/* ═══════════════════════════════════════════════════════════════════════
   game-shell.css — Chassis CSS partagé entre toutes les démos IA
   ─────────────────────────────────────────────────────────────────────
   Chargé AVANT le CSS spécifique de chaque démo. Chaque démo définit
   ses propres --accent, --bg-*, --border-* dans son :root → la cascade
   override automatiquement les couleurs du shell.

   Composants exposés (utilisés dans 8+ démos) :
     .skip-link, .back-to-menu, .topbar (+ .brand, .tag)
     .neural-bg, .neural-overlay (fond décoratif animé)
     .layout, .panel (+ .p-title, .p-hint, .p-num, .p-privacy)
     .btn (+ .btn-primary, .btn-danger)
     .dropzone (+ .is-drag, .dropzone-hint, .dropzone-samples)
     .progress-row, .prog-item, .progress-bar (+ pulse)
     .controls-row, .mode-select, .topk-inline
     .preview-row, .preview-wrap, .preview-lbl

   Variables attendues du démo :root :
     --accent, --accent-deep, --accent-soft, --secondary, --success, --danger
     --bg-deep, --bg-elev, --bg-card, --border, --border-strong
     --text, --text-muted, --text-soft
     --radius, --radius-sm, --tween
   ═══════════════════════════════════════════════════════════════════════ */

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg-deep, #02040a); }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px; line-height: 1.55;
  color: var(--text, #e8edf5);
  background: transparent;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

/* ─── Accessibilité : skip link ────────────────────────────────────── */
.skip-link {
  position: absolute; left: -9999px; top: auto;
  width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus {
  position: fixed; left: 1rem; top: 1rem;
  width: auto; height: auto;
  background: var(--accent, #5dd4f7); color: var(--bg-deep, #04070f);
  padding: .6rem 1rem; border-radius: 8px;
  font-weight: 700; z-index: 100;
}

/* ─── Fond neural (canvas décoratif animé + grille dark overlay) ──── */
.neural-bg {
  position: fixed; inset: 0;
  width: 100vw; height: 100dvh;
  z-index: -2; pointer-events: none;
  display: block;
}
.neural-overlay {
  position: fixed; inset: 0;
  z-index: -1; pointer-events: none;
  background:
    repeating-linear-gradient(0deg, rgba(0,0,0,.10) 0 1px, transparent 1px 3px),
    radial-gradient(ellipse at center, transparent 25%, rgba(0,0,0,.55) 90%);
  mix-blend-mode: multiply;
}

/* ─── Bouton retour au menu (pin top-left) ─────────────────────────── */
.back-to-menu {
  position: fixed; top: 12px; left: 12px; z-index: 10;
  padding: .55rem .85rem; border-radius: 999px;
  background: var(--bg-card, rgba(10,18,36,.6));
  border: 1px solid var(--border, rgba(93,212,247,.16));
  color: var(--text-muted, #a3b0c5);
  text-decoration: none; font-weight: 600; font-size: .85rem;
  backdrop-filter: blur(10px);
  transition: background var(--tween, 200ms), color var(--tween, 200ms), border-color var(--tween, 200ms);
}
.back-to-menu:hover {
  color: var(--accent, #5dd4f7);
  border-color: var(--accent, #5dd4f7);
  background: var(--accent-soft, rgba(93,212,247,.10));
}

/* ─── Topbar (titre démo + tag) ─────────────────────────────────────── */
.topbar {
  display: flex; flex-wrap: wrap;
  align-items: center; justify-content: center;
  gap: .85rem; padding: 1.5rem 1rem .8rem;
  text-align: center;
}
.topbar .brand {
  font-size: 2rem; font-weight: 900; letter-spacing: .15em;
  background: linear-gradient(135deg, var(--accent, #5dd4f7), var(--secondary, #ff6ba8));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.topbar .tag {
  font-size: .7rem; font-family: ui-monospace, SFMono-Regular, monospace;
  color: var(--text-soft, #7d8aa1);
  letter-spacing: .14em; text-transform: uppercase;
  padding: .35rem .8rem;
  border: 1px solid var(--border, rgba(93,212,247,.16));
  border-radius: 999px;
  background: var(--bg-card, rgba(10,18,36,.6));
  backdrop-filter: blur(10px);
}

/* ─── Layout principal ──────────────────────────────────────────────── */
.layout {
  max-width: 1100px; margin: 0 auto; padding: 1rem;
  display: flex; flex-direction: column; gap: 1rem;
}

/* ─── Panels (bloc de contenu) ─────────────────────────────────────── */
.panel {
  background: var(--bg-card, rgba(10,18,36,.6));
  border: 1px solid var(--border, rgba(93,212,247,.16));
  border-radius: var(--radius, 14px);
  padding: 1.25rem;
  backdrop-filter: blur(12px);
  position: relative; overflow: hidden;
}
.panel.intro { border-left: 3px solid var(--accent, #5dd4f7); }

.p-title {
  margin: 0 0 .5rem;
  font-size: 1rem; font-weight: 700;
  color: var(--text, #e8edf5);
  display: flex; align-items: center; gap: .5rem;
}
.p-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 1.6rem; height: 1.6rem;
  border-radius: 6px;
  background: var(--accent-soft, rgba(93,212,247,.10));
  border: 1px solid var(--accent, #5dd4f7);
  color: var(--accent, #5dd4f7);
  font-family: ui-monospace, monospace; font-size: .85rem;
}
.p-hint {
  margin: .35rem 0 0;
  color: var(--text-muted, #a3b0c5);
  font-size: .9rem; line-height: 1.55;
}
.p-privacy {
  background: var(--accent-soft, rgba(93,212,247,.10));
  border-left: 3px solid var(--accent, #5dd4f7);
  padding: .6rem .8rem; border-radius: 6px;
  margin-top: .75rem; font-size: .85rem;
}

/* ─── Boutons ──────────────────────────────────────────────────────── */
.btn {
  padding: .7rem 1.1rem;
  border: 1px solid var(--border-strong, rgba(93,212,247,.32));
  border-radius: var(--radius-sm, 8px);
  background: var(--bg-elev, #08111e);
  color: var(--text, #e8edf5);
  cursor: pointer; font: inherit; font-weight: 600;
  display: inline-flex; align-items: center; gap: .4rem;
  text-decoration: none; min-height: 44px;
  transition: background var(--tween, 200ms), border-color var(--tween, 200ms), transform var(--tween, 200ms);
}
.btn:hover:not(:disabled) {
  background: var(--accent-soft, rgba(93,212,247,.10));
  border-color: var(--accent, #5dd4f7);
  color: var(--accent, #5dd4f7);
}
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn:focus-visible { outline: 2px solid var(--accent, #5dd4f7); outline-offset: 2px; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent, #5dd4f7), var(--accent-deep, #2a8bb5));
  border-color: transparent;
  color: #04070f; font-weight: 700;
}
.btn-primary:hover:not(:disabled) { filter: brightness(1.1); color: #04070f; }

.btn-danger {
  background: linear-gradient(135deg, var(--danger, #ff2a1a), #a01a10);
  border-color: transparent;
  color: #fff; font-weight: 700;
}

/* ─── Dropzone (upload drag & drop) ────────────────────────────────── */
.dropzone {
  border: 2px dashed var(--border-strong, rgba(93,212,247,.32));
  border-radius: var(--radius-sm, 8px);
  padding: 2rem 1rem; text-align: center;
  background: var(--bg-elev, #08111e);
  transition: background var(--tween, 200ms), border-color var(--tween, 200ms);
}
.dropzone.is-drag {
  background: var(--accent-soft, rgba(93,212,247,.10));
  border-color: var(--accent, #5dd4f7);
}
.dropzone-hint {
  margin: .75rem 0 .35rem;
  color: var(--text-muted, #a3b0c5); font-size: .85rem;
}
.dropzone-samples {
  margin: 0; font-size: .75rem;
  color: var(--text-soft, #7d8aa1);
}

/* ─── Progress (chargement modèles) ────────────────────────────────── */
.progress-row { display: flex; flex-direction: column; gap: .4rem; margin: .75rem 0; }
.prog-item {
  display: flex; align-items: center; gap: .5rem;
  padding: .4rem .6rem;
  background: var(--bg-elev, #08111e);
  border: 1px solid var(--border, rgba(93,212,247,.16));
  border-radius: 6px; font-size: .82rem;
}
.prog-item .pi-icon {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-soft, #7d8aa1); flex-shrink: 0;
}
.prog-item.is-active .pi-icon {
  background: var(--accent, #5dd4f7);
  animation: kr-pulse 1s ease-in-out infinite;
}
.prog-item.is-done  .pi-icon { background: var(--success, #39ff14); }
.prog-item.is-error .pi-icon { background: var(--danger, #ff2a1a); }
.pi-name   { flex: 1; color: var(--text-muted, #a3b0c5); }
.pi-status { font-family: ui-monospace, monospace; font-size: .72rem; color: var(--text-soft, #7d8aa1); }
@keyframes kr-pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }

.progress-bar {
  width: 100%; height: 6px;
  background: var(--bg-elev, #08111e);
  border-radius: 3px; overflow: hidden;
  margin-top: .5rem;
}
.progress-bar-fill {
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--accent, #5dd4f7), var(--secondary, #ff6ba8));
  border-radius: 3px; transition: width .3s;
}

/* ─── Controls (row de boutons/selects) ────────────────────────────── */
.controls-row {
  display: flex; flex-wrap: wrap;
  gap: .5rem; align-items: center;
  margin-top: .75rem;
}
.mode-select {
  background: var(--bg-elev, #08111e);
  color: var(--text, #e8edf5);
  border: 1px solid var(--border, rgba(93,212,247,.16));
  border-radius: var(--radius-sm, 8px);
  padding: .4rem .6rem;
  font: inherit; cursor: pointer;
}
.mode-select:focus-visible { outline: 2px solid var(--accent, #5dd4f7); outline-offset: 2px; }

.topk-inline {
  display: inline-flex; align-items: center;
  gap: .4rem; font-size: .85rem;
  color: var(--text-muted, #a3b0c5);
}

/* ─── Preview (aperçu upload / résultat) ───────────────────────────── */
.preview-row {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1rem; margin-top: 1rem;
}
.preview-wrap {
  background: var(--bg-elev, #08111e);
  border: 1px solid var(--border, rgba(93,212,247,.16));
  border-radius: var(--radius-sm, 8px);
  padding: .65rem; text-align: center;
}
.preview-lbl {
  margin: 0 0 .5rem; font-size: .75rem;
  color: var(--text-soft, #7d8aa1);
  text-transform: uppercase; letter-spacing: .05em;
}
.preview-wrap img {
  max-width: 100%; max-height: 200px;
  display: block; margin: 0 auto;
  border-radius: 4px;
}

/* ─── Global : [hidden] force override (spécificité UA) ────────────── */
[hidden] { display: none !important; }

/* ─── Responsive : dense sur mobile ────────────────────────────────── */
@media (max-width: 600px) {
  .layout { padding: .6rem; gap: .6rem; }
  .panel { padding: .85rem; }
  .preview-row { grid-template-columns: 1fr; }
  .topbar .brand { font-size: 1.5rem; }
  .topbar .tag { font-size: .6rem; }
}