:root {
  --bg: #f3f6fb;
  --panel: rgba(255, 255, 255, 0.92);
  --panel-border: rgba(15, 23, 42, 0.08);
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --soft: #dbeafe;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: "Inter", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(59,130,246,0.08), transparent 28%),
    linear-gradient(180deg, #f8fbff 0%, #eef3f9 100%);
}
body { min-height: 100vh; }

.app-shell {
  display: grid;
  grid-template-columns: minmax(320px, 390px) minmax(0, 1fr);
  gap: 24px;
  padding: 24px;
  min-height: 100vh;
  align-items: start;
}

.sidebar {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 20px;
  backdrop-filter: blur(10px);
  position: sticky;
  top: 24px;
  max-height: calc(100vh - 48px);
  overflow: auto;
}

.brand-card,
.panel,
.workspace-topbar,
.canvas-wrapper {
  background: rgba(255,255,255,0.88);
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: var(--shadow);
}

.brand-card {
  display: flex;
  gap: 14px;
  align-items: center;
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 18px;
  background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
}
.brand-badge {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #2563eb 0%, #1e3a8a 100%);
  color: white;
  font-weight: 800;
}
.brand-card h1 { margin: 0; font-size: 1.08rem; }
.brand-card p { margin: 4px 0 0; color: var(--muted); font-size: 0.92rem; line-height: 1.45; }

.panel {
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
}
.panel h2 { margin: 0 0 14px; font-size: 1rem; }

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}
.field.inline {
  flex-direction: row;
  align-items: center;
  gap: 10px;
}
.field span {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

input[type="text"],
input[type="number"],
input[type="file"],
select,
input[type="range"] {
  width: 100%;
}

input[type="text"],
input[type="number"],
input[type="file"],
select {
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: #fff;
  color: var(--text);
  border-radius: 12px;
  padding: 12px 13px;
  font: inherit;
  outline: none;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="file"]:focus,
select:focus {
  border-color: rgba(37, 99, 235, 0.45);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.button-row,
.tool-row,
.status-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  background: #e2e8f0;
  color: #0f172a;
  text-decoration: none;
  transition: 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: #f8fafc; border: 1px solid rgba(15, 23, 42, 0.08); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: var(--danger-hover); }
.btn-link { text-decoration: none; }
.tool-btn.is-active { outline: 3px solid rgba(37, 99, 235, 0.16); }

.helper-text {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.tileset-preview-wrap {
  margin-top: 12px;
  border-radius: 14px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: #f8fafc;
  padding: 12px;
}
.tileset-info {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.9rem;
}
.tiles-palette {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(68px, 1fr));
  gap: 8px;
  max-height: 340px;
  overflow: auto;
}
.tile-swatch {
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: white;
  border-radius: 12px;
  padding: 6px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: 0.2s ease;
}
.tile-swatch:hover { transform: translateY(-1px); }
.tile-swatch.is-selected {
  border-color: rgba(37, 99, 235, 0.65);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.tile-swatch canvas {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  background: linear-gradient(45deg, #f8fafc 25%, #eef2f7 25%, #eef2f7 50%, #f8fafc 50%, #f8fafc 75%, #eef2f7 75%, #eef2f7 100%);
  background-size: 12px 12px;
  border-radius: 8px;
}
.tile-swatch small {
  font-size: 0.73rem;
  color: var(--muted);
  text-align: center;
}

.selected-tile-card {
  border: 1px dashed rgba(15, 23, 42, 0.14);
  border-radius: 14px;
  padding: 12px;
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 12px;
  background: #f8fafc;
}
.selected-tile-card.empty {
  color: var(--muted);
}
.selected-tile-card canvas {
  width: 54px;
  height: 54px;
  border-radius: 10px;
  border: 1px solid rgba(15, 23, 42, 0.1);
  background: white;
}
.selected-tile-card strong,
.selected-tile-card span {
  display: block;
}
.selected-tile-card span {
  color: var(--muted);
  font-size: 0.85rem;
}

.layers-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.layer-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  background: #f8fafc;
  border: 1px solid rgba(15, 23, 42, 0.06);
  cursor: pointer;
}
.layer-item.is-active {
  border-color: rgba(37, 99, 235, 0.28);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.08);
}
.layer-item strong { display: block; font-size: 0.95rem; }
.layer-item small { color: var(--muted); }
.layer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.layer-tag {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--soft);
  color: #1e3a8a;
  font-size: 0.78rem;
  font-weight: 800;
}

.selection-empty { color: var(--muted); }
.selection-editor.hidden,
.hidden { display: none; }

.workspace {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}
.workspace-topbar {
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  backdrop-filter: blur(8px);
}
.workspace-topbar h2 { margin: 0; font-size: 1.2rem; }
.workspace-topbar p { margin: 6px 0 0; color: var(--muted); }
.status-pill {
  padding: 10px 12px;
  border-radius: 999px;
  background: #eff6ff;
  color: #1e3a8a;
  font-weight: 700;
  font-size: 0.85rem;
}

.canvas-wrapper {
  border-radius: var(--radius-lg);
  padding: 18px;
  min-height: clamp(420px, 76vh, 980px);
  overflow: auto;
}
#stageContainer {
  width: 100%;
  min-height: clamp(380px, 72vh, 920px);
  border-radius: 20px;
  overflow: auto;
  background:
    linear-gradient(180deg, rgba(248,250,252,0.96), rgba(241,245,249,0.96));
  border: 1px solid rgba(15, 23, 42, 0.06);
}
#stageContainer canvas { display: block; max-width: none; }

@media (max-width: 1180px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; max-height: none; }
  .workspace-topbar { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 720px) {
  .app-shell { padding: 14px; gap: 14px; }
  .sidebar, .workspace-topbar, .canvas-wrapper { border-radius: 18px; }
  .button-row, .tool-row, .status-pills, .grid-2 { grid-template-columns: 1fr; flex-direction: column; }
  .btn { width: 100%; }
}
.btn-retour {
  position: fixed;
  top: 15px;
  left: 15px;
  padding: 10px 14px;
  background: #222;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  z-index: 9999;
}