/* ==========================================================================
   POMODORO TIMER - MODERN & RESPONSIVE DESIGN SYSTEM
   ========================================================================== */

/* Design Tokens & Theme Variables */
:root {
  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Roboto Mono', Menlo, Consolas, monospace;

  /* Common Spacing & Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

  /* Mode Accent Colors (Dynamic) */
  --accent-pomo: #ff5757;
  --accent-pomo-light: rgba(255, 87, 87, 0.15);
  --accent-pomo-glow: rgba(255, 87, 87, 0.35);

  --accent-short: #10b981;
  --accent-short-light: rgba(16, 185, 129, 0.15);
  --accent-short-glow: rgba(16, 185, 129, 0.35);

  --accent-long: #3b82f6;
  --accent-long-light: rgba(59, 130, 246, 0.15);
  --accent-long-glow: rgba(59, 130, 246, 0.35);

  /* Active Mode Accent (updated via JS or data-mode) */
  --accent: var(--accent-pomo);
  --accent-light: var(--accent-pomo-light);
  --accent-glow: var(--accent-pomo-glow);
}

/* Dark Theme (Default) */
[data-theme="dark"] {
  --bg-app: #0f1015;
  --bg-card: rgba(26, 27, 36, 0.7);
  --bg-card-solid: #191a24;
  --bg-input: rgba(35, 36, 48, 0.8);
  --bg-hover: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(255, 255, 255, 0.2);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --ring-track: rgba(255, 255, 255, 0.06);

  --shadow-card: 0 16px 32px -8px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05);
  --shadow-glow: 0 8px 30px var(--accent-glow);
  --modal-backdrop: rgba(0, 0, 0, 0.75);
}

/* Light Theme */
[data-theme="light"] {
  --bg-app: #f4f5f8;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-solid: #ffffff;
  --bg-input: #eef1f6;
  --bg-hover: rgba(0, 0, 0, 0.05);
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-focus: rgba(0, 0, 0, 0.2);

  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --ring-track: rgba(0, 0, 0, 0.06);

  --shadow-card: 0 16px 32px -8px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 8px 30px var(--accent-glow);
  --modal-backdrop: rgba(15, 23, 42, 0.5);
}

/* Dynamic mode classes applied to body */
body[data-current-mode="pomodoro"] {
  --accent: var(--accent-pomo);
  --accent-light: var(--accent-pomo-light);
  --accent-glow: var(--accent-pomo-glow);
}
body[data-current-mode="shortBreak"] {
  --accent: var(--accent-short);
  --accent-light: var(--accent-short-light);
  --accent-glow: var(--accent-short-glow);
}
body[data-current-mode="longBreak"] {
  --accent: var(--accent-long);
  --accent-light: var(--accent-long-light);
  --accent-glow: var(--accent-long-glow);
}

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

html {
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-smooth);
}

/* Ambient dynamic background gradient glow */
body::before {
  content: '';
  position: fixed;
  top: -15%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 500px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0.45;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  transition: background var(--transition-smooth);
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */
.app-container {
  width: 100%;
  max-width: 600px;
  padding: 1.25rem 1.25rem 3rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  user-select: none;
}

.logo-icon {
  font-size: 1.4rem;
  filter: drop-shadow(0 2px 8px var(--accent-glow));
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Buttons Base */
button {
  cursor: pointer;
  border: none;
  font-family: inherit;
  outline: none;
  transition: all var(--transition-fast);
}

.icon-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
}

.icon-btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.icon-btn:active {
  transform: translateY(1px);
}

/* Dark/Light mode icon toggler */
[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;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* ==========================================================================
   MODE TABS
   ========================================================================== */
.mode-tabs {
  display: flex;
  background: var(--bg-card);
  padding: 0.35rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  max-width: 360px;
  margin: 0 auto;
  width: 100%;
}

.mode-tab {
  flex: 1;
  padding: 0.65rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border-radius: var(--radius-full);
  text-align: center;
  white-space: nowrap;
  transition: all var(--transition-normal);
}

.mode-tab:hover {
  color: var(--text-primary);
}

.mode-tab.active {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--accent-glow);
}

/* ==========================================================================
   TIMER SECTION & CIRCULAR PROGRESS
   ========================================================================== */
.timer-section {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.5rem 2rem;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.timer-circle-container {
  position: relative;
  width: clamp(240px, 68vw, 300px);
  height: clamp(240px, 68vw, 300px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.progress-ring {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.progress-ring-track {
  fill: none;
  stroke: var(--ring-track);
  stroke-width: 8;
}

.progress-ring-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 879.64; /* 2 * PI * 140 */
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.6s linear, stroke var(--transition-smooth);
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.timer-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 1rem;
}

.mode-badge {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.35rem;
  transition: color var(--transition-smooth);
}

.timer-display {
  font-family: var(--font-mono);
  font-size: clamp(3.2rem, 13vw, 4.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  margin: 0.2rem 0 0.5rem;
  user-select: none;
}

.active-task-indicator {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  max-width: 220px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--bg-hover);
}

.task-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { opacity: 0.4; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.2); }
}

.task-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Cycle Dots (e.g. 4 steps until long break) */
.cycle-dots-container {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.cycle-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ring-track);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

.cycle-dot.active {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  transform: scale(1.15);
}

.cycle-dot.completed {
  background: var(--accent);
  opacity: 0.6;
}

/* Controls */
.timer-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.75rem;
  width: 100%;
}

.control-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  user-select: none;
}

.primary-btn {
  background: var(--accent);
  color: #ffffff;
  min-width: 150px;
  height: 56px;
  padding: 0 1.8rem;
  font-size: 1.15rem;
  box-shadow: 0 8px 22px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-smooth);
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px var(--accent-glow);
  filter: brightness(1.06);
}

.primary-btn:active {
  transform: translateY(1px);
}

.secondary-btn {
  background: var(--bg-hover);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  height: 48px;
  padding: 0 1.15rem;
  font-size: 0.95rem;
  border-radius: var(--radius-full);
}

.secondary-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.secondary-btn:active {
  transform: translateY(1px);
}

/* Start/Pause icon handling */
body.is-running .play-icon {
  display: none;
}
body.is-running .pause-icon {
  display: block;
}
body:not(.is-running) .play-icon {
  display: block;
}
body:not(.is-running) .pause-icon {
  display: none;
}

.shortcuts-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  margin-top: 1.25rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

kbd {
  font-family: var(--font-mono);
  background: var(--bg-hover);
  border: 1px solid var(--border-subtle);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.72rem;
}

/* ==========================================================================
   TASK SECTION
   ========================================================================== */
.tasks-section {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
}

.tasks-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.tasks-title-wrapper {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.tasks-title-wrapper h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tasks-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--bg-hover);
  color: var(--text-secondary);
}

.text-btn {
  background: transparent;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius-sm);
}

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

/* Task Form */
.task-form {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.task-form input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast);
}

.task-form input:focus {
  border-color: var(--accent);
}

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

.add-task-btn {
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid transparent;
  font-weight: 600;
  padding: 0 1.2rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
}

.add-task-btn:hover {
  background: var(--accent);
  color: #ffffff;
}

/* Task List */
.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 280px;
  overflow-y: auto;
  padding-right: 0.2rem;
}

/* Custom Scrollbar */
.task-list::-webkit-scrollbar {
  width: 5px;
}
.task-list::-webkit-scrollbar-track {
  background: transparent;
}
.task-list::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: var(--radius-full);
}

.task-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 0.9rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.task-item:hover {
  border-color: var(--border-focus);
  background: var(--bg-hover);
}

.task-item.active-focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.task-item-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
  cursor: pointer;
}

.task-checkbox {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  border: 2px solid var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.task-item.completed .task-checkbox {
  background: var(--accent);
  border-color: var(--accent);
}

.task-checkbox svg {
  display: none;
  color: #fff;
}

.task-item.completed .task-checkbox svg {
  display: block;
}

.task-title {
  font-size: 0.95rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  user-select: none;
}

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

.task-item-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.focus-tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--accent-light);
  color: var(--accent);
}

.delete-task-btn {
  background: transparent;
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.delete-task-btn:hover {
  color: #ff5757;
  background: rgba(255, 87, 87, 0.1);
}

.tasks-empty-state {
  display: none;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-muted);
}

.tasks-empty-state .empty-icon {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
  opacity: 0.7;
}

.tasks-empty-state p {
  font-size: 0.85rem;
  max-width: 280px;
}

.task-list:empty + .tasks-empty-state {
  display: flex;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.app-footer {
  text-align: center;
  padding-top: 2rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footer-tip {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-credits {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.82rem;
}

.author-link {
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.author-link:hover {
  color: var(--accent);
}

.footer-dot {
  color: var(--text-muted);
  opacity: 0.6;
}

.terms-link-btn {
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.terms-link-btn:hover {
  color: var(--accent);
}

.copyright-notice {
  font-size: 0.72rem;
  color: var(--text-muted);
  opacity: 0.8;
  max-width: 440px;
  line-height: 1.4;
}

/* Terms Modal Specifics */
.terms-modal-card {
  max-width: 520px;
}

.terms-body {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.5rem;
  overflow-y: auto;
  max-height: 65vh;
}

.terms-block h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.terms-block p {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.terms-block strong {
  color: var(--text-primary);
}

.terms-block em {
  font-style: italic;
}

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

/* ==========================================================================
   SETTINGS MODAL
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--modal-backdrop);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  transform: translateY(12px) scale(0.98);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.modal-overlay.open .modal-card {
  transform: translateY(0) scale(1);
}

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

.modal-header h2 {
  font-size: 1.2rem;
  font-weight: 700;
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.settings-group h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.9rem;
}

.time-inputs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.input-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.input-field label, .select-field label, .slider-field label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.input-field input, .input-field-inline input, .select-field select {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.55rem 0.75rem;
  outline: none;
}

.input-field input:focus, .input-field-inline input:focus, .select-field select:focus {
  border-color: var(--accent);
}

.input-field-inline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.75rem;
}

.input-field-inline label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.input-field-inline input {
  width: 70px;
  text-align: center;
}

/* Switch Row */
.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0;
  cursor: pointer;
}

.switch-label {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.switch-label strong {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.switch-label small {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Toggle Switch Styles */
.toggle-switch {
  appearance: none;
  -webkit-appearance: none;
  width: 44px;
  height: 24px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  position: relative;
  cursor: pointer;
  outline: none;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.toggle-switch::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: #ffffff;
  border-radius: 50%;
  transition: transform var(--transition-fast);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}

.toggle-switch:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.toggle-switch:checked::before {
  transform: translateX(20px);
}

/* Sound and Selectors */
.select-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.sound-select-row {
  display: flex;
  gap: 0.5rem;
}

.sound-select-row select {
  flex: 1;
}

.small-btn {
  height: 38px;
  padding: 0 0.9rem;
  font-size: 0.85rem;
  white-space: nowrap;
}

.slider-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.slider-field input[type="range"] {
  accent-color: var(--accent);
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--bg-input);
  cursor: pointer;
}

.notification-permission-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
  margin-top: 0.75rem;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-card);
}

.modal-footer .primary-btn {
  min-width: auto;
  height: 44px;
  padding: 0 1.4rem;
  font-size: 0.95rem;
}

/* ==========================================================================
   RESPONSIVE ADJUSTMENTS (PC, TABLET, MOBILE)
   ========================================================================== */

/* Mobile (< 480px) */
@media (max-width: 480px) {
  .app-container {
    padding: 1rem 0.85rem 2rem;
  }

  .timer-section {
    padding: 1.5rem 1rem 1.5rem;
  }

  .primary-btn {
    min-width: 130px;
    height: 52px;
    font-size: 1.05rem;
    padding: 0 1.2rem;
  }

  .secondary-btn {
    height: 44px;
    padding: 0 0.85rem;
    font-size: 0.85rem;
  }

  .secondary-btn .btn-text {
    display: none; /* Icon-only on very compact screens */
  }

  .shortcuts-hint {
    display: none; /* Hide keyboard shortcuts on mobile touch screens */
  }

  .add-task-btn span {
    display: none; /* Plus icon only on small screens */
  }

  .add-task-btn {
    padding: 0 0.9rem;
  }
}

/* Tablet (481px to 768px) */
@media (min-width: 481px) and (max-width: 768px) {
  .app-container {
    max-width: 540px;
  }
}

/* Desktop (> 768px) */
@media (min-width: 769px) {
  .app-container {
    max-width: 580px;
  }

  .timer-section:hover {
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.08);
  }
}