:root {
    --color-primary: #9565eb;
    --color-secondary: #c4aeee;
    --border-radius-small: 4px;
    --border-radius-medium: 8px;
    --border-radius-large: 12px;
    --border-radius-full: 100%;
    --spacing-1: 4px;
    --spacing-2: 8px;
    --spacing-3: 12px;
    --spacing-4: 16px;
    font-size: 62.5%;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    box-shadow: none;
    font: inherit;
    text-rendering: optimizeLegibility;
}

body {
    height: 100vh;
    height: 100svh;

    font-family: 'Inter', sans-serif;
    font-size: 1.4rem;
}

.main {
    height: 100%;

    display: flex;
    justify-content: center;
    align-items: center;

    background: no-repeat center/cover url("../img/wave.svg"), var(--color-secondary);
}

.window {
    max-width: 768px;
    max-height: 600px;
    width: 100%;
    height: 100%;

    border-radius: var(--border-radius-medium);
    box-shadow: oklch(0 0 0 / 0.1) 2px 2px 2px;

    overflow: clip;
    display: flex;
    gap: var(--spacing-2);

    background-color: oklch(100% 0% 0 / 0.8);

    backdrop-filter: blur(10px);
}

.window-sidebar {
    width: 200px;
    user-select: none;
}

.section {
    height: 100%;

    padding: var(--spacing-3);

    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.section__title {
    font-weight: 500;
    padding: var(--spacing-2) 0;
}

.contact {
    padding: var(--spacing-2);
    border-radius: var(--border-radius-medium);
}

.contact--current {
    background-color: oklch(0 0 0 / 0.1);
}

.contact-name {
    font-weight: 500;

}

.window-main {
    flex: 1;

    padding: var(--spacing-2);

    box-shadow: oklch(0 0 0 / 0.1) -1px 0 1px;

    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);

    background-color: #fff;
}

.title-bar {
    padding: var(--spacing-3) var(--spacing-2);
}

.title-bar-title {
    color: #222;
    font-weight: 600;
    font-size: 1.7rem;
    user-select: none;
}

.messages-box {
    flex: 1;

    padding: var(--spacing-3);

    border-radius: var(--border-radius-small);
    box-shadow: inset 0 0 1px oklch(0 0 0 / 0.1);

    overflow-y: scroll;
    display: flex;
    flex-direction: column-reverse;
    gap: var(--spacing-1);

    background: scroll repeat bottom/50% url("../img/clouds.png"), skyblue;
    background-position-y: 0;
    image-rendering: pixelated;
}

.message-bubble {
    width: fit-content;

    padding: var(--spacing-3);

    border-radius: var(--border-radius-medium);
    box-shadow: oklch(0 0 0 / 0.1) 1px 1px 1px;

    background-color: #fff;
}

.message-bubble--sent {
    align-self: flex-end;
    background-color: var(--color-primary);
    color: #ffffff;
}

#message-submit-form {
    width: 100%;
    display: flex;
    gap: var(--spacing-1);
}

#message-input {
    width: 100%;

    border-radius: var(--border-radius-small);

    padding: var(--spacing-3);

    box-shadow: inset 0 0 1px oklch(0 0 0 / 0.1);

    background-color: #f1f1f1;
}

#message-send-button {
    border-radius: var(--border-radius-small);

    padding: var(--spacing-3);

    background-color: var(--color-primary);
    color: #ffffff;
}

#message-send-button:active {
    filter: brightness(90%);
    transform: scale(98%);
}

@media only screen and (max-width: 600px) {
    .window {
        max-height: 100%;
        border-radius: 0;
    }

    .window-sidebar {
        display: none;
    }
}