/* ============================================
   NIVEAU 28 — LA PERFORMANCE CSS
   Styles spécifiques au chapitre
   ============================================ */

/* ---------- PERFORMANCE MEASUREMENT ---------- */
.perf-metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.perf-metric-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1.25rem;
  text-align: center;
}

.perf-metric-card .metric-value {
  font-size: 2rem;
  font-weight: 700;
  color: #2563eb;
  margin-bottom: 0.25rem;
}

.perf-metric-card .metric-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.perf-metric-card .metric-desc {
  font-size: 0.8rem;
  color: #94a3b8;
  margin-top: 0.5rem;
}

/* ---------- SELECTOR PERFORMANCE ---------- */
.selector-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

@media (max-width: 700px) {
  .selector-comparison { grid-template-columns: 1fr; }
}

.selector-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1.25rem;
}

.selector-box h4 {
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.selector-box.bad { border-color: #fca5a5; background: #fef2f2; }
.selector-box.good { border-color: #86efac; background: #f0fdf4; }

/* ---------- LAYOUT THRASHING DEMO ---------- */
.layout-demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.layout-card {
  border-radius: 8px;
  padding: 1.25rem;
  text-align: center;
}

.layout-card.composite {
  background: #f0fdf4;
  border: 2px solid #16a34a;
}

.layout-card.paint {
  background: #fef9c3;
  border: 2px solid #ca8a04;
}

.layout-card.layout {
  background: #fef2f2;
  border: 2px solid #dc2626;
}

.layout-card .badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.layout-card.composite .badge { background: #dcfce7; color: #16a34a; }
.layout-card.paint .badge { background: #fef9c3; color: #ca8a04; }
.layout-card.layout .badge { background: #fef2f2; color: #dc2626; }

/* ---------- ANIMATION PERFORMANCE ---------- */
.perf-anim-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.perf-anim-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1.5rem;
}

.perf-anim-track {
  height: 40px;
  background: #e2e8f0;
  border-radius: 6px;
  overflow: hidden;
  position: relative;
  margin-top: 0.75rem;
}

.perf-anim-ball {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  position: absolute;
  top: 5px;
  left: 5px;
}

.perf-anim-card.bad .perf-anim-ball {
  animation: perf-bad-move 2s ease-in-out infinite;
}

.perf-anim-card.good .perf-anim-ball {
  animation: perf-good-move 2s ease-in-out infinite;
}

@keyframes perf-bad-move {
  0%, 100% { left: 5px; width: 30px; }
  50% { left: calc(100% - 35px); width: 30px; }
}

@keyframes perf-good-move {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(200px); }
}

/* ---------- BEFORE/AFTER COMPARISON ---------- */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

@media (max-width: 700px) {
  .comparison-grid { grid-template-columns: 1fr; }
}

.comparison-box {
  border-radius: 8px;
  padding: 1.25rem;
}

.comparison-box.before {
  background: #fef2f2;
  border: 1px solid #fca5a5;
}

.comparison-box.after {
  background: #f0fdf4;
  border: 1px solid #86efac;
}

.comparison-box h4 {
  margin-bottom: 0.75rem;
}

.comparison-box pre {
  margin: 0;
  font-size: 0.8rem;
}

/* ---------- CRITICAL CSS DEMO ---------- */
.critical-css-demo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

@media (max-width: 700px) {
  .critical-css-demo { grid-template-columns: 1fr; }
}

.critical-box {
  border-radius: 8px;
  padding: 1.25rem;
}

.critical-box.critical {
  background: #eff6ff;
  border: 1px solid #93c5fd;
}

.critical-box.non-critical {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
}

/* ---------- FONT LOADING DEMO ---------- */
.font-loading-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.font-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1.25rem;
  text-align: center;
}

.font-card .font-swatch {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  padding: 0.75rem;
  background: white;
  border-radius: 6px;
  border: 1px solid #e2e8f0;
}

.font-card .font-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: #64748b;
}

/* ---------- CHECKLIST ---------- */
.checklist {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1rem;
}

.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  font-size: 0.9rem;
}

.checklist li::before {
  content: "✓";
  color: #16a34a;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ---------- CONTAINMENT DEMO ---------- */
.contain-demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.contain-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1.25rem;
  contain: layout style;
}

.contain-card h4 {
  margin-bottom: 0.5rem;
}

/* ---------- CLS DEMO ---------- */
.cls-demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

@media (max-width: 700px) {
  .cls-demo-grid { grid-template-columns: 1fr; }
}

.cls-box {
  border-radius: 8px;
  padding: 1.25rem;
  text-align: center;
}

.cls-box.bad { background: #fef2f2; border: 1px solid #fca5a5; }
.cls-box.good { background: #f0fdf4; border: 1px solid #86efac; }

.cls-img-bad {
  width: 100%;
  background: #e2e8f0;
}

.cls-img-good {
  width: 100%;
  aspect-ratio: 16/9;
  background: #e2e8f0;
  object-fit: cover;
}

/* ---------- LOADING STRATEGIES ---------- */
.loading-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.loading-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1.25rem;
}

.loading-card h4 {
  font-family: 'Cascadia Code', 'Fira Code', monospace;
  font-size: 0.85rem;
  color: #2563eb;
  margin-bottom: 0.5rem;
}

.loading-card p {
  font-size: 0.85rem;
  color: #64748b;
  margin: 0;
}