1;
  color: #ef4444;
}
.edit-btn:active,
.delete-btn:active {
  transform: scale(0.9);
}

.priority-badge {
  font-size: 0.65rem;
  padding: 3px 8px;
  border-radius: 12px;
  text-transform: uppercase;
  font-weight: 700;
  margin-top: 6px;
  display: inline-block;
}
.priority-high {
  background: #fee2e2;
  color: #b91c1c;
}
.priority-medium {
  background: #fef3c7;
  color: #b45309;
}
.priority-low {
  background: #dcfce7;
  color: #15803d;
}

body.dark-mode .priority-high {
  background: #7f1d1d;
  color: #fecaca;
}
body.dark-mode .priority-medium {
  background: #78350f;
  color: #fef3c7;
}
body.dark-mode .priority-low {
  background: #14532d;
  color: #dcfce7;
}

.overdue {
  border-left: 4px solid #ef4444;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--secondary-text);
}

/* Bottom Grid Actions */
.bottom-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 20px;
}
.bottom-actions button {
  padding: 10px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  background: transparent;
}
#smart-sort {
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
}
#smart-sort:hover {
  background: var(--accent-color);
  color: white;
}
#export-pdf {
  color: var(--text-color);
  border: 1px solid var(--border-color);
}
#export-pdf:hover {
  background: var(--border-color);
}
#clear-completed {
  grid-column: span 2;
  color: #ef4444;
  border: 1px dashed #ef4444;
}
#clear-completed:hover {
  background: #ef4444;
  color: white;
}

/* Drag and Drop Extras */
li.dragging {
  opacity: 0.5;
  transform: scale(0.98);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
li.drag-over {
  border-top: 3px solid var(--accent-color);
  margin-top: 10px;
}

@media print {
  form,
  .theme-toggle,
  .filter-container,
  .bottom-actions,
  .pomodoro,
  .actions,
  .drag-handle {
    display: none !important;
  }
  .container {
    box-shadow: none;
    max-width: 100%;
    padding: 0;
  }
  body {
    background: white;
    padding: 0;
  }
  li {
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}

/* --- Custom Scrollbar Styling --- */

/* For Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

/* For Chrome, Edge, and Safari */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
  border-radius: 10px;
}

::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 10px;
  border: 2px solid var(--bg-color); /* Creates a "padding" effect around the thumb */
}

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

#task-list {
  max-height: 50vh; /* Takes up 50% of the viewport height */
  overflow-y: auto;
  padding-right: 5px; /* Prevents the scrollbar from overlapping your delete buttons */
}

/* Top Controls */
.top-controls {
  display: flex;
  justify-content: space-between;
  width: 100%;
  max-width: 450px;
  margin-bottom: 20px;
}
.top-controls button {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 8px 15px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s;
}
.top-controls button:hover {
  border-color: var(--accent-color);
}

/* Modal Overlay */
.modal-overlay {
  display: none; /* Hidden by default */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(3px);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

/* Modal Content */
.modal-content {
  background: var(--card-bg);
  padding: 25px;
  border-radius: 12px;
  width: 90%;
  max-width: 350px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
}

.modal-content h2 {
  margin-top: 0;
  margin-bottom: 20px;
  font-size: 1.5rem;
}

.setting-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 15px;
  gap: 5px;
}
.setting-group label {
  font-weight: 500;
  font-size: 0.9rem;
}
.setting-group input[type="number"] {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-color);
  color: var(--text-color);
  box-sizing: border-box;
}

.toggle-group {
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 25px;
}
.cancel-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 8px 15px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
}

.save-btn {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 8px 15px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

.save-btn:hover {
  background: var(--accent-hover);
}