/* --- VARIABLES DE DISEÑO --- */
:root {
    --background-color: #1e1e2f; /* Un azul oscuro más profundo */
    --chat-container-bg: #27293d; /* Un tono ligeramente más claro para el contenedor */
    --bot-message-bg: #3a3f57;
    --user-message-bg: #4f537b; /* Un color distintivo para el usuario */
    --input-bg-color: #2c2e43;
    --text-color: #e0e0ff;
    --header-text-color: #ffffff;
    --accent-color: #8a79f7; /* Un violeta/azul vibrante */
    --font-family: 'Poppins', -apple-system, BlinkMacSystem-Font, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --border-radius-md: 12px;
    --border-radius-lg: 18px;
}

/* --- ESTILOS GENERALES Y SCROLLBAR --- */
html, body {
    height: 100%;
    margin: 0;
    font-family: var(--font-family);
    background-color: var(--background-color);
    background-image: radial-gradient(circle at top left, rgba(138, 121, 247, 0.1), transparent 40%);
    color: var(--text-color);
    overflow: hidden; /* Evita el scroll en el body */
}

/* Estilo de la barra de desplazamiento para navegadores Webkit */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--chat-container-bg);
}
::-webkit-scrollbar-thumb {
    background-color: var(--bot-message-bg);
    border-radius: 10px;
    border: 2px solid var(--chat-container-bg);
}
::-webkit-scrollbar-thumb:hover {
    background-color: var(--accent-color);
}


/* --- CONTENEDOR PRINCIPAL DEL CHAT --- */
#chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--chat-container-bg);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

/* --- ENCABEZADO --- */
.chat-header {
    padding: 20px;
    font-weight: 600;
    font-size: 1.2rem;
    text-align: center;
    color: var(--header-text-color);
    background-color: rgba(0,0,0,0.1);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

/* --- ÁREA DE MENSAJES --- */
.chat-messages {
    flex-grow: 1;
    padding: 30px 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* --- BLOQUES DE MENSAJES INDIVIDUALES --- */
.message-block {
    display: flex;
    gap: 15px;
    align-items: flex-end; /* Alinea al final para el efecto "cola" */
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%; /* Avatares circulares */
    background-color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.message-content {
    padding: 15px 20px;
    border-radius: var(--border-radius-lg);
    max-width: 85%;
    word-wrap: break-word;
    line-height: 1.6;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

/* Estilos para el BOT */
.message-block.bot .message-content {
    background-color: var(--bot-message-bg);
    border-bottom-left-radius: var(--border-radius-md);
}
.message-block.bot .message-avatar {
    background-color: var(--accent-color);
}

/* Estilos para el USUARIO */
.message-block.user {
    flex-direction: row-reverse; /* Mensajes del usuario a la derecha */
}
.message-block.user .message-content {
    background-color: var(--user-message-bg);
    color: var(--header-text-color);
    border-bottom-right-radius: var(--border-radius-md);
}
.message-block.user .message-avatar {
    background-color: #6c757d;
}

/* Indicador de "escribiendo..." mejorado */
.message-content.thinking {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 15px 20px;
}
.dot {
    width: 8px;
    height: 8px;
    background-color: rgba(255,255,255,0.5);
    border-radius: 50%;
    animation: thinking-bounce 1.4s infinite ease-in-out both;
}
.dot:nth-child(1) { animation-delay: -0.32s; }
.dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes thinking-bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}

/* --- FORMULARIO DE ENTRADA --- */
.chat-form-container {
    padding: 20px;
    background-color: rgba(0,0,0,0.1);
    border-top: 1px solid rgba(255,255,255,0.05);
}
.chat-form {
    display: flex;
    align-items: center;
    background-color: var(--input-bg-color);
    border-radius: var(--border-radius-lg);
    padding: 5px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}

.chat-form input {
    flex-grow: 1;
    background: none;
    border: none;
    color: var(--text-color);
    padding: 12px 20px;
    font-size: 1rem;
    font-family: var(--font-family);
}

.chat-form input:focus {
    outline: none;
}

.chat-form input::placeholder {
    color: #888aaa;
}

.chat-form button {
    background-color: var(--accent-color);
    border: none;
    width: 44px;
    height: 44px;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease;
}

.chat-form button:hover {
    background-color: #a192ff;
}

.chat-form button svg {
    width: 24px;
    height: 24px;
    fill: #ffffff;
}