/* ===== CSS Variables ===== */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #0f172a;
    --accent-color: #06b6d4;
    --text-color: #1e293b;
    --text-light: #64748b;
    --text-white: #f8fafc;
    --bg-color: #ffffff;
    --bg-alt: #f1f5f9;
    --bg-dark: #0f172a;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --transition: all 0.3s ease;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    font-family: var(--font-display);
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.5);
}

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

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

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

.navbar.scrolled {
    box-shadow: var(--shadow);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.nav-logo img {
    height: 45px;
    width: auto;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    gap: 35px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-color);
    position: relative;
}

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

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

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

.hamburger,
.hamburger::before,
.hamburger::after {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-color);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger {
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, var(--secondary-color) 0%, #1e3a5f 50%, #0c4a6e 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    animation: gradientMove 15s ease-in-out infinite;
}

@keyframes gradientMove {
    0%, 100% { transform: scale(1) translate(0, 0); }
    50% { transform: scale(1.1) translate(-2%, 2%); }
}

.hero-content {
    text-align: center;
    z-index: 1;
    padding: 0 20px;
}

.hero-greeting {
    font-size: 1.25rem;
    color: var(--accent-color);
    margin-bottom: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero-name {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-family: var(--font-display);
    color: var(--text-white);
    margin-bottom: 15px;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
    margin-bottom: 25px;
    animation: fadeInUp 1s ease-out 0.2s backwards;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 600px;
    margin: 0 auto 40px;
    animation: fadeInUp 1s ease-out 0.4s backwards;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 50px;
    animation: fadeInUp 1s ease-out 0.6s backwards;
}

.hero-social {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 1s ease-out 0.8s backwards;
}

.hero-social a {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    color: var(--text-white);
    font-size: 1.2rem;
    transition: var(--transition);
}

.hero-social a:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-3px);
}

.hero-social .social-icon-x {
    width: 1.2rem;
    height: 1.2rem;
    filter: brightness(0) invert(1);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255, 255, 255, 0.5);
    border-bottom: 2px solid rgba(255, 255, 255, 0.5);
    transform: rotate(45deg);
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

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

.about-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 60px;
    align-items: start;
}

.about-image {
    position: sticky;
    top: 100px;
}

.image-frame {
    position: relative;
    padding: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 20px;
}

.image-frame::before {
    content: '';
    position: absolute;
    inset: 15px;
    background: var(--bg-color);
    border-radius: 12px;
}

.placeholder-avatar {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--bg-alt), var(--border-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-avatar i {
    font-size: 8rem;
    color: var(--text-light);
}

.profile-photo {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 12px;
}

.about-text h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 1.05rem;
}

.about-text em {
    color: var(--text-color);
    font-style: italic;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ===== Education Section ===== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

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

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

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 5px;
    width: 15px;
    height: 15px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 3px solid var(--bg-color);
    box-shadow: var(--shadow);
}

.timeline-content {
    background: var(--bg-color);
    padding: 25px 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.timeline-date {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
    padding: 5px 12px;
    border-radius: 20px;
    margin-bottom: 15px;
}

.timeline-content h3 {
    font-size: 1.25rem;
    margin-bottom: 5px;
}

.timeline-content h4 {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 400;
    margin-bottom: 15px;
}

.timeline-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.certification-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.certification-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-light);
}

.certification-list i {
    color: var(--accent-color);
}

/* ===== Experience Carousel Section ===== */
.experience-section {
    background: var(--bg-color);
    overflow: hidden;
    padding-bottom: 80px;
}

.experience-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-top: -40px;
    margin-bottom: 50px;
}

.experience-carousel-wrapper {
    width: 100%;
    overflow: hidden;
    padding: 20px 0;
}

.experience-carousel {
    position: relative;
    width: 100%;
}

.experience-track {
    display: flex;
    gap: 30px;
    animation: scroll-left 40s linear infinite;
    width: max-content;
}

.experience-track:hover {
    animation-play-state: paused;
}

@keyframes scroll-left {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

.experience-item {
    flex-shrink: 0;
    width: 220px;
    background: var(--bg-alt);
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.experience-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
    background: var(--bg-color);
}

.experience-logo {
    width: 120px;
    height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
    border-radius: 12px;
    padding: 15px;
}

.experience-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.experience-logo.ggf-logo {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
}

.experience-logo.ggf-logo span {
    color: var(--text-white);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 1px;
}

.experience-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-color);
    line-height: 1.4;
}

/* Experience Modal Styles */
.experience-modal-content {
    max-width: 800px;
}

.experience-modal-header {
    display: flex;
    gap: 25px;
    align-items: flex-start;
    padding: 30px;
    background: linear-gradient(135deg, var(--bg-alt), var(--bg-color));
    border-radius: 20px 20px 0 0;
}

.experience-modal-logo {
    width: 100px;
    height: 80px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
    border-radius: 12px;
    padding: 10px;
    box-shadow: var(--shadow);
}

.experience-modal-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.experience-modal-logo.text-logo {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
}

.experience-modal-logo.text-logo span {
    color: var(--text-white);
    font-weight: 700;
    font-size: 1.1rem;
}

.experience-modal-title-section {
    flex: 1;
}

.experience-modal-title-section h2 {
    font-size: 1.5rem;
    margin-bottom: 5px;
    color: var(--text-color);
}

.experience-modal-title-section h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 15px;
}

.experience-modal-meta {
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
}

.experience-modal-meta span {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.experience-modal-meta i {
    color: var(--accent-color);
}

.experience-modal-body {
    padding: 30px;
}

.experience-modal-body h4 {
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--bg-alt);
}

.experience-modal-body h4:not(:first-child) {
    margin-top: 30px;
}

.experience-modal-body p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 0.95rem;
}

.experience-modal-body ul {
    list-style: none;
    padding: 0;
}

.experience-modal-body ul li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 12px;
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

.experience-modal-body ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 8px;
    height: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
}

/* Responsive Experience Carousel */
@media (max-width: 768px) {
    .experience-item {
        width: 180px;
        padding: 20px 15px;
    }

    .experience-logo {
        width: 100px;
        height: 60px;
    }

    .experience-title {
        font-size: 0.85rem;
    }

    .experience-modal-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .experience-modal-meta {
        justify-content: center;
    }
}

/* ===== Countries Visited Section ===== */
.countries-visited {
    background: var(--bg-alt);
    padding-bottom: 0;
}

.countries-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-top: -40px;
    margin-bottom: 40px;
}

.countries-subtitle strong {
    color: var(--primary-color);
}

.countries-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.country-stat {
    text-align: center;
    padding: 20px 30px;
    background: var(--bg-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.country-stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.country-stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
}

.countries-map-container {
    width: 100%;
    margin-top: 30px;
}

#countriesMap {
    width: 100%;
    height: 500px;
    border-radius: 0;
    box-shadow: var(--shadow-lg);
}

.country-tooltip {
    background: var(--secondary-color);
    color: var(--text-white);
    border: none;
    border-radius: 6px;
    padding: 8px 12px;
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow);
}

.country-tooltip::before {
    border-top-color: var(--secondary-color);
}

.country-marker {
    background: transparent;
}

.marker-dot {
    width: 12px;
    height: 12px;
    background: var(--accent-color);
    border: 2px solid var(--bg-color);
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s ease;
}

.marker-dot:hover {
    transform: scale(1.3);
}

@media (max-width: 768px) {
    .countries-stats {
        gap: 20px;
    }

    .country-stat {
        padding: 15px 20px;
    }

    .country-stat-number {
        font-size: 1.5rem;
    }

    #countriesMap {
        height: 350px;
    }
}

/* ===== Skills Section ===== */
.skills {
    background: var(--bg-alt);
}

.skills-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: 500;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.tab-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--text-white);
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
}

.skill-card {
    background: var(--bg-color);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.skill-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.skill-icon i {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.skill-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.skill-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.skill-bar {
    height: 6px;
    background: var(--bg-alt);
    border-radius: 3px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 3px;
    width: 0;
    transition: width 1.5s ease;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 20px;
}

.tool-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 25px;
    background: var(--bg-color);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.tool-item i {
    font-size: 2rem;
    color: var(--primary-color);
}

.tool-item span {
    font-weight: 500;
    color: var(--text-color);
}

.domain-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.domain-card {
    background: var(--bg-color);
    padding: 35px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

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

.domain-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.domain-card h4 {
    font-size: 1.15rem;
    margin-bottom: 12px;
}

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

/* ===== Publications Section ===== */
.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.publication-card {
    background: var(--bg-color);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

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

.publication-type {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--accent-color);
    background: rgba(6, 182, 212, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 15px;
}

.publication-card h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
    line-height: 1.4;
}

.publication-subtitle {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 15px;
}

.publication-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.publication-meta span {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.publication-meta i {
    color: var(--primary-color);
}

.publication-authors {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 15px;
}

.publication-description {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 15px;
}

.publication-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 0.95rem;
}

.publication-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.publications-more {
    text-align: center;
    margin-top: 50px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.publications-more p {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 1.05rem;
}

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

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

/* ===== Portfolio Section ===== */
.portfolio {
    background: var(--bg-alt);
}

.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 22px;
    font-size: 0.95rem;
    font-weight: 500;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--text-white);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
}

.portfolio-item {
    background: var(--bg-color);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.portfolio-item.hidden {
    display: none;
}

.portfolio-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.portfolio-item:hover .portfolio-image img {
    transform: scale(1.05);
}

.portfolio-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.view-btn {
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 500;
    background: var(--text-white);
    color: var(--secondary-color);
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transform: translateY(20px);
    transition: var(--transition);
}

.portfolio-item:hover .view-btn {
    transform: translateY(0);
}

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

.portfolio-info {
    padding: 20px 25px;
}

.portfolio-category {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--accent-color);
}

.portfolio-info h3 {
    font-size: 1.05rem;
    margin-top: 8px;
    line-height: 1.4;
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-color);
    border-radius: 20px;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    position: relative;
    transform: scale(0.9);
    transition: var(--transition);
}

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

.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 2rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    z-index: 10;
    transition: var(--transition);
}

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

.modal-body {
    padding: 0;
}

.modal-image {
    width: 100%;
    max-height: 60vh;
    object-fit: contain;
    background: var(--bg-alt);
}

.modal-info {
    padding: 30px;
}

.modal-category {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--accent-color);
}

.modal-info h2 {
    font-size: 1.5rem;
    margin: 10px 0 15px;
}

.modal-info p {
    color: var(--text-light);
    line-height: 1.7;
}

.modal-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.modal-tags span {
    font-size: 0.85rem;
    padding: 6px 14px;
    background: var(--bg-alt);
    border-radius: 20px;
    color: var(--text-light);
}

/* ===== Contact Section ===== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 1.75rem;
    margin-bottom: 20px;
}

.contact-info > p {
    color: var(--text-light);
    margin-bottom: 35px;
    font-size: 1.05rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-bottom: 40px;
}

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

.contact-item i {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 1rem;
    margin-bottom: 5px;
}

.contact-item p {
    color: var(--text-light);
}

.contact-item p a {
    color: var(--primary-color);
    font-weight: 500;
}

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

.social-links {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background: var(--bg-alt);
    border-radius: 10px;
    font-weight: 500;
    transition: var(--transition);
}

.social-link i {
    font-size: 1.2rem;
    color: var(--primary-color);
}

.social-link:hover {
    background: var(--primary-color);
    color: var(--text-white);
}

.social-link:hover i {
    color: var(--text-white);
}

.social-link .social-icon-x {
    width: 1.2rem;
    height: 1.2rem;
    filter: invert(39%) sepia(85%) saturate(1935%) hue-rotate(210deg) brightness(101%) contrast(91%);
}

.social-link:hover .social-icon-x {
    filter: brightness(0) invert(1);
}

/* Contact Map */
.contact-map {
    margin: 25px 0;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.contact-map iframe {
    display: block;
}

.contact-info .contact-details + .social-links {
    margin-top: 30px;
}

/* Contact Form */
.contact-form {
    background: var(--bg-alt);
    padding: 40px;
    border-radius: 20px;
}

.form-group {
    position: relative;
    margin-bottom: 25px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 18px 20px;
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    transition: var(--transition);
}

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

.form-group label {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    color: var(--text-light);
    pointer-events: none;
    transition: var(--transition);
    background: var(--bg-color);
    padding: 0 5px;
}

.form-group textarea + label {
    top: 18px;
    transform: none;
}

.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
    top: 0;
    font-size: 0.85rem;
    color: var(--primary-color);
}

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

/* ===== Footer ===== */
.footer {
    background: var(--secondary-color);
    color: var(--text-white);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 30px;
}

.footer-logo {
    height: 50px;
    width: auto;
    object-fit: contain;
    border-radius: 8px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.6);
    margin-top: 10px;
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--text-white);
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 992px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .about-image {
        position: static;
        max-width: 350px;
        margin: 0 auto 40px;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-color);
        flex-direction: column;
        gap: 0;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        display: block;
        padding: 15px 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-toggle {
        display: flex;
    }

    .section {
        padding: 70px 0;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: 40px;
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .timeline::before {
        left: 7px;
    }

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

    .timeline-marker {
        left: 0;
    }

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

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

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .skills-tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
    }

    .filter-btn {
        flex: 1 1 calc(50% - 5px);
        text-align: center;
    }

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