.powell-nav-cards-root {
    box-sizing: border-box;
    color: var(--ls-text);
}

/* 宿主侧栏已提供系统间距，内容入口不再叠加顶部留白。 */
.powell-nav-cards-spacing {
    display: flow-root;
}

/* 独立滚动口保留放大余量，负边距抵消余量，不改变原卡片的首屏位置。 */
.powell-nav-cards-scrollport {
    margin: -4px;
    padding: 4px;
}

.powell-nav-cards-root[data-floating="true"] {
    height: var(--powell-nav-cards-placeholder-height);
}

.powell-nav-cards-root[data-floating="true"] > .powell-nav-cards-spacing {
    position: fixed;
    z-index: 1;
    top: var(--powell-nav-cards-floating-top);
    inset-inline-start: var(--powell-nav-cards-floating-inline-start);
    width: var(--powell-nav-cards-floating-width);
}

.powell-nav-cards-root[data-floating="true"] .powell-nav-cards-scrollport {
    max-height: var(--powell-nav-cards-scroll-height);
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-width: thin;
}

.powell-nav-cards-root[data-floating-visible="false"] > .powell-nav-cards-spacing {
    visibility: hidden;
    pointer-events: none;
}

.powell-nav-cards-scrollport:focus-visible {
    outline: 0;
    background: var(--ls-primary-light);
    color: var(--ls-primary);
}

.powell-nav-cards-stack {
    display: flex;
    flex-direction: column;
    gap: var(--ls-gap);
}

.powell-nav-cards-stack[data-layout="shared_card"] {
    padding: 10px;
    border-radius: var(--ls-radius-sm);
    background: var(--ls-card-bg);
}

.powell-nav-cards-group {
    position: relative;
    min-width: 0;
    border-radius: var(--ls-radius-sm);
    transition: transform 240ms cubic-bezier(.16, 1, .3, 1);
}

.powell-nav-cards-stack[data-layout="group_cards"] > .powell-nav-cards-group {
    padding: 10px;
    background: var(--ls-card-bg);
}

.powell-nav-cards-group:is(:hover, :focus-within) {
    z-index: 1;
    transform: scale(1.025);
}

.powell-nav-cards-content {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    overflow: hidden;
    isolation: isolate;
    border-radius: var(--ls-radius-sm);
    background: var(--ls-bg-hover);
    color: inherit;
    text-decoration: none;
    transition: opacity 220ms ease;
}

/* 高度与配色来自管理员的分组设置；min-height 让长标题仍能把内容撑开。 */
.powell-nav-cards-group:is([data-kind="image"], [data-kind="background"]):not([data-height="0"]) > .powell-nav-cards-content {
    min-height: var(--powell-nav-cards-height);
}

.powell-nav-cards-group[data-kind="background"] > .powell-nav-cards-content {
    background: var(--powell-nav-cards-background);
}

.powell-nav-cards-group[data-kind="html"] > .powell-nav-cards-content {
    background: transparent;
}

.powell-nav-cards-group:is(:hover, :focus-within) > .powell-nav-cards-content {
    opacity: .96;
}

.powell-nav-cards-content:focus-visible {
    outline: 0;
}

.powell-nav-cards-content::before {
    position: absolute;
    z-index: 2;
    inset: 0;
    background: var(--ls-primary-light);
    opacity: 0;
    pointer-events: none;
    content: "";
}

.powell-nav-cards-content:focus-visible::before {
    opacity: .28;
}

.powell-nav-cards-content::after {
    position: absolute;
    z-index: 3;
    inset: 0;
    background: linear-gradient(110deg, transparent 20%, rgba(255, 255, 255, .06) 35%, rgba(255, 255, 255, .32) 48%, rgba(255, 255, 255, .05) 60%, transparent 75%);
    opacity: 0;
    transform: translateX(-125%);
    pointer-events: none;
    content: "";
}

.powell-nav-cards-group:is(:hover, :focus-within) > .powell-nav-cards-content::after {
    animation: powell-nav-cards-lightwave 850ms cubic-bezier(.16, 1, .3, 1);
}

/* 自适应图片保留自然比例；固定高度只让文字参与网格的内容高度计算。 */
.powell-nav-cards-image {
    grid-area: 1 / 1;
    display: block;
    width: 100%;
    height: auto;
    min-width: 0;
    min-height: 0;
    object-fit: cover;
    transition: opacity 220ms ease;
}

.powell-nav-cards-group:not([data-height="0"]) .powell-nav-cards-image {
    position: absolute;
    inset: 0;
    height: 100%;
}

.powell-nav-cards-group:is(:hover, :focus-within) .powell-nav-cards-image {
    opacity: .88;
}

.powell-nav-cards-image[hidden] {
    display: none;
}

.powell-nav-cards-text {
    grid-area: 1 / 1;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    color: var(--powell-nav-cards-text-color);
}

.powell-nav-cards-group[data-kind="image"] .powell-nav-cards-text {
    background: rgba(0, 0, 0, .13);
}

.powell-nav-cards-copy {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 0;
    padding: 18px 12px;
    text-align: center;
    overflow-wrap: anywhere;
}

.powell-nav-cards-title {
    margin: 0;
    font-size: 16px;
    font-weight: 500;
    line-height: 1.5;
}

.powell-nav-cards-subtitle {
    margin: 0;
    opacity: .88;
    font-size: 12px;
    font-weight: 400;
    line-height: 1.7;
}

.powell-nav-cards-image-fallback {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 72px;
    padding: 14px 12px;
    color: var(--ls-text-secondary);
    font-size: 12px;
    line-height: 1.7;
    text-align: center;
    overflow-wrap: anywhere;
}

.powell-nav-cards-image-fallback svg {
    display: block;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.powell-nav-cards-group[data-image-state="error"] > .powell-nav-cards-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.powell-nav-cards-group[data-image-state="error"] .powell-nav-cards-text {
    background: transparent;
    color: var(--ls-text);
}

.powell-nav-cards-html-body {
    min-width: 0;
}

.powell-nav-cards-html-frame {
    display: block;
    width: 100%;
    border: 0;
    border-radius: var(--ls-radius-sm);
    background: transparent;
}

@keyframes powell-nav-cards-lightwave {
    0% {
        opacity: 0;
        transform: translateX(-125%);
    }
    25% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateX(125%);
    }
}

@media (prefers-reduced-motion: reduce) {
    .powell-nav-cards-group,
    .powell-nav-cards-content,
    .powell-nav-cards-image {
        transition: none;
    }

    .powell-nav-cards-group:is(:hover, :focus-within) {
        transform: none;
    }

    .powell-nav-cards-group:is(:hover, :focus-within) > .powell-nav-cards-content::after {
        animation: none;
    }
}