:root {
  /* MODO CLARO - Paleta GMC */
  --bg-base: #f8f8f8;
  --bg-surface: #ffffff;
  --bg-sidebar: #ffffff;
  --text-main: #181818;
  --text-muted: #766f69;
  --border-color: #bababa;
  --primary: #f9b62b;
  /* TADA / Madey */
  --primary-hover: #fcad2f;
  --sidebar-active-bg: #fff8eb;
  --sidebar-active-border: #f9b62b;
}

[data-theme="dark"] {
  /* MODO OSCURO - Paleta GMC */
  --bg-base: #181818;
  /* Madey oscuro */
  --bg-surface: #231e1f;
  /* TADA oscuro */
  --bg-sidebar: #211c1d;
  --text-main: #ffffff;
  --text-muted: #979999;
  --border-color: #3b3932;
  --primary: #efe630;
  /* Geminis amarillo */
  --primary-hover: #f9b62b;
  --sidebar-active-bg: #3b3932;
  --sidebar-active-border: #efe630;
}

/* Reset y Reglas Globales */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-main);
  transition: background-color 0.3s, color 0.3s;
}

textarea {
  resize: none;
}

/* Petición estricta: Textareas no redimensionables */
a {
  text-decoration: none;
  color: inherit;
}

/* Estructura Principal Responsiva */
.app-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s;
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0;
}

.nav-item {
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  color: var(--text-muted);
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background-color: var(--bg-base);
  color: var(--text-main);
}

.nav-item.active {
  background-color: var(--sidebar-active-bg);
  color: var(--text-main);
  border-left-color: var(--sidebar-active-border);
  font-weight: bold;
}

/* Contenedor Derecho (Header + Main + Footer) */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.top-header {
  height: 60px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
}

.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
}

.main-footer {
  padding: 1rem 2rem;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  text-align: right;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Toggle Modo Oscuro */
.theme-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--border-color);
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

input:checked+.slider {
  background-color: var(--primary);
}

input:checked+.slider:before {
  transform: translateX(20px);
}

/* Botones Globales */
.btn-primary {
  padding: 0.75rem 1.5rem;
  background-color: var(--primary);
  color: #181818;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-primary:disabled {
  background-color: var(--border-color);
  cursor: not-allowed;
}

.btn-secondary {
  padding: 0.75rem 1.5rem;
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-secondary:hover {
  background-color: var(--bg-base);
}

input:not([type="email"]):not([type="password"]):not([type="hidden"]),
textarea {
  text-transform: uppercase;
}

/* ==========================================================================
   CINTILLO GLOBAL DE AVISOS DEL SISTEMA Y MARCA DE AGUA
   ========================================================================== */
.system-global-banner {
  width: 100%;
  padding: 0.55rem 1.25rem;
  font-size: 0.8rem;
  line-height: 1.4;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  z-index: 9999;
  box-sizing: border-box;
  border-bottom: 1px solid transparent;
}

.system-global-banner.tipo-demo {
  background-color: #fffbeb;
  color: #92400e;
  border-bottom-color: #fde68a;
}

.system-global-banner.tipo-mantenimiento {
  background-color: #fef2f2;
  color: #991b1b;
  border-bottom-color: #fecaca;
}

.system-global-banner.tipo-info {
  background-color: #eff6ff;
  color: #1e40af;
  border-bottom-color: #bfdbfe;
}

[data-theme="dark"] .system-global-banner.tipo-demo {
  background-color: #451a03;
  color: #fde68a;
  border-bottom-color: #78350f;
}

[data-theme="dark"] .system-global-banner.tipo-mantenimiento {
  background-color: #450a0a;
  color: #fecaca;
  border-bottom-color: #7f1d1d;
}

[data-theme="dark"] .system-global-banner.tipo-info {
  background-color: #172554;
  color: #bfdbfe;
  border-bottom-color: #1e3a8a;
}

.system-banner-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.system-banner-text {
  text-align: center;
}

.system-banner-tag {
  font-weight: 800;
  letter-spacing: 0.03em;
  margin-right: 0.35rem;
}

/* Marca de agua diagonal atravesable por el mouse */
.system-global-watermark {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9990;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  user-select: none;
}

.system-global-watermark span {
  font-size: clamp(2rem, 5vw, 4.2rem);
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-main, #0f172a);
  opacity: 0.035;
  transform: rotate(-24deg);
  white-space: nowrap;
  border: 3px dashed currentColor;
  padding: 0.6rem 1.8rem;
  border-radius: 12px;
}

/* Responsivo Básico Temporal */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    transform: translateX(-100%);
    z-index: 1000;
    height: 100%;
  }

  .sidebar.open {
    transform: translateX(0);
  }
}