:root {
    /* Tema claro */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-accent: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    --border-light: #e9ecef;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    
    /* Colores de estado */
    --color-primary: #007bff;
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;
    --color-muted: #6c757d;
    
    /* Colores específicos del chat */
    --user-bg: linear-gradient(135deg, #007bff, #0056b3);
    --bot-bg: var(--bg-primary);
    --bot-border: var(--border-color);
    --input-bg: var(--bg-primary);
    --input-border: var(--border-color);
    --header-bg: var(--bg-primary);
    
    /* Espaciado mínimo */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    
    /* Bordes */
    --border-radius-sm: 6px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
}

[data-theme="dark"] {
    /* Tema oscuro */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-accent: #404040;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #808080;
    --border-color: #404040;
    --border-light: #333333;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.4);
    
    /* Colores específicos del chat en oscuro */
    --user-bg: linear-gradient(135deg, #0d6efd, #0a58ca);
    --bot-bg: var(--bg-secondary);
    --bot-border: var(--border-color);
    --input-bg: var(--bg-secondary);
    --input-border: var(--border-color);
    --header-bg: var(--bg-secondary);
}

/* Icono del sol dorado en modo oscuro */
[data-theme="dark"] .theme-btn .fa-sun {
    color: #ffd700; /* Dorado */
}

[data-theme="dark"] .theme-btn:hover .fa-sun {
    color: #ffed4e; /* Dorado más claro al hacer hover */
}

/* Icono de la luna azul en modo claro */
.theme-btn .fa-moon {
    color: #007bff; /* Azul */
}

.theme-btn:hover .fa-moon {
    color: #0056b3; /* Azul más oscuro al hacer hover */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: all 0.3s ease;
    overflow-x: hidden;
    overflow-y: auto;
}

/* Layout principal - Mobile First */
.chat-app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: calc(var(--vh, 1vh) * 100); /* Altura dinámica del viewport para móviles */
    width: 100%;
    background: var(--bg-primary);
    overflow: visible;
}

/* Header */
.chat-header {
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm);
    flex-shrink: 0;
    overflow: visible;
}

.header-container {
    display: flex;
    align-items: stretch;
    gap: var(--spacing-md);
    overflow: visible;
}

.header-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: visible;
}

.header-top {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.chat-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-left: var(--spacing-md);
}

.chat-title i {
    color: var(--color-primary);
}

/* Controles principales */
.main-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: visible;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.main-controls::-webkit-scrollbar {
    display: none;
}

.control-btn {
    background: var(--bg-accent);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.control-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.control-btn:active {
    transform: translateY(0);
}

/* Botón micrófono - Altura exacta del título + controles */
.mic-btn {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    border: none;
    font-size: 1.6rem;
    color: white;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
    align-self: center;
}

/* Estados del micrófono con colores consistentes en ambos temas */

/* 1. Verificando (gris claro con pulso) */
.mic-btn.mic-checking {
    background: linear-gradient(135deg, #9e9e9e 0%, #757575 100%);
    box-shadow: 0 4px 20px rgba(158, 158, 158, 0.3);
    cursor: wait;
    animation: checking-pulse 2s infinite ease-in-out;
}

/* 2. No disponible (gris oscuro) */
.mic-btn.mic-unavailable {
    background: linear-gradient(135deg, #6c757d 0%, #495057 100%);
    box-shadow: 0 4px 20px rgba(108, 117, 125, 0.4);
    cursor: not-allowed;
    opacity: 0.7;
}

/* 3. Sin permisos (azul con brillo) */
.mic-btn.mic-no-permission {
    background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
    box-shadow: 0 4px 20px rgba(33, 150, 243, 0.4);
    cursor: pointer;
    animation: permission-glow 3s infinite ease-in-out;
}

/* 4. Conectando (azul-verde con rotación) */
.mic-btn.mic-connecting {
    background: linear-gradient(135deg, #00bcd4 0%, #0097a7 100%);
    box-shadow: 0 4px 20px rgba(0, 188, 212, 0.4);
    cursor: wait;
    animation: connecting-spin 1.5s infinite linear;
}

/* 5. Listo (verde con respiración) */
.mic-btn.mic-ready {
    background: linear-gradient(135deg, #4caf50 0%, #388e3c 100%);
    box-shadow: 0 4px 20px rgba(76, 175, 80, 0.4);
    cursor: pointer;
    animation: ready-breathe 4s infinite ease-in-out;
}

/* 6. Iniciando grabación (verde-amarillo con flash) */
.mic-btn.mic-starting {
    background: linear-gradient(135deg, #8bc34a 0%, #689f38 100%);
    box-shadow: 0 4px 20px rgba(139, 195, 74, 0.5);
    cursor: pointer;
    animation: starting-flash 0.5s ease-out;
}

/* 7. Grabando (rojo con pulso intenso) */
.mic-btn.mic-recording {
    background: linear-gradient(135deg, #f44336 0%, #d32f2f 100%);
    box-shadow: 0 4px 20px rgba(244, 67, 54, 0.6);
    cursor: pointer;
    animation: recording-pulse 1s infinite ease-in-out;
}

/* 8. Deteniendo (rojo-naranja con fade) */
.mic-btn.mic-stopping {
    background: linear-gradient(135deg, #ff5722 0%, #e64a19 100%);
    box-shadow: 0 4px 20px rgba(255, 87, 34, 0.5);
    cursor: pointer;
    animation: stopping-fade 0.8s ease-out;
}

/* 9. Procesando (naranja con rotación) */
.mic-btn.mic-processing {
    background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
    box-shadow: 0 4px 20px rgba(255, 152, 0, 0.5);
    cursor: not-allowed;
    animation: processing-rotate 2s infinite linear;
}

/* 10. Completado (verde brillante con éxito) */
.mic-btn.mic-completed {
    background: linear-gradient(135deg, #00e676 0%, #00c853 100%);
    box-shadow: 0 4px 20px rgba(0, 230, 118, 0.6);
    cursor: pointer;
    animation: completed-success 1s ease-out;
}

/* Efectos hover para estados interactivos */
.mic-btn.mic-no-permission:hover,
.mic-btn.mic-ready:hover,
.mic-btn.mic-recording:hover,
.mic-btn.mic-completed:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

.mic-btn.mic-unavailable:hover {
    transform: none;
    filter: none;
}

/* Botón deshabilitado */
.mic-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed !important;
    transform: none !important;
    animation: none !important;
}

.mic-btn:disabled:hover {
    transform: none !important;
    box-shadow: inherit !important;
    filter: none !important;
}

/* Timer */
.timer-display {
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--text-secondary);
    min-width: 45px;
    text-align: center;
    flex-shrink: 0;
}

/* Selector de voz */
.voice-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--bg-accent);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    flex: 1;
    min-width: 120px;
    max-width: 180px;
    position: relative;
}

.voice-selector > i {
    color: var(--text-secondary);
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* Select estándar del navegador */
.voice-select {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    padding: var(--spacing-xs) 0;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236c757d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 4px center;
    background-size: 12px;
    padding-right: 20px;
}

.voice-select:focus {
    color: var(--text-primary);
}

.voice-select option {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: var(--spacing-sm);
}

/* Botones específicos */
.mute-btn.active {
    background: var(--color-warning);
    color: white;
}

.download-btn:hover {
    background: var(--color-success);
    color: white;
}

.clear-btn:hover {
    background: var(--color-danger);
    color: white;
}

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

/* Barra de progreso */
.progress-bar {
    height: 2px;
    background: var(--border-light);
    overflow: hidden;
    border-radius: 1px;
}

.progress-fill {
    height: 100%;
    background: var(--color-primary);
    width: 0%;
    transition: width 0.1s ease;
}

/* Área de mensajes */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
}

/* Scrollbar personalizada */
.chat-messages::-webkit-scrollbar {
    width: 4px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Mensaje de bienvenida */
.welcome-message {
    text-align: center;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.welcome-message i {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    display: block;
}

.welcome-message p {
    margin: 0;
    font-size: 0.9rem;
}

/* Mensajes */
.message {
    margin-bottom: var(--spacing-md);
    animation: fadeIn 0.3s ease;
}

.message.user {
    text-align: right;
}

.message.bot {
    text-align: left;
}

.message-bubble {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-lg);
    max-width: 85%;
    word-wrap: break-word;
    position: relative;
    font-size: 0.9rem;
    line-height: 1.4;
}

.message.user .message-bubble {
    background: var(--user-bg);
    color: white;
}

.message.bot .message-bubble {
    background: var(--bot-bg);
    color: var(--text-primary);
    border: 1px solid var(--bot-border);
    padding-right: 40px;
}

/* Botón de reproducción */
.play-button {
    position: absolute;
    top: 50%;
    right: var(--spacing-sm);
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    font-size: 0.8rem;
}

.play-button:hover {
    background: var(--bg-accent);
    color: var(--text-primary);
    transform: translateY(-50%) scale(1.1);
}

.play-button.playing {
    color: var(--color-success);
    animation: playing-pulse 1.5s infinite;
}

.message-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* Área de entrada */
.chat-input-area {
    background: var(--input-bg);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-sm);
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.input-btn {
    background: var(--bg-accent);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.input-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.clear-text-btn:hover {
    background: var(--color-danger);
    color: white;
}

.send-btn {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.send-btn:hover {
    background: #0056b3;
    border-color: #0056b3;
}

.send-btn:disabled {
    background: var(--bg-accent);
    color: var(--text-muted);
    border-color: var(--border-color);
    cursor: not-allowed;
}

.message-input {
    flex: 1;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: inherit;
    font-size: 0.9rem;
    color: var(--text-primary);
    resize: none;
    outline: none;
    transition: all 0.2s ease;
    min-height: 40px;
    max-height: 120px;
}

.message-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.1);
}

.message-input::placeholder {
    color: var(--text-muted);
}

/* Animaciones */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-10px); }
}

/* Animaciones específicas del micrófono */
@keyframes checking-pulse {
    0%, 100% { 
        opacity: 0.7; 
        transform: scale(1);
        box-shadow: 0 4px 20px rgba(158, 158, 158, 0.3);
    }
    50% { 
        opacity: 1; 
        transform: scale(1.02);
        box-shadow: 0 6px 25px rgba(158, 158, 158, 0.5);
    }
}

@keyframes permission-glow {
    0%, 100% { 
        box-shadow: 0 4px 20px rgba(33, 150, 243, 0.4);
    }
    50% { 
        box-shadow: 0 6px 30px rgba(33, 150, 243, 0.8);
    }
}

@keyframes connecting-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes ready-breathe {
    0%, 100% { 
        transform: scale(1); 
        box-shadow: 0 4px 20px rgba(76, 175, 80, 0.4);
    }
    50% { 
        transform: scale(1.03); 
        box-shadow: 0 6px 25px rgba(76, 175, 80, 0.6);
    }
}

@keyframes starting-flash {
    0% { 
        transform: scale(1); 
        filter: brightness(1);
        box-shadow: 0 4px 20px rgba(139, 195, 74, 0.5);
    }
    50% { 
        transform: scale(1.1); 
        filter: brightness(1.3);
        box-shadow: 0 8px 35px rgba(139, 195, 74, 0.8);
    }
    100% { 
        transform: scale(1); 
        filter: brightness(1);
        box-shadow: 0 4px 20px rgba(139, 195, 74, 0.5);
    }
}

@keyframes recording-pulse {
    0% { 
        transform: scale(1); 
        box-shadow: 0 4px 20px rgba(244, 67, 54, 0.6);
    }
    50% { 
        transform: scale(1.08); 
        box-shadow: 0 8px 40px rgba(244, 67, 54, 0.9);
    }
    100% { 
        transform: scale(1); 
        box-shadow: 0 4px 20px rgba(244, 67, 54, 0.6);
    }
}

@keyframes stopping-fade {
    0% { 
        transform: scale(1.05); 
        filter: brightness(1.2);
        box-shadow: 0 6px 25px rgba(255, 87, 34, 0.7);
    }
    100% { 
        transform: scale(1); 
        filter: brightness(1);
        box-shadow: 0 4px 20px rgba(255, 87, 34, 0.5);
    }
}

@keyframes processing-rotate {
    0% { 
        transform: rotate(0deg);
        box-shadow: 0 4px 20px rgba(255, 152, 0, 0.5);
    }
    50% {
        box-shadow: 0 6px 25px rgba(255, 152, 0, 0.7);
    }
    100% { 
        transform: rotate(360deg);
        box-shadow: 0 4px 20px rgba(255, 152, 0, 0.5);
    }
}

@keyframes completed-success {
    0% { 
        transform: scale(1); 
        filter: brightness(1);
        box-shadow: 0 4px 20px rgba(0, 230, 118, 0.6);
    }
    30% { 
        transform: scale(1.15); 
        filter: brightness(1.4);
        box-shadow: 0 8px 40px rgba(0, 230, 118, 0.9);
    }
    100% { 
        transform: scale(1); 
        filter: brightness(1);
        box-shadow: 0 4px 20px rgba(0, 230, 118, 0.6);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 5px rgba(23, 162, 184, 0.3); }
    50% { box-shadow: 0 0 15px rgba(23, 162, 184, 0.6); }
}

@keyframes breathe {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes playing-pulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* Indicador de pensamiento */
.thinking {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-style: italic;
}

.thinking-dots {
    display: flex;
    gap: var(--spacing-xs);
}

.thinking-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--text-secondary);
    animation: thinking 1.4s infinite ease-in-out;
}

.thinking-dot:nth-child(1) { animation-delay: -0.32s; }
.thinking-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes thinking {
    0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

/* Responsive Design - Mobile First */

/* Tablet */
@media (min-width: 768px) {
    .chat-title {
        font-size: 1.3rem;
    }
    
    .main-controls {
        gap: var(--spacing-sm);
    }
    
    .control-btn {
        min-width: 40px;
        height: 40px;
    }
    
    .mic-btn {
        width: 80px;
        height: 80px;
        font-size: 1.8rem;
    }
    
    .voice-selector {
        min-width: 160px;
        max-width: 200px;
    }
    
    .chat-messages {
        padding: var(--spacing-lg);
    }
    
    .message-bubble {
        max-width: 75%;
        font-size: 1rem;
    }
    
    .chat-input-area {
        padding: var(--spacing-lg);
    }
    
    .input-btn {
        width: 44px;
        height: 44px;
    }
    
    .message-input {
        font-size: 1rem;
        padding: var(--spacing-md) var(--spacing-lg);
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .chat-app {
        max-width: 800px;
        margin: 0 auto;
        height: 100vh;
        box-shadow: var(--shadow-lg);
    }
    
    .chat-title {
        font-size: 1.4rem;
    }
    
    .main-controls {
        gap: var(--spacing-md);
    }
    
    .control-btn {
        min-width: 44px;
        height: 44px;
    }
    
    .mic-btn {
        width: 90px;
        height: 90px;
        font-size: 2rem;
    }
    
    .voice-selector {
        min-width: 180px;
        max-width: 220px;
    }
    
    .message-bubble {
        max-width: 70%;
    }
    
    .chat-input-area {
        padding: var(--spacing-xl);
    }
    
    .input-btn {
        width: 48px;
        height: 48px;
    }
}

/* Estados especiales para móvil */
@media (max-width: 480px) {
    .chat-app {
        /* Asegurar que use la altura dinámica en móviles */
        height: calc(var(--vh, 1vh) * 100);
        min-height: calc(var(--vh, 1vh) * 100);
    }
    
    .header-container {
        gap: var(--spacing-sm);
    }
    
    .chat-title {
        font-size: 1rem;
        margin-left: var(--spacing-sm);
    }
    
    .main-controls {
        flex-wrap: nowrap;
        gap: 2px;
        overflow-x: auto;
    }
    
    .voice-selector {
        min-width: 90px;
        max-width: 120px;
        font-size: 0.75rem;
    }
    
    .voice-select {
        font-size: 0.75rem;
        background-size: 10px;
        padding-right: 16px;
    }
    
    .control-btn {
        min-width: 28px;
        height: 28px;
        font-size: 0.75rem;
        padding: 4px;
    }
    
    .mic-btn {
        width: 60px;
        height: 60px;
        font-size: 1.4rem;
    }
    
    .timer-display {
        font-size: 0.7rem;
        min-width: 35px;
    }
    
    .message-bubble {
        max-width: 90%;
        font-size: 0.85rem;
    }
    
    .input-btn {
        width: 36px;
        height: 36px;
    }
    
    .message-input {
        font-size: 0.9rem;
    }
    
    /* Asegurar que el área de entrada sea visible */
    .chat-input-area {
        position: relative;
        z-index: 10;
    }
}

/* Utilidades */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Estados de carga */
.loading {
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}