/* ==========================================================================
   Unstuck - Calming, accessible styling
   ========================================================================== */

/* CSS Custom Properties */
:root {
  /* Light theme (default) */
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f5f5;
  --text-primary: #2d3748;
  --text-secondary: #718096;
  --text-muted: #a0aec0;
  --accent: #4a7c6f;
  --accent-hover: #3d6b5f;
  --accent-light: #e8f0ee;
  --border: #e2e8f0;
  --border-focus: #4a7c6f;
  --success: #68a67d;
  --error: #c53030;
  --error-bg: #fff5f5;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --line-height: 1.6;
}

/* Dark theme */
[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16162a;
  --bg-tertiary: #232340;
  --text-primary: #e2e8f0;
  --text-secondary: #a0aec0;
  --text-muted: #718096;
  --accent: #68a67d;
  --accent-hover: #7ab88d;
  --accent-light: #2a3a30;
  --border: #2d3748;
  --border-focus: #68a67d;
  --error-bg: #2d1f1f;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.2);
}

/* Auto dark mode based on system preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16162a;
    --bg-tertiary: #232340;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --accent: #68a67d;
    --accent-hover: #7ab88d;
    --accent-light: #2a3a30;
    --border: #2d3748;
    --border-focus: #68a67d;
    --error-bg: #2d1f1f;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.2);
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
}

/* Screen reader only */
.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;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 600px;
  margin: 0 auto;
  padding: var(--space-lg);
}

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

.logo {
  font-size: var(--font-size-xl);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-primary);
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   Theme Toggle
   ========================================================================== */

#theme-toggle {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

#theme-toggle:hover {
  background-color: var(--bg-tertiary);
}

.theme-icon-dark {
  display: none;
}

[data-theme="dark"] .theme-icon-light {
  display: none;
}

[data-theme="dark"] .theme-icon-dark {
  display: inline;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-icon-light {
    display: none;
  }
  :root:not([data-theme="light"]) .theme-icon-dark {
    display: inline;
  }
}

/* ==========================================================================
   Screens
   ========================================================================== */

.screen {
  display: none;
  flex-direction: column;
  animation: fadeIn var(--transition-normal);
}

.screen.active,
.screen:not([hidden]) {
  display: flex;
}

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

/* ==========================================================================
   Screen: Input
   ========================================================================== */

.tagline {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  font-size: var(--font-size-lg);
}

.task-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.task-input {
  width: 100%;
  padding: var(--space-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  resize: vertical;
  min-height: 120px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.task-input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.input-hint {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-align: center;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  min-height: 44px;
  min-width: 44px;
  transition: all var(--transition-fast);
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-light);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-tertiary);
  border-color: var(--text-muted);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-link {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  text-decoration: underline;
  cursor: pointer;
  padding: var(--space-sm);
  margin-top: var(--space-lg);
}

.btn-link:hover {
  color: var(--text-secondary);
}

.icon-btn {
  background: none;
  border: none;
  padding: var(--space-sm);
  font-size: var(--font-size-lg);
  cursor: pointer;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

/* ==========================================================================
   Error Message
   ========================================================================== */

.error-message {
  background-color: var(--error-bg);
  color: var(--error);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-top: var(--space-md);
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

/* ==========================================================================
   Settings Panel
   ========================================================================== */

.settings-panel {
  margin-top: var(--space-2xl);
  border-top: 1px dashed var(--border);
  padding-top: var(--space-lg);
}

.settings-toggle {
  cursor: pointer;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.settings-toggle::-webkit-details-marker {
  display: none;
}

.settings-toggle::before {
  content: '\2699\fe0e';
  font-size: 1.1em;
}

.settings-content {
  margin-top: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.setting-label {
  font-weight: 500;
  color: var(--text-primary);
}

.setting-hint {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.setting-hint a {
  color: var(--accent);
  text-decoration: none;
}

.setting-hint a:hover {
  text-decoration: underline;
}

.setting-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-sm) 0;
}

.api-key-wrapper {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.api-key-input {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}

.api-key-input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.timer-duration-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.timer-duration-select {
  padding: var(--space-sm) var(--space-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.timer-duration-select:focus {
  outline: none;
  border-color: var(--border-focus);
}

.setting-checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.setting-checkbox-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ==========================================================================
   Screen: Loading
   ========================================================================== */

.screen-loading {
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

.loading-text {
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-lg);
}

.spinner {
  display: flex;
  gap: var(--space-sm);
}

.spinner span {
  width: 12px;
  height: 12px;
  background-color: var(--accent);
  border-radius: var(--radius-full);
  animation: bounce 1.4s ease-in-out infinite both;
}

.spinner span:nth-child(1) {
  animation-delay: -0.32s;
}

.spinner span:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes bounce {
  0%, 80%, 100% {
    transform: scale(0);
  }
  40% {
    transform: scale(1);
  }
}

/* ==========================================================================
   Screen: Step View
   ========================================================================== */

.step-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: var(--space-sm);
}

.step-indicator {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.step-progress-bar {
  height: 4px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-xl);
}

.progress-fill {
  height: 100%;
  background-color: var(--accent);
  transition: width var(--transition-normal);
}

.step-main {
  background-color: var(--bg-secondary);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-xl);
}

.step-label {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-align: center;
  margin-bottom: var(--space-md);
}

.step-content {
  font-size: var(--font-size-xl);
  line-height: 1.8;
  text-align: center;
  color: var(--text-primary);
}

/* ==========================================================================
   Timer
   ========================================================================== */

.timer-section {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.timer-display {
  font-size: 3rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.timer-display.running {
  color: var(--accent);
}

.timer-display.finished {
  color: var(--success);
}

.timer-controls {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
}

/* ==========================================================================
   Step Actions
   ========================================================================== */

.step-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.section-divider {
  border: none;
  border-top: 1px dashed var(--border);
  margin: var(--space-md) 0;
}

.secondary-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
}

#start-over,
#start-over-all {
  align-self: center;
}

/* ==========================================================================
   Screen: All Steps
   ========================================================================== */

.all-steps-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.task-summary {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  text-align: center;
}

.steps-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.step-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 2px solid var(--border);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.step-item:hover {
  border-color: var(--text-muted);
}

.step-item.completed {
  background-color: var(--accent-light);
  border-color: var(--accent);
}

.step-item.current {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.step-checkbox {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: transparent;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

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

.step-text {
  flex: 1;
  line-height: 1.5;
}

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

.encouragement {
  text-align: center;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: var(--space-lg);
}

/* ==========================================================================
   Modal
   ========================================================================== */

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.modal[hidden] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  position: relative;
  background-color: var(--bg-secondary);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.modal-text {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.modal-steps {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
}

.modal-steps li {
  margin-bottom: var(--space-sm);
}

.modal-steps a {
  color: var(--accent);
}

.modal-input-group {
  margin-bottom: var(--space-md);
}

.modal-input-group .api-key-input {
  width: 100%;
}

.modal-privacy {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-md);
}

/* Export modal specific */
.export-preview {
  background-color: var(--bg-tertiary);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  max-height: 300px;
  overflow-y: auto;
}

.export-preview pre {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  font-size: var(--font-size-sm);
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-primary);
}

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

.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  background-color: var(--text-primary);
  color: var(--bg-primary);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-sm);
  animation: toastIn var(--transition-normal) ease-out;
}

.toast.toast-out {
  animation: toastOut var(--transition-normal) ease-in forwards;
}

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

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

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

@media (max-width: 480px) {
  .app-container {
    padding: var(--space-md);
  }

  .step-main {
    padding: var(--space-lg);
  }

  .step-content {
    font-size: var(--font-size-lg);
  }

  .timer-display {
    font-size: 2.5rem;
  }

  .step-actions {
    flex-wrap: wrap;
  }

  .modal-content {
    padding: var(--space-lg);
  }

  .modal-actions {
    flex-direction: column;
  }

  .modal-actions .btn {
    width: 100%;
  }
}