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

:root {
    --bg-dark: #000000;
    --bg-light: #0a0a0a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-blue: #0071e3;
    --accent-cyan: #00d4ff;
    --accent-gold: #ffd700;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Navigation */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-logo:hover {
    color: var(--accent-cyan);
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link.active {
    color: var(--accent-blue);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-blue);
}

/* Page Hero */
.page-hero {
    min-height: 50vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 5rem;
    background: radial-gradient(circle at 50% 20%, rgba(0, 113, 227, 0.1) 0%, transparent 60%);
}

.page-hero-title {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.page-hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--text-secondary);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

/* Summary Section */
#summary {
    padding: 4rem 2rem;
}

.summary-card {
    max-width: 900px;
    margin: 0 auto;
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border-radius: 24px;
    padding: 3rem;
    border: 1px solid rgba(255,255,255,0.1);
}

.summary-text {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

/* Achievements Grid */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.achievement-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.3s ease;
}

.achievement-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 212, 255, 0.2);
    border-color: rgba(0, 212, 255, 0.3);
}

.achievement-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.achievement-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.achievement-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Experience Timeline */
.experience-timeline {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 0;
}

.experience-item {
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border-radius: 24px;
    padding: 3rem;
    margin-bottom: 3rem;
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.3s ease;
}

.experience-item:hover {
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: 0 10px 40px rgba(0, 212, 255, 0.15);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.company-name {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}

.company-location {
    color: var(--text-secondary);
    font-size: 1rem;
}

.period-badge {
    background: var(--accent-blue);
    color: white;
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
}

.experience-role {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
}

.experience-highlights {
    list-style: none;
    padding: 0;
}

.experience-highlights li {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
}

.experience-highlights li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-cyan);
    font-weight: bold;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

.skill-category {
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid rgba(255,255,255,0.1);
}

.skill-category-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--accent-cyan);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background: rgba(0, 113, 227, 0.2);
    color: var(--text-primary);
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    font-size: 0.9rem;
    border: 1px solid rgba(0, 113, 227, 0.3);
    transition: all 0.3s ease;
}

.skill-tag:hover {
    background: rgba(0, 113, 227, 0.3);
    transform: translateY(-2px);
}

/* Education Section */
.education-section,
.certifications-section {
    margin-bottom: 4rem;
}

.subsection-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--accent-cyan);
}

.education-card {
    max-width: 700px;
    margin: 0 auto;
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    gap: 2rem;
}

.education-icon {
    font-size: 3rem;
}

.education-degree {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.education-school {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Certifications Grid */
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.cert-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.cert-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.2);
}

.cert-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cert-name {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
}

/* Publications Section */
.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.publication-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.publication-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 212, 255, 0.2);
}

.publication-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.publication-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.publication-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

.book-card {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.book-cover {
    width: 180px;
    height: auto;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}

.book-cover:hover {
    transform: scale(1.05);
}

.book-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* CTA Section */
.cta-section {
    text-align: center;
    padding: 6rem 2rem;
    background: radial-gradient(circle at 50% 50%, rgba(0, 113, 227, 0.1) 0%, transparent 70%);
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 20%, rgba(0, 113, 227, 0.15) 0%, transparent 60%),
                radial-gradient(circle at 70% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 60%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 1200px;
    padding: 2rem;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 7rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff 0%, var(--accent-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 2.5vw, 2rem);
    color: var(--text-secondary);
    margin-bottom: 3rem;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-photo {
    margin-bottom: 3rem;
    animation: fadeInUp 1s ease-out both;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid rgba(0, 212, 255, 0.3);
    box-shadow: 0 20px 60px rgba(0, 212, 255, 0.2);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.profile-image:hover {
    transform: scale(1.05);
    border-color: rgba(0, 212, 255, 0.6);
    box-shadow: 0 25px 80px rgba(0, 212, 255, 0.3);
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.btn {
    padding: 1rem 2.5rem;
    border-radius: 980px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
}

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

.btn-primary:hover {
    background: #0077ed;
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(0, 113, 227, 0.4);
}

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

.btn-secondary:hover {
    background: rgba(0, 113, 227, 0.1);
    transform: translateY(-2px);
}

section {
    padding: 8rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: clamp(1rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.project-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    border-radius: 24px;
    padding: 3rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 212, 255, 0.15);
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
}

.project-icon img {
    width: 80px;
    height: 80px;
    object-fit: contain;
}

.project-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-blue), var(--accent-cyan));
}

.timeline-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4rem;
    position: relative;
}

.timeline-content {
    width: 45%;
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
}

.evolution-links {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.evolution-links p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

.evolution-links-container {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.evolution-link {
    color: var(--accent-cyan);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 20px;
    transition: all 0.3s ease;
}

.evolution-link:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 212, 255, 0.2);
}

.timeline-year {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-blue);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.2rem;
    box-shadow: 0 10px 30px rgba(0, 113, 227, 0.4);
}

.saas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.saas-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.03));
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
    display: block;
}

.saas-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 212, 255, 0.2);
    border-color: var(--accent-cyan);
}

.saas-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.saas-icon img {
    width: 60px;
    height: 60px;
    object-fit: contain;
}

.saas-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.saas-tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.contact-section {
    text-align: center;
    padding: 6rem 2rem;
}

.contact-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.contact-link {
    color: var(--accent-blue);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

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

@media (max-width: 768px) {
    .nav-container {
        padding: 1rem 1.5rem;
    }

    .nav-links {
        gap: 1.5rem;
    }

    .nav-link {
        font-size: 0.9rem;
    }

    .page-hero {
        min-height: 40vh;
        padding-top: 6rem;
    }

    .summary-card {
        padding: 2rem;
    }

    .summary-text {
        font-size: 1rem;
    }

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

    .experience-item {
        padding: 2rem;
    }

    .experience-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .education-card {
        flex-direction: column;
        text-align: center;
        padding: 2rem;
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .timeline-content {
        width: 100%;
        margin-left: 2rem;
    }

    .timeline-year {
        position: relative;
        left: 0;
        transform: none;
        margin-bottom: 1rem;
        display: inline-block;
    }

    .project-grid,
    .saas-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-logo {
        font-size: 1.1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-link {
        font-size: 0.85rem;
    }

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

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

    .achievement-card,
    .skill-category,
    .experience-item {
        padding: 1.5rem;
    }

    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}