/* ==========================================================================
   LERNKOMPASS B1 - Kognitive Sprach-Auditor & Zeitkompressions-Matrix
   Design Tokens & Scoped UI Stylesheet (Scoped to #lernkompass-app)
   ========================================================================== */

:root {
  --lk-canvas: #FFFFFF;
  --lk-surface: #F8FAFC;
  --lk-surface-muted: #F1F5F9;
  --lk-surface-dark: #0F172A;
  
  --lk-text-primary: #0F172A;
  --lk-text-secondary: #475569;
  --lk-text-muted: #64748B;
  --lk-text-inverse: #FFFFFF;
  --lk-text-accent: #059669;

  --lk-brand-primary: #059669;
  --lk-brand-optimal: #047857;
  --lk-brand-light: #ECFDF5;
  --lk-brand-navy: #1E293B;

  --lk-border-subtle: #E2E8F0;
  --lk-border-strong: #CBD5E1;
  --lk-border-accent: #059669;

  --lk-font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --lk-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --lk-radius-sm: 4px;
  --lk-radius-md: 8px;
  --lk-radius-lg: 12px;
  --lk-radius-pill: 9999px;

  --lk-shadow-subtle: 0 1px 3px rgba(15, 23, 42, 0.08);
  --lk-shadow-card: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --lk-shadow-active: 0 10px 15px -3px rgba(5, 150, 105, 0.12), 0 4px 6px -4px rgba(5, 150, 105, 0.1);
}

/* Base Container Scoped */
#lernkompass-app {
  font-family: var(--lk-font-sans);
  color: var(--lk-text-primary);
  background-color: var(--lk-canvas);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 16px;
  box-sizing: border-box;
}

#lernkompass-app * {
  box-sizing: border-box;
}

/* Header & Progress Bar */
.lk-header {
  margin-bottom: 24px;
}

.lk-top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.lk-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: none;
  font-family: var(--lk-font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--lk-text-muted);
  cursor: pointer;
  padding: 6px 10px;
  border-radius: var(--lk-radius-md);
  transition: all 0.2s ease;
}

.lk-back-btn:hover:not(:disabled) {
  background-color: var(--lk-surface-muted);
  color: var(--lk-text-primary);
}

.lk-back-btn:disabled {
  opacity: 0;
  pointer-events: none;
}

.lk-phase-badge {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: var(--lk-radius-pill);
  background-color: var(--lk-surface-muted);
  color: var(--lk-brand-navy);
}

.lk-phase-badge.highlight {
  background-color: var(--lk-brand-light);
  color: var(--lk-brand-primary);
}

.lk-progress-container {
  width: 100%;
  height: 6px;
  background-color: var(--lk-surface-muted);
  border-radius: var(--lk-radius-pill);
  overflow: hidden;
  position: relative;
}

.lk-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #10B981, #059669);
  width: 7%;
  border-radius: var(--lk-radius-pill);
  transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.lk-progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--lk-text-muted);
  margin-top: 6px;
  font-weight: 500;
}

/* Card Content Area */
.lk-card {
  background-color: var(--lk-surface);
  border: 1px solid var(--lk-border-subtle);
  border-radius: var(--lk-radius-lg);
  padding: 24px;
  box-shadow: var(--lk-shadow-card);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

@media (max-width: 640px) {
  .lk-card {
    padding: 18px 16px;
  }
}

.lk-step-meta {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--lk-brand-primary);
  margin-bottom: 6px;
}

.lk-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--lk-text-primary);
  line-height: 1.3;
  margin-bottom: 8px;
}

.lk-question-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--lk-brand-navy);
  line-height: 1.45;
  margin-bottom: 20px;
}

/* Options Grid / List */
.lk-options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.lk-option-btn {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  text-align: left;
  background-color: var(--lk-canvas);
  border: 1.5px solid var(--lk-border-subtle);
  border-radius: var(--lk-radius-md);
  padding: 14px 16px;
  cursor: pointer;
  font-family: var(--lk-font-sans);
  color: var(--lk-text-primary);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 56px;
  -webkit-tap-highlight-color: transparent;
}

.lk-option-btn:hover {
  border-color: var(--lk-brand-primary);
  background-color: #FAFCFB;
  transform: translateY(-1px);
  box-shadow: var(--lk-shadow-subtle);
}

.lk-option-btn:active {
  transform: scale(0.99);
}

.lk-option-btn.selected {
  background-color: var(--lk-brand-light);
  border-color: var(--lk-brand-primary);
  box-shadow: var(--lk-shadow-active);
}

.lk-option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  background-color: var(--lk-surface-muted);
  border: 1px solid var(--lk-border-strong);
  border-radius: var(--lk-radius-sm);
  font-family: var(--lk-font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--lk-text-secondary);
  transition: all 0.2s ease;
}

.lk-option-btn:hover .lk-option-letter {
  border-color: var(--lk-brand-primary);
  color: var(--lk-brand-primary);
}

.lk-option-btn.selected .lk-option-letter {
  background-color: var(--lk-brand-primary);
  border-color: var(--lk-brand-primary);
  color: var(--lk-text-inverse);
}

.lk-option-body {
  flex: 1;
  font-size: 14px;
  line-height: 1.45;
  color: var(--lk-text-primary);
  font-weight: 400;
  padding-top: 2px;
}

.lk-option-btn.selected .lk-option-body {
  font-weight: 500;
  color: #064E3B;
}

/* Milestone Screens (Step 6, Step 10) */
.lk-milestone-box {
  background-color: #FFFFFF;
  border: 1px solid var(--lk-border-subtle);
  border-radius: var(--lk-radius-md);
  padding: 20px;
  margin: 16px 0 24px 0;
}

.lk-milestone-box h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--lk-brand-navy);
  margin-bottom: 10px;
}

.lk-milestone-box p {
  font-size: 14px;
  color: var(--lk-text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
}

.lk-milestone-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.lk-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--lk-brand-primary);
  color: var(--lk-text-inverse);
  font-family: var(--lk-font-sans);
  font-size: 15px;
  font-weight: 600;
  padding: 14px 22px;
  border-radius: var(--lk-radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  min-height: 52px;
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(5, 150, 105, 0.2);
  width: 100%;
}

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

.lk-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--lk-canvas);
  color: var(--lk-brand-navy);
  font-family: var(--lk-font-sans);
  font-size: 14px;
  font-weight: 600;
  padding: 13px 20px;
  border-radius: var(--lk-radius-md);
  border: 1.5px solid var(--lk-border-strong);
  cursor: pointer;
  min-height: 50px;
  transition: all 0.2s ease;
  width: 100%;
}

.lk-btn-secondary:hover {
  background-color: var(--lk-surface-muted);
  border-color: var(--lk-brand-navy);
}

.lk-notice-badge {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  background-color: var(--lk-surface-muted);
  border-left: 3px solid #0284C7;
  padding: 10px 12px;
  border-radius: 0 var(--lk-radius-sm) var(--lk-radius-sm) 0;
  font-size: 12px;
  color: var(--lk-text-secondary);
  margin-top: 16px;
  line-height: 1.4;
}

/* Forms (Step 14) */
.lk-form-group {
  margin-bottom: 16px;
}

.lk-form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--lk-text-primary);
  margin-bottom: 6px;
}

.lk-input {
  width: 100%;
  min-height: 50px;
  padding: 12px 14px;
  font-family: var(--lk-font-sans);
  font-size: 15px;
  border: 1.5px solid var(--lk-border-strong);
  border-radius: var(--lk-radius-md);
  color: var(--lk-text-primary);
  background-color: var(--lk-canvas);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.lk-input:focus {
  outline: none;
  border-color: var(--lk-brand-primary);
  box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
}

.lk-input.has-error {
  border-color: #DC2626;
  background-color: #FEF2F2;
}

.lk-error-text {
  font-size: 12px;
  color: #DC2626;
  margin-top: 4px;
  display: none;
}

.lk-error-text.visible {
  display: block;
}

/* Completion Queue Screen */
.lk-success-header {
  text-align: center;
  padding: 16px 0 8px 0;
}

.lk-success-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background-color: var(--lk-brand-light);
  border-radius: var(--lk-radius-pill);
  margin-bottom: 12px;
}

.lk-case-id-display {
  display: inline-block;
  font-family: var(--lk-font-mono);
  font-size: 14px;
  font-weight: 700;
  background-color: var(--lk-surface-muted);
  color: var(--lk-brand-navy);
  padding: 6px 14px;
  border-radius: var(--lk-radius-md);
  border: 1px solid var(--lk-border-strong);
  margin: 10px 0;
}

.lk-stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 18px 0;
}

@media (max-width: 500px) {
  .lk-stat-grid {
    grid-template-columns: 1fr;
  }
}

.lk-stat-card {
  background: #FFFFFF;
  border: 1px solid var(--lk-border-subtle);
  border-radius: var(--lk-radius-md);
  padding: 14px;
  border-top: 3px solid var(--lk-brand-primary);
}

.lk-stat-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--lk-text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.lk-stat-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--lk-brand-navy);
}

.lk-json-inspector {
  margin-top: 24px;
  border-top: 1px dashed var(--lk-border-strong);
  padding-top: 16px;
}

.lk-json-toggle {
  background: none;
  border: none;
  font-family: var(--lk-font-mono);
  font-size: 12px;
  color: var(--lk-text-muted);
  cursor: pointer;
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.lk-json-toggle:hover {
  color: var(--lk-brand-primary);
}

.lk-json-pre {
  background-color: var(--lk-surface-dark);
  color: #A7F3D0;
  font-family: var(--lk-font-mono);
  font-size: 11px;
  padding: 14px;
  border-radius: var(--lk-radius-md);
  overflow-x: auto;
  margin-top: 8px;
  display: none;
}

.lk-json-pre.visible {
  display: block;
}