body {
    background: var(--background-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

@media (prefers-color-scheme: dark) {
    body {
        background: radial-gradient(circle at 50% 0%, oklch(23.5% 0.025 55.4) 0%, var(--background-color) 75%);
    }
}

.dark-theme body,
body.dark-theme {
    background: radial-gradient(circle at 50% 0%, oklch(23.5% 0.025 55.4) 0%, var(--background-color) 75%);
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

main > h1 {
    text-align: center;
    color: var(--font-header-color);
    margin-bottom: 1.25rem;
}

.tab-nav {
    display: flex;
    width: 100%;
    max-width: 480px;
    gap: 10px;
    margin-bottom: 1rem;
}

.tab-nav label {
    flex: 1;
    text-align: center;
    cursor: pointer;
    padding: 10px 16px;
    background: var(--background-card-color);
    border: 1px solid var(--default-border-color);
    border-radius: .75rem;
    font-weight: var(--font-weight-semibold);
    color: var(--font-default-color);
    user-select: none;
    transition: background-color 0.2s, color 0.2s;
}

#tab-iam-trigger:checked ~ .tab-nav label[for="tab-iam-trigger"],
#tab-qr-trigger:checked ~ .tab-nav label[for="tab-qr-trigger"] {
    background-color: var(--button-primary-color);
    color: #fff;
    border-color: var(--button-primary-color);
}

main form {
    width: 100%;
    max-width: 480px;
    background: var(--background-card-color);
    border: 1px solid var(--default-border-color);
    border-radius: .75rem;
    padding: 1.5rem;
    box-sizing: border-box;
    display: grid;
}

.tab {
    grid-area: 1 / 1;
    display: none;
}

#tab-iam-trigger:checked ~ form #tab-iam {
    display: block;
}

#tab-qr-trigger:checked ~ form #tab-qr {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    min-height: 250px;
}

header, footer {
    padding: 1.4rem 0;
    color: var(--font-default-color);
}

footer {
    text-align: center;
}

label {
    display: block;
    margin-top: .75rem;
    font-weight: var(--font-weight-semibold);
    color: var(--font-default-color);
}

input {
    --space: .40rem;
    background: var(--background-card-color);
    color: var(--font-default-color);
    margin: .5rem 0;
    --space-responsive: calc(var(--space) + .2rem);
    padding: var(--space-responsive) calc(var(--space-responsive) * 1.5);
    border-radius: var(--default-border-radius);
    border: 1px solid var(--default-border-color);
    width: 100%;
    font-size: var(--font-normal-size);
}

input::placeholder {
    color: var(--font-muted-color);
    opacity: 1;
}

input:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

section {
    margin: calc(var(--default-spacing) * 1.5) 0;
}

button {
    --space: .40rem;
    background: var(--button-primary-color);
    color: #fff;
    margin: .75rem 0 0 0;
    --space-responsive: calc(var(--space) + .4rem);
    padding: var(--space-responsive) calc(var(--space-responsive) * 2);
    border-radius: 6px;
    border: 1px solid var(--default-border-color);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-normal-size);
    width: 100%;
    cursor: pointer;
}

button:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 3px;
}

.d-block {
    display: block;
}

.canvas-container {
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
}

#qr-canvas {
    border: 1px solid var(--default-border-color);
    border-radius: 6px;
    display: block;
}

.tab-switch {
    display: none;
}

.qr-status-msg {
    margin-top: 12px;
    font-size: 14px;
    color: var(--font-muted-color);
}

.qr-refresh-btn {
    display: none;
    margin-top: 12px;
    width: auto;
}