.footer-newsletter__heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.footer-newsletter__expand {
    display: grid;
    place-items: center;
    flex: 0 0 28px;
    width: 28px;
    height: 28px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 6px;
    color: inherit;
    background: transparent;
    cursor: pointer;
}

.footer-newsletter__expand:hover {
    background: rgba(255, 255, 255, 0.09);
}

.footer-newsletter__expand .icon,
.footer-newsletter > div > button[type="submit"] .icon {
    width: 16px;
    height: 16px;
}

.footer-newsletter__expand .icon {
    transform: rotate(-45deg);
}

.footer-newsletter {
    --newsletter-control-size: 36px;
}

.footer-newsletter > div > input {
    box-sizing: border-box;
    height: var(--newsletter-control-size);
}

.footer-newsletter > div > button[type="submit"] {
    box-sizing: border-box;
    width: var(--newsletter-control-size);
    min-width: var(--newsletter-control-size);
    max-width: var(--newsletter-control-size);
    height: var(--newsletter-control-size);
    min-height: var(--newsletter-control-size);
    max-height: var(--newsletter-control-size);
    aspect-ratio: 1;
    padding: 0;
    border-radius: 50%;
    place-self: center;
}

@media (max-width: 820px) {
    .footer-newsletter {
        --newsletter-control-size: 44px;
    }

    .footer-newsletter > div {
        grid-template-columns: minmax(0, 1fr) var(--newsletter-control-size);
        align-items: center;
    }
}

.subscription-dialog {
    container-type: inline-size;
    box-sizing: border-box;
    width: min(900px, calc(100% - 24px));
    max-width: calc(100% - 24px);
    max-height: calc(100dvh - 24px);
    margin: auto;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 18px;
    color: var(--ink);
    background: var(--surface);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.subscription-dialog::backdrop {
    background: rgba(18, 24, 32, 0.56);
}

.subscription-dialog__layout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.subscription-dialog__image {
    position: relative;
    min-width: 0;
    width: 100%;
    height: min(55cqw, calc(100dvh - 26px));
    background: var(--surface-soft);
}

.subscription-dialog__image img {
    position: absolute;
    inset: 0;
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.subscription-dialog__content {
    position: relative;
    min-width: 0;
    min-height: 0;
    /* 由左侧图片区域决定行高，文案和反馈过长时在右侧滚动。 */
    contain: size;
    align-self: stretch;
    align-content: safe center;
    overflow-y: auto;
    padding: clamp(36px, 7cqw, 56px) 3.5cqw 3cqw;
    font-size: clamp(10px, 1.875cqw, 15px);
}

.subscription-dialog h2 {
    margin: 1.25cqw 0 1.75cqw;
    font-family: var(--font-display);
    font-size: calc(clamp(16px, 4cqw, 32px) - var(--subscription-title-reduction, 0px));
    line-height: 1.12;
}

.subscription-dialog__content > p {
    margin: 0 0 2.5cqw;
    color: var(--muted);
    line-height: 1.5;
}

.subscription-dialog form {
    display: grid;
    gap: 1.25cqw;
}

.subscription-dialog label {
    font-size: clamp(10px, 1.7cqw, 13.6px);
    font-weight: 600;
}

.subscription-dialog input {
    width: 100%;
    min-width: 0;
    min-height: clamp(28px, 5.5cqw, 44px);
    padding: 1.25cqw;
    border: 1px solid var(--line);
    border-radius: 6px;
    color: var(--ink);
    background: var(--surface);
    font: inherit;
}

.subscription-dialog__close {
    top: max(6px, 1.5cqw);
    right: max(6px, 1.5cqw);
    width: clamp(28px, 4.5cqw, 36px);
    height: clamp(28px, 4.5cqw, 36px);
}

.subscription-dialog form .btn {
    min-height: clamp(28px, 5.5cqw, 44px);
    padding: 1.25cqw;
    font-size: inherit;
    line-height: 1.5;
}

.subscription-dialog :focus-visible,
.footer-newsletter :focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 3px;
}

.subscription-feedback {
    margin: 12px 0 0;
    font-size: 0.85rem;
    line-height: 1.6;
}

.subscription-dialog .subscription-feedback[data-type="error"] {
    color: #a52525;
}

.subscription-dialog .subscription-feedback {
    margin: 1.5cqw 0 0;
    font-size: inherit;
}

[data-subscription-form] button:disabled {
    opacity: 0.65;
    cursor: wait;
}

@media (max-height: 500px) {
    .subscription-dialog__content {
        padding-top: 36px;
        padding-bottom: 1.5cqw;
    }

    .subscription-dialog h2 {
        margin: 0.75cqw 0 1cqw;
        font-size: calc(clamp(16px, 2.75cqw, 22px) - var(--subscription-title-reduction, 0px));
    }

    .subscription-dialog__content > p {
        margin-bottom: 1.25cqw;
    }

    .subscription-dialog form {
        gap: 0.75cqw;
    }

}

@media (min-width: 480px) and (max-height: 360px) {
    .subscription-dialog__content {
        padding-top: 1cqw;
        padding-bottom: 1cqw;
    }

    .subscription-dialog h2 {
        padding-right: 5cqw;
    }
}

@media (max-width: 820px) {
    .subscription-dialog {
        --subscription-title-reduction: 2px;
    }

    .subscription-dialog__content > p {
        font-size: calc(clamp(10px, 1.875cqw, 15px) - 1px);
    }
}