:root {
    --primary-color: #ff8c00; /* Orange */
    --secondary-color: #d35400; /* Darker orange for accents */
    --light-color: #fff5ec; /* Light orange tint for background */
    --dark-color: #333333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
    max-width: 1000px;
    width: 100%;
    margin: auto;
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
    padding: 20px 20px;
}

main {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    margin: auto;
}

.header-content {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.profile-img {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    border: 4px solid white;
    object-fit: cover;
    background-color: #ccc;
    margin-right: 30px;
}

.header-text {
    text-align: left;
}

.header-text h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.header-text p {
    font-size: 1.2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 20px;
}

section {
    margin-bottom: 60px;
}

h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--secondary-color);
    position: relative;
    padding-bottom: 10px;
}

h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    height: 3px;
    width: 60px;
    background-color: var(--primary-color);
}

.about-content {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    align-items: center;
}

.about-text {
    flex: 1;
    min-width: 300px;
}

.research, .achievements-list {
    background-color: white;
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    margin-bottom: 40px;
}

.research h3, .achievements-list h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
}


.research-container {
    max-width: 800px;
    background: white;
    padding: 25px;
    box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
}

.research-title {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    border-bottom: 2px solid #ddd;
    padding-bottom: 5px;
    margin-bottom: 15px;
}

.research-list {
    padding-left: 20px;
}

.research-list li {
    margin-bottom: 10px;
}

.papers-list {
    list-style: none;
    padding: 0;
    width: 300px;
}

.papers-list li {
    font-size: 11px;
    color: black;
    padding: 5px;
    margin: 10px 0;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
}

.paper-year {
    border-bottom: 2px solid #ddd;
}

footer {
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    padding: 30px 20px;
}

.social-links {
    margin-top: 20px;
}

.social-links a {
    color: white;
    margin: 0 10px;
    font-size: 1.2rem;
    text-decoration: none;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .profile-img {
        margin-right: 0;
        margin-bottom: 20px;
    }
    
    .header-text {
        text-align: center;
    }
    
    .about-content {
        flex-direction: column;
        text-align: center;
    }
    
    h2::after {
        left: 50%;
        transform: translateX(-50%);
    }
}