/* ==========================================================================
   AZ-104 Studieportaal — Modern Web Guidance Compliant Stylesheet
   ========================================================================== */

:root {
  /* Raw Light / Dark palette tokens */
  --brand-accent-light: #0067b8;
  --brand-accent-dark: #4cc2ff;
  --brand-accent-hover-light: #005293;
  --brand-accent-hover-dark: #75d0ff;

  --bg-canvas-light: #f4f6f9;
  --bg-canvas-dark: #0f172a;
  --bg-surface-light: #ffffff;
  --bg-surface-dark: #1e293b;
  --bg-elevated-light: #f8fafc;
  --bg-elevated-dark: #263449;

  --text-primary-light: #0f172a;
  --text-primary-dark: #f1f5f9;
  --text-secondary-light: #475569;
  --text-secondary-dark: #94a3b8;

  --border-color-light: #e2e8f0;
  --border-color-dark: #334155;

  --success-bg-light: #ecfdf5;
  --success-bg-dark: #064e3b;
  --success-text-light: #047857;
  --success-text-dark: #6ee7b7;

  --warning-bg-light: #fffbeb;
  --warning-bg-dark: #451a03;
  --warning-text-light: #b45309;
  --warning-text-dark: #fcd34d;

  --danger-bg-light: #fef2f2;
  --danger-bg-dark: #450a0a;
  --danger-text-light: #b91c1c;
  --danger-text-dark: #fca5a5;

  /* Default (Light) assignments */
  --accent-color: var(--brand-accent-light);
  --accent-hover: var(--brand-accent-hover-light);
  --bg-canvas: var(--bg-canvas-light);
  --bg-surface: var(--bg-surface-light);
  --bg-elevated: var(--bg-elevated-light);
  --text-primary: var(--text-primary-light);
  --text-secondary: var(--text-secondary-light);
  --border-color: var(--border-color-light);
  --success-bg: var(--success-bg-light);
  --success-text: var(--success-text-light);
  --warning-bg: var(--warning-bg-light);
  --warning-text: var(--warning-text-light);
  --danger-bg: var(--danger-bg-light);
  --danger-text: var(--danger-text-light);
  --progress-bar-track: #cbd5e1;
  --progress-bar-fill: var(--accent-color);

  /* MANDATORY: Fallback for browsers without light-dark support */
  @media (prefers-color-scheme: dark) {
    --accent-color: var(--brand-accent-dark);
    --accent-hover: var(--brand-accent-hover-dark);
    --bg-canvas: var(--bg-canvas-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-elevated: var(--bg-elevated-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --border-color: var(--border-color-dark);
    --success-bg: var(--success-bg-dark);
    --success-text: var(--success-text-dark);
    --warning-bg: var(--warning-bg-dark);
    --warning-text: var(--warning-text-dark);
    --danger-bg: var(--danger-bg-dark);
    --danger-text: var(--danger-text-dark);
    --progress-bar-track: #334155;
  }

  /* Use light-dark() when supported */
  @supports (color: light-dark(white, black)) {
    --accent-color: light-dark(var(--brand-accent-light), var(--brand-accent-dark));
    --accent-hover: light-dark(var(--brand-accent-hover-light), var(--brand-accent-hover-dark));
    --bg-canvas: light-dark(var(--bg-canvas-light), var(--bg-canvas-dark));
    --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
    --bg-elevated: light-dark(var(--bg-elevated-light), var(--bg-elevated-dark));
    --text-primary: light-dark(var(--text-primary-light), var(--text-primary-dark));
    --text-secondary: light-dark(var(--text-secondary-light), var(--text-secondary-dark));
    --border-color: light-dark(var(--border-color-light), var(--border-color-dark));
    --success-bg: light-dark(var(--success-bg-light), var(--success-bg-dark));
    --success-text: light-dark(var(--success-text-light), var(--success-text-dark));
    --warning-bg: light-dark(var(--warning-bg-light), var(--warning-bg-dark));
    --warning-text: light-dark(var(--warning-text-light), var(--warning-text-dark));
    --danger-bg: light-dark(var(--danger-bg-light), var(--danger-bg-dark));
    --danger-text: light-dark(var(--danger-text-light), var(--danger-text-dark));
    --progress-bar-track: light-dark(#cbd5e1, #334155);
  }

  /* MANDATORY: Apply color-scheme to :root for viewport-wide theming */
  color-scheme: light dark;
  accent-color: var(--accent-color);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgb(0 0 0 / 0.08);
  --shadow-md: 0 4px 16px rgb(0 0 0 / 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.6;
  accent-color: var(--accent-color);
}

/* Improve Text Layout & Legibility (modern-web-guidance) */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  line-height: 1.25;
  text-wrap: balance;
}

p, blockquote, li, .pretty-text {
  text-wrap: pretty;
}

pre, code {
  font-family: 'Cascadia Code', 'Consolas', 'Courier New', monospace;
}

pre {
  color-scheme: dark;
  accent-color: var(--accent-color);
  background: #0b1120;
  color: #e2e8f0;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  border: 1px solid #1e293b;
  font-size: 0.9rem;
  line-height: 1.55;
}

/* Styled Native <progress> Bar (modern-web-guidance) */
progress {
  appearance: none;
  border: 0 solid;
  overflow: clip;
  --progress-bar-radius: 1e5px;
  border-radius: var(--progress-bar-radius);
  background: var(--progress-bar-track);
  box-shadow: inset 0 1px 2px rgb(0 0 0 / 0.1);
  inline-size: 100%;
  block-size: 10px;
  container-type: inline-size;
  --progress-bar-indeterminate-size: 30%;
  --progress-bar-indeterminate-animation-duration: 1.5s;
}

@media (prefers-reduced-motion: reduce) {
  progress {
    --progress-bar-indeterminate-animation-duration: 10s;
  }
}

progress:indeterminate {
  --progress-bar-animation: var(
    --progress-bar-indeterminate-animation,
    progress-bar-indeterminate var(--progress-bar-indeterminate-animation-duration) infinite linear
  );
}

progress::-webkit-progress-bar {
  background: transparent;
}

/* WebKit/Blink separate rule */
progress::-webkit-progress-value {
  background: var(--progress-bar-fill, var(--accent-color));
  border-radius: var(--progress-bar-radius);
  transition: inline-size 0.3s;
  animation: var(--progress-bar-animation, revert-rule);
}

/* Firefox separate rule (never grouped with -webkit-) */
progress::-moz-progress-bar {
  background: var(--progress-bar-fill, var(--accent-color));
  border-radius: var(--progress-bar-radius);
  transition: inline-size 0.3s;
  animation: var(--progress-bar-animation, revert-rule);
}

@keyframes progress-bar-indeterminate {
  from, to {
    inline-size: var(--progress-bar-indeterminate-size);
    margin-right: auto;
  }
  from { translate: -100%; }
  to { translate: 100cqi; }
}

/* Fallback for older browsers without accent-color */
@supports not (accent-color: var(--accent-color)) {
  form input[type="checkbox"].visually-hidden {
    position: absolute !important;
    clip-path: inset(50%) !important;
    overflow: hidden !important;
    width: 1px !important;
    height: 1px !important;
    margin: -1px !important;
    padding: 0 !important;
    border: 0 !important;
    white-space: nowrap !important;
  }

  label.checkbox-fallback-label {
    position: relative;
    padding-left: 2rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
  }

  input[type="checkbox"] + span::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1.2rem;
    height: 1.2rem;
    border: 2px solid #ccc;
    background: white;
    border-radius: 4px;
    box-sizing: border-box;
    transition: all 0.2s ease;
  }

  input[type="checkbox"]:focus-visible + span::before {
    outline: 2px solid #000;
    outline-offset: 2px;
  }

  input[type="checkbox"]:checked + span::before {
    background-color: var(--accent-color, #0067b8);
    border-color: var(--accent-color, #0067b8);
  }

  input[type="checkbox"]:checked + span::after {
    content: "✓";
    position: absolute;
    left: 0.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: white;
    font-weight: bold;
    font-size: 0.9rem;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

[hidden] {
  display: none !important;
}

/* ==========================================================================
   Buttons & Badges
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.2rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background-color: #0067b8;
  color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
  background-color: #005293;
}

.btn-secondary {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent-color);
}

.btn-accent {
  background: linear-gradient(135deg, #0067b8, #004e8c);
  color: #ffffff;
}

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

.btn-ghost:hover:not(:disabled) {
  background-color: var(--bg-elevated);
}

.btn-text {
  background: none;
  border: none;
  color: var(--accent-color);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.15rem 0.4rem;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.1rem;
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
}

.btn-full {
  width: 100%;
}

.azure-badge {
  display: inline-block;
  background: #0067b8;
  color: #ffffff;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.azure-badge-sm {
  background: #0067b8;
  color: #ffffff;
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.badge-success {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: transparent;
}

.badge-warning {
  background: var(--warning-bg);
  color: var(--warning-text);
  border-color: transparent;
}

.badge-danger {
  background: var(--danger-bg);
  color: var(--danger-text);
  border-color: transparent;
}

/* ==========================================================================
   Auth Screen
   ========================================================================== */

.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.25rem;
  background: radial-gradient(circle at top left, rgb(0 103 184 / 0.14), transparent 55%), var(--bg-canvas);
}

.auth-container {
  max-width: 980px;
  width: 100%;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

@media (max-width: 820px) {
  .auth-container {
    grid-template-columns: 1fr;
  }
}

.auth-brand h1 {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.auth-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

.auth-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.highlight-pill {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.auth-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-elevated);
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
}

.auth-tab {
  background: transparent;
  border: none;
  padding: 0.6rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: 4px;
  cursor: pointer;
}

.auth-tab.active {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.auth-form h2 {
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
}

.form-group {
  margin-bottom: 1.15rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

.label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.35rem;
}

.label-row label {
  margin-bottom: 0;
}

.form-group input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-canvas);
  color: var(--text-primary);
}

.form-group input:focus {
  outline: 2px solid var(--accent-color);
  border-color: transparent;
}

.auth-alert {
  background: var(--danger-bg);
  color: var(--danger-text);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.auth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 1.25rem 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}

.auth-divider span {
  padding: 0 0.75rem;
}

/* ==========================================================================
   Main App Shell, Topbar & Sidebar
   ========================================================================== */

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0.65rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  font-weight: 700;
}

.topbar-center {
  flex: 1;
  max-width: 360px;
  min-width: 200px;
}

.global-progress-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.user-Chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--border-color);
}

.user-name {
  font-size: 0.9rem;
  font-weight: 600;
}

.main-layout {
  display: flex;
  flex: 1;
}

.sidebar {
  width: 320px;
  flex-shrink: 0;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  padding: 1.25rem 1rem;
  overflow-y: auto;
  max-height: calc(100vh - 60px);
  position: sticky;
  top: 60px;
}

.sidebar.collapsed {
  display: none;
}

@media (max-width: 960px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 60px;
    bottom: 0;
    z-index: 25;
    box-shadow: var(--shadow-md);
  }
}

.sidebar-header h2 {
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.sidebar-caption {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0;
  margin-bottom: 1rem;
}

.sidebar-module-group {
  margin-bottom: 1.1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-elevated);
}

.sidebar-module-title {
  padding: 0.65rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
}

.sidebar-lesson-btn {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-color);
  padding: 0.6rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 0.85rem;
  transition: background-color 0.15s;
}

.sidebar-lesson-btn:last-child {
  border-bottom: none;
}

.sidebar-lesson-btn:hover {
  background: var(--bg-surface);
}

.sidebar-lesson-btn.active {
  background: rgb(0 103 184 / 0.12);
  font-weight: 700;
  border-left: 3px solid var(--accent-color);
}

.lesson-status-dot {
  flex-shrink: 0;
  font-size: 0.85rem;
}

.main-workspace {
  flex: 1;
  padding: 2rem;
  max-width: 1140px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 640px) {
  .main-workspace {
    padding: 1.15rem;
  }
}

/* ==========================================================================
   Dashboard View
   ========================================================================== */

.hero-banner {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 2rem;
  align-items: center;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

@media (max-width: 860px) {
  .hero-banner {
    grid-template-columns: 1fr;
  }
}

.eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-color);
  display: block;
  margin-bottom: 0.4rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.hero-stats-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: grid;
  gap: 1rem;
}

.stat-metric {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border-color);
}

.stat-metric:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.stat-value {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-color);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.exam-banner {
  background: linear-gradient(135deg, rgb(0 103 184 / 0.1), rgb(0 103 184 / 0.03));
  border: 1px solid var(--accent-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.exam-banner h2 {
  font-size: 1.25rem;
  margin-bottom: 0.35rem;
}

.exam-banner p {
  margin: 0;
  color: var(--text-secondary);
  max-width: 680px;
}

.section-heading-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.modules-grid {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.module-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.module-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.module-card-title {
  font-size: 1.2rem;
  margin-bottom: 0.2rem;
}

.module-card-sub {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.module-lessons-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.85rem;
  margin-top: 1.15rem;
}

.lesson-mini-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.75rem;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
}

.lesson-mini-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-1px);
}

.lesson-mini-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-color);
}

.lesson-mini-title {
  font-weight: 700;
  font-size: 0.98rem;
  margin: 0.25rem 0;
}

.lesson-mini-summary {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin: 0;
}

/* ==========================================================================
   Lesson View, Study Content, Tables, Sources & Short Quiz
   ========================================================================== */

.lesson-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.lesson-meta-pills {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.lesson-article {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.lesson-header h1 {
  font-size: 1.85rem;
  margin-bottom: 0.5rem;
}

.lesson-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.lesson-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 1.75rem;
  overflow-x: auto;
}

.lesson-tab {
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 0.75rem 1.15rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  margin-bottom: -2px;
}

.lesson-tab.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
}

.study-section {
  margin-bottom: 2.25rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-color);
}

.study-section h2 {
  font-size: 1.3rem;
  color: var(--accent-color);
  margin-bottom: 0.75rem;
}

.study-body p {
  margin-top: 0;
  margin-bottom: 0.9rem;
}

.study-body ul,
.study-body ol {
  padding-left: 1.35rem;
  margin-bottom: 1rem;
}

.study-body li {
  margin-bottom: 0.4rem;
}

.study-body blockquote {
  margin: 1rem 0;
  padding: 0.9rem 1.15rem;
  background: var(--bg-elevated);
  border-left: 4px solid var(--accent-color);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.table-responsive {
  overflow-x: auto;
  margin: 1.15rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: top;
}

.data-table th {
  background: var(--bg-elevated);
  font-weight: 700;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.code-block-wrapper {
  margin: 1.25rem 0;
}

.code-block-header {
  background: #1e293b;
  color: #cbd5e1;
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.code-block-wrapper pre {
  margin-top: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.exam-tips-box {
  background: var(--warning-bg);
  border: 1px solid var(--warning-text);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  margin: 1.75rem 0;
}

.exam-tips-box h3 {
  color: var(--warning-text);
  margin-bottom: 0.75rem;
}

.exam-tips-box li {
  margin-bottom: 0.5rem;
}

.pane-footer-cta {
  display: flex;
  justify-content: flex-end;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

/* External Sources & Checklist */
.sources-list {
  display: grid;
  gap: 1rem;
  margin-bottom: 2rem;
}

.source-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.source-card a {
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--accent-color);
  text-decoration: none;
}

.source-card a:hover {
  text-decoration: underline;
}

.source-relevance {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  padding: 0.65rem 0.9rem;
  background: var(--bg-surface);
  border-left: 3px solid var(--accent-color);
  border-radius: 4px;
}

.checklist-list {
  display: grid;
  gap: 0.65rem;
  margin-bottom: 2rem;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.checklist-item input[type="checkbox"] {
  width: 1.15rem;
  height: 1.15rem;
  margin-top: 0.2rem;
  flex-shrink: 0;
}

.notes-block {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.notes-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.65rem;
}

.notes-header h2 {
  font-size: 1.1rem;
  margin: 0;
}

.save-indicator {
  font-size: 0.8rem;
  color: var(--success-text);
  font-weight: 600;
}

#lesson-notes-textarea {
  width: 100%;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
}

.notes-actions {
  margin-top: 0.65rem;
  display: flex;
  justify-content: flex-end;
}

/* Short Quiz (Korte Overhoring) */
.quiz-intro-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.25rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
}

.quiz-best-score {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent-color);
}

.quiz-result-banner {
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.quiz-result-banner.passed {
  background: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-text);
}

.quiz-result-banner.failed {
  background: var(--danger-bg);
  color: var(--danger-text);
  border: 1px solid var(--danger-text);
}

.quiz-question-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  margin-bottom: 1.25rem;
}

.quiz-question-title {
  font-weight: 700;
  font-size: 1.02rem;
  margin-bottom: 1rem;
  white-space: pre-line;
}

.quiz-option-label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.7rem 0.95rem;
  margin-bottom: 0.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.quiz-option-label:hover {
  border-color: var(--accent-color);
}

.quiz-option-label.correct-choice {
  background: var(--success-bg);
  border-color: var(--success-text);
  font-weight: 600;
}

.quiz-option-label.wrong-choice {
  background: var(--danger-bg);
  border-color: var(--danger-text);
}

.quiz-explanation {
  margin-top: 0.85rem;
  padding: 0.85rem 1rem;
  background: var(--bg-surface);
  border-left: 4px solid var(--accent-color);
  border-radius: 4px;
  font-size: 0.9rem;
}

.quiz-submit-row {
  display: flex;
  gap: 1rem;
  margin-top: 1.25rem;
}

.lesson-step-footer {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

/* ==========================================================================
   Final Exam Simulator View
   ========================================================================== */

.exam-lobby-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
  box-shadow: var(--shadow-sm);
}

.exam-specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.spec-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.spec-box strong {
  font-size: 1.25rem;
  color: var(--accent-color);
}

.spec-box span {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.exam-locked-warning {
  background: var(--warning-bg);
  color: var(--warning-text);
  border: 1px solid var(--warning-text);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
}

.exam-start-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.exam-Hud {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.hud-center {
  flex: 1;
  max-width: 340px;
}

.hud-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.exam-timer {
  font-family: monospace;
  font-size: 1.15rem;
  font-weight: 800;
  padding: 0.35rem 0.75rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
}

.exam-workspace-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .exam-workspace-grid {
    grid-template-columns: 1fr;
  }
}

.exam-question-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.exam-q-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.flag-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
}

.exam-scenario-box {
  background: var(--bg-elevated);
  border-left: 4px solid var(--accent-color);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.exam-q-title {
  font-size: 1.2rem;
  margin-bottom: 1.25rem;
}

.exam-q-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

.exam-navigator-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.navigator-legend {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1rem;
}

.legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.legend-dot.answered {
  background: #0067b8;
}

.legend-dot.flagged {
  background: #f59e0b;
}

.exam-palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.4rem;
}

.palette-btn {
  padding: 0.45rem 0;
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-elevated);
  color: var(--text-primary);
  cursor: pointer;
}

.palette-btn.current {
  outline: 2px solid var(--accent-color);
}

.palette-btn.answered {
  background: #0067b8;
  color: #ffffff;
  border-color: #0067b8;
}

.palette-btn.flagged {
  border-color: #f59e0b;
  box-shadow: inset 0 0 0 2px #f59e0b;
}

/* Exam Results */
.exam-score-hero {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

.score-big-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--accent-color);
}

.domain-breakdown-card,
.exam-review-card,
.history-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}

.domain-bar-row {
  margin-bottom: 1rem;
}

.domain-bar-labels {
  display: flex;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
}

.review-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.review-filters {
  display: flex;
  gap: 0.5rem;
}

.review-filters .btn.active {
  background: #0067b8;
  color: #ffffff;
}

/* Native <dialog> Modal */
.modal-dialog {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  max-width: 460px;
  width: 90%;
  box-shadow: var(--shadow-md);
}

.modal-dialog::backdrop {
  background: rgb(0 0 0 / 0.55);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.5rem;
}