/* Base Wrapper */
.single-course-wrapper {
    background-color: #f8fafc;
    font-family: var(--font-body);
    padding: 35px 0 70px;
    color: var(--color-text);
    width: 100%;
}

.course-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Toast Notification Popup */
.course-toast-popup {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--color-title);
    color: var(--color-white);
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    z-index: 99999;
    font-size: 14px;
    font-weight: 500;
}

/* ==========================================================================
   2. MAIN 2-COLUMN LAYOUT (Desktop Base Layout)
   ========================================================================== */
.course-main-2col-layout {
    display: grid;
    grid-template-columns: 48% 50%;
    gap: 2%;
    margin-bottom: 40px;
    align-items: start;
}

/* ==========================================================================
   3. LEFT COLUMN: IMAGE + FLOATING OVERLAY CARD + TABS
   ========================================================================== */
.course-left-col {
    display: flex;
    flex-direction: column;
    gap: 30px;
    width: 100%;
}

.course-media-box {
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
}

/* Main Image Wrapper */
.course-main-image-wrapper {
    position: relative;
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: visible; /* Card overlapping visual stability */
    background: #000;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.course-main-image {
    width: 100%;
    height: 420px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.course-main-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* FLOATING OVERLAY CARD (Desktop Clean Centered Right Side) */
.product-price-cart {
    position: absolute;
    top: 50%;
    right: 0px !important;
    transform: translateY(-50%);
    width: 38% !important;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.9);
    z-index: 10;
}

/* Price Box */
.course-price-box {
    text-align: center;
    background: var(--color-bg-light);
    padding: 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 15px;
    border: 1px solid #bae6fd;
}

.price-label {
    display: block;
    font-size: 13px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.price-amount {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
}

.price-amount del {
    color: #94a3b8;
    font-size: 16px;
    margin-right: 6px;
    font-weight: 400;
}

.price-amount ins {
    text-decoration: none;
    color: var(--color-primary);
}

/* Schedule Box */
.course-schedule-box {
    background: #ffffff;
    padding: 12px;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--color-primary);
    margin-bottom: 15px;
    box-shadow: var(--shadow-sm);
}

.schedule-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-title);
    margin: 0 0 8px 0;
}

.schedule-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.schedule-list li {
    font-size: 12px;
    color: var(--color-text);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Variations Selector */
.course-variations-selector {
    margin-bottom: 15px;
}

.variation-heading {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-title);
    margin: 0 0 8px 0;
}

.variation-buttons-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.btn-variation-option {
    padding: 7px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-white);
    color: var(--color-text);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-body);
}

.btn-variation-option.selected,
.btn-variation-option:hover {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

/* Button CTA */
.btn-course-submit {
    width: 100%;
    padding: 13px;
    background: var(--hdr-gradient);
    color: var(--color-white);
    font-size: 16px;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 168, 236, 0.3);
    font-family: var(--font-body);
}

.btn-course-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 168, 236, 0.45);
}

/* Thumbnails */
.course-thumbnails {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.thumb-item {
    width: 65px;
    height: 65px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--color-white);
}

.thumb-item.active,
.thumb-item:hover {
    border-color: var(--color-primary);
}

.thumb-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Course Tabs Section */
.course-content-tabs-wrapper {
    background: var(--color-white);
    padding: 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.tabs-nav {
    display: flex;
    gap: 12px;
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.tab-link {
    padding: 10px 20px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-body);
}

.tab-link.active,
.tab-link:hover {
    background: var(--color-bg-light);
    color: var(--color-primary);
}

.tab-content-text {
    font-size: 15px;
    line-height: 1.8;
}

/* ==========================================================================
   4. RIGHT COLUMN: SIDEBAR & INFO CARDS
   ========================================================================== */
.sticky-right-sidebar {
    position: sticky;
    top: 25px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.course-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-title);
    margin: 0;
    line-height: 1.35;
    font-family: var(--font-heading);
}

.course-short-description {
    font-size: 15px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* Info Cards */
.course-info-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 22px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.card-learn {
    border-left: 4px solid var(--color-primary);
    background: #fafafa;
}

.card-benefits {
    border-left: 4px solid var(--color-accent-green);
    background: var(--color-white);
}

.card-why {
    border-left: 4px solid var(--color-accent-orange);
    background: #fafafa;
}

.course-info-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-title);
    margin: 0 0 14px 0;
    font-family: var(--font-heading);
}

.course-info-content {
    font-size: 14.5px;
    color: var(--color-text);
    line-height: 1.75;
}

.course-info-content ul {
    padding-left: 20px;
    margin: 0;
}

.course-info-content li {
    margin-bottom: 8px;
}

/* ==========================================================================
   5. RELATED PRODUCTS SECTION
   ========================================================================== */
.related-courses-section {
    margin-top: 50px;
    padding-top: 40px;
    border-top: 2px dashed var(--color-border);
    width: 100%;
}

.section-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-title);
    margin-bottom: 28px;
    font-family: var(--font-heading);
}

.related-courses-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.course-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.course-card a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.card-image {
    width: 100%;
    height: 170px;
    overflow: hidden;
    background: #f1f5f9;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.card-details {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.card-details h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-title);
    margin: 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-price {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-primary);
}

.btn-related-view {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-dark-teal);
    margin-top: 4px;
    transition: color 0.2s;
}

.course-card:hover .btn-related-view {
    color: var(--color-primary);
}

/* ==========================================================================
   6. RESPONSIVE DESIGN FOR ALL DEVICES (মিডিয়া কোয়েরি)
   ========================================================================== */

/* 1. Large Screens & Desktops (1200px - 1400px) */
@media (max-width: 1399px) {
    .course-main-image {
        height: 380px;
    }
    
    .product-price-cart {
        width: 52%;
        right: 10px;
        padding: 16px;
    }
}

/* 2. Laptops & Small Desktops (1025px - 1199px) */
@media (max-width: 1199px) {
    .course-main-2col-layout {
        grid-template-columns: 50% 48%;
        gap: 2%;
    }

    .course-main-image {
        height: 360px;
    }

    .product-price-cart {
        width: 55%;
        padding: 15px;
    }

    .related-courses-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 3. Tablets / iPads (768px - 1024px) */
@media (max-width: 1024px) {
    .course-main-2col-layout {
        grid-template-columns: 1fr;
        gap: 35px;
    }

    .sticky-right-sidebar {
        position: static; /* Disable sticky on tablet */
    }

    .course-main-image {
        height: 400px;
    }

    .product-price-cart {
        position: absolute;
        top: 50%;
        right: 20px;
        transform: translateY(-50%);
        width: 45%;
        background: rgba(255, 255, 255, 0.98);
    }

    .related-courses-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}

/* 4. Large Mobile Devices (481px - 767px) */
@media (max-width: 767px) {
    .single-course-wrapper {
        padding: 20px 0 40px;
    }

    .course-container {
        padding: 0 15px;
    }

    /* ইমেজের ওপরের কার্ডটি স্বাভাবিক লেআউটে নিচে চলে আসবে */
    .course-main-image-wrapper {
        overflow: hidden;
    }

    .course-main-image {
        height: auto;
        aspect-ratio: 16 / 9;
    }

    .product-price-cart {
        position: relative;
        top: 0;
        right: 0;
        transform: none;
        width: 100%;
        margin-top: 15px;
        background: var(--color-white);
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--color-border);
    }

    .course-title {
        font-size: 22px;
    }

    .tabs-nav {
        flex-direction: column;
        gap: 8px;
    }

    .tab-link {
        width: 100%;
        text-align: left;
    }

    .course-content-tabs-wrapper {
        padding: 18px;
    }

    .related-courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .course-thumbnails {
        justify-content: center;
    }
}

/* 5. Small Mobile Devices (Up to 480px) */
@media (max-width: 480px) {
    .related-courses-grid {
        grid-template-columns: 1fr;
    }

    .thumb-item {
        width: 55px;
        height: 55px;
    }

    .price-amount {
        font-size: 20px;
    }

    .btn-course-submit {
        font-size: 15px;
        padding: 11px;
    }

    .course-info-card {
        padding: 16px;
    }

    .section-title {
        font-size: 20px;
    }
}