/* Premium Glassmorphic Stylesheet - MOAEDU Webbook Platform */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
  --font-sans: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Modern HSL Color Tokens */
  --primary-hue: 220;
  --primary: hsl(var(--primary-hue), 90%, 56%);
  --primary-hover: hsl(var(--primary-hue), 95%, 48%);
  --primary-light: hsl(var(--primary-hue), 90%, 96%);
  
  --bg-app: #f8fafc;
  --bg-glass: rgba(255, 255, 255, 0.7);
  --border-glass: rgba(255, 255, 255, 0.6);
  --border-card: rgba(148, 163, 184, 0.15);
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-inverse: #ffffff;
  
  --shadow-sm: 0 2px 8px -1px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 16px -6px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 40px -10px rgba(15, 23, 42, 0.12);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --blur-val: 20px;
}

[data-theme="dark"] {
  --bg-app: #090d16;
  --bg-glass: rgba(15, 23, 42, 0.6);
  --border-glass: rgba(255, 255, 255, 0.06);
  --border-card: rgba(255, 255, 255, 0.08);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-inverse: #090d16;
  
  --shadow-sm: 0 2px 8px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

/* Base Layout & Wrapper */
.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 12px 100px;
}

/* Glassmorphism Header */
header.app-header {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-val));
  -webkit-backdrop-filter: blur(var(--blur-val));
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  box-shadow: var(--shadow-md);
  transition: var(--transition-smooth);
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-badge {
  background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
  color: #fff;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  letter-spacing: 0.5px;
}

.header-title h1 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.header-title p {
  font-size: 12px;
  color: var(--text-muted);
}

/* Controls */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-card);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

/* Certification Picker Dashboard */
.certification-picker {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.cert-card {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-val));
  -webkit-backdrop-filter: blur(var(--blur-val));
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 24px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.cert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.cert-category {
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 12px;
}

.cert-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.cert-summary {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.cert-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

.cert-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Main Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 768px) {
  .app-container {
    padding: 8px 4px 80px;
  }
  header.app-header {
    padding: 12px 16px;
    margin-bottom: 16px;
  }
  .dashboard-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .sidebar-panel {
    padding: 16px;
  }
  .search-filter-bar {
    padding: 12px;
    gap: 8px;
  }
  .topic-card {
    padding: 16px;
  }
}

/* Left Sidebar (Progress & Nav) */
.sidebar-panel {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-val));
  -webkit-backdrop-filter: blur(var(--blur-val));
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 24px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 12px;
}

.progress-percentage {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
}

.progress-bar-bg {
  background: var(--border-card);
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 24px;
}

.progress-bar-fill {
  background: linear-gradient(90deg, var(--primary) 0%, #3b82f6 100%);
  height: 100%;
  width: 0%;
  border-radius: 4px;
  transition: width 0.6s cubic-bezier(0.1, 0.8, 0.25, 1);
}

/* Sidebar Parts List Navigation */
.part-nav-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
}

.part-nav-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-main);
  text-align: left;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition-smooth);
  width: 100%;
}

.part-nav-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.part-nav-btn.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

/* Top Nav Filters & Search Bar */
.search-filter-bar {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-val));
  -webkit-backdrop-filter: blur(var(--blur-val));
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
  min-width: 240px;
}

.search-input-wrapper input {
  width: 100%;
  padding: 12px 16px 12px 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-card);
  background: var(--bg-app);
  color: var(--text-main);
  font-size: 14px;
  transition: var(--transition-smooth);
}

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

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* Mode Switches (Study vs Problem Solving vs Wrong Answer) */
.mode-selectors {
  display: flex;
  gap: 4px;
  background: var(--border-card);
  padding: 4px;
  border-radius: var(--radius-sm);
}

.mode-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.mode-btn.active {
  background: var(--bg-glass);
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

/* Topic Cards */
.topic-card {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-val));
  -webkit-backdrop-filter: blur(var(--blur-val));
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  animation: fadeIn 0.4s ease;
}

.topic-card:hover {
  box-shadow: var(--shadow-md);
}

.topic-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.topic-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.badge {
  font-size: 11px;
  font-weight: 700;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 10px;
  border-radius: 12px;
}

/* Topic Body Contents */
.topic-definition {
  font-size: 15px;
  background: var(--border-card);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  border-left: 4px solid var(--primary);
}

.points-list {
  padding-left: 20px;
  margin-bottom: 18px;
}

.points-list li {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.points-list li::marker {
  color: var(--primary);
}

.model-answer-box {
  background: var(--primary-light);
  color: var(--text-main);
  padding: 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  border: 1px dashed var(--primary);
  animation: slideDown 0.3s ease;
}

.model-answer-box strong {
  display: block;
  font-size: 12px;
  color: var(--primary);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Textarea input inside Quiz Mode */
.quiz-input-wrapper {
  margin-bottom: 16px;
  width: 100%;
}

.quiz-textarea {
  width: 100%;
  min-height: 100px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-card);
  background: var(--bg-app);
  color: var(--text-main);
  padding: 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  resize: vertical;
  transition: var(--transition-smooth);
}

.quiz-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.quiz-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 12px;
}

/* Graded Actions buttons */
.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-correct {
  background: #10b981;
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-correct:hover {
  background: #059669;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

.btn-incorrect {
  background: #ef4444;
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-incorrect:hover {
  background: #dc2626;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.25);
}

/* Self Check Checkbox Row */
.check-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-card);
}

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

.check-row label {
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.check-row small {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
}

/* User Private Note panel */
.user-memo-panel {
  margin-top: 12px;
  background: var(--border-card);
  padding: 12px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.user-memo-input {
  background: var(--bg-app);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 8px 12px;
  font-size: 13px;
  border-radius: 6px;
  width: 100%;
}

/* Dynamic Schedule Planner */
.schedule-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.plan-item {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-val));
  -webkit-backdrop-filter: blur(var(--blur-val));
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  transition: var(--transition-smooth);
}

.plan-item:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.day-chip {
  background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
}

/* Bottom Nav bar for mobile views */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-val));
  -webkit-backdrop-filter: blur(var(--blur-val));
  border-top: 1px solid var(--border-glass);
  display: flex;
  justify-content: space-around;
  padding: 10px 0;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.05);
  z-index: 50;
}

.nav-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  transition: var(--transition-smooth);
}

.nav-btn:hover, .nav-btn.active {
  color: var(--primary);
}

.floating-top {
  position: fixed;
  bottom: 80px;
  right: 20px;
  background: var(--primary);
  color: #fff;
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  font-weight: 700;
  box-shadow: var(--shadow-md);
  z-index: 40;
  transition: var(--transition-smooth);
}

.floating-top:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
}

/* CSS Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; max-height: 0; overflow: hidden; }
  to { opacity: 1; max-height: 200px; }
}

/* Empty States */
.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  font-size: 14px;
}

/* PWA Install Promotion Banner Styling */
.pwa-install-banner {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border: 1px solid #bfdbfe;
  color: #1e3a8a;
  transition: var(--transition-smooth);
}

[data-theme="dark"] .pwa-install-banner {
  background: linear-gradient(135deg, #0f172a 0%, #020617 100%);
  border: 1px solid #1e293b;
  color: #f8fafc;
}

[data-theme="dark"] .pwa-install-banner h4 {
  color: #38bdf8 !important;
}

[data-theme="dark"] .pwa-install-banner p {
  color: #94a3b8 !important;
}