body {
    font-family: Arial, sans-serif;
    line-height: 1.25;
    font-size: 18px;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: white;
}

.header {
    background-image: url('../images/background_image.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 115px 20px 95px 20px;
    text-align: center;
    position: relative;
}

.navbar {
    position: absolute;
    top: 20px;
    right: 120px;
}

.navbar ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 20px;
}

.navbar ul li a {
    color: white;
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
}

.title-section h1 {
    margin: 0;
    font-size: 24px;
}

.title-section h2 {
    margin: 0;
    font-size: 36px;
    margin-top: 10px;
}

.title-section h3 {
    margin: 0;
    font-size: 20px;
    margin-top: 10px;
}

.content {
    background-color: white;
    padding: 10px 120px;
    margin-top: 0px;
    text-align: justify;
}

h4 {
    color: #003366;
    font-size: 28px;
    margin-top: 20px;
    margin-bottom: 20px;
}

.introduction ul {
    padding-left: 25px;
}

.introduction a,
.introduction a:hover,
.introduction a:visited,
.important-dates a,
.important-dates a:hover,
.important-dates a:visited {
    color: #336699;
}

.important-dates ul {
    padding-left: 25px;
}

.registration {
    margin-bottom: 10px;
}

.speakers-grid {
    display: grid;
    gap: 0px 30px;
    grid-template-columns: repeat(5, 1fr); /* 5 columns for invited speakers */
}

.organizers-grid {
    display: grid;
    gap: 0px 30px;
    grid-template-columns: repeat(5, 1fr); /* 5 columns for organizers */
}

.speaker,
.organizer {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.speaker img,
.organizer img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    object-fit: cover;
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

.speaker h5,
.organizer h5 {
    font-size: 20px;
    margin: 10px 0 -10px 0;
    text-align: center;
}

.speaker a,
.organizer a,
.speaker a:visited,
.organizer a:visited {
    text-decoration: none;
    color: #336699;
}

.speaker p,
.organizer p {
    font-size: 18px;
    color: #666;
    text-align: center;
}

.section-divider {
    border: 0;
    height: 2px;
    background-color: #ddd;
    margin: 20px 0 0 0;
}

.sponsor-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 50px;
}

.sponsor-row {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.sponsor-logo-large {
    max-width: 400px;
    height: auto;
}

.sponsor-logo {
    height: 65px;
    width: auto;
    margin: 20px 30px;
}

@media (max-width: 768px) {
    .header {
        padding: 60px 20px;
        text-align: center;
    }

    .navbar {
        position: static;
        margin-bottom: 20px;
        text-align: left;
    }

    .navbar ul {
        flex-direction: column;
        align-items: left;
        gap: 15px;
    }

    .navbar ul li a {
        font-size: 16px;
    }

    .title-section h1 {
        font-size: 18px;
    }

    .title-section h2 {
        font-size: 32px;
    }

    .title-section h3 {
        font-size: 18px;
    }

    h4 {
        color: #003366;
        font-size: 24px;
    }

    .content {
        padding: 10px 40px;
    }

    .speakers-grid,
    .organizers-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 5px 25px;
    }

    .sponsor-logo-large {
        max-width: 300px;
    }

    .sponsor-logo {
        height: 50px;
        margin: 20px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 50px 20px;
        text-align: center;
    }

    .navbar ul {
        flex-direction: column;
        align-items: left;
        gap: 5px 10px;
    }

    .navbar ul li a {
        font-size: 16px;
    }

    .title-section h1 {
        font-size: 18px;
    }

    .title-section h2 {
        font-size: 28px;
    }

    .title-section h3 {
        font-size: 18px;
    }

    h4 {
        color: #003366;
        font-size: 20px;
    }

    .content {
        padding: 10px 20px;
    }

    .speakers-grid,
    .organizers-grid {
        gap: 5px 15px;
        grid-template-columns: repeat(2, 1fr); /* 2 columns */
    }

    .sponsor-logo-large {
        max-width: 250px;
    }

    .sponsor-logo {
        height: 40px;
        margin: 10px;
    }
}