/* General Body & Typography */
body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: #fdfdfd;
    color: #333;
    font-weight: 300;
}

.container {
    width: 85%;
    max-width: 1100px;
    margin: auto;
    overflow: hidden;
    padding: 0 20px;
}

h1, h2, h3 {
    font-family: 'Merriweather', serif;
    font-weight: 700;
    color: #333;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    text-align: center;
    border-bottom: 2px solid #A51C30; /* Harvard Crimson Accent */
    padding-bottom: 10px;
    display: inline-block;
}

.content-section h2 {
    display: block;
    text-align: center;
    border-bottom: 2px solid #A51C30;
    margin-bottom: 40px;
}

p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

/* Header & Navigation */
#navbar {
    background: #fff;
    color: #333;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: top 0.3s;
}

#navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#navbar .logo {
    font-size: 1.5rem;
    margin: 0;
    color: #A51C30;
}

#navbar nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

#navbar nav ul li {
    margin-left: 25px;
}

#navbar nav ul li a {
    color: #333;
    text-decoration: none;
    font-weight: 700;
    transition: color 0.3s;
}

#navbar nav ul li a:hover {
    color: #A51C30;
}

/* Hero Section */
#hero {
    background: #f4f4f4;
    color: #333;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.hero-content .profile-photo {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    border: 5px solid #A51C30;
    margin-bottom: 20px;
    object-fit: cover;
}

.hero-content h2 {
    font-size: 3.5rem;
    margin: 0;
    border: none;
}

.hero-content .tagline {
    font-size: 1.5rem;
    color: #555;
    margin-top: 10px;
}

.cta-buttons {
    margin-top: 30px;
}

.btn {
    display: inline-block;
    background: #A51C30;
    color: #fff;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 700;
    transition: background 0.3s, transform 0.2s;
    margin: 0 10px;
}

.btn:hover {
    background: #841626;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #555;
}

.btn-secondary:hover {
    background: #333;
}

/* Content Sections */
.content-section {
    padding: 80px 0;
    text-align: center;
}

.bg-light {
    background: #f9f9f9;
}

#about p {
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
    font-size: 1.2rem;
}

/* Education */
.education-item {
    margin-bottom: 30px;
    text-align: left;
    padding: 20px;
    border-left: 4px solid #A51C30;
    background: #fff;
}
.education-item h3 { margin-top: 0; }
.education-item p { margin-bottom: 5px; }


/* Card Grid for Research/Projects */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    text-align: left;
}

.card {
    background: #fff;
    padding: 25px;
    border-radius: 5px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.card h3 {
    color: #A51C30;
    margin-top: 0;
}

.card q {
    display: block;
    margin-top: 15px;
    font-style: italic;
    color: #555;
    border-left: 3px solid #ccc;
    padding-left: 15px;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    text-align: left;
    max-width: 900px;
    margin: 0 auto;
}

.skill-category h3 {
    color: #A51C30;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
}

.skill-category ul {
    list-style: none;
    padding: 0;
}

.skill-category ul li {
    background: #fff;
    padding: 10px;
    margin-bottom: 8px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

/* Certifications */
.cert-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    max-width: 900px;
    margin: auto;
}
.cert-item {
    background: #A51C30;
    color: white;
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: bold;
}

/* Experience */
.experience-item {
    text-align: left;
    max-width: 800px;
    margin: 0 auto;
    background: #fff;
    padding: 25px;
    border-left: 4px solid #A51C30;
}
.experience-item h3 { margin-top: 0; }

/* Footer */
#contact {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 60px 0;
}

#contact h2 {
    color: #fff;
    border-bottom-color: #A51C30;
}

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

.social-links a {
    color: #fff;
    text-decoration: none;
    margin: 0 15px;
    font-size: 1.2rem;
    transition: color 0.3s;
}

.social-links a:hover {
    color: #A51C30;
}

.copyright {
    margin-top: 30px;
    font-size: 0.9rem;
    color: #aaa;
}


/* Responsive Design */
@media(max-width: 768px) {
    #navbar .container {
        flex-direction: column;
    }
    #navbar .logo {
        margin-bottom: 10px;
    }
    #navbar nav ul {
        flex-direction: column;
        align-items: center;
    }
    #navbar nav ul li {
        margin: 10px 0;
    }
    
    #hero {
        padding-top: 150px; /* Adjust for fixed nav */
        height: auto;
    }

    .hero-content h2 {
        font-size: 2.5rem;
    }
    .hero-content .tagline {
        font-size: 1.2rem;
    }
    
    h2 {
        font-size: 2rem;
    }
}