/* --- Contenedor Principal --- */
#vaia-chat-container {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    width: 90%;
    max-width: 800px; /* Aumentado de 500px a 800px */
    margin: 40px auto;
    background: #ffffff;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* --- Encabezado --- */

/* --- Encabezado --- */
#vaia-chat-header {
    background: linear-gradient(135deg, #6B73FF, #000DFF);
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid transparent;
}
#vaia-chat-header-title h2 { margin: 0; font-size: 1.4em; font-weight: 600; }
#vaia-chat-header-title p { margin: 2px 0 0; font-size: 0.8em; opacity: 0.9; }

#vaia-chat-header-buttons {
    display: flex;
    gap: 10px;
}

.vaia-header-btn, #vaia-new-chat, #vaia-print-chat {
    border: none;
    background-color: transparent;
    color: white;
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-repeat: no-repeat;
    background-position: center;
    background-size: 20px;
    transition: background-color 0.2s;
}

.vaia-header-btn:hover, #vaia-new-chat:hover, #vaia-print-chat:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

#vaia-new-chat {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white' width='24px' height='24px'%3E%3Cpath d='M17.65 6.35C16.2 4.9 14.21 4 12 4c-4.42 0-7.99 3.58-7.99 8s3.57 8 7.99 8c3.73 0 6.84-2.55 7.73-6h-2.08c-.82 2.33-3.04 4-5.65 4-3.31 0-6-2.69-6-6s2.69-6 6-6c1.66 0 3.14.69 4.22 1.78L13 11h7V4l-2.35 2.35z'/%3E%3C/svg%3E");
}

#vaia-print-chat {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white' width='24px' height='24px'%3E%3Cpath d='M19 8H5c-1.66 0-3 1.34-3 3v6h4v4h12v-4h4v-6c0-1.66-1.34-3-3-3zm-3 11H8v-5h8v5zm3-7c-.55 0-1-.45-1-1s.45-1 1-1 1 .45 1 1-.45 1-1 1zm-1-9H6v4h12V3z'/%3E%3C/svg%3E");
}

/* --- Pantalla Inicial --- */
#vaia-initial-screen {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    padding: 20px;
    text-align: center;
}
.vaia-initial-header {
    font-size: 1.5em;
    color: #333;
    margin-bottom: 30px;
}
.vaia-initial-btn {
    background-color: #f0f0f0;
    border: 1px solid #ccc;
    border-radius: 8px;
    padding: 15px 25px;
    font-size: 1.1em;
    cursor: pointer;
    width: 80%;
    max-width: 300px;
    margin-bottom: 15px;
    transition: background-color 0.2s, border-color 0.2s;
}
.vaia-initial-btn:hover {
    background-color: #e5e5e5;
    border-color: #aaa;
}

/* --- Pantalla de Selección de Materia --- */
.vaia-subject-selection {
    padding: 10px 20px;
    text-align: center;
}
.vaia-subject-selection h3 {
    font-size: 1.3em;
    color: #333;
    margin-top: 0;
    margin-bottom: 25px;
}
.vaia-subject-selection {
    display: flex;
    flex-wrap: wrap;
    gap: 15px; /* Espacio entre botones */
    justify-content: center;
}
.vaia-subject-btn {
    background-color: #fff;
    border: 1px solid #d0d7de;
    border-radius: 8px;
    padding: 12px 20px;
    font-size: 1em;
    cursor: pointer;
    flex-grow: 1;
    min-width: 150px; /* Ancho mínimo para cada botón */
    transition: all 0.2s ease-in-out;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.vaia-subject-btn:hover {
    background-color: #f6f8fa;
    border-color: #6B73FF;
    color: #6B73FF;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.06);
}


/* --- Caja de Mensajes --- */
#vaia-chat-box {
    height: 500px; /* Aumentado de 350px a 500px */
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    background-color: #f9f9f9;
}

/* Media Query para dispositivos móviles */
@media (max-width: 600px) {
    #vaia-chat-container {
        width: 100%;
        height: 100%;
        margin: 0;
        border-radius: 0;
    }
    #vaia-chat-box {
        flex-grow: 1; /* Ocupa todo el espacio disponible */
    }
}

.message {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    max-width: 85%;
}

.message-content {
    padding: 12px 18px;
    border-radius: 18px;
    line-height: 1.5;
    word-wrap: break-word;
}

/* Mensajes del Usuario */
.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}
.message.user .message-content {
    background-color: #E9EAFE;
    color: #333;
    border-bottom-right-radius: 4px;
}

/* Mensajes del Asistente */
.message.assistant {
    align-self: flex-start;
}
.message.assistant .message-content {
    background-color: #ffffff;
    color: #222;
    border: 1px solid #e5e5e5;
    border-bottom-left-radius: 4px;
}

/* --- Indicador de "Pensando..." --- */
.message.assistant.thinking .message-content {
    display: flex;
    align-items: center;
    gap: 10px;
    font-style: italic;
}

.message.assistant.thinking .spinner {
    width: 15px;
    height: 15px;
    border: 2px solid rgba(0,0,0,0.1);
    border-left-color: #6B73FF;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* --- Contenedor de Input --- */
#vaia-chat-input-container { display: flex; padding: 15px; border-top: 1px solid #e0e0e0; background: #fff; }
#vaia-chat-input {
    flex-grow: 1; border: 1px solid #ccc; border-radius: 20px;
    padding: 10px 18px; font-size: 1em; transition: border-color 0.3s;
}
#vaia-chat-input:focus { outline: none; border-color: #6B73FF; }
#vaia-chat-input:disabled { background-color: #f5f5f5; }

/* --- Botón de Enviar --- */
#vaia-chat-send {
    border: none;
    background-color: #6B73FF;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white' width='24px' height='24px'%3E%3Cpath d='M2.01 21L23 12 2.01 3 2 10l15 2-15 2z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 20px;
    color: white; border-radius: 50%;
    width: 44px; height: 44px; margin-left: 10px;
    cursor: pointer; transition: background-color 0.3s, transform 0.2s;
}
#vaia-chat-send:hover { background-color: #5A61E0; transform: translateY(-1px); }
#vaia-chat-send:disabled { background-color: #ccc; cursor: not-allowed; transform: none; }