/* ==========================================================================
   Tickr - Theme & Variables Setup
   ========================================================================== */

:root {
  /* Color Palette - Dark Theme Defaults */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --bg-card-hover: #26354a;
  --bg-input: #0f172a;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border-color: #334155;
  --border-focus: #3b82f6;
  
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: rgba(59, 130, 246, 0.15);
  
  --success: #10b981;
  --success-hover: #059669;
  --success-light: rgba(16, 185, 129, 0.15);
  
  --warning: #f59e0b;
  --warning-light: rgba(245, 158, 11, 0.15);
  
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-light: rgba(239, 68, 68, 0.15);

  --accent: #8b5cf6;
  --accent-light: rgba(139, 92, 246, 0.15);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.3);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --border-color: #e2e8f0;
  --border-focus: #2563eb;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.2);
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-0: 0;
}

.hidden {
  display: none !important;
}

/* ==========================================================================
   Layout & Container
   ========================================================================== */

.app-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.brand-icon {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #ffffff;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
}

.brand h1 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.current-date {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ==========================================================================
   Buttons & Inputs
   ========================================================================== */

button {
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.primary-btn {
  background-color: var(--primary);
  color: #ffffff;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: 0 2px 4px rgba(59, 130, 246, 0.25);
}

.primary-btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

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

.secondary-btn {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 0.625rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.secondary-btn:hover {
  background-color: var(--border-color);
  color: var(--text-primary);
}

.danger-btn {
  background-color: var(--danger);
  color: #ffffff;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
}

.danger-btn:hover {
  background-color: var(--danger-hover);
}

.icon-btn {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
}

.icon-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.icon-btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.icon-btn-ghost:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

/* Theme Toggle Icons */
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

/* ==========================================================================
   Stats Banner
   ========================================================================== */

.stats-banner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--text-muted);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.primary-tint { background-color: var(--primary-light); color: var(--primary); }
.success-tint { background-color: var(--success-light); color: var(--success); }
.warning-tint { background-color: var(--warning-light); color: var(--warning); }
.accent-tint { background-color: var(--accent-light); color: var(--accent); }

.stat-info {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ==========================================================================
   Controls Bar
   ========================================================================== */

.controls-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.search-box {
  position: relative;
  flex: 1;
  min-width: 240px;
}

.search-box svg {
  position: absolute;
  left: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-box input {
  width: 100%;
  padding: 0.625rem 1rem 0.625rem 2.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.filter-group {
  display: flex;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  gap: 0.25rem;
}

.filter-btn {
  background: transparent;
  color: var(--text-secondary);
  padding: 0.4rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
}

.filter-btn:hover {
  color: var(--text-primary);
}

.filter-btn.active {
  background-color: var(--primary);
  color: #ffffff;
  font-weight: 600;
}

.select-input {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  outline: none;
  cursor: pointer;
}

.select-input:focus {
  border-color: var(--primary);
}

/* ==========================================================================
   Task Grid & Task Cards
   ========================================================================== */

.task-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.task-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  overflow: hidden;
}

.task-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-color: var(--task-color, var(--primary));
}

.task-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--bg-tertiary);
}

.task-card.is-completed {
  border-color: rgba(16, 185, 129, 0.4);
  background: linear-gradient(180deg, var(--bg-card) 0%, rgba(16, 185, 129, 0.03) 100%);
}

.task-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
}

.task-title-group {
  flex: 1;
}

.task-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.task-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  word-break: break-word;
}

.task-description {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-top: 0.25rem;
}

.task-meta-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.625rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.badge-interval {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-streak {
  background-color: var(--warning-light);
  color: var(--warning);
}

.badge-reset-timer {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 500;
}

.task-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Progress Bar */
.progress-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  font-weight: 600;
}

.progress-text {
  color: var(--text-secondary);
}

.progress-count {
  color: var(--text-primary);
}

.progress-track {
  width: 100%;
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--task-color, var(--primary)), var(--primary));
  border-radius: var(--radius-full);
  transition: width var(--transition-bounce);
}

.task-card.is-completed .progress-fill {
  background: var(--success);
}

/* Checkbox Grid Component */
.checks-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.checks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
  gap: 0.5rem;
}

.check-box-btn {
  aspect-ratio: 1;
  background-color: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all var(--transition-bounce);
}

.check-box-btn:hover {
  border-color: var(--task-color, var(--primary));
  color: var(--text-primary);
  transform: scale(1.05);
}

.check-box-btn.checked {
  background-color: var(--task-color, var(--primary));
  border-color: var(--task-color, var(--primary));
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.check-box-btn.checked svg {
  display: block;
}

.check-box-btn svg {
  display: none;
  width: 18px;
  height: 18px;
}

.check-box-btn .check-num {
  font-size: 0.8125rem;
}

.check-box-btn.checked .check-num {
  display: none;
}

/* Completion Ribbon / Celebration Banner */
.completed-banner {
  background-color: var(--success-light);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--success);
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  animation: popIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

/* ==========================================================================
   Empty State
   ========================================================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
  background-color: var(--bg-card);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  margin-top: 1rem;
}

.empty-illustration {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  max-width: 400px;
  margin-bottom: 1.5rem;
}

/* ==========================================================================
   Modals
   ========================================================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 100;
  opacity: 1;
  transition: opacity var(--transition-fast);
}

.modal-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalSlideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-card.modal-sm {
  max-width: 420px;
}

@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background-color: var(--bg-card);
}

/* Form Controls inside Modals */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

@media (max-width: 480px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group .required {
  color: var(--danger);
}

.form-group .optional {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.8125rem;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.625rem 0.875rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Number Input Step Wrapper */
.number-input-wrapper {
  display: flex;
  align-items: center;
}

.number-input-wrapper input {
  text-align: center;
  border-radius: 0;
  -moz-appearance: textfield;
}

.number-input-wrapper input::-webkit-outer-spin-button,
.number-input-wrapper input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.num-step-btn {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 42px;
  height: 38px;
  font-size: 1.125rem;
  font-weight: 700;
}

.num-step-btn:first-child {
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.num-step-btn:last-child {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.num-step-btn:hover {
  background-color: var(--border-color);
}

/* Color Picker Swatches */
.color-picker-grid {
  display: flex;
  gap: 0.625rem;
  flex-wrap: wrap;
}

.color-swatch {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform var(--transition-bounce), border-color var(--transition-fast);
}

.color-swatch:hover {
  transform: scale(1.15);
}

.color-swatch.active {
  border-color: #ffffff;
  box-shadow: 0 0 0 2px var(--primary);
  transform: scale(1.1);
}

/* Data Drawer Boxes */
.dialog-text {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.data-actions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 520px) {
  .data-actions-grid {
    grid-template-columns: 1fr;
  }
}

.data-box {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.data-box h3 {
  font-size: 0.9375rem;
  font-weight: 700;
}

.data-box p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  flex: 1;
}

.file-upload-label {
  cursor: pointer;
  position: relative;
  text-align: center;
}

.hidden-file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.danger-zone {
  border-color: rgba(239, 68, 68, 0.3);
  background-color: var(--danger-light);
}

.danger-btns {
  display: flex;
  gap: 0.75rem;
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */

.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 200;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  animation: toastIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 360px;
}

.toast.toast-success {
  border-left: 4px solid var(--success);
}

.toast.toast-info {
  border-left: 4px solid var(--primary);
}

.toast.toast-warning {
  border-left: 4px solid var(--warning);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ==========================================================================
   Responsive Queries
   ========================================================================== */

@media (max-width: 768px) {
  .app-container {
    padding: 1.25rem 1rem 3rem;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .header-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .controls-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-group {
    justify-content: center;
  }

  .task-grid {
    grid-template-columns: 1fr;
  }
}