:root {
    --k-brand-base: oklch(0.4284 0.172 259.7);

    --ui-bg: #ffffff;
    --ui-bg-muted: oklch(from var(--k-brand-base) 0.97 0.015 h);
    --ui-bg-subtle: oklch(from var(--k-brand-base) 0.99 0.005 h);
    --ui-border: oklch(from var(--k-brand-base) 0.88 0.04 h);
    --ui-border-focus: oklch(from var(--k-brand-base) 0.55 0.16 h);

    --text-color: oklch(from var(--k-brand-base) 0.18 0.02 h);
    --text-muted: oklch(from var(--k-brand-base) 0.48 0.03 h);
    --text-on-brand: #ffffff;

    --ui-hover: oklch(from var(--k-brand-base) calc(l - 0.06) c h);
    --ui-active: oklch(from var(--k-brand-base) calc(l - 0.1) c h);

    --shadow-md: 0 4px 12px oklch(from var(--k-brand-base) 0.15 0.1 h / 0.14);
}

body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

button, input[type="submit"] {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    padding: 0.55rem 1.1rem;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    background: var(--k-brand-base);
    color: var(--text-on-brand);
    transition: background var(--transition-base), transform 100ms ease;
    user-select: none;

    &:hover {
        background: var(--ui-hover);
    }

    &:active {
        transform: translateY(1px);
        background: var(--ui-active);
    }
}

input,
textarea,
select {
    font: inherit;
    font-size: var(--font-small);
    width: 100%;
    padding: 0.6rem 0.85rem;
    background: var(--ui-bg);
    color: var(--text-color);
    border: 1px solid var(--ui-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base);
    outline: none;

    &:focus {
        outline: 2px solid var(--ui-border-focus);
        outline-offset: 2px;
    }
}

form > div {
    margin-block-end: var(--spacing-unit);
}

label {
    display: block;
    font-size: var(--font-small);
    margin-bottom: 0.35rem;
    font-weight: 700;
}

footer#credit {
    grid-column: full-start / full-end;
    position: sticky;
    top: 100vh;
    margin-top: auto;
    padding: var(--spacing-unit);
    font-size: var(--font-small);
    color: var(--text-muted);
    text-align: right;
    width: 100%;

    span {
        display: block;
        max-width: var(--container-width);
        margin-inline: auto;
        padding-inline: var(--spacing-unit);
    }
}