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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    transition: var(--transition);
}

.logo a:hover {
    transform: scale(1.05);
}

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transition: var(--transition);
}

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

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

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 120px 20px 80px;
    max-width: 1200px;
    margin: 0 auto;
    gap: 4rem;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.subtitle-company {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.social-icons {
    display: flex;
    gap: 1.25rem;
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.social-icons a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: var(--transition);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-secondary);
}

.social-icons a:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
    background: rgba(102, 126, 234, 0.1);
}

.hero-image {
    flex: 1;
    max-width: 500px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-image-placeholder {
    width: 100%;
    aspect-ratio: 3 / 4;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    position: relative;
    transform: translateZ(0);
    will-change: contents;
}

.hero-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: var(--transition);
    display: block;
    image-rendering: auto;
    -ms-interpolation-mode: bicubic;
    will-change: transform;
    backface-visibility: hidden;
    transform: translateZ(0);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.hero-image:hover .hero-photo {
    transform: translateZ(0) scale(1.05);
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
    animation: fadeInUp 0.8s ease 0.4s both;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.hero-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.5s both;
}

/* About Section */
.about {
    padding: 100px 20px;
    background: var(--bg-primary);
}

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

.about-text h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.about-text h3:first-child {
    margin-top: 0;
}

.experience-item,
.education-item {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.experience-item h4,
.education-item h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.experience-period,
.education-degree {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    font-style: italic;
}

.experience-item p,
.education-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.skill-category {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 12px;
}

.skill-category h5 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Projects Section */
.projects {
    padding: 100px 20px;
    background: var(--bg-secondary);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.project-card {
    background: var(--bg-primary);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 100%;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    width: 100%;
    max-width: 100%;
    height: 200px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    position: relative;
}

.project-image-placeholder {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: var(--transition);
}

.project-card:hover .project-image-placeholder {
    transform: scale(1.1);
}

.project-img {
    width: 100%;
    height: 100%;
    max-width: 100%;
    min-width: 0;
    object-fit: cover;
    object-position: center;
    transition: var(--transition);
    display: block;
    box-sizing: border-box;
}

.project-card:hover .project-img {
    transform: scale(1.1);
}

.project-1 {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.project-2 {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.project-3 {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.project-4 {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.project-5 {
    background: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
}

.project-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    flex: 1;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    padding: 4px 12px;
    background: var(--bg-secondary);
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.project-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    margin-top: auto;
}

.project-link:hover {
    color: var(--secondary-color);
    transform: translateX(5px);
}

/* Publications Section */
.publications {
    padding: 100px 20px;
    background: var(--bg-primary);
}

.publications h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 2rem 0 1.5rem;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.publications h3:first-child {
    margin-top: 0;
}

.awards-list,
.patents-list {
    list-style: none;
    padding: 0;
}

.awards-list li,
.patents-list li {
    padding: 1rem 1.5rem;
    margin-bottom: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
    color: var(--text-secondary);
    line-height: 1.6;
}

.publication-item {
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    transition: var(--transition);
}

.publication-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.publication-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.publication-authors {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.publication-journal {
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Contact Section */
.contact {
    padding: 60px 20px;
    background: var(--bg-secondary);
}

.contact-wrapper {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
}

.contact-info {
    display: flex;
    justify-content: center;
    width: 100%;
}

.contact-item {
    padding: 1.5rem 2rem;
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    max-width: 400px;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    font-size: 1.5rem;
    opacity: 0.8;
    flex-shrink: 0;
}

.contact-item a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
    white-space: nowrap;
    font-weight: 500;
}

.contact-item a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 2rem 20px;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--bg-primary);
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: var(--transition);
        gap: 1rem;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        padding: 100px 20px 60px;
    }

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

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

    .social-icons {
        justify-content: center;
        gap: 0.75rem;
        margin-bottom: 1.5rem;
    }

    .social-icons a {
        font-size: 1.25rem;
        width: 36px;
        height: 36px;
    }

    .hero-image {
        max-width: 100%;
    }

    .projects {
        padding: 60px 0;
    }

    .projects .container {
        padding: 0;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-top: 2rem;
        padding: 0 20px;
    }

    .project-card {
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        margin: 0;
        box-sizing: border-box;
    }

    .project-image {
        width: 100%;
        max-width: 100%;
        height: 200px;
        overflow: hidden;
        position: relative;
        box-sizing: border-box;
    }

    .project-img {
        width: 100%;
        height: 100%;
        max-width: 100%;
        min-width: 0;
        object-fit: cover;
        object-position: center;
        box-sizing: border-box;
        display: block;
    }

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

    .contact-wrapper {
        max-width: 100%;
        padding: 0 20px;
    }

    .contact-item {
        padding: 1.25rem 1.5rem;
        max-width: 100%;
    }

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

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}