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

:root {
    /* Balanced Green–Mint Theme */

    --primary-color: #2c705a;
    --secondary-color: #43a047;
    --accent-color: #66bb6a;

    --text-color: #2e3d39;
    --light-bg: #e8f7f1;
    --white: #ffffff;

    --gray: #6c757d;
    --light-gray: #d8ece5;

    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent-color);
}

/* Navigation */
.navbar {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--box-shadow);
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--white);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

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

.nav-link {
    color: var(--white);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 5rem 0;
    text-align: center;
}

.hero .container {
    text-align: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    width: 100%;
}

.hero-image img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    border: 5px solid var(--white);
    box-shadow: var(--box-shadow);
    object-fit: cover;
}

.hero-text {
    width: 100%;
    text-align: center;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.hero-text h2 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.hero-affiliation {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

/* Hero Social Links */
.hero .social-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    font-size: 1.5rem;
    width: max-content;
    max-width: 100%;
    margin: 1.5rem auto 0 auto;
    padding: 0;
}

.hero .social-links a {
    color: var(--white);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.hero .social-links a:hover {
    background-color: var(--white);
    color: var(--secondary-color);
    transform: translateY(-3px);
}

/* Sections */
.section {
    padding: 5rem 0;
}

.section-alt {
    background-color: var(--light-bg);
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.section-intro {
    text-align: center;
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 800px;
    margin: 0 auto 3rem;
}

/* About Section */
.about-content {
    max-width: 900px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-content p {
    margin-bottom: 1.5rem;
}

.highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.highlight-item {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.highlight-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.highlight-item i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.highlight-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.highlight-item ul {
    list-style: none;
}

.highlight-item li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--light-gray);
}

.highlight-item li:last-child {
    border-bottom: none;
}

/* Research Section */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.research-item {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.research-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.research-icon {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.research-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Publications Section */
.publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.publication-year {
    margin-bottom: 3rem;
}

.publication-year h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    border-bottom: 3px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.publication-item {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.publication-item:hover {
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.pub-authors {
    color: var(--gray);
    margin-bottom: 0.5rem;
}

.pub-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.pub-venue {
    color: var(--gray);
    margin-bottom: 1rem;
}

.pub-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.4rem 0.8rem;
    background-color: var(--secondary-color);
    color: var(--white);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    transition: var(--transition);
}

.pub-link:hover {
    background-color: var(--accent-color);
    color: var(--white);
}

/* Teaching Section */
.teaching-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.course-item {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.course-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.course-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.course-level {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 0.3rem 0.8rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.course-semester {
    color: var(--gray);
    font-size: 0.9rem;
    margin-top: 1rem;
}

.mentoring {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 800px;
    margin: 0 auto;
}

.mentoring h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.mentoring ul {
    list-style: none;
    margin-top: 1rem;
}

.mentoring li {
    padding: 0.5rem 0;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    align-items: start;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-top: 0.3rem;
    min-width: 30px;
}

.contact-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.3rem;
}

.office-hours {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.office-hours h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
}

.footer p {
    margin: 0.5rem 0;
    opacity: 0.9;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--primary-color);
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
        display: none;
    }

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

    .nav-link {
        padding: 1rem 2rem;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-text h2 {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .highlights {
        grid-template-columns: 1fr;
    }

    .research-grid {
        grid-template-columns: 1fr;
    }

    .teaching-grid {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 3rem 0;
    }

    .section {
        padding: 3rem 0;
    }
}

@media (max-width: 480px) {
    .hero-image img {
        width: 200px;
        height: 200px;
    }

    .hero .social-links {
        gap: 0.8rem;
    }

    .hero .social-links a {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}