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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f9fafb;
    --border-color: #e5e7eb;
}

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

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

/* Header Styles */
header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

nav {
    padding: 1rem 0;
}

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

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
    padding: 3rem 0;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    margin-bottom: 3rem;
}

.hero-tagline {
    font-size: 1.5rem;
    opacity: 0.95;
    margin-bottom: 0;
}

.page-layout {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 4rem;
    display: flex;
    gap: 3rem;
}

.sidebar-nav {
    flex: 0 0 240px;
    position: sticky;
    top: 120px;
    align-self: flex-start;
}

.sidebar-nav nav {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 15px 35px rgba(15, 23, 42, 0.1);
}

.sidebar-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sidebar-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    padding: 0.35rem 0.5rem;
    border-left: 3px solid transparent;
    transition: color 0.3s ease, border-color 0.3s ease;
}

.sidebar-nav a:hover,
.sidebar-nav a:focus {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.content-area {
    flex: 1;
    min-width: 0;
}

/* Content Sections */
section {
    margin-bottom: 3rem;
}

h1, h2, h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.education-entry + .education-entry {
    margin-top: 2rem;
}

.education-entry h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.education-entry p {
    margin-bottom: 0.5rem;
}

.history-entry + .history-entry {
    margin-top: 2rem;
}

.history-entry h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.history-entry p {
    margin-bottom: 0.5rem;
}

.funding-entry + .funding-entry {
    margin-top: 2rem;
}

.funding-entry h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.funding-entry p {
    margin-bottom: 0.5rem;
}

.honors-entry + .honors-entry {
    margin-top: 1.5rem;
}

.honors-entry h3 {
    font-size: 1.15rem;
    margin-bottom: 0.25rem;
}

.honors-entry p {
    margin-bottom: 0.5rem;
}

.career-entry + .career-entry {
    margin-top: 2rem;
}

.career-entry h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.career-entry p {
    margin-bottom: 0.5rem;
}

.career-entry ul {
    margin-left: 1.25rem;
    color: var(--text-light);
}

.career-entry li {
    margin-bottom: 0.5rem;
}

.assignment-entry + .assignment-entry {
    margin-top: 2rem;
}

.assignment-entry h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.assignment-entry p {
    margin-bottom: 0.5rem;
}

.software-entry + .software-entry {
    margin-top: 1.5rem;
}

.software-entry h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.software-entry a {
    color: var(--primary-color);
    text-decoration: underline;
}

.software-entry a:hover {
    color: var(--secondary-color);
}

.software-entry p {
    margin-bottom: 0.5rem;
}

.links-entry + .links-entry {
    margin-top: 1.5rem;
}

.links-entry h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.links-entry a {
    color: var(--primary-color);
    text-decoration: underline;
}

.links-entry a:hover {
    color: var(--secondary-color);
}

.links-entry p {
    margin-bottom: 0.5rem;
}

.publication-entry + .publication-entry {
    margin-top: 1.5rem;
}

.publication-entry p {
    margin-bottom: 0.75rem;
}

.publication-entry a {
    color: var(--primary-color);
    text-decoration: underline;
}

.publication-entry a:hover {
    color: var(--secondary-color);
}

/* Footer */
footer {
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

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

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .page-layout {
        flex-direction: column;
        padding-bottom: 3rem;
    }

    .sidebar-nav {
        position: static;
        width: 100%;
    }

    .sidebar-nav nav {
        padding: 1rem;
    }

    .sidebar-nav ul {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    .sidebar-nav a {
        border-left: none;
        border-radius: 999px;
        background: var(--bg-light);
        padding: 0.5rem 1rem;
    }

    .sidebar-nav a:hover,
    .sidebar-nav a:focus {
        border-color: transparent;
        background: var(--primary-color);
        color: #fff;
    }
}

@media (max-width: 768px) {
    .nav-links {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-tagline {
        font-size: 1.2rem;
    }

    footer .container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}