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

:root {
    --primary-color: #1e3a5f;
    --secondary-color: #2c5f8d;
    --accent-color: #d4af37;
    --text-dark: #2c3e50;
    --text-light: #6c757d;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e9ecef;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    font-weight: 600;
    color: var(--primary-color);
    line-height: 1.3;
}

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

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

/* Navigation */
.navbar {
    background: var(--bg-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 0;
}

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

.nav-menu li a {
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.nav-menu li a:hover {
    color: var(--secondary-color);
    border-bottom-color: var(--accent-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    margin-top: 80px;
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.certification-badges {
    display: flex;
    gap: 1.5rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.cert-badge {
    height: 100px;
    width: auto;
    object-fit: contain;
    transition: var(--transition);
}

.cert-badge:hover {
    transform: scale(1.05);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    display: inline-block;
    text-align: center;
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(30, 58, 95, 0.3);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

.hero-image {
    display: flex;
    justify-content: center;
}

.profile-photo {
    width: 100%;
    max-width: 400px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
}

.profile-photo:hover {
    transform: scale(1.02);
    box-shadow: 0 25px 70px rgba(0, 0, 0, 0.2);
}

/* Section Styles */
section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 2px;
}

/* About Section */
.about {
    background: var(--bg-white);
}

.about-text {
    max-width: 900px;
    margin: 0 auto;
}

.about-text .lead {
    font-size: 1.25rem;
    color: var(--secondary-color);
    margin-bottom: 2rem;
    font-weight: 500;
    line-height: 1.8;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    line-height: 1.8;
}

.patent-link {
    color: var(--secondary-color);
    font-weight: 600;
    text-decoration: underline;
}

.patent-link:hover {
    color: var(--accent-color);
}

.specialties, .languages {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 10px;
    border-left: 4px solid var(--accent-color);
}

.specialties h3, .languages h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.specialties ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.specialties li {
    padding: 0.5rem 0;
    color: var(--text-dark);
    font-size: 1.05rem;
}

.specialties li::before {
    content: '✓';
    color: var(--accent-color);
    font-weight: bold;
    margin-right: 0.5rem;
}

.languages p {
    font-size: 1.1rem;
    color: var(--text-dark);
}

/* Training Section */
.training {
    background: var(--bg-light);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto 4rem;
    padding-left: 50px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}

.timeline-marker {
    position: absolute;
    left: -42px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-color);
    border: 4px solid var(--bg-light);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.timeline-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.timeline-content h4 {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.timeline-date {
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.timeline-content ul {
    margin-top: 1rem;
    padding-left: 1.5rem;
}

.timeline-content li {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

/* Certifications Grid */
.certifications {
    max-width: 900px;
    margin: 4rem auto;
}

.certifications h3 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

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

.cert-item {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
}

.cert-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

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

.cert-item p {
    font-size: 0.95rem;
    color: var(--text-dark);
    line-height: 1.6;
}

.cert-item strong {
    color: var(--primary-color);
    display: block;
    margin-bottom: 0.5rem;
}

/* Additional Education */
.additional-education {
    max-width: 900px;
    margin: 4rem auto 0;
}

.additional-education h3 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

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

.mooc-item {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.mooc-item h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.mooc-item p {
    color: var(--text-light);
    margin-bottom: 1rem;
    font-style: italic;
}

.mooc-item ul {
    padding-left: 1.5rem;
}

.mooc-item li {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-size: 0.95rem;
}

/* Publications Section */
.publications {
    background: var(--bg-white);
}

.publications-content {
    max-width: 900px;
    margin: 0 auto;
}

.publications-content h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin: 3rem 0 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
}

.publication-list, .presentation-list {
    margin-bottom: 3rem;
}

.pub-item, .pres-item {
    background: var(--bg-light);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
    transition: var(--transition);
}

.pub-item:hover, .pres-item:hover {
    border-left-color: var(--accent-color);
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.pub-item p, .pres-item p {
    font-size: 1rem;
    color: var(--text-dark);
    line-height: 1.7;
}

.pub-item strong {
    color: var(--primary-color);
    font-weight: 600;
}

.pres-item h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.pres-item ul {
    padding-left: 1.5rem;
}

.pres-item li {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

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

.footer-content p {
    margin-bottom: 0.5rem;
    color: #adb5bd;
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .certification-badges {
        justify-content: center;
    }

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

    .profile-photo {
        max-width: 350px;
    }

    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

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

    .timeline {
        padding-left: 40px;
    }

    .timeline-marker {
        left: -37px;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 60px 0;
    }

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

    .hero-subtitle {
        font-size: 1.1rem;
    }

    section {
        padding: 60px 0;
    }

    .cert-badge {
        height: 80px;
    }

    .about-text .lead {
        font-size: 1.1rem;
    }

    .about-text p {
        font-size: 1rem;
    }

    .specialties ul {
        grid-template-columns: 1fr;
    }

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

    .contact-info {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 1.75rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .certification-badges {
        flex-direction: column;
        align-items: center;
    }
}