/* Base Styles */
:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --text-color: #333;
    --text-light: #7f8c8d;
    --white: #fff;
    --black: #000;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

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

a:hover {
    color: var(--accent-color);
}

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

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.5rem;
    color: var(--dark-color);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    margin: 15px auto;
    border-radius: 2px;
}

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

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
}

.btn:hover {
    background: var(--accent-color);
    transform: translateY(-3px);
    box-shadow: var(--box-shadow);
    color: var(--white);
}

.btn-small {
    padding: 8px 15px;
    font-size: 0.9rem;
}

.highlight {
    color: var(--primary-color);
}

/* Navigation */
#navbar {
    background-color: var(--white);
    box-shadow: var(--box-shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
}

#navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 15px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark-color);
}

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

.nav-links a {
    color: var(--dark-color);
    font-weight: 600;
    font-size: 1.1rem;
    position: relative;
}

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

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

.hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    padding: 10px;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--dark-color);
    margin: 5px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    background: linear-gradient(135deg, var(--light-color) 0%, var(--white) 100%);
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
}

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content h2 {
    font-size: 2rem;
    margin-bottom: 15px;
    color: var(--text-light);
    font-weight: 400;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 600px;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: var(--box-shadow);
}

/* About Section */
.about-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-text {
    flex: 1;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-image {
    flex: 1;
    text-align: center;
}

.about-image img {
    border-radius: 10px;
    box-shadow: var(--box-shadow);
}

/* Education Section */
.education-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.education-item {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.education-item:hover {
    transform: translateY(-10px);
}

.education-item h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.education-item .degree {
    font-weight: 600;
    margin-bottom: 5px;
}

.education-item .date {
    color: var(--text-light);
    margin-bottom: 15px;
    font-style: italic;
}

.cv-download {
    text-align: center;
    margin-top: 30px;
}

/* Skills Section */
.skills-content {
    text-align: center;
}

.skills-intro {
    max-width: 800px;
    margin: 0 auto 40px;
}

.skills-intro h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
}

.skill-item {
    background: var(--white);
    padding: 30px 20px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.skill-item:hover {
    transform: translateY(-10px);
    background: var(--primary-color);
    color: var(--white);
}

.skill-item i {
    font-size: 3rem;
    margin-bottom: 15px;
    display: block;
}

.skill-item p {
    font-weight: 600;
    font-size: 1.2rem;
}

/* Interests Section */
.interests-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.interest-item {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
}

.interest-item:hover {
    transform: translateY(-10px);
}

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

.interest-item h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

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

.project-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-10px);
}

.project-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.project-info {
    padding: 25px;
}

.project-info h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.project-info p {
    margin-bottom: 20px;
}

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

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 50px;
    align-items: center;
}

.contact-info {
    margin-bottom: 30px;
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.contact-info p {
    margin-bottom: 15px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-info i {
    width: 30px;
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    font-size: 1.2rem;
    font-weight: bold;
    transition: var(--transition);
}

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

.contact-form {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

/* Footer */
footer {
    background: var(--dark-color);
    color: var(--white);
    padding: 30px 0;
    text-align: center;
}

footer p {
    margin-bottom: 0;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--box-shadow);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.active {
    opacity: 1;
    visibility: visible;
}

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

/* Responsive Design */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        margin-bottom: 50px;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .about-text {
        margin-bottom: 30px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--white);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        transition: var(--transition);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .hamburger {
        display: block;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-links {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn-small {
        width: 100%;
    }
}