/* Reset and Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: #007bff;
    transition: color 0.3s;
}

a:hover {
    color: #0056b3;
}

ul {
    list-style: none;
}

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

/* Header & Navigation */
header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: #555;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 4px;
}

.nav-links a:hover, .nav-links a.active {
    background-color: #f0f0f0;
    color: #2c3e50;
}

/* Mobile Menu Button (Hidden by default) */
.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Main Content */
main {
    flex: 1;
    padding: 40px 0;
}

h1, h2, h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

section {
    margin-bottom: 40px;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.section-title {
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

/* Footer */
footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 20px 0;
    text-align: center;
    margin-top: auto;
}

footer p {
    margin-bottom: 10px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        padding: 20px;
        text-align: center;
    }

    .nav-links.active {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }
}

/* Utility Classes */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #007bff;
    color: #fff;
    border-radius: 4px;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #0056b3;
    color: #fff;
}

/* Specific Page Styles - Home */
.hero {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 8px;
    margin-bottom: 40px;
}

.news-list .news-item {
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

.news-item .date {
    color: #777;
    font-size: 0.9rem;
    margin-right: 10px;
}

/* Members Grid */
.members-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
}

.member-card {
    background: #fff;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    transition: transform 0.2s;
}

.member-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.member-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background-color: #ddd;
    margin: 0 auto 15px;
    object-fit: cover;
}

/* Publications List */
.publication-item {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.publication-title {
    font-weight: bold;
    font-size: 1.1rem;
}

.publication-authors {
    color: #555;
}

.publication-venue {
    font-style: italic;
    color: #007bff;
}