:root {
    --primary-blue: #0e6ed4;
    --text-color: #000000;
    --bg-color: #ffffff;
    --border-color: #000000;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

a {
    color: var(--primary-blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Header & Nav */
header {
    background-color: var(--primary-blue);
    color: var(--bg-color);
    padding: 1rem 0;
    border-bottom: 2px solid var(--text-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.container {
    width: 80%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo a {
    color: var(--bg-color);
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 10px 0 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

nav a {
    color: var(--bg-color);
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px solid transparent;
}

nav a:hover,
nav a.active {
    background-color: var(--bg-color);
    color: var(--primary-blue);
    text-decoration: none;
    border: 1px solid var(--bg-color);
}

/* Main Content */
main {
    padding: 2rem 0;
    min-height: 80vh;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--primary-blue);
}

h2 {
    border-bottom: 2px solid var(--primary-blue);
    padding-bottom: 5px;
    display: inline-block;
}

/* Base list styling for items */
.item-list {
    list-style: none;
    padding: 0;
}

.item-card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 15px;
    margin-bottom: 15px;
    /* border-left: 5px solid var(--primary-blue); Removed extra decor to simplify */
    border-left: 5px solid var(--primary-blue);
    /* Kept as it is "Blue" */
}

/* Publication specific */
.publication-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.publication-content {
    flex: 1;
}

.publication-image img {
    max-width: 175px;
    height: auto;
    border: 1px solid var(--border-color);
}

.meta {
    font-size: 0.9em;
    color: var(--text-color);
    margin: 5px 0;
    font-style: italic;
}

.abstract {
    margin-top: 10px;
    font-size: 0.95em;
    color: var(--text-color);
    line-height: 1.5;
}

/* Grid for Books */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 15px;
    text-align: center;
}

.card img {
    max-width: 100%;
    height: auto;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
}

/* Subsections for Code */
.subsection {
    margin-bottom: 2rem;
}

.subsection h3 {
    font-size: 1.2rem;
    border-bottom: null;
    background-color: transparent;
    padding: 0;
    border-left: none;
    color: var(--primary-blue);
    text-decoration: underline;
}

/* Hero Section (Home) */
.hero {
    display: flex;
    align-items: center;
    gap: 30px;
    background: var(--bg-color);
    padding: 30px;
    border: 1px solid var(--border-color);
    /* border-top: 5px solid var(--primary-blue); */
}

.profile-photo img {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: 50%;
    /* Circle is fine */
    border: 4px solid var(--primary-blue);
}

/* Footer */
footer {
    background-color: var(--text-color);
    /* Black */
    color: var(--bg-color);
    /* White */
    text-align: center;
    padding: 1rem 0;
    margin-top: auto;
    border-top: none;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }

    nav ul {
        justify-content: center;
    }

    .container {
        width: 90%;
    }
}