/* ==========================================================================
   Chipik Quiz Design System (Vanilla CSS)
   ========================================================================== */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  /* Primary & Slate Palette */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;

  /* Accent Blue */
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;

  /* Semantic Feedback Colors */
  --green-50: #ecfdf5;
  --green-100: #d1fae5;
  --green-600: #059669;
  --green-700: #047857;
  --green-border: #10b981;

  --red-50: #fef2f2;
  --red-100: #fee2e2;
  --red-600: #dc2626;
  --red-700: #b91c1c;
  --red-border: #ef4444;

  --amber-50: #fffbeb;
  --amber-100: #fef3c7;
  --amber-600: #d97706;
  --amber-700: #b45309;

  /* Shadows & Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--slate-100);
  color: var(--slate-800);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Layout Elements */
.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--slate-200);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0.875rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--slate-900);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand-badge {
  background-color: var(--blue-50);
  color: var(--blue-600);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--blue-100);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-link {
  color: var(--slate-600);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  transition: color 0.15s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--blue-600);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
}

.user-name {
  font-weight: 600;
  color: var(--slate-700);
}

.btn-logout {
  background: none;
  border: none;
  color: var(--slate-500);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.btn-logout:hover {
  color: var(--red-600);
  background-color: var(--red-50);
}

/* Main Container */
.main-content {
  flex: 1;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

/* Cards & Surfaces */
.card {
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--slate-900);
  margin-bottom: 0.35rem;
  letter-spacing: -0.01em;
}

.card-subtitle {
  font-size: 0.875rem;
  color: var(--slate-500);
  margin-bottom: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn-primary {
  background-color: var(--blue-600);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--blue-700);
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--slate-700);
  border-color: var(--slate-300);
}

.btn-secondary:hover {
  background-color: var(--slate-50);
  border-color: var(--slate-400);
}

.btn-success {
  background-color: var(--green-600);
  color: #ffffff;
}

.btn-success:hover {
  background-color: var(--green-700);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-block {
  width: 100%;
}

/* Stat Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-box {
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.stat-label {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate-500);
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--slate-900);
  margin-top: 0.25rem;
}

/* Badges */
.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.badge-pending {
  background-color: var(--amber-50);
  color: var(--amber-700);
  border: 1px solid var(--amber-100);
}

.badge-completed {
  background-color: var(--green-50);
  color: var(--green-700);
  border: 1px solid var(--green-100);
}

/* Quiz Player Layout */
.quiz-player-container {
  max-width: 760px;
  margin: 0 auto;
}

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

.progress-track {
  width: 100%;
  height: 8px;
  background-color: var(--slate-200);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.progress-fill {
  height: 100%;
  background-color: var(--blue-600);
  width: 0%;
  transition: width 0.3s ease;
}

.question-card {
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.question-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.question-category {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--blue-600);
  background-color: var(--blue-50);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
}

.question-weight {
  font-size: 0.8125rem;
  color: var(--slate-500);
  font-weight: 500;
}

.question-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--slate-900);
  line-height: 1.4;
  margin-bottom: 1.25rem;
}

/* Media Containers */
.question-media {
  margin-bottom: 1.5rem;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.question-image {
  max-width: 100%;
  max-height: 380px;
  width: auto;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
  margin: 0 auto;
  border: 1px solid var(--slate-200);
}

.question-audio {
  width: 100%;
  margin-top: 0.5rem;
}

.question-video {
  width: 100%;
  max-height: 400px;
  border-radius: var(--radius-md);
}

.video-embed-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.video-embed-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Answer Choices */
.answers-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.answer-item {
  display: flex;
  align-items: center;
  padding: 1rem 1.25rem;
  background-color: #ffffff;
  border: 2px solid var(--slate-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.answer-item:hover:not(.locked) {
  border-color: var(--blue-600);
  background-color: var(--blue-50);
}

.answer-item.selected:not(.locked) {
  border-color: var(--blue-600);
  background-color: var(--blue-50);
}

.answer-item input[type="radio"],
.answer-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-right: 1rem;
  accent-color: var(--blue-600);
  cursor: pointer;
}

.answer-text {
  font-size: 1rem;
  font-weight: 500;
  color: var(--slate-800);
  flex: 1;
}

/* Client-Side Feedback Highlighting */
.answer-item.feedback-correct {
  background-color: var(--green-50) !important;
  border-color: var(--green-border) !important;
  color: var(--green-700);
}

.answer-item.feedback-incorrect {
  background-color: var(--red-50) !important;
  border-color: var(--red-border) !important;
  color: var(--red-700);
}

.answer-item.locked {
  cursor: default;
}

/* Explanation Box */
.explanation-box {
  background-color: var(--slate-50);
  border-left: 4px solid var(--blue-600);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  animation: fadeIn 0.25s ease-in-out;
}

.explanation-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--slate-900);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.explanation-text {
  font-size: 0.9375rem;
  color: var(--slate-700);
  line-height: 1.5;
}

/* Results & Breakdown */
.score-hero {
  text-align: center;
  padding: 2.5rem 1.5rem;
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-xl);
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.score-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.score-badge.high {
  background-color: var(--green-50);
  color: var(--green-600);
  border: 4px solid var(--green-100);
}

.score-badge.medium {
  background-color: var(--amber-50);
  color: var(--amber-600);
  border: 4px solid var(--amber-100);
}

.score-badge.low {
  background-color: var(--red-50);
  color: var(--red-600);
  border: 4px solid var(--red-100);
}

.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.breakdown-table th,
.breakdown-table td {
  padding: 0.875rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--slate-200);
}

.breakdown-table th {
  background-color: var(--slate-50);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--slate-600);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .header-inner {
    padding: 0.75rem 1rem;
  }
  .main-content {
    padding: 1rem 0.75rem 2rem;
  }
  .question-card {
    padding: 1.25rem;
  }
  .question-text {
    font-size: 1.1rem;
  }
}

/* Feedback / Report Question Modal */
.report-question-btn {
  background: transparent;
  border: 1px solid var(--slate-200);
  color: var(--slate-500);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
}

.report-question-btn:hover {
  background: var(--red-50);
  border-color: #fecaca;
  color: var(--red-600);
}

.feedback-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.2s ease;
}

.feedback-modal-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 480px;
  overflow: hidden;
  border: 1px solid var(--slate-200);
}

.feedback-modal-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--slate-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--slate-50);
}

.feedback-close-btn {
  background: none;
  border: none;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--slate-400);
  cursor: pointer;
  padding: 0.25rem;
  transition: color 0.15s;
}

.feedback-close-btn:hover {
  color: var(--slate-800);
}

.feedback-modal-body {
  padding: 1.25rem;
}

.feedback-modal-footer {
  padding: 0.875rem 1.25rem;
  background: var(--slate-50);
  border-top: 1px solid var(--slate-200);
  display: flex;
  justify-content: flex-end;
  gap: 0.625rem;
}