/* =====================================================
   المتغيرات الأساسية
   ===================================================== */
:root {
    --primary-color: #1e3a5f;
    --primary-dark: #152a45;
    --secondary-color: #c9a227;
    --accent-color: #f5f7fa;
    --text-dark: #1a2a3a;
    --text-light: #5a6a7a;
    --white: #ffffff;
    --light-bg: #f8fafc;
    --gradient-primary: linear-gradient(135deg, #1e3a5f 0%, #2e5a8f 100%);
    --gradient-secondary: linear-gradient(135deg, #c9a227 0%, #e8c547 100%);
    --shadow-sm: 0 2px 10px rgba(30, 58, 95, 0.1);
    --shadow-md: 0 5px 25px rgba(30, 58, 95, 0.15);
    --shadow-lg: 0 10px 40px rgba(30, 58, 95, 0.2);
    --transition: all 0.3s ease;
}

/* =====================================================
   الأنماط العامة
   ===================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Cairo', sans-serif;
    line-height: 1.8;
    color: var(--text-dark);
    background-color: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.4;
}

a {
    text-decoration: none;
    transition: var(--transition);
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

img {
    max-width: 100%;
    height: auto;
}

/* =====================================================
   شريط التنقل
   ===================================================== */
.navbar {
    background: rgba(26, 95, 122, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: var(--primary-color);
    padding: 10px 0;
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--white) !important;
}

.navbar-brand i {
    color: var(--secondary-color);
}

.navbar-logo {
    width: 45px;
    height: 45px;
    object-fit: contain;
    border-radius: 50%;
    background: var(--white);
    padding: 3px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    padding: 8px 15px !important;
    margin: 0 3px;
    border-radius: 5px;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--white) !important;
    background: rgba(255, 255, 255, 0.15);
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

/* =====================================================
   قسم الهيرو
   ===================================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--gradient-primary);
    background-image: 
        linear-gradient(135deg, rgba(30, 58, 95, 0.95) 0%, rgba(46, 90, 143, 0.9) 100%),
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.03)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.03)"/><circle cx="50" cy="50" r="0.5" fill="rgba(255,255,255,0.02)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(201, 162, 39, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 20px;
    padding-top: 80px;
}

.university-logo {
    width: 140px;
    height: 140px;
    margin: 0 auto;
    margin-top: 30px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--secondary-color);
    animation: pulse 2s infinite;
    padding: 10px;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.3);
}

.university-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 50%;
}

.university-logo i {
    font-size: 3.5rem;
    color: var(--secondary-color);
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(201, 162, 39, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 20px rgba(201, 162, 39, 0);
    }
}

.conference-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.3);
    max-width: 900px;
    margin: 0 auto;
}

.conference-date {
    font-size: 1.5rem;
    color: var(--secondary-color);
    font-weight: 600;
}

.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-down a {
    color: var(--white);
    font-size: 2rem;
    opacity: 0.7;
    transition: var(--transition);
}

.scroll-down a:hover {
    opacity: 1;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-15px);
    }
    60% {
        transform: translateX(-50%) translateY(-10px);
    }
}

/* =====================================================
   عناوين الأقسام
   ===================================================== */
.section-header {
    margin-bottom: 50px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.title-underline {
    width: 80px;
    height: 4px;
    background: var(--gradient-secondary);
    margin: 0 auto;
    border-radius: 2px;
}

/* =====================================================
   قسم حول المؤتمر
   ===================================================== */
.about-card {
    background: var(--white);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.about-icon {
    width: 150px;
    height: 150px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.about-icon i {
    font-size: 4rem;
    color: var(--white);
}

/* =====================================================
   قسم الإحصائيات
   ===================================================== */
.stats-section {
    background: var(--gradient-primary);
    padding: 60px 0;
}

.stat-item {
    color: var(--white);
    padding: 20px;
}

.stat-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    border: 2px solid var(--secondary-color);
}

.stat-icon i {
    font-size: 2rem;
    color: var(--secondary-color);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* =====================================================
   قسم المحاور
   ===================================================== */
.topic-card {
    background: var(--white);
    border-radius: 15px;
    padding: 30px;
    height: 100%;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-top: 4px solid var(--primary-color);
}

.topic-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-top-color: var(--secondary-color);
}

.topic-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-primary);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    transition: var(--transition);
}

.topic-card:hover .topic-icon {
    background: var(--gradient-secondary);
    transform: rotateY(180deg);
}

.topic-icon i {
    font-size: 2rem;
    color: var(--white);
}

.topic-card h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.topic-card ul {
    padding-right: 0;
}

.topic-card li {
    position: relative;
    padding-right: 25px;
    margin-bottom: 12px;
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

.topic-card li::before {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 0;
    color: var(--secondary-color);
    font-size: 0.85rem;
}

/* =====================================================
   قسم شروط النشر
   ===================================================== */
.accordion-item {
    border: none;
    margin-bottom: 15px;
    border-radius: 10px !important;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.accordion-button {
    background: var(--white);
    font-weight: 600;
    color: var(--primary-color);
    padding: 20px 25px;
    font-size: 1.1rem;
}

.accordion-button:not(.collapsed) {
    background: var(--primary-color);
    color: var(--white);
}

.accordion-button:not(.collapsed) i {
    color: var(--secondary-color);
}

.accordion-button::after {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%231a5f7a'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
}

.accordion-button:not(.collapsed)::after {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23ffffff'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
}

.accordion-button:focus {
    box-shadow: none;
    border-color: transparent;
}

.accordion-body {
    padding: 25px;
    color: var(--text-light);
    background: var(--light-bg);
}

.accordion-body ul {
    margin: 0;
    padding-right: 0;
}

.accordion-body li {
    position: relative;
    padding-right: 25px;
    margin-bottom: 10px;
}

.accordion-body li::before {
    content: '\f058';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 0;
    color: var(--primary-color);
}

/* =====================================================
   قسم التواريخ المهمة
   ===================================================== */
.dates-section {
    background: var(--gradient-primary);
}

.timeline {
    position: relative;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    right: 50%;
    transform: translateX(50%);
    width: 4px;
    height: 100%;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
}

.timeline-item {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 40px;
    position: relative;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-icon {
    width: 60px;
    height: 60px;
    background: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    box-shadow: 0 0 0 5px rgba(201, 162, 39, 0.3);
}

.timeline-icon i {
    font-size: 1.5rem;
    color: var(--white);
}

.timeline-content {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 20px 30px;
    border-radius: 15px;
    margin-right: 30px;
    min-width: 300px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.timeline-content h4 {
    color: var(--white);
    margin-bottom: 5px;
    font-size: 1.1rem;
}

.timeline-content .date {
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 1.2rem;
    margin: 0;
}

/* =====================================================
   قسم التواصل
   ===================================================== */
.contact-card {
    background: var(--white);
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    height: 100%;
}

.contact-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.contact-avatar {
    width: 100px;
    height: 100px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.contact-avatar i {
    font-size: 2.5rem;
    color: var(--white);
}

.contact-card h4 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.contact-info {
    margin-bottom: 25px;
}

.info-item {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 10px;
}

.info-item i {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.info-item a {
    color: var(--text-dark);
    font-weight: 500;
    word-break: break-all;
}

.info-item a:hover {
    color: var(--primary-color);
}

.contact-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.contact-buttons .btn {
    padding: 8px 15px;
    font-size: 0.85rem;
    border-radius: 25px;
}

.university-info {
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
}

.university-badge {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.university-badge i {
    font-size: 2.5rem;
    color: var(--white);
}

/* =====================================================
   قسم العد التنازلي
   ===================================================== */
.countdown-section {
    background: var(--primary-dark);
}

.countdown-timer {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.countdown-item {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 25px 35px;
    border-radius: 15px;
    text-align: center;
    min-width: 120px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.countdown-value {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    color: var(--secondary-color);
    line-height: 1;
}

.countdown-label {
    display: block;
    color: var(--white);
    font-size: 1rem;
    margin-top: 10px;
    opacity: 0.9;
}

/* =====================================================
   الفوتر
   ===================================================== */
.footer {
    background: var(--text-dark);
    color: var(--white);
}

.footer p {
    color: rgba(255, 255, 255, 0.7);
}

.social-links {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--secondary-color);
    color: var(--white);
    transform: translateY(-3px);
}

/* اسم المبرمج */
.developer-credit {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.developer-credit strong {
    color: var(--secondary-color);
    font-weight: 700;
}

.developer-credit i {
    color: var(--secondary-color);
}

/* =====================================================
   زر العودة للأعلى
   ===================================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    left: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-5px);
}

/* =====================================================
   الاستجابة للشاشات المختلفة
   ===================================================== */
@media (max-width: 991px) {
    .navbar-collapse {
        position: fixed;
        top: 0;
        right: 0;
        width: 280px;
        height: 100vh;
        background: var(--primary-color);
        padding: 80px 25px 30px;
        margin: 0;
        border-radius: 0;
        box-shadow: -5px 0 30px rgba(0, 0, 0, 0.3);
        transform: translateX(100%);
        transition: transform 0.3s ease;
        z-index: 1050;
        overflow-y: auto;
    }
    
    .navbar-collapse.show {
        transform: translateX(0);
    }
    
    .navbar-nav {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
    
    .navbar-nav .nav-link {
        display: block;
        width: 100%;
        padding: 12px 20px !important;
        font-size: 1.1rem;
        border-radius: 10px;
        text-align: right;
    }
    
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
        background: rgba(255, 255, 255, 0.2);
    }
    
    /* خلفية معتمة عند فتح القائمة */
    .navbar-collapse.show::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 280px;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
    }
    
    .navbar-toggler {
        z-index: 1060;
    }

    .conference-title {
        font-size: 1.8rem;
    }

    .conference-date {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .timeline::before {
        right: 30px;
    }

    .timeline-item {
        flex-direction: row-reverse;
        justify-content: flex-end;
    }

    .timeline-content {
        margin-right: 20px;
        margin-left: 0;
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding-top: 100px;
    }

    .conference-title {
        font-size: 1.5rem;
    }

    .university-logo {
        width: 100px;
        height: 100px;
    }

    .university-logo i {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .about-card {
        padding: 25px;
    }

    .about-icon {
        width: 120px;
        height: 120px;
    }

    .about-icon i {
        font-size: 3rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .countdown-item {
        padding: 20px 25px;
        min-width: 100px;
    }

    .countdown-value {
        font-size: 2.5rem;
    }

    .timeline-content {
        min-width: auto;
        padding: 15px 20px;
    }

    .contact-card {
        padding: 30px 20px;
    }
}

@media (max-width: 576px) {
    .conference-title {
        font-size: 1.3rem;
    }

    .conference-fee .badge {
        font-size: 0.9rem !important;
        padding: 12px !important;
    }

    .topic-card {
        padding: 20px;
    }

    .topic-icon {
        width: 60px;
        height: 60px;
    }

    .topic-icon i {
        font-size: 1.5rem;
    }

    .countdown-timer {
        gap: 10px;
    }

    .countdown-item {
        padding: 15px 20px;
        min-width: 70px;
    }

    .countdown-value {
        font-size: 2rem;
    }

    .countdown-label {
        font-size: 0.85rem;
    }

    .back-to-top {
        bottom: 20px;
        left: 20px;
        width: 45px;
        height: 45px;
    }

    .info-item a {
        font-size: 0.9rem;
    }
}

/* =====================================================
   تأثيرات التمرير
   ===================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =====================================================
   تخصيص شريط التمرير
   ===================================================== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--light-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* =====================================================
   تحديد النص
   ===================================================== */
::selection {
    background: var(--primary-color);
    color: var(--white);
}

::-moz-selection {
    background: var(--primary-color);
    color: var(--white);
}

/* =====================================================
   قسم الفيديو
   ===================================================== */
.video-wrapper {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 5px solid var(--secondary-color);
    background: var(--primary-color);
}

.video-wrapper video {
    border-radius: 15px;
    display: block;
}

.video-wrapper iframe {
    border: none;
}

/* =====================================================
   سلايدر الصور
   ===================================================== */
#imageSlider {
    max-width: 900px;
    margin: 0 auto;
}

.carousel-inner {
    border-radius: 20px;
    overflow: hidden;
}

.slide-placeholder {
    height: 450px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--white);
    text-align: center;
    padding: 40px;
}

.slide-placeholder.slide-2 {
    background: linear-gradient(135deg, #c9a227 0%, #e8c547 100%);
}

.slide-placeholder.slide-3 {
    background: linear-gradient(135deg, #152a45 0%, #1e3a5f 100%);
}

.slide-placeholder.slide-4 {
    background: linear-gradient(135deg, #2e5a8f 0%, #4a7ab8 100%);
}

.slide-placeholder i {
    font-size: 5rem;
    margin-bottom: 25px;
    opacity: 0.9;
}

.slide-placeholder h4 {
    font-size: 2rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.slide-placeholder p {
    font-size: 1.3rem;
    opacity: 0.9;
}

.carousel-control-prev,
.carousel-control-next {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
    opacity: 1;
    transition: var(--transition);
}

.carousel-control-prev {
    right: -30px;
    left: auto;
}

.carousel-control-next {
    left: -30px;
    right: auto;
}

.carousel-control-prev:hover,
.carousel-control-next:hover {
    background: var(--secondary-color);
}

.carousel-indicators {
    bottom: -50px;
}

.carousel-indicators button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary-color);
    opacity: 0.5;
    border: none;
    margin: 0 5px;
}

.carousel-indicators button.active {
    opacity: 1;
    background: var(--secondary-color);
}

/* تجاوب السلايدر */
@media (max-width: 768px) {
    .slide-placeholder {
        height: 300px;
        padding: 30px;
    }
    
    .slide-placeholder i {
        font-size: 3rem;
    }
    
    .slide-placeholder h4 {
        font-size: 1.5rem;
    }
    
    .slide-placeholder p {
        font-size: 1rem;
    }
    
    .carousel-control-prev,
    .carousel-control-next {
        width: 45px;
        height: 45px;
    }
    
    .carousel-control-prev {
        right: 10px;
    }
    
    .carousel-control-next {
        left: 10px;
    }
}

@media (max-width: 576px) {
    .slide-placeholder {
        height: 250px;
    }
    
    .slide-placeholder i {
        font-size: 2.5rem;
        margin-bottom: 15px;
    }
    
    .slide-placeholder h4 {
        font-size: 1.2rem;
    }
}

/* =====================================================
   صور السلايدر
   ===================================================== */
.slider-image {
    width: 100%;
    height: auto;
    object-fit: cover;
    max-height: 500px;
}

@media (max-width: 768px) {
    .slider-image {
        max-height: 350px;
    }
}

@media (max-width: 576px) {
    .slider-image {
        max-height: 250px;
    }
}