/* Variables raíz (dark mode por defecto) */
:root {
  --font-family: 'Poppins', sans-serif;
  --font-menu: 'Mulish', sans-serif;
  --primary-color: #000000; /* Negro principal */
  --secondary-color: #333333; /* Gris oscuro */
  --accent-color: #FFFFFF; /* Blanco contraste */
  --background-color: #121212; /* Fondo oscuro */
  --text-color: #E0E0E0; /* Texto claro */
  --border-color: #424242; /* Bordes */
  --success-color: #4CAF50; /* Éxito */
  --warning-color: #FFC107; /* Advertencia */
  --danger-color: #F44336; /* Peligro */
  --info-color: #2196F3; /* Info */
  --link-icon-color: #FFFFFF; /* Iconos links */
  --tooltip-bg: #212121; /* Fondo tooltip */
  --tooltip-text: #FFFFFF; /* Texto tooltip */
  --scrollbar-width: 4px; /* Scrollbar delgado */
  --border-radius: 8px; /* Bordes redondos */
  /* Transparencias + Blur (Glassmorphism) */
  --glass-bg: rgba(0, 0, 0, 0.1);
  --glass-bg-strong: rgba(0, 0, 0, 0.5);
  --glass-bg-strong-rd: rgba(255, 1, 1, 0.5);
  --glass-blur: 10px;
}

/* Light mode automático */
@media (prefers-color-scheme: light) {
  :root {
    --primary-color: #FFFFFF;
    --secondary-color: #EDEDED;
    --accent-color: #000000;
    --background-color: #FFFFFF;
    --text-color: #212121;
    --border-color: #E0E0E0;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-bg-strong: rgba(255, 255, 255, 0.5);
    --glass-bg-strong-rd: rgba(0, 0, 0, 0.5);
    --glass-blur: 10px;
  }
}

/* Tema explícito dark */
html[data-theme="dark"] {
  --primary-color: #000000;
  --secondary-color: #333333;
  --accent-color: #FFFFFF;
  --background-color: #121212;
  --text-color: #E0E0E0;
  --border-color: #424242;
  --success-color: #4CAF50;
  --warning-color: #FFC107;
  --danger-color: #F44336;
  --info-color: #2196F3;
  --link-icon-color: #FFFFFF;
  --tooltip-bg: #212121;
  --tooltip-text: #FFFFFF;
  --scrollbar-width: 4px;
  --border-radius: 8px;
  --glass-bg: rgba(0, 0, 0, 0.1);
  --glass-bg-strong: rgba(0, 0, 0, 0.5);
  --glass-bg-strong-rd: rgba(255, 1, 1, 0.5);
  --glass-blur: 10px;
}

/* Tema explícito light */
html[data-theme="light"] {
  --primary-color: #FFFFFF;
  --secondary-color: #F5F5F5;
  --accent-color: #000000;
  --background-color: #FFFFFF;
  --text-color: #212121;
  --border-color: #E0E0E0;
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-bg-strong: rgba(210, 210, 210, 0.5);
  --glass-bg-strong-rd: rgba(0, 0, 0, 0.5);
  --glass-blur: 10px;
}

/* Base */
html, body {
  font-family: var(--font-family);
}

body {
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: var(--font-family);
}

/* Inputs */
input, textarea {
  border: none;
  border-bottom: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-color);
  font-family: var(--font-family);
}

/* Scrollbars */
::-webkit-scrollbar {
  width: var(--scrollbar-width);
  height: var(--scrollbar-width);
}

::-webkit-scrollbar-track {
  background: var(--secondary-color);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
}

/* Botones */
.button-primary, .submit-btn {
  background: var(--accent-color);
  color: var(--primary-color);
  border: none;
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  transition: opacity .3s, transform .3s;
}

.button-primary:hover, .submit-btn:hover {
  opacity: 0.85;
  transform: scale(1.05);
}

.button-secondary {
  background: var(--secondary-color);
  color: var(--text-color);
  border: none;
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  transition: opacity .3s, transform .3s;
}

.button-secondary:hover {
  opacity: 0.85;
  transform: scale(1.05);
}

/* Estados de color */
.danger { color: var(--danger-color); }
.warning { color: var(--warning-color); }
.success { color: var(--success-color); }

/* Modales y toasts */
.modal, .toast {
  background: var(--background-color);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

/* Links icono */
a.link-icon {
  display: inline-block;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary-color);
  color: var(--link-icon-color);
  text-decoration: none;
}

/* Tooltips */
.tooltip {
  position: relative;
}

.tooltip:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--tooltip-bg);
  color: var(--tooltip-text);
  padding: 4px 8px;
  border-radius: var(--border-radius);
  white-space: nowrap;
}

/* Toggle switch genérico */
.toggle-switch {
  position: relative;
  width: 80px;
  height: 6px;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--glass-blur));
  border-radius: 3px;
  cursor: pointer;
  overflow: hidden;
  margin-top: 20px;
}

.toggle-switch .knob {
  position: absolute;
  top: 0;
  left: 4px;
  width: 32px;
  height: 6px;
  background: var(--accent-color);
  border-radius: 3px;
  transition: transform .4s;
}

.toggle-switch.active .knob,
html[data-theme="light"] .toggle-switch .knob {
  transform: translateX(44px);
}

.toggle-switch .bar {
  width: 100%;
  height: 6px;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--glass-blur));
  border-radius: 3px;
  position: relative;
  overflow: hidden;
}

.toggle-switch.sending .knob { transform: translateX(92px); }

.toggle-switch::before {
  content: attr(data-label);
  font-size: 14px;
  color: var(--text-color);
  margin-bottom: 8px;
  display: block;
}

.toggle-switch.sending::before { content: 'Enviando...'; }

/* Theme switch específico */
.theme-switch {
  position: fixed;
  top: 30px;
  right: 30px;
  width: 80px;
  height: 6px;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--glass-blur));
  border-radius: 3px;
  cursor: pointer;
  z-index: 10;
}

.switch-knob {
  position: absolute;
  top: 0;
  left: 4px;
  width: 32px;
  height: 6px;
  background: var(--accent-color);
  border-radius: 3px;
  transition: transform .4s;
}

html[data-theme="light"] .switch-knob {
  transform: translateX(44px);
}

@media (max-width: 768px) {
  .theme-switch {
    left: 50%;
    transform: translateX(-50%);
    right: auto;
  }
}

/* Keyboard hint */
.keyboard-hint {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 20;
  opacity: 1;
  transition: opacity 1s;
  pointer-events: none;
  display: none;
}

@media (min-width: 769px) {
  .keyboard-hint { display: block; }
}

.keyboard-hint.fade-out { opacity: 0; }

.hint-content {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--glass-blur));
  padding: 15px;
  border-radius: var(--border-radius);
  text-align: center;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.hint-content p { font-size: 11px; margin: 10px 0 0; }

.keys {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 25px;
  width: 100%;
}

.spacebar {
  width: 120px;
  height: 30px;
  background: var(--secondary-color);
  border-radius: 6px;
}

.arrows {
  display: grid;
  grid-template-columns: repeat(3, 35px);
  grid-template-rows: 35px 35px;
  gap: 5px;
}

.arrows .material-icons {
  font-size: 20px;
  background: var(--secondary-color);
  border-radius: 6px;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.arrows :nth-child(1) { grid-column: 2; }
.arrows :nth-child(2) { grid-column: 1; grid-row: 2; }
.arrows :nth-child(3) { grid-column: 2; grid-row: 2; }
.arrows :nth-child(4) { grid-column: 3; grid-row: 2; }

/* Menú overlay (index y páginas) */
.overlay-menu {
  opacity: 0;
  pointer-events: none;
  transition: opacity .4s;
}

.overlay-menu.open {
  opacity: 1;
  pointer-events: auto;
}

.profile:hover .overlay-menu.open,
.profile:hover .overlay-menu {
  opacity: 1;
  pointer-events: auto;
}

/* Items del menú */
.menu-list a {
  transition: transform .3s ease, background .3s;
}

.menu-list a:hover,
.menu-list a:focus {
  transform: scale(1.1);
  background: var(--glass-bg-strong);
  padding: 10px 20px;
  border-radius: var(--border-radius);
  outline: none;
}

.menu-list a:focus {
  outline: none;
  background: var(--glass-bg-strong);
  padding: 10px 20px;
  border-radius: var(--border-radius);
}