/* =============================================================
   POCHOLA — Layout compartido (header / panel / btn / toast / scrollbar)
   =============================================================
   Extraído de tramado.html y apps/nesting/index.html (duplicado histórico).
   Antes cada app copiaba estos bloques enteros; ahora viven acá una sola
   vez y ambas apps importan este archivo después de tokens.css.

   Qué contiene: scrollbar personalizado, header completo (.app-header,
   .header-brand, .logo-wrap, .brand-*, .header-center, .engine-status,
   .header-actions, .icon-btn, .lang-switch), layout principal (.app-main,
   .sidebar, .center-area), panel (.panel, .panel-header, .panel-title,
   .panel-badge, .panel-subtitle), botones (.btn y variantes) y toast
   (.toast-container, .toast). Lo específico de cada app (canvas-stage,
   roll-viewport, etc.) se queda en su propio <style>.

   Importar después de tokens.css:
     <link rel="stylesheet" href="./shared/theme/tokens.css">
     <link rel="stylesheet" href="./shared/theme/layout.css">
   ============================================================= */

/* ---------- Background gradient + grid overlay ---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(255, 138, 61, 0.08), transparent 60%),
    radial-gradient(ellipse 70% 50% at 100% 100%, rgba(77, 171, 247, 0.06), transparent 60%),
    linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 100%);
  z-index: -2;
  pointer-events: none;
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(var(--overlay-rgb),0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--overlay-rgb),0.015) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -1;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

/* ---------- Scrollbar personalizado ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(var(--overlay-rgb),0.08);
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: rgba(var(--overlay-rgb),0.15); background-clip: padding-box; }

/* ---------- Header ---------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 24px;
  background: rgba(10, 14, 26, 0.94);
  border-bottom: 1px solid var(--border);
}
html[data-theme="light"] .app-header { background: rgba(255, 255, 255, 0.75); }
html[data-theme="light"] body::before { opacity: 0.5; }

.header-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  text-decoration: none;
  color: inherit;
}
.logo-wrap {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(255,138,61,0.15), rgba(255,179,71,0.05));
  border: 1px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  transition: transform var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease);
}
.logo-wrap:hover { transform: scale(1.05) rotate(-2deg); box-shadow: var(--shadow-glow); }
.logo-wrap img { width: 100%; height: 100%; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-title {
  font-size: 17px; font-weight: 700; letter-spacing: -0.01em;
  background: linear-gradient(135deg, var(--text-0) 0%, #ffb347 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand-sub { font-size: 11px; color: var(--text-3); font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; }
.header-center { flex: 1; display: flex; justify-content: center; gap: 8px; min-height: 36px; align-items: center; contain: layout; }
.engine-status {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-width: 208px; padding: 8px 16px; border-radius: 100px;
  background: rgba(var(--overlay-rgb),0.04);
  border: 1px solid var(--border);
  font-size: 12px; font-weight: 500; color: var(--text-2);
  transition: all var(--t-med) var(--ease);
  contain: layout;
}
.engine-status .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-3); box-shadow: 0 0 0 0 rgba(var(--overlay-rgb),0.4); transition: all var(--t-med) var(--ease); }
.engine-status.loading .dot { background: var(--accent); animation: pulse 1.2s infinite; }
.engine-status.ready .dot { background: var(--success); box-shadow: 0 0 10px var(--success); }
.engine-status.error .dot { background: var(--danger); }
@keyframes pulse { 0%,100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.4); opacity: 0.5; } }
.header-actions { display: flex; gap: 10px; align-items: center; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 10px;
  background: rgba(var(--overlay-rgb),0.04);
  border: 1px solid var(--border);
  color: var(--text-2);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--t-fast) var(--ease);
}
.icon-btn:hover { background: var(--surface-hover); color: var(--text-0); transform: translateY(-1px); }
.icon-btn svg { width: 18px; height: 18px; }
.lang-switch { position: relative; }
.lang-switch .icon-btn { width: auto; padding: 0 10px; gap: 6px; font-size: 12px; font-weight: 700; }
.lang-switch .icon-btn svg { width: 16px; height: 16px; }
.lang-menu { display: none; position: absolute; right: 0; top: calc(100% + 6px); background: var(--surface-solid); border: 1px solid var(--border-strong); border-radius: 10px; padding: 4px; min-width: 150px; z-index: 200; box-shadow: 0 8px 24px rgba(0,0,0,0.25); }
.lang-menu.visible { display: block; }
.lang-opt { display: flex; align-items: center; gap: 8px; width: 100%; padding: 8px 10px; background: none; border: none; border-radius: 7px; color: var(--text-1); font-size: 13px; text-align: left; cursor: pointer; }
.lang-opt:hover { background: var(--surface-hover); color: var(--text-0); }
.lang-opt.active { color: var(--accent, #ff8a3d); font-weight: 700; }

/* ---------- Layout principal (3 columnas) ---------- */
.app-main {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--sidebar-w);
  gap: 20px;
  padding: 16px 20px;
  height: calc(100vh - var(--header-h));
  height: calc(100dvh - var(--header-h));
  max-width: 1800px;
  margin: 0 auto;
  overflow: hidden;
}
.sidebar { display: flex; flex-direction: column; gap: 16px; height: 100%; max-height: 100%; overflow-y: auto; padding-right: 4px; }
.center-area { display: flex; flex-direction: column; gap: 16px; min-width: 0; height: 100%; min-height: 0; contain: layout; }

/* ---------- Panel ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  transition: all var(--t-med) var(--ease);
  animation: fadeInUp 0.6s var(--ease) both;
}
.panel:hover { border-color: var(--border-strong); }
.panel-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.panel-title { font-size: 13px; font-weight: 600; color: var(--text-0); letter-spacing: 0.02em; display: flex; align-items: center; gap: 8px; }
.panel-title .emoji { font-size: 15px; }
.panel-badge { font-size: 10px; font-weight: 700; padding: 3px 8px; border-radius: 100px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #1a0f00; letter-spacing: 0.05em; text-transform: uppercase; }
.panel-subtitle { font-size: 12px; color: var(--text-2); line-height: 1.5; margin-bottom: 12px; }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: 10px; font-size: 13px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer;
  transition: all var(--t-fast) var(--ease);
  font-family: inherit; white-space: nowrap; position: relative; overflow: hidden;
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #1a0f00; box-shadow: 0 4px 14px rgba(255,138,61,0.35); }
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(255,138,61,0.5); }
.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; pointer-events: none; }
.btn-secondary { background: rgba(var(--overlay-rgb),0.05); color: var(--text-1); border-color: var(--border); }
.btn-secondary:hover { background: var(--surface-hover); border-color: var(--border-strong); color: var(--text-0); }
.btn-ghost { background: transparent; color: var(--text-2); }
.btn-ghost:hover { background: rgba(var(--overlay-rgb),0.05); color: var(--text-0); }
.btn-sm { padding: 6px 10px; font-size: 11.5px; border-radius: 8px; }
.btn::after { content: ''; position: absolute; top: 50%; left: 50%; width: 0; height: 0; border-radius: 50%; background: rgba(var(--overlay-rgb),0.3); transform: translate(-50%, -50%); transition: width 0.5s, height 0.5s; }
.btn:active::after { width: 300px; height: 300px; }

/* ---------- Toast ---------- */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 999; width: min(400px, calc(100vw - 48px)); height: 0; pointer-events: none; }
.toast {
  position: absolute; bottom: 0; right: 0; transform: translateY(var(--stack, 0px)); transition: transform 0.25s var(--ease);
  padding: 14px 18px; background: var(--surface-solid); border: 1px solid var(--border-strong); border-radius: var(--radius-md); box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: 12px; min-width: 280px; max-width: 100%;
  animation: toastIn 0.4s var(--ease); pointer-events: auto;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.info { border-left: 3px solid var(--info); }
.toast-icon { font-size: 18px; }
.toast-msg { font-size: 13px; color: var(--text-0); font-weight: 500; min-width: 0; overflow-wrap: anywhere; }
.toast.leaving { animation: toastOut 0.3s var(--ease) forwards; }
@keyframes toastIn { from { opacity: 0; transform: translate(40px, var(--stack, 0px)); } to { opacity: 1; transform: translate(0, var(--stack, 0px)); } }
@keyframes toastOut { to { opacity: 0; transform: translate(40px, var(--stack, 0px)); } }

/* ---------- Responsive: colapso a 1 columna ---------- */
@media (max-width: 1100px) {
  .app-main { grid-template-columns: 1fr; overflow-y: auto; height: auto; }
  .sidebar { overflow-y: visible; }
}