/* ==========================================================================
   Jewel Pomodoro - Design System & Custom Styles
   Colors strictly: #1a98ff, #FFFFFF, #000000
   Fonts: DM Serif Text & Helvetica
   ========================================================================== */

:root {
  /* Color Tokens */
  --jewel-blue: #1a98ff;
  --jewel-blue-glow: rgba(26, 152, 255, 0.35);
  --jewel-blue-subtle: rgba(26, 152, 255, 0.12);
  --jewel-blue-dark: #0077d6;

  /* Dark Theme Defaults */
  --bg-color: #000000;
  --text-main: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.65);
  --card-bg: rgba(18, 18, 22, 0.75);
  --card-border: rgba(26, 152, 255, 0.25);
  --card-border-hover: rgba(26, 152, 255, 0.5);
  --input-bg: rgba(255, 255, 255, 0.06);
  --btn-secondary-bg: rgba(255, 255, 255, 0.08);
  --btn-secondary-hover: rgba(26, 152, 255, 0.2);
  --shadow-color: rgba(0, 0, 0, 0.5);

  /* Fonts */
  --font-serif: 'DM Serif Text', Georgia, serif;
  --font-sans: 'Helvetica', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Layout */
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

[data-theme="light"] {
  --bg-color: #ffffff;
  --text-main: #000000;
  --text-muted: rgba(0, 0, 0, 0.6);
  --card-bg: rgba(245, 248, 255, 0.85);
  --card-border: rgba(26, 152, 255, 0.3);
  --card-border-hover: rgba(26, 152, 255, 0.7);
  --input-bg: rgba(0, 0, 0, 0.04);
  --btn-secondary-bg: rgba(0, 0, 0, 0.05);
  --btn-secondary-hover: rgba(26, 152, 255, 0.15);
  --shadow-color: rgba(26, 152, 255, 0.12);
}

/* Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Background Canvas Particles */
.ambient-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

/* Main Container Layout */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  gap: 24px;
}

/* Glassmorphism Card Utility */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 32px var(--shadow-color);
  transition: var(--transition-smooth);
}

.glass-card:hover {
  border-color: var(--card-border-hover);
}

/* Header Navbar */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.jewel-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 0 8px var(--jewel-blue-glow));
  animation: floatJewel 4s ease-in-out infinite alternate;
}

@keyframes floatJewel {
  0% { transform: translateY(0) rotate(0deg); }
  100% { transform: translateY(-4px) rotate(4deg); }
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--text-main) 40%, var(--jewel-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Icon Buttons */
.icon-btn {
  background: var(--btn-secondary-bg);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  padding: 8px 14px;
  border-radius: 30px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  transition: var(--transition-smooth);
}

.icon-btn:hover {
  background: var(--btn-secondary-hover);
  border-color: var(--jewel-blue);
  box-shadow: 0 0 12px var(--jewel-blue-glow);
  transform: translateY(-2px);
}

.icon-btn.active {
  background: var(--jewel-blue-subtle);
  border-color: var(--jewel-blue);
  color: var(--jewel-blue);
}

.icon-btn.playing {
  animation: pulseAudio 2s infinite;
}

@keyframes pulseAudio {
  0% { box-shadow: 0 0 4px var(--jewel-blue); }
  50% { box-shadow: 0 0 16px var(--jewel-blue); }
  100% { box-shadow: 0 0 4px var(--jewel-blue); }
}

/* Main Grid Layout */
.main-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  flex: 1;
}

@media (max-width: 900px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

/* TIMER SECTION */
.timer-section {
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  text-align: center;
}

.mode-tabs {
  display: flex;
  background: var(--input-bg);
  padding: 6px;
  border-radius: 40px;
  border: 1px solid var(--card-border);
  gap: 4px;
}

.mode-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 8px 18px;
  border-radius: 30px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.mode-btn:hover {
  color: var(--text-main);
}

.mode-btn.active {
  background: var(--jewel-blue);
  color: #ffffff;
  box-shadow: 0 4px 16px var(--jewel-blue-glow);
}

/* Active Focus Task Banner */
.active-task-banner {
  background: var(--jewel-blue-subtle);
  border: 1px solid var(--jewel-blue);
  border-radius: var(--radius-md);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 90%;
  animation: fadeIn 0.3s ease;
}

.active-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--jewel-blue);
  font-weight: 700;
}

.active-title {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

.clear-task-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0 4px;
}

.clear-task-btn:hover {
  color: var(--jewel-blue);
}

/* Circular Timer Progress Display */
.timer-display-container {
  position: relative;
  width: 280px;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 10px 0;
}

.progress-ring {
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}

.progress-ring-bg {
  fill: none;
  stroke: var(--input-bg);
  stroke-width: 10;
}

.progress-ring-circle {
  fill: none;
  stroke: var(--jewel-blue);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 753.98; /* 2 * PI * 120 */
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  filter: drop-shadow(0 0 10px var(--jewel-blue-glow));
}

.timer-text-content {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.mode-badge {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--jewel-blue);
  font-weight: 600;
  margin-bottom: 4px;
}

.timer-clock {
  font-family: var(--font-serif);
  font-size: 4.2rem;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--text-main);
  text-shadow: 0 0 20px rgba(26, 152, 255, 0.2);
}

.session-badge {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Primary Timer Buttons */
.timer-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 40px;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: 1px solid transparent;
}

.primary-btn {
  background: linear-gradient(135deg, var(--jewel-blue), var(--jewel-blue-dark));
  color: #ffffff;
  box-shadow: 0 6px 20px var(--jewel-blue-glow);
  padding: 14px 36px;
}

.primary-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 28px var(--jewel-blue-glow);
}

.primary-btn:active {
  transform: translateY(0) scale(0.98);
}

.secondary-btn {
  background: var(--btn-secondary-bg);
  border-color: var(--card-border);
  color: var(--text-main);
  padding: 14px 16px;
}

.secondary-btn:hover {
  background: var(--btn-secondary-hover);
  border-color: var(--jewel-blue);
  color: var(--jewel-blue);
  transform: translateY(-2px);
}

.keyboard-hints {
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

kbd {
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
}

/* TASKS CHECKLIST SECTION */
.tasks-section {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.tasks-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
}

.task-counter {
  font-size: 0.85rem;
  color: var(--jewel-blue);
  font-weight: 600;
  display: block;
}

.task-filters {
  display: flex;
  background: var(--input-bg);
  border-radius: 20px;
  padding: 3px;
  border: 1px solid var(--card-border);
}

.filter-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.filter-btn.active {
  background: var(--jewel-blue);
  color: #ffffff;
}

/* Form Styling */
.add-task-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--input-bg);
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
}

.form-row {
  display: flex;
  gap: 10px;
}

.task-input {
  flex: 1;
  background: var(--bg-color);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition-smooth);
}

.task-input:focus {
  border-color: var(--jewel-blue);
  box-shadow: 0 0 10px var(--jewel-blue-glow);
}

.add-task-btn {
  background: var(--jewel-blue);
  color: #ffffff;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.option-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pomo-stepper {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-color);
  border: 1px solid var(--card-border);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.stepper-btn {
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  padding: 2px 6px;
}

.stepper-btn:hover {
  color: var(--jewel-blue);
}

.category-select {
  background: var(--bg-color);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  outline: none;
}

/* Tasks List Container */
.tasks-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 340px;
  overflow-y: auto;
  padding-right: 4px;
}

.tasks-list::-webkit-scrollbar {
  width: 6px;
}

.tasks-list::-webkit-scrollbar-thumb {
  background: var(--jewel-blue-glow);
  border-radius: 10px;
}

/* Single Task Item Card */
.task-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  gap: 12px;
  transition: var(--transition-smooth);
}

.task-item:hover {
  border-color: var(--jewel-blue);
  transform: translateX(2px);
}

.task-item.completed {
  opacity: 0.65;
  background: rgba(0, 0, 0, 0.2);
}

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

.task-item.active-focus {
  border: 1.5px solid var(--jewel-blue);
  box-shadow: 0 0 14px var(--jewel-blue-glow);
  background: var(--jewel-blue-subtle);
}

.task-main {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

/* Custom Checkbox */
.custom-checkbox {
  width: 22px;
  height: 22px;
  border: 2px solid var(--jewel-blue);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
  flex-shrink: 0;
}

.custom-checkbox.checked {
  background: var(--jewel-blue);
  box-shadow: 0 0 8px var(--jewel-blue-glow);
}

.custom-checkbox.checked::after {
  content: '✓';
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: bold;
}

.task-details {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}

.task-text {
  font-size: 0.95rem;
  font-weight: 500;
  word-break: break-word;
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.category-tag {
  background: var(--card-border);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.7rem;
}

.task-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.focus-task-btn {
  background: var(--btn-secondary-bg);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.focus-task-btn:hover {
  background: var(--jewel-blue);
  color: #ffffff;
}

.delete-task-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: var(--transition-smooth);
}

.delete-task-btn:hover {
  color: #ff4d4d;
  background: rgba(255, 77, 77, 0.15);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
  gap: 8px;
}

.empty-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
}

.empty-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 260px;
}

/* FOOTER STATS & QUOTE */
.app-footer {
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 20px 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-value {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--jewel-blue);
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--card-border);
}

.quote-container {
  max-width: 320px;
  text-align: center;
}

.tranquil-quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.4;
}

@media (max-width: 768px) {
  .stat-divider {
    display: none;
  }
  .app-footer {
    flex-direction: column;
    text-align: center;
  }
}

/* SETTINGS MODAL */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.3s ease;
}

.modal-card {
  width: 100%;
  max-width: 440px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.close-btn:hover {
  color: var(--text-main);
}

.settings-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
}

.setting-item input[type="number"] {
  width: 70px;
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  text-align: center;
}

.checkbox-setting {
  justify-content: flex-start;
  gap: 10px;
}

.modal-footer {
  margin-top: 10px;
  display: flex;
  justify-content: flex-end;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1000;
}

.toast {
  background: var(--card-bg);
  border: 1px solid var(--jewel-blue);
  color: var(--text-main);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px var(--shadow-color);
  backdrop-filter: blur(12px);
  font-size: 0.9rem;
  animation: slideInRight 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

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

.hidden {
  display: none !important;
}