/* ==============================================
   Featured Links Module
   页面宽度基准：1366px
   ============================================== */

/* ── 包裹容器 ────────────────────────────────── */
.featured-links-wrap {
    display: grid;
    grid-template-columns: repeat(var(--fl-count, 4), 1fr);
    gap: 0;
    width: 100%;
    max-width: 1366px;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 8px;
}

/* ── 单个条目 ────────────────────────────────── */
.fl-item {
    position: relative;
    overflow: hidden;
    height: var(--fl-block-height, 260px);
}

/* ── 可点击链接层（撑满整个条目） ─────────────── */
.fl-inner {
    display: block;
    position: absolute;
    inset: 0;
    text-decoration: none;
    color: inherit;
    outline-offset: -3px;
}

/* ── 背景图片 ─────────────────────────────────── */
.fl-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: transform 0.55s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: transform;
}

.fl-inner:hover .fl-bg,
.fl-inner:focus-visible .fl-bg {
    transform: scale(1.06);
}

/* 无图片时的占位渐变 */
.fl-bg--placeholder {
    background: linear-gradient(135deg, #2d3748 0%, #4a5568 100%);
}

/* ── 遮罩层 ──────────────────────────────────── */
.fl-overlay {
    position: absolute;
    inset: 0;
    background: var(--fl-overlay, rgba(0, 0, 0, 0.10));
    transition: background 0.35s ease;
}

.fl-inner:hover .fl-overlay,
.fl-inner:focus-visible .fl-overlay {
    background: var(--fl-overlay, rgba(0, 0, 0, 0.55));
    filter: brightness(0.85);
}

/* ── 文字内容（垂直水平居中） ─────────────────── */
.fl-content {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 16px 20px;
    color: var(--fl-text-color, #ffffff);
    text-align: center;
    z-index: 1;
}

/* ── 标题 ─────────────────────────────────────── */
.fl-title {
    display: block;
    font-size: clamp(15px, 1.45vw, 20px);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 0.02em;
    text-shadow: 0 1px 6px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}

.fl-inner:hover .fl-title,
.fl-inner:focus-visible .fl-title {
    transform: translateY(-3px);
}

/* ── 副标题 ───────────────────────────────────── */
.fl-subtitle {
    display: block;
    font-size: clamp(12px, 1.1vw, 15px);
    font-weight: 400;
    opacity: 0.85;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
    line-height: 1.4;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.fl-inner:hover .fl-subtitle,
.fl-inner:focus-visible .fl-subtitle {
    opacity: 1;
    transform: translateY(-2px);
}

/* ── 箭头指示 ─────────────────────────────────── */
.fl-arrow {
    display: inline-block;
    font-size: 18px;
    opacity: 0;
    transform: translateX(-8px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    margin-top: 4px;
    color: #f2546a;
}

.fl-inner:hover .fl-arrow,
.fl-inner:focus-visible .fl-arrow {
    opacity: 0.9;
    transform: translateX(0);
}

/* ── 条目间分割线（不用 gap，改用伪元素） ─────── */
.fl-item + .fl-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12%;
    height: 76%;
    width: 1px;
    background: rgba(255, 255, 255, 0.58);
    z-index: 2;
    pointer-events: none;
}

/* ── 焦点无障碍 ──────────────────────────────── */
.fl-inner:focus-visible {
    outline: 3px solid #fff;
    outline-offset: -4px;
}

/* ==============================================
   响应式断点
   ============================================== */

/* 平板：两列 */
@media ( max-width: 900px ) {
    .featured-links-wrap {
        grid-template-columns: repeat(2, 1fr);
    }

    .fl-item {
        height: calc(var(--fl-block-height, 260px) * 0.9);
    }

    /* 移除第三、四格的左侧分割线（改为上边框） */
    .fl-item:nth-child(2n+1)::before {
        display: none;
    }
    .fl-item:nth-child(n+3)::after {
        content: '';
        position: absolute;
        top: 0;
        left: 12%;
        width: 76%;
        height: 1px;
        background: rgba(255, 255, 255, 0.18);
        z-index: 2;
        pointer-events: none;
    }
}

/* 手机：单列 */
@media ( max-width: 540px ) {
    .featured-links-wrap {
        grid-template-columns: 1fr;
        border-radius: 0;
    }

    .fl-item {
        height: calc(var(--fl-block-height, 260px) * 0.75);
    }

    .fl-item + .fl-item::before,
    .fl-item::after {
        display: none;
    }
}