/* ============================================================
   1. DESIGN TOKENS
   ============================================================ */
:root {
  --kk3-bg:         #0b0d16;
  --kk3-surface:    #131726;
  --kk3-surface2:   #1b2036;
  --kk3-border:     rgba(255,255,255,.10);
  --kk3-text:       #e7e9f5;
  --kk3-muted:      rgba(231,233,245,.58);
  --kk3-accent:     #7c9cff;
  --kk3-accent2:    #4fd1c5;
  --kk3-danger:     #ff8a65;
  --kk3-radius:     12px;
  --kk3-shadow:     0 8px 32px rgba(0,0,0,.45);
  --kk3-transition: 0.2s ease;
}

/* ============================================================
   2. THÈME CLAIR
   ============================================================ */
[data-theme="light"] {
  --kk3-bg:       #f6f7fb;
  --kk3-surface:  #ffffff;
  --kk3-surface2: #eef0f9;
  --kk3-border:   rgba(20,20,40,.12);
  --kk3-text:     #191b28;
  --kk3-muted:    rgba(25,27,40,.6);
  --kk3-shadow:   0 8px 32px rgba(30,30,60,.10);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --kk3-bg:       #f6f7fb;
    --kk3-surface:  #ffffff;
    --kk3-surface2: #eef0f9;
    --kk3-border:   rgba(20,20,40,.12);
    --kk3-text:     #191b28;
    --kk3-muted:    rgba(25,27,40,.6);
    --kk3-shadow:   0 8px 32px rgba(30,30,60,.10);
  }
}

/* ============================================================
   3. LAYOUT APP PRINCIPAL
   ============================================================ */
#kk3-app {
  max-width: 1140px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  color: var(--kk3-text);
  font-family: 'Source Sans 3', system-ui, sans-serif;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ============================================================
   4. HEADER
   ============================================================ */
.kk3-header {
  text-align: center;
  padding: 0.5rem 0 0.25rem;
}

.kk3-header h1 {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
  background: linear-gradient(135deg, var(--kk3-accent) 0%, var(--kk3-accent2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.kk3-subtitle {
  color: var(--kk3-muted);
  max-width: 760px;
  margin: 0 auto;
  line-height: 1.65;
}

.kk3-subtitle strong { color: var(--kk3-text); }

/* ============================================================
   5. CONTRÔLES
   ============================================================ */
.kk3-controls {
  background: var(--kk3-surface);
  border: 1px solid var(--kk3-border);
  border-radius: var(--kk3-radius);
  box-shadow: var(--kk3-shadow);
  padding: 1.1rem 1.3rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.kk3-param {
  flex: 1 1 320px;
  min-width: 260px;
}

.kk3-param label {
  display: block;
  font-size: 0.85rem;
  color: var(--kk3-muted);
  margin-bottom: 0.4rem;
}

.kk3-range-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.kk3-range-row input[type="range"] {
  flex: 1 1 auto;
  accent-color: var(--kk3-accent);
  height: 6px;
}

.kk3-value {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  min-width: 1.6em;
  text-align: center;
  color: var(--kk3-accent);
}

.kk3-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ============================================================
   6. STATS
   ============================================================ */
.kk3-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.stat-item {
  background: var(--kk3-surface);
  border: 1px solid var(--kk3-border);
  border-left: 3px solid var(--c, var(--kk3-accent));
  border-radius: var(--kk3-radius);
  padding: 0.75rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--kk3-muted);
  line-height: 1.3;
}

.stat-value {
  font-size: 1.3rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--kk3-text);
}

.kk3-status-live {
  min-height: 1.2em;
  text-align: center;
  font-size: 0.9rem;
  color: var(--kk3-accent2);
}

/* ============================================================
   7. PANELS (canvas 2D / 3D)
   ============================================================ */
.kk3-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.kk3-panel {
  background: var(--kk3-surface);
  border: 1px solid var(--kk3-border);
  border-radius: var(--kk3-radius);
  box-shadow: var(--kk3-shadow);
  padding: 1.1rem 1.2rem 1.3rem;
  display: flex;
  flex-direction: column;
}

.kk3-panel h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  color: var(--kk3-text);
}

.kk3-panel-hint {
  font-size: 0.85rem;
  color: var(--kk3-muted);
  line-height: 1.55;
  margin: 0 0 0.8rem;
}

.kk3-panel canvas {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  background: var(--kk3-surface2);
  border-radius: 8px;
  border: 1px solid var(--kk3-border);
  display: block;
  touch-action: none;
  cursor: grab;
}

#canvas-3d { cursor: grab; }
#canvas-3d.grabbing { cursor: grabbing; }
#canvas-2d { cursor: default; }

/* ============================================================
   8. CHART PANEL
   ============================================================ */
.kk3-chart-panel canvas {
  aspect-ratio: 4.5 / 1;
}

/* ============================================================
   9. EXPLICATIONS (accordéon)
   ============================================================ */
.kk3-explainer {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.kk3-explainer details {
  background: var(--kk3-surface);
  border: 1px solid var(--kk3-border);
  border-radius: var(--kk3-radius);
  padding: 0.9rem 1.1rem;
}

.kk3-explainer summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.kk3-explainer summary::-webkit-details-marker { display: none; }

.kk3-explainer summary::before {
  content: "▸";
  color: var(--kk3-accent);
  transition: transform var(--kk3-transition);
  flex: none;
}

.kk3-explainer details[open] summary::before {
  transform: rotate(90deg);
}

.explainer-body {
  margin-top: 0.7rem;
  color: var(--kk3-muted);
  line-height: 1.65;
  font-size: 0.95rem;
}

.explainer-body p + p { margin-top: 0.7rem; }
.explainer-body strong { color: var(--kk3-text); }
.explainer-body sup { color: var(--kk3-accent2); }

/* ============================================================
   10. COMPOSANTS GÉNÉRIQUES (boutons)
   ============================================================ */
.btn-primary, .btn-secondary {
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--kk3-transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--kk3-accent), var(--kk3-accent2));
  color: #0b0d16;
}

.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; filter: none; }

.btn-primary[aria-pressed="true"] {
  background: var(--kk3-danger);
  animation: kk3-pulse 1.4s ease-in-out infinite;
}

@keyframes kk3-pulse {
  0%, 100% { filter: brightness(1); }
  50%      { filter: brightness(1.25); }
}

.btn-secondary {
  background: var(--kk3-surface2);
  color: var(--kk3-text);
  border-color: var(--kk3-border);
}

.btn-secondary:hover { border-color: var(--kk3-accent); }

.btn-secondary[aria-pressed="true"] {
  background: var(--kk3-accent);
  color: #0b0d16;
  border-color: var(--kk3-accent);
}

/* ============================================================
   11. ÉTATS
   ============================================================ */
.kk3-panel.is-computing canvas { opacity: 0.55; }

/* ============================================================
   12. ACCESSIBILITÉ
   ============================================================ */
:focus-visible { outline: 2px solid var(--kk3-accent); outline-offset: 2px; }

/* ============================================================
   13. RESPONSIVE
   ============================================================ */
@media (max-width: 800px) {
  .kk3-panels { grid-template-columns: 1fr; }
  .kk3-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  #kk3-app { padding: 1rem 0.75rem 2.5rem; }
  .kk3-controls { flex-direction: column; align-items: stretch; }
  .kk3-actions { justify-content: stretch; }
  .kk3-actions button { flex: 1 1 auto; }
  .kk3-stats { grid-template-columns: 1fr 1fr; }
}