/* ============================================
   萬大發電廠環境教育學習網 - 成果分享頁
   kun 2025-01-17
   ============================================ */

/* ============================================
   4張輪播圖設定覆蓋
   ============================================ */
.banner-carousel .carousel-slide {
    animation: fadeSlide4 16s infinite;
}

.banner-carousel .carousel-slide:nth-child(1) {
    animation-delay: 0s;
}

.banner-carousel .carousel-slide:nth-child(2) {
    animation-delay: 4s;
}

.banner-carousel .carousel-slide:nth-child(3) {
    animation-delay: 8s;
}

.banner-carousel .carousel-slide:nth-child(4) {
    animation-delay: 12s;
}

/* 淡入淡出動畫 (4張圖片版本，每張佔 25%) */
@keyframes fadeSlide4 {
    0% {
        opacity: 0;
    }

    5% {
        opacity: 1;
    }

    25% {
        opacity: 1;
    }

    30% {
        opacity: 0;
    }

    100% {
        opacity: 0;
    }
}

/* ============================================
   SHARING SECTION - 成果分享區塊
   ============================================ */
.sharing-section {
    max-width: var(--container-content);
    margin: var(--spacing-6xl) auto;
    padding: 0 var(--container-padding-md);
}

/* ============================================
   SHARING GALLERY - 相簿卡片
   ============================================ */
.sharing-gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-3xl);
}

.gallery-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.gallery-card:hover {
    transform: translateY(-4px);
}

/* 相簿圖片 */
.gallery-image {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.gallery-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.gallery-card:hover .gallery-image img {
    transform: scale(1.05);
}

/* TOP 標籤 */
.badge-top {
    position: absolute;
    top: 0;
    left: 0;
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 0 0 var(--radius-md) 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 相簿標題 */
.gallery-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

/* 相簿描述 */
.gallery-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet */
@media (max-width: 1024px) {
    .sub-nav-container {
        gap: var(--spacing-xl);
    }

    .sub-nav-item {
        font-size: var(--font-size-sm);
    }

    .sharing-gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-2xl);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .sub-nav {
        padding: var(--spacing-md) 0;
    }

    .sub-nav-container {
        gap: var(--spacing-md) var(--spacing-lg);
    }

    .sub-nav-item {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .sharing-section {
        margin: var(--spacing-4xl) auto;
    }

    .sharing-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }

    .gallery-title {
        font-size: var(--font-size-sm);
    }

    .gallery-desc {
        font-size: var(--font-size-xs);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .sub-nav-container {
        justify-content: flex-start;
        gap: var(--spacing-sm) var(--spacing-md);
    }

    .sub-nav-item {
        font-size: var(--font-size-xs);
    }

    .sharing-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }

    .badge-top {
        font-size: 10px;
        padding: 2px var(--spacing-sm);
    }
}