:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--gray-100);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
header {
    background-color: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 5px 0;
    transition: all 0.3s ease;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

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

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

/* Hero Section */
#hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 8rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-text {
    text-align: left;
}

.hero-text h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-text h2 {
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    position: relative;
    width: 300px;
    height: 300px;
    margin: 0 auto;
}

.profile-photo {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--white);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.about-text {
    color: var(--white);
    text-align: left;
    padding: 1.5rem;
    margin: 1.5rem 0;
    background: rgba(44, 62, 80, 0.95);
    border-radius: 8px;
}

.about-text h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.about-text p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

.about-overlay {
    display: none;
}

.about-overlay .contact-info {
    background: transparent;
    box-shadow: none;
    padding: 0;
}

.about-overlay .contact-item {
    color: var(--white);
    margin-bottom: 0.5rem;
}

.about-overlay .contact-item i {
    color: var(--secondary-color);
}

.about-overlay .contact-item a {
    color: var(--white);
}

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

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    align-items: start;
}

.contact-info {
    background: transparent;
    box-shadow: none;
    padding: 0;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

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

.contact-item a {
    color: var(--white);
    text-decoration: none;
}

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

/* Experience Section */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-300);
}

.experience-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
    position: relative;
}

.experience-item::before {
    content: '';
    position: absolute;
    left: -2.5rem;
    top: 2rem;
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    background: var(--secondary-color);
    border: 2px solid var(--white);
}

.experience-header {
    margin-bottom: 1rem;
}

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

.company {
    color: var(--gray-700);
    font-weight: 500;
    display: block;
    margin-bottom: 0.25rem;
}

.duration {
    color: var(--gray-600);
    font-size: 0.9rem;
}

.responsibilities {
    list-style: none;
}

.responsibilities li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.responsibilities li::before {
    content: "•";
    color: var(--secondary-color);
    position: absolute;
    left: 0;
}

/* Education Section */
.education-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.education-item {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.education-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.education-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.4rem;
    line-height: 1.4;
}

.institution {
    color: var(--gray-700);
    font-weight: 500;
    display: block;
    margin-bottom: 0.5rem;
}

.duration {
    color: var(--gray-600);
    font-size: 0.9rem;
    display: block;
    margin-bottom: 1rem;
}

.thesis {
    font-style: italic;
    color: var(--gray-600);
    margin: 1rem 0;
    line-height: 1.6;
}

.note {
    display: inline-block;
    background: var(--gray-100);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--gray-700);
    margin-top: 1rem;
}

/* Skills Section */
#skills {
    padding: 4rem 0;
    background: var(--gray-100);
}

#skills h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
    font-size: 2.5rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.skill-category {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--secondary-color);
    opacity: 0.8;
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--gray-200);
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.skill-category h3::before {
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    font-size: 1.2rem;
    color: var(--secondary-color);
}

.skill-category:nth-child(1) h3::before {
    content: '\f0c0';
}

.skill-category:nth-child(2) h3::before {
    content: '\f121';
}

.skill-category:nth-child(3) h3::before {
    content: '\f085';
}

.skill-category:nth-child(4) h3::before {
    content: '\f0ac';
}

.skill-category ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.skill-category li {
    background: var(--gray-100);
    padding: 0.75rem 1.25rem;
    border-radius: 20px;
    font-size: 1rem;
    color: var(--gray-700);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.skill-category li i {
    font-size: 1.1rem;
    color: var(--secondary-color);
    width: 20px;
    text-align: center;
}

.skill-category li:hover {
    background: var(--secondary-color);
    color: var(--white);
    border-color: var(--secondary-color);
    transform: translateY(-2px);
}

.skill-category li:hover i {
    color: var(--white);
}

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

.award-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: relative;
    padding-left: 5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.award-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.award-item .year {
    position: absolute;
    left: 1.5rem;
    top: 2rem;
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.9rem;
}

.award-content {
    padding-left: 1rem;
}

.award-content h3 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.award-content p {
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.award-date {
    display: block;
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.award-note {
    display: inline-block;
    background: var(--gray-100);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--gray-700);
    margin-top: 0.5rem;
}

/* Contact Section */
#contact {
    padding: 4rem 0;
    background: var(--gray-100);
}

#contact h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
    font-size: 2.5rem;
}

.contact-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    justify-content: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.cv-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--white);
    color: var(--primary-color);
    padding: 1rem 1.5rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    justify-content: center;
    white-space: nowrap;
}

.cv-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    background-color: var(--secondary-color);
    color: var(--white);
}

.cv-button i {
    font-size: 1.2rem;
}

.github-button {
    background-color: #24292e;
    color: var(--white);
}

.github-button:hover {
    background-color: #2f363d;
    color: var(--white);
}

.linkedin-button {
    background-color: #0077b5;
    color: var(--white);
}

.linkedin-button:hover {
    background-color: #005582;
    color: var(--white);
}

.view-button {
    background-color: var(--secondary-color);
    color: var(--white);
}

.view-button:hover {
    background-color: var(--primary-color);
}

@media (max-width: 1200px) {
    .contact-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .skills-grid {
        grid-template-columns: 1fr;
        padding: 0 1rem;
    }

    .skill-category {
        padding: 2rem;
    }

    .skill-category li {
        flex: 1 1 100%;
    }

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

    .cv-button {
        width: 100%;
    }

    .education-grid {
        grid-template-columns: 1fr;
        padding: 0 1rem;
    }

    .education-item {
        padding: 2rem;
    }
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
}

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

    .nav-content {
        flex-direction: row;
        align-items: center;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        text-align: center;
        padding: 1rem 0;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

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

    .nav-links li {
        margin: 0.5rem 0;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-text {
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .hero-text h2 {
        font-size: 1.5rem;
    }

    .hero-image {
        width: 200px;
        height: 200px;
    }

    .about-text {
        text-align: center;
        padding: 1rem;
        margin: 1rem 0;
    }

    .about-text h3 {
        font-size: 1.2rem;
    }

    .about-text p {
        font-size: 0.9rem;
    }

    .contact-info {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .button-group {
        flex-direction: column;
        align-items: center;
    }

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

    .award-item {
        padding-left: 4rem;
    }

    .award-item .year {
        left: 1rem;
        top: 1.5rem;
    }

    .skill-category {
        padding: 1.5rem;
    }

    .skill-category h3 {
        font-size: 1.2rem;
    }

    .skill-category ul {
        gap: 0.5rem;
    }

    .skill-category li {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .skill-category li i {
        font-size: 1rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

section {
    animation: fadeIn 0.6s ease-out;
}