/* ===== Layout ===== */
.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px 60px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.lead {
  text-align: center;
  color: var(--muted-color);
  font-size: 1rem;
  margin: -8px 0 0;
}

/* ===== Section header ===== */
.sec-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.sec-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0;
  color: #1a202c;
  text-shadow: none;
  text-align: left;
}

/* ===== Badges ===== */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 700;
  white-space: nowrap;
}

.frame-badge   { background: #ede9fe; color: #5b21b6; }
.fps-badge     { background: #fef3c7; color: #92400e; }
.compare-badge { background: #fee2e2; color: #991b1b; }
.try-badge     { background: #d1fae5; color: #065f46; }

/* ===== Concept text ===== */
.concept-desc {
  color: #374151;
  line-height: 1.75;
  margin-bottom: 8px;
}

.concept-note {
  background: #f0f9ff;
  border-left: 4px solid var(--brand);
  border-radius: 0 8px 8px 0;
  padding: 10px 14px;
  font-size: .9rem;
  color: #374151;
  margin-top: 14px;
  line-height: 1.6;
}

/* ===== Canvas ===== */
.canvas-wrap {
  margin: 12px 0 4px;
  display: flex;
  justify-content: center;
}

canvas {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
}

/* ===== Controls ===== */
.controls-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.ctrl-lbl {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .9rem;
  color: var(--muted-color);
}

.range-input {
  width: 180px;
  accent-color: var(--brand);
  cursor: pointer;
}

.action-btn {
  padding: 9px 20px;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: transform .1s, filter .15s;
}

.action-btn:active { transform: scale(.97); }

.frame-btn   { background: #7c3aed; color: #fff; }
.frame-btn:hover { filter: brightness(1.15); }
.compare-btn { background: #ef4444; color: #fff; }
.compare-btn:hover { filter: brightness(1.1); }
.reset-btn   { background: #e2e8f0; color: #475569; }
.reset-btn:hover { filter: brightness(.95); }

/* ===== FPS chart ===== */
.fps-chart {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 14px 0 4px;
}

.fps-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.fps-label {
  width: 58px;
  font-size: .78rem;
  font-weight: 700;
  color: #6b7280;
  text-align: right;
  flex-shrink: 0;
}

.fps-bar-wrap {
  flex: 1;
  background: #f1f5f9;
  border-radius: 6px;
  height: 32px;
  overflow: hidden;
}

.fps-bar {
  height: 100%;
  background: #a5b4fc;
  border-radius: 6px;
  display: flex;
  align-items: center;
  padding-left: 8px;
  font-size: .75rem;
  font-weight: 600;
  color: #3730a3;
  transition: width .3s;
  min-width: 44px;
}

.fps-row-highlight .fps-bar {
  background: #6366f1;
  color: #fff;
}

/* ===== Compare grid ===== */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0 4px;
}

.compare-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
}

.compare-label {
  font-size: .85rem;
  font-weight: 700;
  padding: 2px 12px;
  border-radius: 999px;
}

.fps-low-label  { background: #fee2e2; color: #991b1b; }
.fps-high-label { background: #d1fae5; color: #065f46; }

.compare-cell canvas {
  width: 100%;
}

/* ===== FPS display ===== */
.fps-display {
  text-align: center;
  font-size: 2rem;
  font-weight: 800;
  color: var(--brand);
  letter-spacing: .03em;
  margin: 12px 0 4px;
}

.fps-tag {
  padding: 4px 14px;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 700;
  background: #d1fae5;
  color: #065f46;
}

/* ===== FPS meter ===== */
.fps-meter {
  margin-top: 8px;
  height: 10px;
  background: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}

.fps-meter-fill {
  height: 100%;
  background: linear-gradient(90deg, #ef4444, #f59e0b, #22c55e);
  border-radius: 999px;
  transition: width .15s;
}

.fps-meter-labels {
  display: flex;
  justify-content: space-between;
  font-size: .72rem;
  color: #9ca3af;
  margin-top: 2px;
}

/* ===== Mobile ===== */
@media (max-width: 480px) {
  .compare-grid { grid-template-columns: 1fr; }
  .compare-cell canvas { max-width: 300px; }
  .fps-row .fps-label { width: 46px; }
}