/* Header & Navbar */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(var(--bg-rgb), 0.86);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 1001;
}

.logo-img {
    height: 40px;
    width: auto;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
    position: relative;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--text-main);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    z-index: 1001;
}

.theme-btn,
.hamburger {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

.theme-btn:hover {
    color: var(--text-muted);
}

.hamburger {
    display: none;
}

/* Hero Section */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
}

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

.hero-content {
    animation: fadeUp 1s ease forwards;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.8rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-text {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

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

.hero-image-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    animation: fadeIn 1.5s ease forwards;
}

.hero-img {
    width: min(100%, 420px);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    object-fit: cover;
}

/* Scroll Down Indicator */

.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.5rem;
    color: var(--text-muted);
    animation: bounce 2s infinite;
    transition: var(--transition);
}

.scroll-down:hover {
    color: var(--text-main);
}

/* About Section */

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

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

/* Skills Section */

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
    gap: 2rem;
}

.skill-category {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.skill-category h3 {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    background-color: var(--bg-alt);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.skill-tag:hover {
    background-color: var(--primary-color);
    color: var(--bg-color);
    border-color: var(--primary-color);
}

/* Projects Section */

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
    gap: 2.5rem;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.project-img-placeholder {
    height: 200px;
    background-color: var(--bg-alt);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

.project-info {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.project-info p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 1.5rem;
}

.project-tech span {
    font-size: 0.8rem;
    padding: 4px 10px;
    background-color: var(--bg-alt);
    border-radius: 4px;
    color: var(--text-muted);
    font-weight: 500;
}

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

.project-link {
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

.project-link:hover {
    color: var(--text-muted);
}

/* Research Section */

.carousel-wrapper {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
}

.carousel-track-container {
    overflow: hidden;
    width: 100%;
    border-radius: 12px;
    background-color: var(--card-bg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.carousel-track {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.carousel-slide {
    min-width: 100%;
    padding: 3rem;
}

.research-content {
    text-align: center;
}

.research-date {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--bg-alt);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-muted);
}

.research-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.research-venue {
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.research-abstract {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    z-index: 10;
    color: var(--text-main);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.carousel-btn:hover {
    background-color: var(--primary-color);
    color: var(--bg-color);
}

.left-btn {
    left: -20px;
}

.right-btn {
    right: -20px;
}

.carousel-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 2rem;
}

.carousel-indicator {
    border: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.carousel-indicator.current-indicator {
    background-color: var(--primary-color);
    transform: scale(1.2);
}

/* Hobbies Section */

.hobbies-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.hobbies-row {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.hobbies-row-top .hobby-card {
    flex: 1;
    max-width: calc(33.333% - 1.5rem);
}

.hobbies-row-bottom .hobby-card {
    flex: 0 1 calc(33.333% - 1.5rem);
}

.hobby-card {
    background-color: var(--card-bg);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.hobby-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-sm);
}

.hobby-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.hobby-card h3 {
    margin-bottom: 1rem;
}

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

/* Contact Section */

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    background-color: var(--card-bg);
    padding: 4rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.contact-info h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.contact-info>p {
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

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

.icon-box {
    width: 50px;
    height: 50px;
    background-color: var(--bg-alt);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    color: var(--text-main);
}

.contact-item h4 {
    font-size: 1rem;
    margin-bottom: 0.2rem;
}

.contact-item span {
    color: var(--text-muted);
    font-size: 0.9rem;
    overflow-wrap: anywhere;
}

.social-links-large {
    display: flex;
    gap: 1rem;
}

.social-links-large a {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: var(--bg-alt);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-links-large a:hover {
    background-color: var(--primary-color);
    color: var(--bg-color);
    transform: translateY(-3px);
}

/* Social Links */

.contact-socials {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-socials h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.social-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
}

.social-grid a {
    background-color: var(--bg-alt);
    border: 1px solid var(--border-color);
    border-radius: 16px;

    padding: 1.2rem;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;

    text-decoration: none;
    transition: var(--transition);

    min-height: 120px;
}

.social-grid a:hover {
    background-color: var(--primary-color);
    color: var(--bg-color);
    transform: translateY(-5px);
}

.social-grid .icon {
    width: 28px;
    height: 28px;
}

.social-grid span {
    font-size: 0.95rem;
    font-weight: 500;
}

/* Mobile */

@media (max-width: 768px) {

    .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 2rem;
    }

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

/* Education & Experience Timeline */

.timeline {
    position: relative;
    max-width: 780px;
    margin: 0 auto;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 18px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    display: flex;
    gap: 2rem;
    margin-bottom: 2.5rem;
}

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

.timeline-marker {
    position: absolute;
    left: -2rem;
    top: 0;
    width: 38px;
    height: 38px;
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    flex-shrink: 0;
    transition: var(--transition);
    z-index: 1;
}

.timeline-item:hover .timeline-marker {
    background-color: var(--primary-color);
    color: var(--bg-color);
    border-color: var(--primary-color);
}

.timeline-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem 2rem;
    margin-left: 1.5rem;
    flex: 1;
    transition: var(--transition);
}

.timeline-item:hover .timeline-content {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.timeline-period {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    background-color: var(--bg-alt);
    padding: 3px 10px;
    border-radius: 50px;
    margin-bottom: 0.6rem;
}

.timeline-content h3 {
    font-size: 1.15rem;
    margin-bottom: 0.3rem;
}

.timeline-place {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Certifications & Achievements */

.cert-achievement-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.cert-block-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.8rem;
    border-bottom: 2px solid var(--border-color);
}

.cert-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cert-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.2rem 1.5rem;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
}

.cert-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.cert-card-inner h4 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.cert-card-inner p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.cert-link-icon {
    flex-shrink: 0;
    opacity: 0.4;
    transition: var(--transition);
}

.cert-card:hover .cert-link-icon {
    opacity: 1;
}

.achievement-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.achievement-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.2rem 1.5rem;
    transition: var(--transition);
}

.achievement-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.achievement-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 6px;
}

.achievement-item p {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .cert-achievement-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-content {
        padding: 1.2rem 1.5rem;
        margin-left: 1rem;
    }
}

/* Footer */

.footer {
    background-color: var(--bg-alt);
    padding: 1.5rem 0;
    border-top: 1px solid var(--border-color);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-name {
    font-size: 1.5rem;
    font-weight: 700;
    display: block;
    margin-bottom: 0.5rem;
}

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

.back-to-top {
    width: 40px;
    height: 40px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition);
}

.back-to-top:hover {
    background-color: var(--primary-color);
    color: var(--bg-color);
}