/* ==========================================================================
   product-presentation.css
   PRESENTATION PAGE (BÀI GIẢNG MẪU) MODERN REDESIGN
   ========================================================================== */

/* Restore root font size for modern design system compatibility */
html {
    font-size: 16px !important;
}

body {
    font-family: var(--font-body) !important;
    font-size: 16px !important;
    color: var(--color-text-main) !important;
    line-height: 1.6 !important;
}

/* Main layout wrapper */
.l-topBody.presentation {
    margin-top: 80px; /* aligns with new header height */
    background-color: var(--color-bg-primary);
}

/* Banner section */
.p-lecture {
    position: relative;
    min-height: 480px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    background: radial-gradient(circle at 75% 20%, rgba(26, 117, 229, 0.18) 0%, transparent 45%),
                radial-gradient(circle at 15% 85%, rgba(244, 160, 0, 0.12) 0%, transparent 35%),
                url("/Assets/images/lecture/bg-lecture.jpg") no-repeat center;
    background-size: cover;
    padding: 80px 0;
    box-sizing: border-box;
    border-bottom: none !important;
    overflow: hidden;
}

.p-lecture::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, rgba(9, 21, 36, 0.75) 0%, rgba(9, 21, 36, 0.35) 50%, rgba(9, 21, 36, 0.1) 100%);
    z-index: 1;
}

.p-lecture_title.custom {
    position: relative;
    z-index: 2;
    margin-left: 8%;
    color: #FFFFFF !important;
    max-width: 600px;
    font-family: var(--font-heading);
    text-align: left;
}

.p-lecture_title h2.title {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 3.2rem !important;
    letter-spacing: -1px;
    margin-bottom: 8px;
    text-transform: uppercase;
    color: #FFFFFF !important;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.p-lecture_title strong.number {
    font-family: var(--font-heading);
    font-size: 7rem !important;
    font-weight: 800;
    line-height: 1 !important;
    background: linear-gradient(135deg, #FFFFFF 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: block;
    margin: 10px 0;
    text-shadow: none;
}

.p-lecture_title p.update {
    font-family: var(--font-body);
    font-size: 1.35rem !important;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9) !important;
    margin-bottom: 28px;
    line-height: 1.5;
}

/* Button overrides for hero */
.p-topBanner_content_buttons {
    margin-top: 28px;
}

/* Grid blocks & categories */
.l-topSection {
    padding: 0 0 60px;
    background-color: transparent;
    margin-top: 0 !important; /* override old negative margins */
    position: relative;
    overflow: hidden;
}

/* Mesh glows */
.bg-glow {
    position: absolute !important;
    border-radius: var(--radius-full) !important;
    filter: blur(120px) !important;
    z-index: 0 !important;
    pointer-events: none !important;
}

.glow-blue {
    background: radial-gradient(circle, rgba(var(--color-primary-rgb), 0.15) 0%, rgba(26, 117, 229, 0.02) 70%) !important;
}

.glow-orange {
    background: radial-gradient(circle, rgba(var(--color-accent-rgb), 0.1) 0%, rgba(244, 160, 0, 0.01) 70%) !important;
}

.p-block {
    border-bottom: none !important;
    padding: 0 !important;
    max-width: 1240px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.p-block.presentation {
    border-bottom: none !important;
}

.p-block.theme {
    border-bottom: none !important;
    padding-bottom: 60px !important;
}


/* Grid cards */
.p-block_lectures {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    padding-left: 0 !important;
}

.presentation-card {
    --card-bg: #FFFFFF;
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-md) !important;
    border: 2px solid transparent !important;
    background: linear-gradient(var(--card-bg), var(--card-bg)) padding-box,
                var(--color-border) border-box !important;
    box-shadow: var(--shadow-sm) !important;
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal) !important;
    position: relative;
}

.presentation-card:hover {
    transform: translateY(-6px) !important;
    box-shadow: var(--shadow-lg), 0 12px 35px rgba(0, 74, 153, 0.15) !important;
    background: linear-gradient(var(--card-bg), var(--card-bg)) padding-box,
                conic-gradient(from var(--border-angle), #1a75e5, #004a99, #f4a000, #a855f7, #1a75e5) border-box !important;
    animation: border-spin 3s linear infinite !important;
}

/* Image Thumbnail Area */
.presentation-card .img-wrapper {
    display: block !important;
    position: relative;
    width: 100% !important;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background-color: var(--color-bg-secondary) !important;
    cursor: pointer;
    margin: 0 !important;
    border-radius: 0 !important;
}

.presentation-card .img-wrapper img.presentation {
    width: 100% !important;
    height: 100% !important;
    min-height: 0 !important;
    max-height: none !important;
    object-fit: cover !important;
    border: none !important;
    border-radius: 0 !important;
    transition: transform var(--transition-normal) !important;
}

.presentation-card:hover .img-wrapper img.presentation {
    transform: scale(1.05) !important;
}

/* Hover overlay and control buttons */
.image-hover {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background: rgba(9, 21, 36, 0.5) !important;
    backdrop-filter: blur(4px) !important;
    -webkit-backdrop-filter: blur(4px) !important;
    opacity: 0 !important;
    transition: opacity var(--transition-normal) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 16px !important;
    z-index: 2 !important;
}

.presentation-card .img-wrapper:hover .image-hover {
    opacity: 1 !important;
    height: 100% !important;
}

.image-play-video {
    position: static !important;
    left: auto !important;
    top: auto !important;
    transform: none !important;
    width: 48px !important;
    height: 48px !important;
    cursor: pointer !important;
    transition: transform var(--transition-fast) ease !important;
}

.image-play-video:hover {
    transform: scale(1.1) !important;
}

.presentation-download {
    position: static !important;
    left: auto !important;
    top: auto !important;
    transform: none !important;
    width: 48px !important;
    height: 48px !important;
    border-radius: 50% !important;
    background-color: #FFFFFF !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    box-shadow: var(--shadow-md) !important;
    transition: all var(--transition-fast) ease !important;
    cursor: pointer !important;
    margin-top: 0 !important; /* resets old margin */
    padding: 0 !important;
}

.presentation-download i {
    color: var(--color-primary) !important;
    font-size: 16px !important;
}

.presentation-download:hover {
    transform: scale(1.1) !important;
    background: linear-gradient(135deg, var(--color-accent) 0%, #e09300 100%) !important;
    box-shadow: 0 4px 12px rgba(244, 160, 0, 0.25) !important;
}

.presentation-download:hover i {
    color: #FFFFFF !important;
}

/* Download Modal styling overrides */
#downloadDemos .modal-dialog {
    max-width: 480px;
}

#downloadDemos .modal-content {
    border-radius: var(--radius-lg) !important;
    border: none !important;
    box-shadow: var(--shadow-xl) !important;
    overflow: hidden;
}

#downloadDemos .modal-header {
    border-bottom: none !important;
    padding: 16px 24px 0 !important;
}

#downloadDemos .modal-header .close {
    font-size: 28px !important;
    opacity: 0.5 !important;
    transition: opacity 0.2s;
    outline: none !important;
}

#downloadDemos .modal-header .close:hover {
    opacity: 0.8 !important;
}

.avn-presentation-download {
    padding: 8px 32px 32px 32px !important;
}

.avn-presentation-download h3 {
    font-family: var(--font-heading) !important;
    color: var(--color-primary-dark) !important;
    font-weight: 700 !important;
    font-size: 1.5rem !important;
    margin-bottom: 8px !important;
}

.avn-presentation-download p {
    font-family: var(--font-body) !important;
    color: var(--color-text-sub) !important;
    font-size: 0.95rem !important;
    margin-bottom: 24px !important;
    line-height: 1.5 !important;
}

.avn-presentation-download .form-group {
    margin-bottom: 20px !important;
}

.avn-presentation-download label {
    font-family: var(--font-body) !important;
    font-weight: 600 !important;
    font-size: 0.9rem !important;
    color: var(--color-text-main) !important;
    margin-bottom: 8px !important;
    display: block !important;
}

.avn-presentation-download .form-control {
    border: 1px solid var(--color-border) !important;
    border-radius: var(--radius-sm) !important;
    padding: 12px 16px !important;
    font-size: 0.95rem !important;
    transition: all var(--transition-fast) !important;
    box-shadow: none !important;
    font-family: var(--font-body) !important;
    height: auto !important;
    box-sizing: border-box !important;
}

.avn-presentation-download .form-control:focus {
    border-color: var(--color-primary-light) !important;
    box-shadow: 0 0 0 3px rgba(0, 74, 153, 0.15) !important;
    outline: none !important;
}

.avn-presentation-download .btn-main {
    background: linear-gradient(135deg, var(--color-accent) 0%, #e09300 100%) !important;
    color: #FFFFFF !important;
    font-family: var(--font-heading) !important;
    font-weight: 700 !important;
    font-size: 1rem !important;
    border: none !important;
    padding: 14px 28px !important;
    border-radius: var(--radius-sm) !important;
    cursor: pointer !important;
    margin-top: 24px !important;
    box-shadow: 0 4px 12px rgba(244, 160, 0, 0.25) !important;
    transition: all var(--transition-fast) !important;
    height: auto !important;
}

.avn-presentation-download .btn-main:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 16px rgba(244, 160, 0, 0.35) !important;
}

.avn-required-label {
    color: var(--color-error) !important;
}

/* Responsive adjustments for Presentation page */
@media screen and (max-width: 1200px) {
    .p-block {
        padding: 0 16px !important;
    }
    .p-block_lectures {
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 16px !important;
    }
}

@media screen and (max-width: 960px) {
    .l-topBody.presentation {
        margin-top: 70px !important;
    }
    .p-lecture {
        min-height: auto !important;
        padding: 80px 20px 60px !important;
        background-position: left center !important;
    }
    .p-lecture_title.custom {
        margin-left: 4% !important;
    }
    .p-lecture_title h2.title {
        font-size: 2.2rem !important;
    }
    .p-lecture_title strong.number {
        font-size: 5rem !important;
    }
    .p-lecture_title p.update {
        font-size: 1.1rem !important;
    }
    .l-topSection {
        padding: 0 0 40px !important;
    }
    .p-block {
        padding: 0 16px !important;
    }
    .p-block_lectures {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

@media screen and (max-width: 576px) {
    .p-lecture_title.custom {
        margin-left: 0 !important;
    }
    .p-lecture_title h2.title {
        font-size: 1.8rem !important;
    }
    .p-lecture_title strong.number {
        font-size: 4rem !important;
    }
    .p-lecture_title p.update {
        font-size: 1rem !important;
        margin-bottom: 20px !important;
    }
    .l-topSection {
        padding: 0 0 32px !important;
    }
    .p-block {
        padding: 0 12px !important;
    }
    .p-block_lectures {
        grid-template-columns: 1fr !important;
        gap: 20px !important;
    }
}

/* Back to top button styling overrides */
.back-to-top {
    position: fixed !important;
    bottom: 24px !important;
    right: 80px !important;
    z-index: 999 !important;
    width: 44px !important;
    height: 44px !important;
    border-radius: 50% !important;
    background: var(--color-primary) !important;
    border: none !important;
    box-shadow: var(--shadow-md) !important;
    padding: 0 !important;
    margin: 0 !important; /* resets margin-top: -0.5em */
    cursor: pointer;
}

.back-to-top .btn-scroll-top {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    width: 100% !important;
    height: 100% !important;
    color: #FFFFFF !important;
    text-decoration: none !important;
}

.back-to-top .btn-scroll-top i {
    font-size: 18px !important;
    color: #FFFFFF !important;
    line-height: 1 !important;
    display: inline-block !important;
    margin: 0 !important;
    padding: 0 !important;
    vertical-align: middle !important;
}