* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #ffffff;
    --secondary: #f5f7fa;
    --accent: #0077b6;
    --accent-hover: #005a8c;
    --text: #1a1a2e;
    --text-secondary: #4a5568;
    --white: #1a1a2e;
    --gradient: linear-gradient(135deg, #ffffff 0%, #e8f4f8 100%);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--primary);
    color: var(--text);
    line-height: 1.6;
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 15px 0;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar.scrolled {
    box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--accent);
    transition: all 0.3s ease;
}

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 100px 20px 50px;
    background: var(--gradient);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%230077b6' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    max-width: 1200px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
    z-index: 1;
}

.hero-text {
    flex: 1;
}

.hero-subtitle {
    color: var(--accent);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: 4rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 15px;
    line-height: 1.1;
}

.hero-description {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.hero-location {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.hero-location i {
    color: var(--accent);
    margin-right: 8px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 15px 30px;
    border-radius: 5px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: var(--primary);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(100, 255, 218, 0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

.btn-secondary:hover {
    background: rgba(0, 119, 182, 0.1);
    transform: translateY(-3px);
}

.btn-download {
    background: #2d3748;
    color: #ffffff;
}

.btn-download:hover {
    background: #1a202c;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.btn-download i {
    margin-right: 8px;
}

.hero-image {
    flex: 0 0 300px;
}

.hero-avatar {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: var(--secondary);
    border: 4px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 20px 50px rgba(0, 119, 182, 0.2);
}

.hero-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    border-radius: 50%;
}

.hero-avatar i {
    font-size: 8rem;
    color: var(--accent);
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.hero-scroll a {
    color: var(--accent);
    font-size: 1.5rem;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-15px); }
    60% { transform: translateX(-50%) translateY(-7px); }
}

.section-title {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    color: var(--white);
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--accent);
}

.about {
    padding: 100px 0;
    background: var(--primary);
}

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 50px;
    align-items: start;
}

.about-card {
    background: var(--secondary);
    padding: 40px;
    border-radius: 10px;
    border-left: 4px solid var(--accent);
}

.about-card h3 {
    color: var(--accent);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: var(--secondary);
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.info-item:hover {
    transform: translateX(10px);
}

.info-item i {
    font-size: 1.5rem;
    color: var(--accent);
    width: 40px;
}

.info-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 5px;
}

.info-value {
    color: var(--white);
    font-weight: 500;
}

.experience {
    padding: 100px 0;
    background: var(--secondary);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent);
}

.timeline-item {
    position: relative;
    padding-left: 40px;
    margin-bottom: 50px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -8px;
    top: 0;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border: 3px solid var(--accent);
    border-radius: 50%;
}

.timeline-content {
    background: var(--primary);
    padding: 30px;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.timeline-content:hover {
    transform: translateX(10px);
}

.timeline-date {
    display: inline-block;
    background: var(--accent);
    color: var(--primary);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.timeline-content h3 {
    color: var(--white);
    font-size: 1.3rem;
    margin-bottom: 5px;
}

.timeline-content h4 {
    color: var(--accent);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 10px;
}

.timeline-content .location {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.timeline-content .location i {
    margin-right: 8px;
}

.timeline-content ul {
    list-style: none;
}

.timeline-content ul li {
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.timeline-content ul li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.education {
    padding: 100px 0;
    background: var(--primary);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.education-card {
    background: var(--secondary);
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s ease;
    border-top: 4px solid var(--accent);
}

.education-card:hover {
    transform: translateY(-10px);
}

.education-icon {
    width: 80px;
    height: 80px;
    background: rgba(100, 255, 218, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
}

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

.education-card h3 {
    color: var(--white);
    font-size: 1.1rem;
    margin-bottom: 15px;
    line-height: 1.4;
}

.education-place {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 5px;
}

.education-year {
    color: var(--accent);
    font-weight: 600;
}

.education-spec {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
    margin-top: 5px;
}

.certifications {
    padding: 100px 0;
    background: var(--secondary);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.cert-card {
    background: var(--primary);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

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

.cert-logo {
    width: 60px;
    height: 60px;
    background: rgba(100, 255, 218, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.cert-logo i {
    font-size: 1.8rem;
    color: var(--accent);
}

.cert-card h3 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: 10px;
    line-height: 1.4;
}

.cert-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.research {
    padding: 100px 0;
    background: var(--primary);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.research-card {
    background: var(--secondary);
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s ease;
}

.research-card:hover {
    transform: translateY(-10px);
}

.research-card i {
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: 20px;
}

.research-card h3 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 10px;
}

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

.activities {
    background: var(--secondary);
    padding: 40px;
    border-radius: 10px;
}

.activities h3 {
    color: var(--white);
    font-size: 1.3rem;
    margin-bottom: 25px;
    text-align: center;
}

.activities ul {
    list-style: none;
    max-width: 800px;
    margin: 0 auto;
}

.activities ul li {
    color: var(--text-secondary);
    padding: 15px 0;
    border-bottom: 1px solid rgba(0, 119, 182, 0.1);
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.activities ul li:last-child {
    border-bottom: none;
}

.activities ul li i {
    color: var(--accent);
    margin-top: 3px;
}

.activities ul li strong {
    color: var(--accent);
}

.contact {
    padding: 100px 0;
    background: var(--secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--accent);
    margin-top: 5px;
}

.contact-item h4 {
    color: var(--white);
    margin-bottom: 5px;
}

.contact-item a,
.contact-item p {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.contact-form {
    background: var(--primary);
    padding: 40px;
    border-radius: 10px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: var(--secondary);
    border: 2px solid transparent;
    border-radius: 5px;
    color: var(--text);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
}

.contact-form .btn {
    width: 100%;
}

.footer {
    background: var(--secondary);
    padding: 30px 0;
    text-align: center;
    border-top: 1px solid rgba(0, 119, 182, 0.2);
}

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

.footer-domain {
    color: var(--accent);
    margin-top: 10px;
}

@media (max-width: 992px) {
    .hero-content {
        flex-direction: column-reverse;
        text-align: center;
    }

    .hero-image {
        flex: none;
    }

    .hero-avatar {
        width: 200px;
        height: 200px;
    }

    .hero-avatar i {
        font-size: 5rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-title {
        font-size: 3rem;
    }

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

    .education-grid,
    .cert-grid,
    .research-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--primary);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        transform: translateY(-150%);
        transition: transform 0.3s ease;
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

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

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

    .timeline::before {
        left: 8px;
    }

    .timeline-marker {
        left: 0;
    }

    .timeline-item {
        padding-left: 35px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .btn {
        padding: 12px 25px;
        font-size: 0.9rem;
    }

    .contact-form {
        padding: 25px;
    }
}