/* ===================================
   vRecall - Vocabulary Learning PWA
   Minimal Modern Design
   =================================== */

/* CSS Variables */
:root {
  /* Colors - Dark Theme */
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-tertiary: #1a1a1a;
  --bg-card: #1e1e1e;
  --bg-hover: #252525;

  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;

  --accent-primary: #4A90E2;
  --accent-light: #64B5F6;
  --accent-dark: #357ABD;

  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;

  --border-color: #2a2a2a;
  --border-radius: 12px;
  --border-radius-sm: 8px;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Safe areas for PWA */
  --safe-area-top: env(safe-area-inset-top, 0px);
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #f5f5f5;
  --bg-secondary: #ffffff;
  --bg-tertiary: #fafafa;
  --bg-card: #ffffff;
  --bg-hover: #f0f0f0;

  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-muted: #999999;

  --border-color: #e0e0e0;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* App Container */
.app-container {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: var(--safe-area-top);
  padding-bottom: var(--safe-area-bottom);
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

.app-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--accent-primary);
  letter-spacing: -0.5px;
}

/* Buttons */
.btn-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--border-radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--accent-dark);
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.btn-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

/* Main Content */
.app-main {
  flex: 1;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

/* Notification Test Section */
.notification-test-section {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
}

.notification-status {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.status-icon {
  font-size: 32px;
  line-height: 1;
}

.status-text h3 {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.status-text p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.4;
}

.notification-status.supported .status-icon::after {
  content: '✅';
}

.notification-status.unsupported .status-icon::after {
  content: '❌';
}

.notification-status.denied .status-icon::after {
  content: '🚫';
}

.notification-status.granted .status-icon::after {
  content: '✅';
}

/* Input Section */
.input-section {
  width: 100%;
}

.input-wrapper {
  display: flex;
  gap: var(--spacing-md);
}

.word-input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  font-size: var(--font-size-md);
  outline: none;
  transition: all var(--transition-fast);
}

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

.word-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.15);
}

/* Preview Section */
.preview-section {
  animation: slideUp 0.3s ease;
}

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

.preview-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
}

.preview-header {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.preview-word {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.preview-pos {
  font-size: var(--font-size-sm);
  color: var(--accent-primary);
  font-style: italic;
}

.preview-definition {
  color: var(--text-secondary);
  font-size: var(--font-size-md);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.preview-example {
  background-color: var(--bg-tertiary);
  border-left: 3px solid var(--accent-primary);
  padding: var(--spacing-md);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin-bottom: var(--spacing-lg);
}

.example-label {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-xs);
}

.example-text {
  color: var(--text-secondary);
  font-style: italic;
}

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

/* Loading Section */
.loading-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xl);
}

.loader {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-section p {
  color: var(--text-secondary);
}

/* Error Section */
.error-section {
  animation: slideUp 0.3s ease;
}

.error-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  text-align: center;
}

.error-card svg {
  margin-bottom: var(--spacing-md);
}

.error-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.error-card p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

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

/* Vocabulary Section */
.vocabulary-section {
  flex: 1;
}

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

.section-header h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.filter-tabs {
  display: flex;
  gap: var(--spacing-xs);
  background-color: var(--bg-secondary);
  padding: var(--spacing-xs);
  border-radius: var(--border-radius-sm);
}

.filter-tab {
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.filter-tab.active {
  background-color: var(--accent-primary);
  color: white;
}

/* Vocabulary List */
.vocabulary-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.vocabulary-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.vocabulary-item:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent-primary);
}

.vocabulary-item-content {
  flex: 1;
  min-width: 0;
}

.vocabulary-item-word {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.vocabulary-item-definition {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.vocabulary-item-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--spacing-xs);
}

.vocabulary-item-status {
  font-size: var(--font-size-xs);
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
}

.vocabulary-item-status.active {
  background-color: rgba(74, 144, 226, 0.15);
  color: var(--accent-primary);
}

.vocabulary-item-status.mastered {
  background-color: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.vocabulary-item-next-review {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  text-align: center;
}

.empty-state svg {
  opacity: 0.5;
  margin-bottom: var(--spacing-md);
}

.empty-state h3 {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 200;
  padding: var(--spacing-md);
  animation: fadeIn 0.2s ease;
}

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

.modal-content {
  background-color: var(--bg-card);
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  overflow-y: auto;
  padding: var(--spacing-lg);
  animation: slideUpModal 0.3s ease;
}

.modal-large {
  max-height: 90vh;
}

@keyframes slideUpModal {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

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

.modal-header h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
}

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

/* Form Elements */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-md);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  font-size: var(--font-size-md);
  font-family: inherit;
  outline: none;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--accent-primary);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-lg);
}

/* Word Detail Modal */
.detail-content {
  margin-bottom: var(--spacing-lg);
}

.detail-meta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.detail-pos {
  font-size: var(--font-size-sm);
  color: var(--accent-primary);
  font-style: italic;
}

.detail-status {
  font-size: var(--font-size-xs);
  padding: 2px 10px;
  border-radius: 10px;
  font-weight: 500;
}

.detail-status.active {
  background-color: rgba(74, 144, 226, 0.15);
  color: var(--accent-primary);
}

.detail-status.mastered {
  background-color: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.detail-definition {
  font-size: var(--font-size-md);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.detail-examples {
  margin-bottom: var(--spacing-lg);
}

.detail-example-item {
  background-color: var(--bg-tertiary);
  border-left: 3px solid var(--accent-primary);
  padding: var(--spacing-md);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin-bottom: var(--spacing-sm);
  font-style: italic;
  color: var(--text-secondary);
}

.detail-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background-color: var(--bg-tertiary);
  border-radius: var(--border-radius-sm);
}

.stat-item {
  text-align: center;
}

.stat-label {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.stat-value {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--text-primary);
}

.detail-actions {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.detail-actions button {
  flex: 1;
  min-width: 100px;
}

/* Settings */
.settings-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-color);
}

.setting-item:last-child {
  border-bottom: none;
}

.setting-info {
  flex: 1;
}

.setting-label {
  display: block;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.setting-desc {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Toggle Switch */
.toggle {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--bg-tertiary);
  border-radius: 28px;
  transition: var(--transition-normal);
}

.toggle-slider::before {
  position: absolute;
  content: "";
  height: 22px;
  width: 22px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-secondary);
  border-radius: 50%;
  transition: var(--transition-normal);
}

.toggle input:checked + .toggle-slider {
  background-color: var(--accent-primary);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(22px);
  background-color: white;
}

.time-range {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.time-input {
  width: 100px;
  text-align: center;
}

.settings-footer {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.app-info {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Toast */
.toast {
  position: fixed;
  bottom: calc(var(--spacing-xl) + var(--safe-area-bottom));
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--bg-card);
  color: var(--text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  z-index: 300;
  animation: toastIn 0.3s ease;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

.toast.toast-out {
  animation: toastOut 0.3s ease forwards;
}

@keyframes toastOut {
  from {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  to {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
  }
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Responsive */
@media (min-width: 481px) {
  .modal-content {
    border-radius: var(--border-radius);
    margin: auto;
  }

  .modal {
    align-items: center;
  }
}

/* iOS Safe Areas */
@supports (padding: max(0px)) {
  .app-header {
    padding-top: max(var(--spacing-md), var(--safe-area-top));
  }

  .toast {
    bottom: max(var(--spacing-xl), calc(var(--spacing-xl) + var(--safe-area-bottom)));
  }
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

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