:root {
        --primary-color: #2c3e50;
        --secondary-color: #3498db;
        --accent-color: #e74c3c;
        --light-color: #ecf0f1;
        --dark-color: #2c3e50;
        --text-color: #333;
        --text-light: #7f8c8d;
    }

    @font-face {
        font-family: 'Vazir';
        src: url('../fonts/vazir/webfonts/Vazirmatn-FD-Regular.woff2') format('woff2');
        font-weight: normal;
        font-style: normal;
        font-display: swap;
    }

    body {
        font-family: 'Vazir', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        color: var(--text-color);
        line-height: 1.8;
        overflow-x: hidden;
        padding-top: 80px;
    }

    /* Header Styles */
    .main-header {
        background-color: rgba(255, 255, 255, 0.95);
        box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
        transition: all 0.3s ease;
    }

    .main-header.scrolled {
        background-color: rgba(255, 255, 255, 0.98);
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
    }

    .navbar-brand img {
        height: 50px;
        transition: all 0.3s ease;
    }

    .nav-link {
        color: var(--dark-color);
        font-weight: 500;
        padding: 0.5rem 1rem;
        margin: 0 0.2rem;
        position: relative;
    }

    .nav-link:before {
        content: '';
        position: absolute;
        bottom: 0;
        right: 0;
        width: 0;
        height: 2px;
        background-color: var(--secondary-color);
        transition: width 0.3s ease;
    }

    .nav-link:hover:before,
    .nav-link.active:before {
        width: 100%;
        right: auto;
        left: 0;
    }

    /* Hero Section */
    .hero-section {
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
        color: white;
        padding: 100px 0;
        position: relative;
        overflow: hidden;
    }

    .hero-section:before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: url('images/hero-pattern.png') repeat;
        opacity: 0.1;
    }

    .hero-title {
        font-weight: 700;
        margin-bottom: 20px;
        animation: fadeInUp 1s ease;
    }

    .hero-subtitle {
        font-weight: 300;
        margin-bottom: 30px;
        animation: fadeInUp 1s ease 0.3s both;
    }

    /* Countdown */
    .countdown-container {
        background-color: rgba(255, 255, 255, 0.15);
        border-radius: 10px;
        padding: 20px;
        backdrop-filter: blur(5px);
    }

    .countdown-item {
        text-align: center;
        padding: 15px;
    }

    .countdown-number {
        font-size: 2.5rem;
        font-weight: 700;
        color: white;
        line-height: 1;
    }

    .countdown-label {
        font-size: 0.9rem;
        text-transform: uppercase;
        letter-spacing: 1px;
        opacity: 0.8;
    }

    /* Section Styles */
    .section {
        padding: 80px 0;
        position: relative;
    }

    .section-title {
        position: relative;
        margin-bottom: 50px;
        font-weight: 700;
        color: var(--primary-color);
    }

    /* .section-title:after {
      content: '';
      position: absolute;
      bottom: -15px;
      right: 0;
      width: 50px;
      height: 3px;
      background-color: var(--secondary-color);
    } */

    .section-title:after {
        content: '';
        position: absolute;
        bottom: -15px;
        left: 50%;
        transform: translateX(-50%);
        width: 50px;
        height: 3px;
        background-color: var(--secondary-color);
    }

    .section-subtitle {
        color: var(--text-light);
        margin-bottom: 30px;
    }

    /* Speakers */
    .speaker-card {
        border: none;
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        transition: all 0.3s ease;
        margin-bottom: 30px;
    }

    .speaker-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    }

    .speaker-img {
        height: 250px;
        object-fit: cover;
        object-position: top;
    }

    .speaker-social {
        list-style: none;
        padding: 0;
        margin: 15px 0 0;
    }

    .speaker-social li {
        display: inline-block;
        margin-left: 10px;
    }

    .speaker-social a {
        display: inline-block;
        width: 35px;
        height: 35px;
        line-height: 35px;
        text-align: center;
        background-color: var(--light-color);
        color: var(--dark-color);
        border-radius: 50%;
        transition: all 0.3s ease;
    }

    .speaker-social a:hover {
        background-color: var(--secondary-color);
        color: white;
    }

    /* Schedule */
    .schedule-tabs .nav-link {
        border: none;
        color: var(--text-light);
        font-weight: 600;
        padding: 12px 25px;
        margin-left: 5px;
    }

    .schedule-tabs .nav-link.active {
        color: var(--secondary-color);
        background-color: transparent;
        border-bottom: 3px solid var(--secondary-color);
    }

    .schedule-item {
        border-left: 3px solid var(--secondary-color);
        padding: 20px;
        margin-bottom: 20px;
        background-color: white;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        position: relative;
    }

    .schedule-time {
        color: var(--secondary-color);
        font-weight: 600;
    }

    .schedule-title {
        font-weight: 600;
        margin: 10px 0;
    }

    /* Gallery */
    .gallery-slider-container {
        position: relative;
        max-width: 100%;
        margin: 30px auto;
        padding: 0 40px;
    }

    .gallery-slider {
        display: flex;
        gap: 15px;
        overflow-x: auto;
        scroll-behavior: smooth;
        scrollbar-width: none;
        /* Hide scrollbar Firefox */
        -ms-overflow-style: none;
        /* Hide scrollbar IE/Edge */
    }

    .gallery-slider::-webkit-scrollbar {
        display: none;
        /* Hide scrollbar Chrome/Safari */
    }

    .slider-item {
        flex: 0 0 auto;
        width: 150px;
        height: 100px;
        border-radius: 8px;
        overflow: hidden;
        box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
        cursor: pointer;
        transition: transform 0.3s ease;
    }

    .slider-item:hover {
        transform: scale(1.05);
    }

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

    .slider-nav {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        width: 40px;
        height: 40px;
        background: rgba(255, 255, 255, 0.8);
        border: none;
        border-radius: 50%;
        color: var(--primary-color);
        font-size: 18px;
        cursor: pointer;
        z-index: 10;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }

    .slider-nav.prev {
        right: 0;
    }

    .slider-nav.next {
        left: 0;
    }

    .slider-nav:hover {
        background: var(--secondary-color);
        color: white;
    }

    /* Lightbox Overlay Styles */
    .lightbox-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.9);
        z-index: 1000;
        justify-content: center;
        align-items: center;
    }

    .lightbox-overlay.active {
        display: flex;
    }

    .overlay-image {
        max-width: 90%;
        max-height: 90%;
        object-fit: contain;
    }

    .close-overlay {
        position: absolute;
        top: 30px;
        right: 30px;
        color: white;
        font-size: 40px;
        cursor: pointer;
        transition: color 0.3s;
    }

    .close-overlay:hover {
        color: var(--secondary-color);
    }

    /* FAQ */
    .accordion-button {
        font-weight: 600;
        padding: 15px;
    }

    .accordion-button:not(.collapsed) {
        background-color: rgba(52, 152, 219, 0.1);
        color: var(--secondary-color);
    }

    .accordion-button:focus {
        box-shadow: none;
        border-color: rgba(52, 152, 219, 0.25);
    }

    /* Contact */
    .contact-info-item {
        display: flex;
        align-items: flex-start;
        margin-bottom: 20px;
    }

    .contact-info-icon {
        width: 40px;
        height: 40px;
        background-color: var(--secondary-color);
        color: white;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-left: 15px;
        flex-shrink: 0;
    }

    /* News Section Styles */
    .news-card {
        transition: all 0.3s ease;
        border-radius: 10px;
        overflow: hidden;
    }

    .news-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    }

    .badge-overlay {
        position: absolute;
        top: 15px;
        left: 15px;
        z-index: 2;
    }

    .date-overlay {
        position: absolute;
        bottom: 15px;
        left: 15px;
        background-color: var(--primary-color);
        color: white;
        width: 50px;
        height: 50px;
        border-radius: 50%;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        z-index: 2;
    }

    .date-day {
        font-weight: 700;
        font-size: 1.2rem;
        line-height: 1;
    }

    .date-month {
        font-size: 0.7rem;
        line-height: 1;
    }

    .news-card .card-img-top {
        height: 200px;
        object-fit: cover;
        transition: all 0.5s ease;
    }

    .news-card:hover .card-img-top {
        transform: scale(1.05);
    }

    .news-meta {
        font-size: 0.85rem;
    }

    /* Footer */
    .footer {
        background-color: var(--dark-color);
        color: white;
        padding: 60px 0 0;
    }

    .footer-title {
        position: relative;
        margin-bottom: 25px;
        padding-bottom: 15px;
    }

    .footer-title:after {
        content: '';
        position: absolute;
        bottom: 0;
        right: 0;
        width: 50px;
        height: 2px;
        background-color: var(--secondary-color);
    }

    .footer-links li {
        margin-bottom: 10px;
    }

    .footer-links a {
        color: rgba(255, 255, 255, 0.7);
        transition: all 0.3s ease;
        text-decoration: none;
    }

    .footer-links a:hover {
        color: white;
        padding-right: 10px;
    }

    .social-links a {
        display: inline-block;
        width: 40px;
        height: 40px;
        line-height: 40px;
        text-align: center;
        background-color: rgba(255, 255, 255, 0.1);
        color: white;
        border-radius: 50%;
        margin-left: 10px;
        transition: all 0.3s ease;
    }

    .social-links a:hover {
        background-color: var(--secondary-color);
        transform: translateY(-5px);
    }

    .footer-bottom {
        /* background-color: rgba(0, 0, 0, 0.2); */
        padding: 20px 0;
        margin-top: 40px;
    }

    .footer-bottom a {
        text-decoration: none;
    }

    /* Back to top */
    .back-to-top {
        position: fixed;
        bottom: 30px;
        left: 30px;
        width: 50px;
        height: 50px;
        line-height: 50px;
        text-align: center;
        background-color: var(--secondary-color);
        color: white;
        border-radius: 50%;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 999;
    }

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

    .back-to-top:hover {
        background-color: var(--primary-color);
    }

    /* Animations */
    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(20px);
        }

        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* Responsive */
    @media (max-width: 991.98px) {
        body {
            padding-top: 70px;
        }

        .navbar-collapse {
            background-color: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            margin-top: 15px;
        }
    }

    @media (max-width: 767.98px) {
        .section {
            padding: 60px 0;
        }

        .hero-section {
            padding: 80px 0;
        }

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