/* ========================================
   Learning Modnitor - Custom Styles
   Dark-mode learning platform for backend metrics
   ======================================== */

/* Base */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: #0a0a0f;
}

body.ready {
  animation: bodyFadeIn 0.2s ease-out forwards;
}

@keyframes bodyFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ========================================
   Custom Scrollbar (Dark Mode)
   ======================================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #0a0a0f;
}

::-webkit-scrollbar-thumb {
  background: #374151;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #4b5563;
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: #374151 #0a0a0f;
}

/* ========================================
   Progress Bar
   ======================================== */
.progress-bar-track {
  background: #1f2937;
  border-radius: 9999px;
  overflow: hidden;
  height: 12px;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 9999px;
  background: linear-gradient(90deg, #6366f1, #8b5cf6, #a78bfa);
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.15) 50%,
    transparent 100%
  );
  animation: progress-shimmer 2s ease-in-out infinite;
}

@keyframes progress-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ========================================
   Module Cards
   ======================================== */
.module-card {
  background: linear-gradient(145deg, #111827, #1a1f2e);
  border: 1px solid #1f2937;
  border-radius: 16px;
  padding: 1.75rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #6366f1, #8b5cf6);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.module-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.3);
}

.module-card:hover::before {
  opacity: 1;
}

.module-card.completed {
  border-color: rgba(34, 197, 94, 0.3);
}

.module-card.completed::before {
  background: linear-gradient(90deg, #22c55e, #16a34a);
  opacity: 1;
}

.module-number {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  flex-shrink: 0;
}

.module-card.completed .module-number {
  background: linear-gradient(135deg, #22c55e, #16a34a);
}

.completion-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-complete {
  background: rgba(34, 197, 94, 0.15);
  color: #4ade80;
  border: 1px solid rgba(34, 197, 94, 0.25);
}

.badge-incomplete {
  background: rgba(107, 114, 128, 0.15);
  color: #9ca3af;
  border: 1px solid rgba(107, 114, 128, 0.25);
}

.badge-quiz {
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  border: 1px solid rgba(99, 102, 241, 0.25);
}

/* ========================================
   Code Blocks (Prism Tomorrow complement)
   ======================================== */
pre[class*="language-"] {
  border-radius: 12px !important;
  padding: 1.25rem !important;
  margin: 1.25rem 0 !important;
  border: 1px solid #2d3748 !important;
  background: #1a1b26 !important;
  font-size: 0.875rem !important;
  line-height: 1.7 !important;
}

code[class*="language-"] {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace !important;
  font-size: 0.875rem !important;
}

:not(pre) > code {
  background: rgba(99, 102, 241, 0.15);
  color: #c7d2fe;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ========================================
   Quiz Styles
   ======================================== */
.quiz-wrapper {
  margin-top: 2rem;
  padding: 2rem;
  background: linear-gradient(145deg, #111827, #0f1219);
  border: 1px solid #1f2937;
  border-radius: 16px;
}

.quiz-question {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid #1f2937;
  border-radius: 12px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.quiz-question-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.quiz-question-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  font-weight: 700;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.quiz-question-text {
  color: #e5e7eb;
  font-size: 1rem;
  line-height: 1.6;
  padding-top: 0.35rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  margin-left: 0.5rem;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid #2d3748;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  color: #d1d5db;
}

.quiz-option:hover {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.3);
  color: #e5e7eb;
}

.quiz-option.selected {
  background: rgba(99, 102, 241, 0.12);
  border-color: #6366f1;
  color: #fff;
}

.quiz-option-indicator {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid #4b5563;
  flex-shrink: 0;
  transition: all 0.2s ease;
  position: relative;
}

.quiz-option.selected .quiz-option-indicator {
  border-color: #6366f1;
  background: #6366f1;
}

.quiz-option.selected .quiz-option-indicator::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: white;
}

.quiz-option-text {
  font-size: 0.9375rem;
  line-height: 1.5;
}

.quiz-short-answer {
  margin-left: 0.5rem;
}

.quiz-text-input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid #2d3748;
  border-radius: 10px;
  color: #e5e7eb;
  font-size: 0.9375rem;
  outline: none;
  transition: all 0.2s ease;
}

.quiz-text-input:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.quiz-text-input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.quiz-actions {
  margin-top: 1.5rem;
  text-align: center;
}

.quiz-submit-btn {
  padding: 0.875rem 2.5rem;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.quiz-submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
}

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

/* Quiz Results */
.quiz-results-summary {
  margin-top: 2rem;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid #2d3748;
  border-radius: 12px;
  text-align: center;
}

.quiz-results-animate {
  animation: quiz-slide-in 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes quiz-slide-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.quiz-score-display {
  display: inline-flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.quiz-score-number {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
}

.quiz-score-divider {
  font-size: 1.5rem;
  color: #6b7280;
  margin: 0 0.125rem;
}

.quiz-score-total {
  font-size: 1.5rem;
  font-weight: 600;
  color: #9ca3af;
}

.quiz-score-text {
  color: #9ca3af;
  font-size: 0.9375rem;
}

.quiz-grade-high .quiz-score-number { color: #4ade80; }
.quiz-grade-mid .quiz-score-number { color: #fbbf24; }
.quiz-grade-low .quiz-score-number { color: #f87171; }

/* Quiz Feedback */
.quiz-feedback {
  margin-top: 1rem;
  overflow: hidden;
}

.quiz-feedback-animate {
  animation: quiz-feedback-appear 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes quiz-feedback-appear {
  from {
    opacity: 0;
    max-height: 0;
  }
  to {
    opacity: 1;
    max-height: 200px;
  }
}

.quiz-feedback-correct {
  color: #4ade80;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quiz-feedback-wrong {
  color: #f87171;
  font-weight: 600;
}

.quiz-wrong-icon {
  margin-right: 0.375rem;
}

.quiz-correct-answer {
  margin-top: 0.5rem;
  color: #9ca3af;
  font-weight: 400;
  font-size: 0.875rem;
}

.quiz-explanation {
  margin-top: 0.625rem;
  padding: 0.75rem 1rem;
  background: rgba(99, 102, 241, 0.08);
  border-left: 3px solid #6366f1;
  border-radius: 0 8px 8px 0;
  color: #c7d2fe;
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Quiz correct/wrong question highlight */
.quiz-question.quiz-correct {
  border-color: rgba(34, 197, 94, 0.3);
  box-shadow: inset 0 0 0 1px rgba(34, 197, 94, 0.1);
  animation: flash-green 0.6s ease;
}

.quiz-question.quiz-wrong {
  border-color: rgba(248, 113, 113, 0.3);
  box-shadow: inset 0 0 0 1px rgba(248, 113, 113, 0.1);
  animation: flash-red 0.6s ease;
}

@keyframes flash-green {
  0%, 100% { background: rgba(255, 255, 255, 0.02); }
  50% { background: rgba(34, 197, 94, 0.08); }
}

@keyframes flash-red {
  0%, 100% { background: rgba(255, 255, 255, 0.02); }
  50% { background: rgba(248, 113, 113, 0.08); }
}

/* ========================================
   Module Completion Celebration
   ======================================== */
.completion-checkmark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: white;
  font-size: 0.875rem;
  animation: checkmark-appear 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes checkmark-appear {
  0% {
    transform: scale(0) rotate(-45deg);
    opacity: 0;
  }
  60% {
    transform: scale(1.2) rotate(5deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
}

.completion-celebration {
  animation: celebration-pulse 1s ease;
}

@keyframes celebration-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
  50% { box-shadow: 0 0 0 12px rgba(34, 197, 94, 0.15); }
}

/* ========================================
   Hero Section
   ======================================== */
.hero-gradient {
  background: radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 60%);
}

.hero-title {
  background: linear-gradient(135deg, #e0e7ff, #c7d2fe, #a5b4fc, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========================================
   Reset Button
   ======================================== */
.reset-btn {
  padding: 0.5rem 1.25rem;
  background: transparent;
  border: 1px solid #374151;
  border-radius: 8px;
  color: #6b7280;
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.reset-btn:hover {
  border-color: #ef4444;
  color: #ef4444;
  background: rgba(239, 68, 68, 0.08);
}

/* ========================================
   Module Page Layout
   ======================================== */
.module-content {
  max-width: 48rem;
  margin: 0 auto;
}

.module-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #f3f4f6;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #1f2937;
}

.module-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #e5e7eb;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.module-content p {
  color: #d1d5db;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.module-content ul,
.module-content ol {
  color: #d1d5db;
  line-height: 1.8;
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.module-content li {
  margin-bottom: 0.375rem;
}

.module-content strong {
  color: #f3f4f6;
  font-weight: 600;
}

.module-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid #1f2937;
}

.module-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 10px;
  color: #a5b4fc;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
}

.module-nav a:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

.mark-complete-btn {
  padding: 0.875rem 2rem;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: white;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mark-complete-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(34, 197, 94, 0.3);
}

.mark-complete-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* ========================================
   Callout / Tip Boxes
   ======================================== */
.callout {
  padding: 1.25rem 1.5rem;
  border-radius: 12px;
  margin: 1.5rem 0;
  border-left: 4px solid;
}

.callout-info {
  background: rgba(99, 102, 241, 0.08);
  border-color: #6366f1;
  color: #c7d2fe;
}

.callout-tip {
  background: rgba(34, 197, 94, 0.08);
  border-color: #22c55e;
  color: #bbf7d0;
}

.callout-warning {
  background: rgba(251, 191, 36, 0.08);
  border-color: #fbbf24;
  color: #fde68a;
}

.callout-title {
  font-weight: 700;
  margin-bottom: 0.375rem;
}

/* ========================================
   Tables
   ======================================== */
.module-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.9375rem;
}

.module-content th {
  background: rgba(99, 102, 241, 0.1);
  color: #c7d2fe;
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid #2d3748;
}

.module-content td {
  color: #d1d5db;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #1f2937;
}

.module-content tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 640px) {
  .quiz-wrapper {
    padding: 1.25rem;
  }

  .quiz-question {
    padding: 1rem;
  }

  .quiz-question-header {
    flex-direction: column;
    gap: 0.625rem;
  }

  .module-nav {
    flex-direction: column;
    gap: 1rem;
  }

  .module-nav a {
    width: 100%;
    justify-content: center;
  }

  pre[class*="language-"] {
    font-size: 0.8rem !important;
    padding: 1rem !important;
  }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
  nav,
  .quiz-actions,
  .reset-btn,
  .module-nav,
  .mark-complete-btn,
  .progress-bar-track {
    display: none !important;
  }

  body {
    background: white !important;
    color: #111 !important;
  }

  .module-content p,
  .module-content li,
  .module-content td {
    color: #333 !important;
  }

  .module-content h2,
  .module-content h3 {
    color: #111 !important;
  }

  pre[class*="language-"] {
    border: 1px solid #ccc !important;
    background: #f5f5f5 !important;
  }

  .quiz-question {
    break-inside: avoid;
  }
}

/* ========================================
   Scenario Engine - Alert
   ======================================== */
.scenario-alert {
  background: linear-gradient(145deg, #1a0f0f, #1f1418);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-left: 4px solid #ef4444;
  border-radius: 12px;
  padding: 1.5rem;
  animation: alert-pulse 2s ease-in-out;
}

.scenario-alert.severity-critical { border-left-color: #ef4444; box-shadow: 0 0 20px rgba(239, 68, 68, 0.1); }
.scenario-alert.severity-warning { border-left-color: #fbbf24; background: linear-gradient(145deg, #1a170f, #1f1c14); }
.scenario-alert.severity-emergency { border-left-color: #dc2626; box-shadow: 0 0 30px rgba(220, 38, 38, 0.15); }

@keyframes alert-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
  50% { box-shadow: 0 0 20px rgba(239, 68, 68, 0.15); }
}

/* ========================================
   Scenario Engine - Briefing
   ======================================== */
.scenario-briefing {
  background: linear-gradient(145deg, #111827, #0f1219);
  border: 1px solid #1f2937;
  border-left: 4px solid #f59e0b;
  border-radius: 12px;
  padding: 1.5rem;
}

/* ========================================
   Scenario Engine - Metric Panels
   ======================================== */
.metric-panel {
  background: linear-gradient(145deg, #111827, #0f1219);
  border: 1px solid #1f2937;
  border-radius: 12px;
  overflow: hidden;
}

.metric-panel-header {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #1f2937;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.metric-panel-body {
  padding: 1rem;
}

/* ========================================
   Scenario Engine - Log Terminal
   ======================================== */
.log-panel {
  background: #0d1117;
  border: 1px solid #21262d;
  border-radius: 12px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.8125rem;
  overflow: hidden;
}

.log-panel-header {
  background: #161b22;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid #21262d;
}

.log-panel-header .dot { width: 10px; height: 10px; border-radius: 50%; }
.log-panel-header .dot-red { background: #ff5f57; }
.log-panel-header .dot-yellow { background: #febc2e; }
.log-panel-header .dot-green { background: #28c840; }

.log-panel-body {
  max-height: 240px;
  overflow-y: auto;
  padding: 0.5rem 0;
}

.log-entry {
  padding: 0.25rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  white-space: nowrap;
  overflow-x: auto;
}

.log-level-error { color: #f87171; font-weight: 600; }
.log-level-warn { color: #fbbf24; font-weight: 600; }
.log-level-info { color: #60a5fa; }
.log-timestamp { color: #6b7280; margin-right: 0.5rem; }
.log-source { color: #a78bfa; margin-right: 0.5rem; }
.log-message { color: #d1d5db; }

/* ========================================
   Scenario Engine - Decision Cards
   ======================================== */
.decision-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid #2d3748;
  border-radius: 12px;
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.decision-card:hover {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.decision-card.selected { border-color: #6366f1; background: rgba(99, 102, 241, 0.12); }
.decision-card.optimal { border-color: rgba(34, 197, 94, 0.5); background: rgba(34, 197, 94, 0.08); }
.decision-card.deadend { border-color: rgba(239, 68, 68, 0.4); background: rgba(239, 68, 68, 0.06); }

/* ========================================
   Scenario Engine - Feedback
   ======================================== */
.scenario-feedback {
  padding: 1rem 1.25rem;
  border-radius: 10px;
  font-size: 0.9375rem;
  line-height: 1.6;
  animation: quiz-feedback-appear 0.4s ease;
}

.scenario-feedback .feedback-icon { margin-right: 0.375rem; }
.feedback-optimal { background: rgba(34, 197, 94, 0.1); border-left: 3px solid #22c55e; color: #bbf7d0; }
.feedback-suboptimal { background: rgba(251, 191, 36, 0.1); border-left: 3px solid #fbbf24; color: #fde68a; }
.feedback-deadend { background: rgba(239, 68, 68, 0.1); border-left: 3px solid #ef4444; color: #fecaca; }

/* ========================================
   Scenario Engine - Hint
   ======================================== */
.scenario-hint {
  padding: 1rem 1.25rem;
  background: rgba(245, 158, 11, 0.08);
  border-left: 3px solid #f59e0b;
  border-radius: 0 8px 8px 0;
  color: #fde68a;
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ========================================
   Scenario Engine - Dead End
   ======================================== */
.dead-end-panel {
  background: linear-gradient(145deg, #1a0f0f, #1f1418);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: 16px;
  padding: 2rem;
}

.learning-moment {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-top: 1rem;
}

/* ========================================
   Scenario Engine - Results & Grade
   ======================================== */
.scenario-results {
  background: linear-gradient(145deg, #111827, #0f1219);
  border: 1px solid #1f2937;
  border-radius: 16px;
  padding: 2rem;
}

.scenario-grade {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 800;
  margin: 0 auto 1rem;
  animation: checkmark-appear 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.grade-S { background: rgba(167, 139, 250, 0.15); color: #a78bfa; border: 2px solid rgba(167, 139, 250, 0.3); }
.grade-A { background: rgba(74, 222, 128, 0.15); color: #4ade80; border: 2px solid rgba(74, 222, 128, 0.3); }
.grade-B { background: rgba(251, 191, 36, 0.15); color: #fbbf24; border: 2px solid rgba(251, 191, 36, 0.3); }
.grade-C { background: rgba(248, 113, 113, 0.15); color: #f87171; border: 2px solid rgba(248, 113, 113, 0.3); }

/* ========================================
   Scenario Engine - Post-mortem Form
   ======================================== */
.postmortem-form {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid #1f2937;
  border-radius: 12px;
  padding: 1.5rem;
}

.postmortem-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid #2d3748;
  border-radius: 8px;
  color: #e5e7eb;
  font-size: 0.875rem;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}

.postmortem-textarea:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* ========================================
   Scenario Engine - Investigation Timeline (Sidebar)
   ======================================== */
.investigation-step {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.375rem 0;
  position: relative;
}

.investigation-step::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 1.75rem;
  bottom: -0.375rem;
  width: 2px;
  background: #1f2937;
}

.investigation-step:last-child::before { display: none; }

.investigation-step-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid #374151;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #111827;
}

.investigation-step.completed .investigation-step-dot { background: #6366f1; border-color: #6366f1; }
.investigation-step.current .investigation-step-dot { border-color: #f59e0b; box-shadow: 0 0 8px rgba(245, 158, 11, 0.3); }
.investigation-step.deadend .investigation-step-dot { background: rgba(239, 68, 68, 0.2); border-color: #ef4444; }

/* ========================================
   Lab Cards (Landing Page)
   ======================================== */
.lab-card {
  background: linear-gradient(145deg, #111827, #1a1f2e);
  border: 1px solid #1f2937;
  border-radius: 16px;
  padding: 1.75rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.lab-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #f59e0b, #d97706);
  opacity: 0;
  transition: opacity 0.3s;
}
.lab-card:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 158, 11, 0.3);
  box-shadow: 0 8px 30px rgba(245, 158, 11, 0.1);
}
.lab-card:hover::before {
  background: linear-gradient(90deg, #f59e0b, #d97706);
}

.lab-card.completed::before {
  background: linear-gradient(90deg, #22c55e, #16a34a);
}

.lab-number {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: white;
  flex-shrink: 0;
}

.lab-card.completed .lab-number {
  background: linear-gradient(135deg, #22c55e, #16a34a) !important;
}

.badge-grade {
  background: rgba(167, 139, 250, 0.15);
  color: #a78bfa;
  border: 1px solid rgba(167, 139, 250, 0.25);
}

/* ========================================
   Scenario Animation
   ======================================== */
.animate-fade-in {
  animation: scenario-fade-in 0.4s ease;
}

@keyframes scenario-fade-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ========================================
   Scenario Responsive - Mobile Enhancements
   ======================================== */

/* --- A. Sidebar Mobile Overlay --- */
@media (max-width: 1023px) {
  .sidebar-toggle-target {
    position: fixed;
    inset: 0;
    z-index: 60;
    width: 100% !important;
    max-width: none !important;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: none;
    overflow: hidden;
  }

  .sidebar-toggle-target.open {
    display: block;
  }

  .sidebar-toggle-target nav {
    position: relative;
    z-index: 1;
    width: 280px;
    height: 100%;
    min-height: 100vh;
    border-radius: 0;
    border-right: 1px solid #1f2937;
    background: #0a0a0f;
    overflow-y: auto;
  }
}

/* --- B. Touch Device Interactions --- */
@media (hover: none) and (pointer: coarse) {
  .decision-card {
    -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
  }

  .decision-card:hover {
    transform: none;
    box-shadow: none;
  }

  .decision-card:active {
    transform: scale(0.98);
    background: rgba(99, 102, 241, 0.15);
  }

  button:hover {
    transform: none;
  }

  button:active {
    transform: scale(0.98);
  }

  .lab-card:hover,
  .module-card:hover {
    transform: none;
  }
}

/* --- C. Scenario Tables Responsive --- */
.scenario-step table {
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* --- D. Mobile (max-width: 640px) --- */
@media (max-width: 640px) {
  /* Alert & Briefing */
  .scenario-alert {
    padding: 1rem;
    font-size: 0.875rem;
  }

  .scenario-alert h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
  }

  .scenario-briefing {
    padding: 1rem;
  }

  .scenario-briefing h3 {
    font-size: 1rem;
  }

  /* Decision Cards */
  .decision-card {
    padding: 1rem 1.25rem;
    min-height: 60px;
  }

  .decision-card span {
    font-size: 0.9375rem;
    line-height: 1.5;
  }

  /* Metric Panels & Charts */
  .metric-panel-header {
    padding: 0.625rem 0.875rem;
    font-size: 0.8125rem;
  }

  .metric-panel-body {
    padding: 0.875rem;
    min-height: 160px;
  }

  .metric-panel-body canvas {
    max-height: 160px !important;
  }

  /* Log Panel */
  .log-panel {
    font-size: 0.75rem;
  }

  .log-panel-body {
    max-height: 200px;
    padding: 0.375rem 0;
  }

  .log-entry {
    white-space: normal;
    word-break: break-word;
    padding: 0.375rem 0.75rem;
    font-size: 0.6875rem;
    line-height: 1.4;
  }

  .log-timestamp {
    display: none;
  }

  .log-source {
    margin-right: 0.375rem;
    font-size: 0.6875rem;
  }

  /* Investigation Timeline */
  .investigation-step {
    gap: 0.5rem;
    padding: 0.25rem 0;
  }

  .investigation-step::before {
    left: 9px;
    top: 1.5rem;
    width: 1.5px;
  }

  .investigation-step-dot {
    width: 20px;
    height: 20px;
    border-width: 1.5px;
  }

  .investigation-step-dot span {
    font-size: 0.625rem;
  }

  /* Tables */
  .scenario-step table {
    font-size: 0.8125rem;
  }

  .scenario-step th,
  .scenario-step td {
    padding: 0.5rem 0.75rem;
    white-space: nowrap;
  }

  .scenario-step thead th:first-child {
    position: sticky;
    left: 0;
    background: rgba(99, 102, 241, 0.15);
    z-index: 1;
  }

  .scenario-step tbody td:first-child {
    position: sticky;
    left: 0;
    background: #0a0a0f;
    z-index: 1;
  }

  /* Scenario Step Titles */
  .scenario-step h2 {
    font-size: 1.25rem;
  }

  .scenario-step h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
  }

  .scenario-step p {
    font-size: 0.9375rem;
    line-height: 1.6;
  }

  /* Results & Grade */
  .scenario-results {
    padding: 1.25rem;
  }

  .scenario-grade {
    width: 64px;
    height: 64px;
    font-size: 1.5rem;
  }

  .scenario-results h2 {
    font-size: 1.25rem;
  }

  .scenario-results h3 {
    font-size: 1.125rem;
  }

  /* Dead End */
  .dead-end-panel {
    padding: 1.25rem;
  }

  .dead-end-panel h2 {
    font-size: 1.25rem;
  }

  .learning-moment {
    padding: 1rem 1.125rem;
  }

  /* Feedback & Hint */
  .scenario-feedback {
    padding: 0.875rem 1rem;
    font-size: 0.875rem;
  }

  .scenario-hint {
    padding: 0.875rem 1rem;
    font-size: 0.8125rem;
  }

  /* Post-mortem Form */
  .postmortem-form {
    padding: 1rem;
  }

  .postmortem-form h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
  }

  .postmortem-textarea {
    padding: 0.625rem 0.875rem;
    font-size: 0.8125rem;
  }

  /* Grid Layouts - Force single column */
  .grid.sm\:grid-cols-2 {
    grid-template-columns: 1fr !important;
    gap: 0.875rem;
  }

  /* Buttons & Touch Targets */
  button,
  .decision-card {
    min-height: 44px;
  }

  header button.lg\:hidden {
    min-width: 44px;
    min-height: 44px;
  }
}

/* --- E. Tablet (641px ~ 1023px) --- */
@media (min-width: 641px) and (max-width: 1023px) {
  .metric-panel-body canvas {
    max-height: 180px !important;
  }

  .log-entry {
    font-size: 0.75rem;
    white-space: normal;
    word-break: break-word;
  }

  .log-timestamp {
    min-width: 60px;
  }
}

/* --- F. Accessibility --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: high) {
  .decision-card,
  .metric-panel,
  .log-panel {
    border-width: 2px;
  }
}

.decision-card:focus-visible,
button:focus-visible {
  outline: 2px solid #6366f1;
  outline-offset: 2px;
}