*, *::before, *::after {
    box-sizing: border-box;
}

:root {
    --color-bg: #231942;
    --color-surface: #5E548E;

    --color-primary: #9F86C0;
    --color-secondary: #BE95C4;
    --color-accent: #E0B1CB;

    --color-text: #E0B1CB;
    --color-text-soft: #BE95C4;

    --color-button: #9F86C0;
    --color-button-hover: #BE95C4;
    --color-highlight: #E0B1CB;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

html, body {
    height: 100%;
}

#app {
    flex: 1;
}

header {
    background: var(--color-surface);
    padding: 1.5rem 2rem;
    text-align: center;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    padding: 0;
    margin: 0;
}

a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
    transition: opacity 0.2s ease;
}

a:hover {
    color: var(--color-text-soft);
    opacity: 0.75;
}

.home, .about, .notFound {
    justify-content: center;
}

.panel {
    width: min(100%, 700px);
    margin: 0 auto;
    margin-top: 2rem;
    padding: 1rem;
    background-color: var(--color-surface);
    border-radius: 12px;
    border: 2px solid var(--color-accent);
    box-shadow: rgba(149, 157, 165, 0.2) 0px 8px 24px;
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--color-surface);
    color: var(--color-text);
}

/* base mobile */
.chat {
    width: min(100%, 1100px);
    margin: 1rem auto 2rem;
    padding: 1rem;
    display: grid;
    gap: 1rem;
    align-items: start;
}

aside {
    display: none;
}

#messages {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 0;
    max-height: 55vh;
    overflow-y: auto;
    padding-right: 0.25rem;
    padding-bottom: 0.75rem;
    
}

#messages > div {
    padding: 0.75rem 1rem;
    border-radius: 12px;
    width: auto;
    max-width: 80%;
    word-break: break-word;
}

#messages .user {
    align-self: flex-end;
    color: var(--color-text);
    background-color: var(--color-bg);
}

#messages .model {
    align-self: flex-start;
    color: var(--color-bg);
    background-color: var(--color-secondary);
}

#messages .user p,
#messages .model p {
    margin: 0;
}

.character-image {
    display: block;
    width: 100%;
    max-width: 220px;
    margin: auto;
    border-radius: 50%;
    border: 2px solid var(--color-accent);
    background-color: var(--color-accent);
}

#chat-form {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 0;
    border-top: 2px solid var(--color-accent);
}

#chat-input {
    flex: 1;
    padding: 0.85rem 1rem;
    border: 2px transparent;
    border-radius: 12px;
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: 1rem;
    outline: none;
}

#chat-input:focus {
    border: 2px solid var(--color-accent);
}

button {
    padding: 0.85rem 1.2rem;
    border: 2px solid var(--color-accent);
    border-radius: 12px;
    background-color: var(--color-accent);
    color: var(--color-surface);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

button:hover {
    background-color: var(--color-button-hover);
    border-color: var(--color-button-hover);
}

/* aspecto tablet */
@media (min-width: 768px) {
    aside {
        display: none;
    }
}

/* aspecto desktop */
@media (min-width: 1024px) {
    .chat {
        grid-template-columns: 2fr 1fr;
        align-items: start;
    }

    .chat aside {
        display: block;
    }
}