:root {
    font-family: Roboto, Ubuntu, Segoe UI, system-ui, sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.25;
    color: #212121;

    --colour-primary: hsl(221, 97%, 54%);
    --colour-primary-on: hsl(0, 0%, 100%);
    --colour-recording: hsl(11, 100%, 50%);
    --colour-recording-on: hsl(0, 0%, 100%);

    --colour-error: hsl(11, 100%, 50%);
    --colour-surface: hsl(210, 17%, 98%);
    --colour-text: hsl(0, 0%, 20%);
    --colour-gray: hsl(214, 6%, 94%);

    --colour-chat-self-background: hsl(210, 17%, 98%);
    --color-chat-self-text: hsl(0, 0%, 20%);

    --colour-chat-ai-background: var(--colour-primary);
    --color-chat-ai-text: var(--colour-primary-on);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    height: 100dvh;

    display: flex;
    flex-direction: column;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header nav > * {
    margin: 0 1rem;
}

header nav a {
    text-decoration: none;
    color: var(--colour-primary);
}

form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

form#voice-gen-request {
    max-width: 60ch;
    margin-inline: auto;
}

form div:has(> button[type=submit]) {
    display: flex;
    gap: 0.5rem;
}

form div:has(> button[type=submit]) > input,
form div:has(> button[type=submit]) > select {
    flex: 1;
}

form label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.25lh;
}

form input,
form select {
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: 0.25rem;
    background-color: whitesmoke;
    border: 1px solid lightgray;
    font-family: inherit;
    font-size: inherit;
}

form input:not([type=checkbox]):last-child,
form select:last-child,
form input:not([type=checkbox]):has(~span:last-child),
form select:has(~span:last-child) {
    width: 100%;
}

form textarea {
    padding: 0.75rem;
    border-radius: 0.25rem;
    border: 1px solid lightgray;
    background-color: whitesmoke;
    font-family: inherit;
    font-size: inherit;
    resize: vertical;
    width: 100%;
}

form button[type=submit] {
    display: inline;
    margin-left: auto;

    padding: 0.2rem 1.5rem;
    border-radius: 0.25rem;
    background: royalblue;
    border: none;

    color: var(--colour-primary-on);
    cursor: pointer;

    font-size: 0.9rem;
    font-weight: 500;
}

dialog[open] {
    padding: 1.5rem;
    border: none;
    border-radius: 0.5rem;
    background-color: var(--colour-surface);
    max-width: 90vw;
}

dialog::backdrop {
    background-color: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(5px);
}

dialog progress {
    width: 100%;
    height: 2rem;
    overflow: hidden;
}

dialog progress[value]::-webkit-progress-value {
    background-color: var(--colour-primary);
}

@media (width > 1366px) {
    header {
        padding: 1rem 20vw;
    }

    main {
        padding: 1rem 20vw;
    }
}