/* ============================================
   EnglishPhrasesApp — Style
   Ciemny motyw, responsive, bez frameworków
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #1c2128;
  --bg-input: #21262d;
  --border: #30363d;
  --border-light: #484f58;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --green: #3fb950;
  --green-bg: rgba(63, 185, 80, 0.15);
  --red: #f85149;
  --red-bg: rgba(248, 81, 73, 0.15);
  --yellow: #d29922;
  --yellow-bg: rgba(210, 153, 34, 0.15);
  --purple: #bc8cff;
  --purple-bg: rgba(188, 140, 255, 0.15);
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
  --max-width: 640px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

a:hover {
  color: var(--accent-hover);
}

/* --- Layout --- */
.app-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Navigation --- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.nav-brand {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: 4px;
}

.nav-link {
  padding: 6px 12px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  border: none;
  background: none;
  transition: background var(--transition), color var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-input);
}

/* --- Screens (show/hide) --- */
.screen {
  display: none;
  flex: 1;
}

.screen.active {
  display: flex;
  flex-direction: column;
}

/* --- Auth Screen --- */
.auth-screen {
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 24px 16px;
}

.auth-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow);
}

.auth-title {
  font-size: 1.5rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 8px;
}

.auth-subtitle {
  color: var(--text-secondary);
  text-align: center;
  font-size: 0.875rem;
  margin-bottom: 24px;
}

.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.auth-tab {
  flex: 1;
  padding: 10px;
  text-align: center;
  cursor: pointer;
  border: none;
  background: var(--bg-input);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}

.auth-tab.active {
  background: var(--accent);
  color: #fff;
}

/* --- Forms --- */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}

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

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), opacity var(--transition);
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
}

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

.btn-green {
  background: var(--green);
  color: #fff;
}

.btn-green:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-red {
  background: var(--red);
  color: #fff;
}

.btn-red:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text-primary);
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--border-light);
  background: var(--bg-input);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

/* --- Alerts / Messages --- */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  margin-bottom: 16px;
}

.alert-info {
  background: rgba(88, 166, 255, 0.1);
  border: 1px solid rgba(88, 166, 255, 0.3);
  color: var(--accent);
}

.alert-success {
  background: var(--green-bg);
  border: 1px solid rgba(63, 185, 80, 0.3);
  color: var(--green);
}

.alert-warning {
  background: var(--yellow-bg);
  border: 1px solid rgba(210, 153, 34, 0.3);
  color: var(--yellow);
}

.alert-error {
  background: var(--red-bg);
  border: 1px solid rgba(248, 81, 73, 0.3);
  color: var(--red);
}

.alert-pending {
  background: var(--yellow-bg);
  border: 1px solid rgba(210, 153, 34, 0.3);
  color: var(--yellow);
  text-align: center;
  padding: 24px;
}

.alert-pending h3 {
  margin-bottom: 8px;
}

/* --- Home Screen --- */
.home-header {
  margin-bottom: 24px;
}

.home-greeting {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 4px;
}

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

/* --- Method Info Card --- */
.method-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 24px;
  overflow: hidden;
}

.method-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition);
}

.method-toggle:hover {
  color: var(--text-primary);
}

.method-toggle-icon {
  font-size: 0.75rem;
  transition: transform 0.2s ease;
}

.method-card.open .method-toggle-icon {
  transform: rotate(90deg);
}

.method-toggle-title {
  flex: 1;
  text-align: left;
}

.method-content {
  padding: 0 16px 16px;
}

.method-step {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}

.method-step-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.method-step-text strong {
  display: block;
  font-size: 0.875rem;
  margin-bottom: 4px;
}

.method-step-text p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-value.green { color: var(--green); }
.stat-value.red { color: var(--red); }
.stat-value.yellow { color: var(--yellow); }
.stat-value.accent { color: var(--accent); }

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.streak-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.streak-icon {
  font-size: 2rem;
}

.streak-info {
  flex: 1;
}

.streak-current {
  font-size: 1.25rem;
  font-weight: 600;
}

.streak-best {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.start-btn {
  width: 100%;
  padding: 16px;
  font-size: 1.1rem;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition);
}

.start-btn:hover:not(:disabled) {
  background: var(--accent-hover);
}

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

.start-btn-secondary {
  background: var(--bg-secondary);
  border: 1px solid var(--accent);
  color: var(--accent);
  margin-top: 16px;
}

.start-btn-secondary:hover:not(:disabled) {
  background: var(--bg-input);
}

/* --- Flashcard Screen --- */
.flashcard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.flashcard-counter {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.flashcard-close {
  color: var(--text-secondary);
  cursor: pointer;
  background: none;
  border: none;
  font-size: 1.25rem;
  padding: 4px 8px;
}

.flashcard {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  flex: 1;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.flashcard-verb {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.flashcard-tags {
  display: flex;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tag-business {
  background: rgba(88, 166, 255, 0.15);
  color: var(--accent);
}

.tag-general {
  background: rgba(139, 148, 158, 0.15);
  color: var(--text-secondary);
}

.tag-both {
  background: var(--purple-bg);
  color: var(--purple);
}

.tag-formal {
  background: var(--purple-bg);
  color: var(--purple);
}

.tag-informal {
  background: var(--green-bg);
  color: var(--green);
}

.tag-neutral {
  background: rgba(139, 148, 158, 0.15);
  color: var(--text-secondary);
}

.tag-tense {
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent);
}

.tag-context {
  background: rgba(139, 148, 158, 0.1);
  color: var(--text-secondary);
}

.speak-btn {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 1.2rem;
  margin: 0 auto 24px;
  transition: all var(--transition);
}

.speak-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.flashcard-actions {
  display: flex;
  gap: 12px;
  margin-top: auto;
  padding-top: 24px;
}

.flashcard-actions .btn {
  flex: 1;
  padding: 14px;
  font-size: 1rem;
  font-weight: 600;
}

/* --- Quiz Options --- */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 24px;
  text-align: left;
}

.quiz-option {
  padding: 14px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  text-align: left;
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all 0.2s;
  line-height: 1.4;
}

.quiz-option:hover:not(.disabled) {
  border-color: var(--accent);
}

.quiz-option.correct {
  background: rgba(63, 185, 80, 0.15);
  border-color: var(--green);
  color: var(--green);
}

.quiz-option.incorrect {
  background: rgba(248, 81, 73, 0.15);
  border-color: var(--red);
  color: var(--red);
}

.quiz-option.disabled {
  pointer-events: none;
  opacity: 0.6;
}

.quiz-option.correct,
.quiz-option.incorrect {
  opacity: 1;
}

.quiz-option-label {
  font-weight: 600;
  margin-right: 8px;
}

/* --- Answer Section --- */
.answer-section {
  text-align: left;
  margin-top: 24px;
  animation: slideDown 0.3s ease;
}

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

.answer-definition {
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 16px;
  padding: 16px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
}

.answer-translation {
  margin-bottom: 16px;
}

.translation-toggle {
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.85rem;
  background: none;
  border: none;
  padding: 4px 0;
  transition: color var(--transition);
}

.translation-toggle:hover {
  color: var(--text-secondary);
}

.translation-text {
  display: none;
  padding: 8px 12px;
  background: var(--bg-card);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-style: italic;
  margin-top: 6px;
}

.translation-text.visible {
  display: block;
}

.answer-examples {
  margin-bottom: 16px;
}

.answer-examples h4 {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.example-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 8px;
}

.example-sentence {
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 8px;
}

.example-sentence strong {
  color: var(--accent);
}

.example-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.example-speak {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 2px 4px;
  transition: color var(--transition);
}

.example-speak:hover {
  color: var(--accent);
}

.next-btn {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
  font-weight: 600;
  margin-top: 12px;
}

/* --- Session Summary --- */
.summary-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
}

.summary-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.summary-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.summary-stat {
  padding: 16px;
  border-radius: var(--radius);
  background: var(--bg-card);
}

.summary-mistakes {
  text-align: left;
  margin-bottom: 24px;
}

.summary-mistakes h4 {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.mistake-item {
  padding: 8px 12px;
  background: var(--red-bg);
  border-radius: var(--radius);
  margin-bottom: 4px;
  font-size: 0.9rem;
  color: var(--red);
}

/* --- Admin Panel --- */
.admin-section {
  margin-bottom: 24px;
}

.admin-section h3 {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.user-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 8px;
}

.user-info {
  flex: 1;
}

.user-email {
  font-size: 0.9rem;
  font-weight: 500;
}

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

.user-actions {
  display: flex;
  gap: 6px;
}

/* --- Settings --- */
.settings-group {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.settings-group h3 {
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
}

.setting-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.setting-value {
  font-weight: 600;
  min-width: 30px;
  text-align: center;
}

input[type="range"] {
  -webkit-appearance: none;
  background: var(--bg-input);
  height: 6px;
  border-radius: 3px;
  outline: none;
  width: 120px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
}

/* --- Checkbox custom --- */
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.825rem;
  transition: all var(--transition);
}

.checkbox-label:has(input:checked) {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.1);
}

.checkbox-label input {
  accent-color: var(--accent);
}

/* --- Progress bars (dashboard) --- */
.progress-bar-container {
  margin-top: 8px;
}

.progress-bar {
  width: 100%;
  height: 12px;
  background: var(--bg-input);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
}

.progress-segment {
  height: 100%;
  transition: width 0.3s ease;
}

.green-bg { background: var(--green); }
.yellow-bg { background: var(--yellow); }
.accent-bg { background: var(--accent); }
.purple-bg { background: var(--purple); }
.muted-bg { background: var(--text-muted); }

.progress-legend {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.legend-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}

/* --- Loading / Spinner --- */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

.loading-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  padding: 24px;
}

/* --- Utilities --- */
.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.hidden { display: none !important; }

/* --- Responsive --- */
@media (max-width: 480px) {
  .auth-card {
    padding: 24px 16px;
  }

  .flashcard {
    padding: 24px 16px;
  }

  .flashcard-verb {
    font-size: 1.5rem;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .stat-card {
    padding: 12px;
  }

  .stat-value {
    font-size: 1.4rem;
  }

  .nav-link {
    padding: 6px 8px;
    font-size: 0.8rem;
  }
}