/* ===============================================
   Adíghe Echo - Modern Responsive Design
   =============================================== */

:root {
  /* Colors */
  --primary: #0f766e;
  --primary-light: #14b8a6;
  --primary-lighter: #f0fdfa;
  --primary-dark: #0d5850;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  
  /* Neutral */
  --bg: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --text: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --border: #e5e7eb;
  --border-dark: #d1d5db;
  
  /* Spacing */
  --sp-xs: 0.25rem;
  --sp-sm: 0.5rem;
  --sp-md: 1rem;
  --sp-lg: 1.5rem;
  --sp-xl: 2rem;
  --sp-2xl: 3rem;
  
  /* Typography */
  --font-base: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Noto Sans', sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
html.dark {
  --bg: #111827;
  --bg-secondary: #1f2937;
  --bg-tertiary: #374151;
  --text: #f9fafb;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;
  --border: #374151;
  --border-dark: #4b5563;
  --primary-lighter: #134e4a;
}

/* ===============================================
   Reset & Base Styles
   =============================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  background: var(--bg);
  color: var(--text);
  transition: background-color 0.3s, color 0.3s;
  font-size: var(--text-base);
  line-height: 1.6;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea {
  font-family: inherit;
}

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

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg);
}

.app-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: var(--sp-lg) var(--sp-xl);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-lg);
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.header-logo {
  height: 50px;
  width: auto;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  padding: var(--sp-sm);
}

.header-text {
  flex: 1;
}

.app-name {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--sp-xs);
}

.app-tagline {
  font-size: var(--text-sm);
  opacity: 0.9;
  margin: 0;
}

.theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.15);
  color: white;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.25);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.15);
  color: white;
  font-size: 1.5rem;
  border: none;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  margin-right: var(--sp-md);
}

.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.25);
}

.menu-icon {
  display: block;
  line-height: 1;
}

.menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 99;
  animation: fadeIn 0.2s ease-out;
}

/* ===============================================
   Main Content
   =============================================== */

.app-main {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--sp-xl);
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: var(--sp-xl);
}

/* Lesson Panel */
.lesson-panel {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--sp-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  height: fit-content;
  max-height: 600px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-lg);
  padding-bottom: var(--sp-lg);
  border-bottom: 2px solid var(--border);
}

.panel-header h2 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin: 0;
}

.lesson-counter {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  background: var(--bg-tertiary);
  padding: var(--sp-sm) var(--sp-md);
  border-radius: var(--radius-md);
}

.search-box {
  margin-bottom: var(--sp-lg);
}

.search-input {
  width: 100%;
  padding: var(--sp-md);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  font-size: var(--text-sm);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.1);
}

.lesson-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
  padding-right: var(--sp-sm);
}

.lesson-item {
  padding: var(--sp-md);
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-md);
}

.lesson-item:hover {
  border-color: var(--primary);
  background: var(--primary-lighter);
}

.lesson-item.active {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  border-color: var(--primary);
}

.lesson-item div:first-child strong {
  display: block;
  font-weight: 600;
  margin-bottom: var(--sp-xs);
}

.lesson-item div:first-child small {
  font-size: var(--text-sm);
  opacity: 0.7;
}

.lesson-item div:last-child {
  font-size: var(--text-sm);
  opacity: 0.6;
  white-space: nowrap;
}

/* Practice Area */
.practice-area {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--sp-2xl);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2xl);
}

.progress-container {
  display: flex;
  align-items: center;
  gap: var(--sp-lg);
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
  transition: width 0.3s ease;
}

.progress-text {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 60px;
  text-align: right;
}

/* Lesson Display */
.lesson-display {
  display: flex;
  flex-direction: column;
  gap: var(--sp-lg);
}

.display-content {
  background: linear-gradient(135deg, var(--primary-lighter) 0%, rgba(240, 253, 250, 0.5) 100%);
  border-radius: var(--radius-xl);
  padding: var(--sp-2xl);
  border: 2px solid rgba(15, 118, 110, 0.2);
  text-align: center;
  position: relative;
}

html.dark .display-content {
  background: linear-gradient(135deg, var(--primary-dark) 0%, rgba(13, 88, 80, 0.3) 100%);
}

.lesson-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--sp-md);
}

.target-text {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--primary-dark);
  line-height: 1.3;
  margin-bottom: var(--sp-lg);
  word-break: break-word;
}

html.dark .target-text {
  color: var(--primary-light);
}

/* Inline play button that appears next to the target text */

.target-wrapper{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:0.75rem;
  position: relative;
}

/* Content row layout - for consistent spacing and alignment */
.content-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-lg);
  position: relative;
  min-height: 50px;
  margin-bottom: var(--sp-lg);
}

.content-row:last-child {
  margin-bottom: 0;
}

.translation-row {
  padding-top: var(--sp-lg);
  border-top: 2px solid rgba(15, 118, 110, 0.1);
}

/* Translate controls: language buttons + reveal button centered below translation */
.translate-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-btn {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  font-size: 16px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.lang-btn[aria-pressed="true"] {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.lang-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }

/* Reveal button aligned with lang buttons */
.reveal-translation-toggle {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  display: inline-grid;
  place-items: center;
  cursor: pointer;
}

/* Small tooltip using data-tooltip attribute */
[data-tooltip] { position: relative; }
[data-tooltip]:after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.8);
  color: white;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
  z-index: 30;
}

[data-tooltip]:hover:after { opacity: 1; }

/* Main inline play button - right aligned in content row */
.inline-play{
  position: relative;
  display:inline-grid;
  place-items:center;
  width:40px;
  height:40px;
  border-radius:8px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  color: white;
  font-size:1rem;
  transition:var(--transition);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  z-index: 6;
  flex-shrink: 0;
}

.inline-play:hover{
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.inline-play:active{
  transform: translateY(0);
}

.play-icon-svg{
  width:20px;
  height:20px;
  display:block;
}

/* Small play button next to translation */
.translation-inline{display:flex;align-items:center;gap:0.5rem;justify-content:center}

/* Reveal translation toggle - right aligned in content row */
.reveal-translation-toggle{
  position: relative;
  width:40px;
  height:40px;
  border-radius:6px;
  border:1px solid var(--border);
  background:var(--bg);
  color:var(--primary);
  display:inline-grid;
  place-items:center;
  font-size:1.2rem;
  transition:var(--transition);
  cursor:pointer;
  z-index:5;
  flex-shrink: 0;
}
.reveal-translation-toggle[aria-pressed="true"]{background:var(--primary);color:white;border-color:var(--primary)}
.reveal-translation-toggle:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}

/* Animation for reveal/hide translation */
@keyframes fadeSlide {
  0% { opacity: 0; transform: translateY(-4px); }
  100% { opacity: 1; transform: translateY(0); }
}

.translation.show-animated{
  animation: fadeSlide 0.3s ease-out;
}

/* Language switch animation */
.switch-anim {
  animation: switchFade 0.28s ease-out;
}

@keyframes switchFade {
  0% { opacity: 0; transform: translateY(-6px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* Arabic/RLT adjustments for translation text */
.translation[dir="rtl"] {
  direction: rtl;
  text-align: right;
  /* prefer an Arabic font if available */
  font-family: 'Noto Naskh Arabic', 'Noto Sans', serif;
}

/* Hide the old large play control if present */
.audio-controls{display:none !important}

.translation-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-md);
}

.translation {
  font-size: var(--text-lg);
  color: var(--primary);
  opacity: 0.9;
  transition: opacity 0.3s;
}

/* Make hidden translation much less visible */
.translation[aria-hidden="true"] {
  opacity: 0.18;
}

.reveal-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background: rgba(15, 118, 110, 0.1);
  color: var(--primary);
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.reveal-btn:hover {
  background: rgba(15, 118, 110, 0.2);
}

/* Audio Controls */
.audio-controls {
  display: flex;
  justify-content: center;
  gap: var(--sp-lg);
}

.btn-play {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-lg) var(--sp-2xl);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  font-size: var(--text-lg);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

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

.btn-play:active {
  transform: translateY(0);
}

.play-icon {
  font-size: 1.5rem;
}

/* Waveform */
.waveform-canvas {
  width: 100%;
  height: 80px;
  background: var(--bg);
  border-radius: var(--radius-lg);
  border: 2px solid var(--border);
  display: block;
}

/* Recording Section */
/* Compact recording section: small inline controls to save space */
.recording-section {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-md);
  background: transparent;
  border-radius: var(--radius-md);
  border: none;
}

.recording-buttons {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}

.btn-record {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  min-width: 72px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  font-size: 0.95rem;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.btn-record:hover:not(.recording) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-record.recording {
  background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7);
  }
  50% {
    box-shadow: 0 0 0 15px rgba(239, 68, 68, 0);
  }
}


.record-icon {
  font-size: 1.2rem;
  line-height: 1;
}

.btn-text {
  display: inline-block;
  font-size: 0.95rem;
}

.recording-status {
  font-size: 0.85rem;
  color: var(--text-secondary);
  min-height: 18px;
}

/* Navigation */
.navigation-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-lg);
}

.btn-nav {
  padding: var(--sp-lg) var(--sp-xl);
  background: var(--bg);
  color: var(--primary);
  font-size: var(--text-base);
  font-weight: 600;
  border: 2px solid var(--primary);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.btn-nav:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-prev, .btn-next {
  min-width: 120px;
}

/* Feedback Section */

/* Compact feedback: inline summary with small card */
.feedback-section {
  background: transparent;
  border-radius: var(--radius-md);
  padding: var(--sp-sm);
  border: none;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--sp-md);
}

html.dark .feedback-section {
  background: transparent;
}

.feedback-title {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: 0;
}

.feedback-title h3 {
  margin: 0;
  font-size: var(--text-base);
  color: var(--text-secondary);
  font-weight: 700;
}

.score-badge {
  padding: 0.25rem 0.5rem;
  background: var(--bg);
  color: var(--primary);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 8px;
  border: 2px solid var(--primary);
  min-width: 56px;
  text-align: center;
}

html.dark .score-badge {
  background: var(--bg-secondary);
  color: var(--primary-light);
  border-color: var(--primary-light);
}

.comparison-grid {
  display: flex;
  gap: var(--sp-sm);
  align-items: center;
}

.comparison-card {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  border-left: 3px solid var(--primary);
}

html.dark .comparison-card {
  background: var(--bg-secondary);
}

.comparison-card.heard {
  border-left-color: var(--accent);
}

.card-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-bottom: 0.25rem;
}

.card-text {
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.3;
  word-break: break-word;
  font-family: var(--font-display);
  font-weight: 600;
}

.comparison-card.target .card-text {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--primary-dark);
}

html.dark .comparison-card.target .card-text {
  color: var(--primary-light);
}

.feedback-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-lg);
}

.btn-secondary {
  padding: var(--sp-lg);
  background: white;
  color: var(--primary);
  font-size: var(--text-base);
  font-weight: 600;
  border: 2px solid var(--primary);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  cursor: pointer;
}

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

/* Footer */
.app-footer {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: var(--sp-xl);
  text-align: center;
  font-size: var(--text-sm);
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.footer-content p {
  margin: var(--sp-sm) 0;
}

.footer-content a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.footer-content a:hover {
  text-decoration: underline;
}

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

@media (max-width: 1024px) {
  .app-main {
    grid-template-columns: 1fr;
    gap: var(--sp-lg);
    padding: var(--sp-lg);
  }

  .lesson-panel {
    max-height: none;
    height: auto;
  }

  .lesson-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--sp-md);
    flex-direction: row;
  }

  .lesson-item {
    flex-direction: column;
    justify-content: flex-start;
  }

  .practice-area {
    padding: var(--sp-lg);
    gap: var(--sp-lg);
  }
}

@media (max-width: 768px) {
  .app-header {
    padding: var(--sp-md) var(--sp-lg);
  }

  .header-content {
    gap: var(--sp-md);
  }

  .header-logo {
    height: 40px;
  }

  .app-name {
    font-size: var(--text-xl);
  }

  .app-tagline {
    display: none;
  }

  .app-main {
    padding: var(--sp-md);
    gap: var(--sp-md);
  }

  .lesson-panel {
    padding: var(--sp-md);
    max-height: 300px;
  }

  .panel-header {
    margin-bottom: var(--sp-md);
    padding-bottom: var(--sp-md);
  }

  .panel-header h2 {
    font-size: var(--text-base);
  }

  .lesson-counter {
    font-size: 0.75rem;
    padding: var(--sp-sm) var(--sp-md);
  }

  .lesson-list {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-sm);
  }

  .practice-area {
    padding: var(--sp-lg);
    gap: var(--sp-lg);
  }

  .display-content {
    padding: var(--sp-xl);
  }

  .target-text {
    font-size: var(--text-2xl);
  }

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

  .comparison-card {
    padding: var(--sp-md);
  }

  .card-text {
    font-size: var(--text-base);
  }

  .comparison-card.target .card-text {
    font-size: var(--text-lg);
  }

  .btn-record {
    min-width: 72px;
    height: 40px;
    font-size: 0.95rem;
  }

  .record-icon {
    font-size: 1.5rem;
  }

  .feedback-actions {
    grid-template-columns: 1fr;
  }

  .navigation-buttons {
    grid-template-columns: 1fr 1fr;
  }

  .btn-nav {
    padding: var(--sp-md) var(--sp-lg);
  }
}

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

  .header-content {
    flex-wrap: nowrap;
    gap: var(--sp-sm);
    align-items: center;
  }

  .menu-toggle {
    display: flex;
    order: -1;
  }

  .app-name {
    font-size: var(--text-lg);
  }

  .header-logo {
    height: 36px;
  }

  .theme-toggle {
    width: 40px;
    height: 40px;
    font-size: 1rem;
    margin: 0;
  }

  .app-main {
    display: flex;
    flex-direction: column;
    padding: var(--sp-md);
    gap: 0;
    grid-template-columns: none;
  }

  .lesson-panel {
    position: fixed;
    left: 0;
    top: 0;
    width: 260px;
    height: 100vh;
    max-height: 100vh;
    z-index: 101;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 0;
    padding-top: 70px;
    overflow-y: auto;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.2);
  }

  .lesson-panel.menu-open {
    transform: translateX(0);
  }

  .lesson-list {
    grid-template-columns: 1fr;
    gap: var(--sp-sm);
  }

  .menu-overlay {
    display: none;
    pointer-events: none;
  }

  .menu-overlay:not([hidden]) {
    display: block;
    pointer-events: auto;
  }

  .practice-area {
    padding: var(--sp-md);
    gap: var(--sp-md);
    width: 100%;
  }

  .lesson-label {
    font-size: 0.75rem;
  }

  .target-text {
    font-size: var(--text-xl);
    margin-bottom: var(--sp-md);
  }

  .translation-hint {
    flex-direction: row;
    justify-content: center;
  }

  .content-row {
    flex-direction: row;
    gap: var(--sp-md);
  }

  .display-content {
    padding: var(--sp-lg);
  }

  .audio-controls {
    flex-wrap: wrap;
  }

  .btn-play {
    width: 100%;
    padding: var(--sp-lg);
  }

  .waveform-canvas {
    height: 60px;
  }

  .recording-section {
    padding: var(--sp-sm);
  }

  .btn-record {
    min-width: 64px;
    height: 36px;
    font-size: 0.9rem;
  }

  .record-icon {
    font-size: 1.25rem;
  }

  .feedback-section {
    padding: var(--sp-sm);
  }
  
  .feedback-title {
    flex-direction: row;
    align-items: center;
    gap: var(--sp-sm);
  }

  .score-badge {
    align-self: center;
  }

  .comparison-card {
    padding: var(--sp-md);
  }

  .card-text {
    font-size: var(--text-base);
  }

  .comparison-card.target .card-text {
    font-size: var(--text-lg);
  }

  .btn-secondary {
    padding: var(--sp-md) var(--sp-lg);
  }

  .app-footer {
    padding: var(--sp-lg);
    font-size: 0.75rem;
  }

  .footer-content p {
    margin: var(--sp-xs) 0;
  }
}

/* ===============================================
   Scrollbar Styling
   =============================================== */

.lesson-list::-webkit-scrollbar {
  width: 6px;
}

.lesson-list::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: 10px;
}

.lesson-list::-webkit-scrollbar-thumb {
  background: var(--border-dark);
  border-radius: 10px;
}

.lesson-list::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}