:root {
    --bg-color: #0a192f;
    --text-main: #ccd6f6;
    --text-muted: #8892b0;
    --accent: #64ffda;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Dynamic Background */
.background-animation {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(100, 255, 218, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(10, 25, 47, 1) 0%, transparent 50%);
    z-index: -1;
    animation: rotateBg 30s linear infinite;
}

@keyframes rotateBg {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Glassmorphism utility */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 2rem;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.glass:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
}

/* Navigation */
#navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.5rem 2rem;
    background: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    z-index: 100;
    transition: transform 0.3s ease;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--accent);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 2px;
}

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

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

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

/* Sections */
.section {
    max-width: 1000px;
    margin: 0 auto;
    padding: 100px 20px;
}

.section-title {
    display: flex;
    align-items: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--text-main);
}

.section-title::after {
    content: "";
    flex-grow: 1;
    height: 1px;
    background: var(--glass-border);
    margin-left: 1.5rem;
}

.section-title span {
    color: var(--text-main);
}
.section-title {
    color: var(--accent);
}

/* Hero */
#hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 20px;
}

.hero-content {
    max-width: 1000px;
    width: 100%;
}

.greeting {
    color: var(--accent);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 400;
}

.name {
    font-size: clamp(40px, 8vw, 80px);
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.1;
    margin-bottom: 0.5rem;
}

.role {
    font-size: clamp(30px, 6vw, 60px);
    font-weight: 800;
    color: var(--text-muted);
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.summary {
    color: var(--text-muted);
    max-width: 600px;
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.btn {
    display: inline-block;
    padding: 1rem 1.75rem;
    border-radius: 4px;
    text-decoration: none;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.primary-btn {
    color: var(--accent);
    background: transparent;
    border: 1px solid var(--accent);
}

.primary-btn:hover {
    background: rgba(100, 255, 218, 0.1);
}

.hero-btns {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.secondary-btn {
    color: var(--text-main);
    background: transparent;
    border: 1px solid var(--glass-border);
}

.secondary-btn:hover {
    background: var(--glass-bg);
    border-color: var(--text-main);
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 3rem;
}

.about-text p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.education-cards {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.education-cards h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

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

.date {
    display: block;
    margin-top: 1rem;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
}

/* Skills */
.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category h3 {
    margin-bottom: 1.5rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.skill-category h3 i {
    color: var(--accent);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-tags span {
    background: rgba(100, 255, 218, 0.1);
    color: var(--accent);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* Timeline */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 0;
    height: 100%;
    width: 2px;
    background: var(--glass-border);
}

.timeline-item {
    position: relative;
    padding-left: 4rem;
    border: none;
    background: transparent;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 1.1rem;
    top: 1.5rem;
    width: 1rem;
    height: 1rem;
    background: var(--bg-color);
    border: 2px solid var(--accent);
    border-radius: 50%;
    z-index: 1;
}

.timeline-date {
    color: var(--accent);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.timeline-content h3 {
    color: var(--text-main);
    margin-bottom: 0.25rem;
}

.timeline-content h4 {
    color: var(--text-muted);
    font-weight: 400;
    margin-bottom: 1rem;
}

.timeline-content p {
    color: var(--text-muted);
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card h3 {
    color: var(--text-main);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.project-card p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    color: var(--accent);
    font-size: 0.85rem;
}

/* Publications */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.publication-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
}

.pub-icon {
    font-size: 2rem;
    color: var(--accent);
}

.pub-details h3 {
    color: var(--text-main);
    font-size: 1.1rem;
    font-weight: 600;
}

.hover-glow:hover {
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.2);
}

.doc-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.8rem;
    margin-top: 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
    background: rgba(100, 255, 218, 0.08);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.doc-btn:hover {
    background: rgba(100, 255, 218, 0.2);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.doc-btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 3rem 2rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.social-links a {
    color: var(--text-muted);
    font-size: 1.5rem;
    transition: color 0.3s ease, transform 0.3s ease;
}

.social-links a:hover {
    color: var(--accent);
    transform: translateY(-3px);
}

footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
    .nav-links {
        display: none;
    }
}

/* Modal Overlay & Card */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    position: relative;
    max-width: 500px;
    width: 90%;
    background: rgba(16, 37, 66, 0.95);
    border: 1px solid var(--accent);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 20px rgba(100, 255, 218, 0.15);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1.25rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.75rem;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close-modal:hover {
    color: var(--accent);
}

.modal-title {
    color: var(--accent);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-icon {
    font-size: 1.4rem;
    color: var(--accent);
    margin-top: 0.25rem;
}

.contact-info-item h4 {
    color: var(--text-main);
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.contact-info-item p a {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.95rem;
    transition: underline 0.2s ease;
}

.contact-info-item p a:hover {
    text-decoration: underline;
}