/* ------------------------------------------------------------------
   styles.css
   Extracted and organized CSS for Flashcards Study App
   ------------------------------------------------------------------ */

/* CSS Variables for Theme Management */
:root {
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --secondary-color: #8b5cf6;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;

  /* Light Theme */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --border-color: #475569;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: 'Inter', sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
  color: var(--text-primary);
  min-height: 100vh;
  transition: all .3s ease;
}

.footer-separator {
    border: none; /* Remove default border */
    height: 1px; /* Set the height of the line */
    background-color: #ccc; /* Set the color of the line */
    margin-top: 20px; /* Space above the line */
    margin-bottom: 20px; /* Space below the line */
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header Styles */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.main-title {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: .5rem;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Card */
.card {
  background: var(--bg-secondary);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  transition: all .3s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Filters */
.filters-toggle {
  display: flex;
  align-items: center;
  gap: .5rem;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1rem;
  cursor: pointer;
  padding: .5rem;
  border-radius: .5rem;
  transition: all .2s ease;
}

.filters-toggle:hover {
  background: var(--bg-tertiary);
}

.filters-content {
  display: none;
  margin-top: 1rem;
  animation: slideDown .3s ease;
}

.filters-content.show {
  display: block;
}

.filters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.filter-label {
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.filter-select {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: .5rem;
  padding: .75rem;
  color: var(--text-primary);
  font-size: .875rem;
  transition: all .2s ease;
}

.filter-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, .1);
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.checkbox {
  width: 1rem;
  height: 1rem;
  accent-color: var(--primary-color);
}

/* Progress */
.progress-section {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.progress-label {
  font-size: .875rem;
  font-weight: 500;
}

.progress-badge {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: .25rem .75rem;
  border-radius: 9999px;
  font-size: .875rem;
  font-weight: 500;
}

.progress-bar {
  width: 100%;
  height: .75rem;
  background: var(--bg-tertiary);
  border-radius: 9999px;
  overflow: hidden;
  margin-bottom: .75rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  border-radius: 9999px;
  transition: width .5s ease;
}

.progress-stats {
  text-align: center;
  font-size: .875rem;
  color: var(--text-secondary);
}

/* Flashcard */
.flashcard {
  min-height: 400px;
  display: flex;
  flex-direction: column;
}

.flashcard-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.badges {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}

.badge {
  padding: .25rem .75rem;
  border-radius: 9999px;
  font-size: .75rem;
  font-weight: 500;
}

.badge-category {
  background: rgba(59, 130, 246, .1);
  color: var(--primary-color);
  border: 1px solid rgba(59, 130, 246, .2);
}

.badge-subcategory {
  background: rgba(139, 92, 246, .1);
  color: var(--secondary-color);
  border: 1px solid rgba(139, 92, 246, .2);
}

.badge-asterisk {
  background: rgba(245, 158, 11, .1);
  color: var(--warning-color);
  border: 1px solid rgba(245, 158, 11, .2);
}

.bookmark-btn {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  padding: .5rem;
  border-radius: .5rem;
  transition: all .2s ease;
  color: var(--text-secondary);
}

.bookmark-btn:hover {
  background: var(--bg-tertiary);
}

.bookmark-btn.active {
  color: var(--warning-color);
}

.flashcard-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
}

.question-section {
  background: linear-gradient(135deg, rgba(16, 185, 129, .05) 0%, rgba(59, 130, 246, .05) 100%);
  border: 1px solid rgba(16, 185, 129, .2);
  border-left: 4px solid var(--success-color);
  border-radius: .75rem;
  padding: 1.5rem;
  margin-top: 1rem;
}

.question-number {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.question-text {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.4;
  text-align: left;
  margin-left: 3rem;
}

.answer-section {
  display: none;
  background: linear-gradient(135deg, rgba(16, 185, 129, .05) 0%, rgba(59, 130, 246, .05) 100%);
  border: 1px solid rgba(16, 185, 129, .2);
  border-left: 4px solid var(--success-color);
  border-radius: .75rem;
  padding: 1.5rem;
  margin-top: 1rem;
}

.answer-section.show {
  display: block;
  opacity: 1;
}

.answer-label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--success-color);
  margin-bottom: .5rem;
  text-align: left;
}

.answer-text {
  font-size: 1.125rem;
  color: var(--text-primary);
  line-height: 1.5;
  text-align: left;
}

/* Buttons */
.btn {
  padding: .75rem 1.5rem;
  border-radius: .5rem;
  border: none;
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

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

.btn-success:hover {
  background: #059669;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background: var(--bg-tertiary);
  transform: translateY(-1px);
}

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

.btn-danger:hover {
  background: #dc2626;
  transform: translateY(-1px);
}

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

.btn-warning:hover {
  background: #d97706;
  transform: translateY(-1px);
}

/* Button groups - responsive grid-based */
.btn-group {
  display: grid;
  gap: 1rem;
  padding: .25rem;
}

.btn-group-flex {
  display: flex;
  gap: 0.5rem;
  padding: .25rem;
  justify-content: center;
}

.btn-group-2 {
  grid-template-columns: repeat(2, 1fr);
}

.btn-group-3 {
  grid-template-columns: repeat(3, 1fr);
}

.btn-group-4 {
  grid-template-columns: repeat(4, 1fr);
}

.btn-group-5 {
  grid-template-columns: repeat(5, 1fr);
}

/* Theme toggle floating button */
.theme-toggle {
  position: fixed;
  top: 2rem;
  right: 2rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--text-primary);
  box-shadow: var(--shadow);
  transition: all .3s ease;
  z-index: 1000;
}

.theme-toggle:hover {
  transform: scale(1.1);
}

.audio-toggle {
  position: sticky;
  top: 2rem;          /* distance from the top when sticky */
  float: right;       /* float to the right within the container */
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 1.5rem;
  height: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--text-primary);
  box-shadow: var(--shadow);
  transition: all .3s ease;
  z-index: 1000;
}

.audio-toggle:hover {
  transform: scale(1.1);
}

/* Loading spinner */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.spinner {
  width: 2rem;
  height: 2rem;
  border: 2px solid var(--border-color);
  border-top: 2px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Error */
.error-state {
  text-align: center;
  padding: 2rem;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--danger-color);
  margin-bottom: 1rem;
}

.error-message {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* Animations */
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

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

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive tweaks */
@media (max-width:480px) {
  .container {
    padding: 1rem;
  }

  .main-title {
    font-size: 2rem;
  }

  .btn-group-2,
  .btn-group-3,
  .btn-group-4,
  .btn-group-5 {
    grid-template-columns: 1fr;
  }

  .filters-grid {
    grid-template-columns: 1fr;
  }

  .question-text {
    font-size: 1.25rem;
  }

  .theme-toggle {
    top: 1rem;
    right: 1rem;
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1rem;
  }

  .filter-select {
    width: 100%;
    /* Make the dropdown take full width of its parent container */
    max-width: 100vw;
    /* Ensure the dropdown stays within the viewport width */
    box-sizing: border-box;
    /* Ensure padding/border are included in the width calculation */
  }

  .shortcut-label {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
  }
}

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

.no-questions {
  text-align: center;
  padding: 3rem 1rem;
}

.no-questions h3 {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.no-questions p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Links styling */
a {
  color: var(--primary-color);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color 0.3s ease;
}

[data-theme="dark"] a {
  color: var(--secondary-color);
  /* or a lighter blue/purple that fits dark mode */
}

a:hover,
a:focus {
  color: var(--primary-hover);
}

/* Dark Theme Improvements */
[data-theme="dark"] .btn-outline {
  color: var(--text-secondary);
  border-color: var(--text-secondary);
}

.toast {
  padding: 10px 20px;
  background-color: var(--secondary-color);
  color: white;
  margin: 10px;
  border-radius: 4px;
  opacity: 1;
  transition: opacity 0.5s ease;
}

.toast.fade-out {
  opacity: 0;
}

#shuffle-unasked-btn.active {
  background-color: #4caf50;
  /* green */
  color: white;
}