/* Base Reset & Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #0b0f19;       /* Deep matte black/navy */
    --text-main: #f3f4f6;      /* Off-white */
    --text-muted: #9ca3af;     /* Medium gray */
    --accent-blue: #3b82f6;     /* Electric/Royal blue */
    --border-gray: #1f2937;    /* Dark gray for structural borders */
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
}

/* Container wrapper to restrict max width on huge screens */
.wrapper {
    max-width: 900px;
    margin: 0 auto;
    border-left: 1px solid var(--border-gray);
    border-right: 1px solid var(--border-gray);
    min-height: 100vh;
    background-color: #0d1321;
}

/* Header Image Section */
header {
    width: 100%;
    height: 220px;
    background-image: url('media/banner.png');
    background-size: cover;
    background-position: center;
    position: relative;
    border-bottom: 1px solid var(--border-gray);
}

/* Navigation Bar */
nav {
    background-color: #070a12;
    border-bottom: 1px solid var(--border-gray);
    display: flex;
    justify-content: center;
}

nav ul {
    list-style: none;
    display: flex;
    width: 100%;
    max-width: 600px;
}

nav ul li {
    flex: 1;
    text-align: center;
}

nav ul li a {
    display: block;
    padding: 14px 0;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color 0.2s, background-color 0.2s;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--accent-blue);
    background-color: rgba(59, 130, 246, 0.05);
}

/* Main Content Layout */
main {
    padding: 40px;
}

/* Profile Block */
.profile-section {
    display: flex;
    gap: 30px;
    align-items: flex-start;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-gray);
}

.profile-photo {
    width: 180px;
    height: 180px;
    border-radius: 6px;
    object-fit: cover;
    border: 2px solid var(--border-gray);
    background-color: #1e293b; /* Placeholder color before uploading image */
    flex-shrink: 0;
}

.profile-text h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 8px;
    color: var(--text-main);
}

.profile-text .subtitle {
    font-size: 1.15rem;
    color: var(--accent-blue);
    font-weight: 500;
    margin-bottom: 16px;
}

.profile-text p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* Generic Content Sections below */
.content-section {
    margin-bottom: 40px;
}

.content-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-main);
    border-left: 4px solid var(--accent-blue);
    padding-left: 12px;
}

.publication-card {
    background-color: #111827;
    border: 1px solid var(--border-gray);
    padding: 24px;
    border-radius: 6px;
}

.publication-card h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
    color: var(--text-main);
}

.publication-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Responsive Breakpoint for Small Screens */
@media (max-width: 640px) {
    .profile-section {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    main {
        padding: 20px;
    }
    nav ul li a {
        font-size: 0.8rem;
        padding: 12px 0;
    }
    .content-section h2 {
        font-size: 1.25rem;
    }
}