:root {
    --primary: #2c3e50;
    --secondary: #3498db;
    --accent: #e74c3c;
    --light: #ecf0f1;
    --dark: #34495e;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text);
    background-color: var(--white);
    line-height: 1.6;
}

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

/* Navigation */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    text-decoration: none;
}

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

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

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 100px 0;
    text-align: center;
}

.hero-content {
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    display: inline-block;
}

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

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* Sections */
.section {
    padding: 80px 0;
}

.bg-light {
    background-color: var(--light);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--secondary);
    margin: 0.5rem auto 0;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

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

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: var(--light);
    border-radius: 5px;
}

.stat h3 {
    font-size: 2rem;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.avatar-placeholder {
    width: 100%;
    max-width: 300px;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 150px;
    color: var(--white);
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.avatar-placeholder .avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
    display: block;
}

.avatar-placeholder .avatar-icon {
    position: absolute;
    display: none;
    pointer-events: none;
}

/* Show icon only when image is hidden */
.avatar-placeholder .avatar-img.hidden + .avatar-icon {
    display: block;
}
}

.avatar-placeholder img + .avatar-icon {
    display: block;
}

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

.skill-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    text-align: center;
}

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

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

.skill-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.skill-card p {
    color: var(--text-light);
}

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

.project-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

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

.project-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 1.5rem;
}

.project-header h3 {
    margin-bottom: 0.5rem;
}

.project-body {
    padding: 1.5rem;
}

.project-description {
    color: var(--text-light);
    margin-bottom: 1rem;
}

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

.tech-tag {
    background: var(--light);
    color: var(--secondary);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

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

.project-links a {
    color: var(--secondary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.project-links a:hover {
    color: var(--primary);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--secondary);
}

.timeline-item {
    margin-bottom: 3rem;
    width: 45%;
}

.timeline-item:nth-child(odd) {
    margin-left: 0;
    text-align: right;
    padding-right: 3rem;
}

.timeline-item:nth-child(even) {
    margin-left: 55%;
    padding-left: 3rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    width: 15px;
    height: 15px;
    background: var(--secondary);
    border-radius: 50%;
    top: 0;
}

.timeline-item:nth-child(odd)::before {
    right: -27px;
}

.timeline-item:nth-child(even)::before {
    left: -27px;
}

.timeline-item {
    position: relative;
}

.timeline-content {
    background: var(--light);
    padding: 1.5rem;
    border-radius: 5px;
}

.timeline-content h3 {
    margin-bottom: 0.5rem;
}

.timeline-date {
    color: var(--secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.timeline-description {
    color: var(--text-light);
}

/* Achievements Section */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.achievement-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--secondary);
    transition: all 0.3s ease;
    text-align: center;
}

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

.achievement-icon {
    font-size: 2.5rem;
    color: var(--secondary);
    margin-bottom: 1rem;
}

.achievement-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

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

/* Education Section */
.education-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.education-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--secondary);
}

.education-item h3 {
    margin-bottom: 0.25rem;
    font-size: 1.3rem;
}

.education-institution {
    color: var(--secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.education-year {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

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

/* Professional Development Section */
.development-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.development-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

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

.development-card h3 {
    margin-bottom: 0.5rem;
    color: var(--secondary);
}

.development-type {
    display: inline-block;
    background: var(--light);
    color: var(--secondary);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.development-date {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.development-card p {
    color: var(--text-light);
}

/* Contact Section */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--light);
    border-radius: 5px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

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

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

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--secondary);
}

.contact-item a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.social-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--light);
    color: var(--secondary);
    border-radius: 50%;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.social-links a:hover {
    background: var(--secondary);
    color: var(--white);
    transform: translateY(-5px);
}

/* Footer */
.footer {
    background: var(--primary);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

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

.footer a:hover {
    text-decoration: underline;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        gap: 0;
    }

    .nav-menu.active {
        display: flex;
    }

    .menu-toggle {
        display: flex;
    }

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

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

    .about-grid,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }

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

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        width: 100%;
        padding-left: 50px;
    }

    .timeline-item:nth-child(odd),
    .timeline-item:nth-child(even) {
        width: 100%;
        margin-left: 0;
        padding-left: 50px;
        padding-right: 0;
        text-align: left;
    }

    .timeline-item::before {
        left: -20px;
    }

    .timeline-item:nth-child(odd)::before,
    .timeline-item:nth-child(even)::before {
        left: -20px;
    }

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

@media (max-width: 480px) {
    .hero {
        padding: 50px 0;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .section {
        padding: 40px 0;
    }

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

    .btn {
        width: 100%;
    }
}