/* ================= GLOBAL RESET ================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    line-height: 1.6;
    background-color: #f9fafc;
    color: #333;
}

/* ================= NAVBAR ================= */
header {
    background-color: #1e3a5f;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    width: 90%;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: white;
    font-weight: 600;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 25px;
}

.nav-links a {
    text-decoration: none;
    color: white;
    font-weight: 500;
    transition: 0.3s;
}

.nav-links a:hover {
    color: #ffd166;
}

/* ================= HERO SECTION ================= */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    background: linear-gradient(to right, #1e3a5f, #2a5298);
    color: white;
    padding: 60px 10%;
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 40px;
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 15px;
}

.hero-text p {
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.hero-image img {
    width: 280px;
    height: 280px;
    object-fit: cover;
    border-radius: 50%;
    border: 5px solid white;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

/* ================= BUTTON ================= */
.btn {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 25px;
    background-color: #ffd166;
    color: #333;
    text-decoration: none;
    border-radius: 25px;
    font-weight: bold;
    transition: 0.3s;
}

.btn:hover {
    background-color: white;
}

/* ================= SECTIONS ================= */
.section {
    padding: 70px 10%;
    text-align: center;
}

.section h2 {
    margin-bottom: 30px;
    font-size: 2rem;
}

.alt {
    background-color: #eef2f7;
}

/* ================= CARD LAYOUT ================= */
.card-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.card {
    background: white;
    padding: 25px;
    width: 300px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: 0.3s ease;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.card h3 {
    margin-bottom: 10px;
    color: #1e3a5f;
}

/* ================= PUBLICATIONS ================= */
.publication-list {
    list-style: none;
    max-width: 900px;
    margin: auto;
    text-align: left;
}

.publication-list li {
    margin-bottom: 15px;
    padding-left: 10px;
}

.publication-list em a {
    color: #1e3a5f;
    text-decoration: none;
}

.publication-list em a:hover {
    text-decoration: underline;
}

/* ================= CONTACT LINKS ================= */
a {
    color: #1e3a5f;
}

a:hover {
    color: #2a5298;
}

/* ================= FOOTER ================= */
footer {
    background-color: #1e3a5f;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}

/* ================= RESPONSIVE ================= */
@media (max-width: 768px) {

    .navbar {
        flex-direction: column;
        gap: 15px;
    }

    .nav-links {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }

    .hero-container {
        flex-direction: column;
        text-align: center;
    }

    .hero-image img {
        width: 200px;
        height: 200px;
    }

    .card-container {
        flex-direction: column;
        align-items: center;
    }

    .card {
        width: 90%;
    }
}