/* ============================================
   萬大發電廠環境教育學習網 - 課程詳細頁
   kun 2025-01-16
   ============================================ */

/* ============================================
   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;
    }
}

/* ============================================
   COURSE OUTLINE SECTION - 課程大綱區塊
   ============================================ */
.course-outline-section {
    max-width: var(--container-content);
    margin: var(--spacing-6xl) auto;
    padding: 0 var(--container-padding-md);
}

.course-outline-content {
    display: flex;
    gap: var(--spacing-4xl);
    margin-top: var(--spacing-4xl);
    align-items: flex-start;
}

/* 左側圖片 */
.course-outline-image {
    flex: 0 0 45%;
    max-width: 400px;
}

.course-outline-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* 右側資訊 */
.course-outline-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.course-outline-info .info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.course-outline-info .info-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
    flex-shrink: 0;
}

.course-outline-info .info-label {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    white-space: nowrap;
}

.course-outline-info .info-value {
    font-size: var(--font-size-base);
    color: var(--color-primary);
}

/* ============================================
   COURSE INTRO SECTION - 課程簡介區塊
   ============================================ */
.course-intro-section {
    max-width: var(--container-content);
    margin: 0 auto var(--spacing-6xl);
    padding: 0 var(--container-padding-md);
}

.course-intro-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.course-intro-header .intro-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.course-intro-header .intro-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.course-intro-content {
    margin-bottom: var(--spacing-4xl);
}

.intro-list {
    padding-left: var(--spacing-xl);
    margin: 0;
}

.intro-list li {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: var(--line-height-loose);
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   COURSE GALLERY - 課程圖片展示
   ============================================ */
.course-gallery {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-4xl);
}

.gallery-item {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.gallery-item img {
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.gallery-item:hover img {
    transform: scale(1.03);
}

/* ============================================
   COURSE ACTIONS - 回上一頁按鈕
   ============================================ */
.course-actions {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-4xl);
}

.btn-back-page {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-3xl);
    background: var(--color-primary-light);
    color: var(--color-white);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-2xl);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn-back-page:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(22, 169, 201, 0.3);
}

.btn-back-page:active {
    transform: translateY(0);
}

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

/* Tablet */
@media (max-width: 1024px) {
    .course-outline-content {
        gap: var(--spacing-3xl);
    }

    .course-outline-image {
        flex: 0 0 40%;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .course-outline-section {
        margin: var(--spacing-4xl) auto;
    }

    .course-outline-content {
        flex-direction: column;
        align-items: center;
    }

    .course-outline-image {
        flex: none;
        width: 100%;
        max-width: 320px;
    }

    .course-outline-info {
        width: 100%;
    }

    .course-outline-info .info-item {
        flex-wrap: wrap;
    }

    .course-outline-info .info-label,
    .course-outline-info .info-value {
        font-size: var(--font-size-sm);
    }

    .course-intro-section {
        margin-bottom: var(--spacing-4xl);
    }

    .course-gallery {
        gap: var(--spacing-md);
    }

    .btn-back-page {
        width: 100%;
        justify-content: center;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .course-outline-info .info-icon {
        width: 20px;
        height: 20px;
    }

    .course-outline-info .info-label,
    .course-outline-info .info-value {
        font-size: var(--font-size-xs);
    }

    .intro-list li {
        font-size: var(--font-size-xs);
    }

    .course-gallery {
        grid-template-columns: 1fr;
    }
}