/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #e74c3c;
    --accent-color: #f39c12;
    --text-color: #333;
    --light-text: #666;
    --bg-color: #ffffff;
    --light-bg: #f8f9fa;
    --border-color: #e9ecef;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 5px 20px rgba(0,0,0,0.15);
}

body {
    font-family: 'Source Sans Pro', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 2px;
}

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

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

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

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

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: width 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding-top: 80px;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--light-text);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: transparent;
    border-color: var(--secondary-color);
    color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-circle {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-hover);
    animation: float 6s ease-in-out infinite;
}

.profile-circle i {
    font-size: 6rem;
    color: white;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Section Styles */
section {
    padding: 5rem 0;
}

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

.about-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--light-text);
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* Experience Section */
.experience {
    background: var(--light-bg);
}

.experience-item {
    background: var(--bg-color);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    max-width: 900px;
    margin: 0 auto;
}

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

.experience-header h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin: 0;
}

.company {
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 1.1rem;
}

.period {
    color: var(--light-text);
    font-size: 0.9rem;
    background: var(--light-bg);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

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

.experience-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.experience-list li {
    padding: 0.5rem 0;
    color: var(--light-text);
    position: relative;
    padding-left: 1.5rem;
}

.experience-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.experience-note {
    font-style: italic;
    color: var(--light-text);
    background: var(--light-bg);
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    margin: 0;
}

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

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.skill-category {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.skill-category:hover {
    transform: translateY(-5px);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: 0.5rem 0;
    color: var(--light-text);
    position: relative;
    padding-left: 1.5rem;
}

.skill-category li::before {
    content: '●';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Education Section */
.education {
    background: var(--light-bg);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.education-item {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
}

.education-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.degree {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

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

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

.achievements {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
}

.achievements h4 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 1.5rem;
}

.achievements ul {
    list-style: none;
}

.achievements li {
    padding: 0.5rem 0;
    color: var(--light-text);
    position: relative;
    padding-left: 2rem;
    text-align: center;
}

.achievements li::before {
    content: '🏆';
    position: absolute;
    left: 0;
    width: 100%;
    text-align: center;
}

/* Contact Section */
.contact {
    background: var(--bg-color);
}

.contact-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    max-width: 900px;
    margin: 0 auto;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--light-bg);
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.contact-item:hover {
    transform: translateX(10px);
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--secondary-color);
    width: 30px;
    text-align: center;
}

.contact-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.contact-item p {
    color: var(--light-text);
    margin: 0;
}

.social-links {
    text-align: center;
}

.social-links h4 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--secondary-color);
    color: white;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    background: var(--primary-color);
}

.social-link i {
    font-size: 1.2rem;
}

/* Reference Section */
.reference {
    background: var(--light-bg);
}

.reference-card {
    background: var(--bg-color);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

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

.reference-title {
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.reference-contact p {
    margin-bottom: 0.5rem;
    color: var(--light-text);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .profile-circle {
        width: 200px;
        height: 200px;
    }
    
    .profile-circle i {
        font-size: 4rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .experience-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .hero-buttons {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .experience-item,
    .skill-category,
    .education-item,
    .reference-card {
        padding: 1.5rem;
    }
    
    .contact-item {
        flex-direction: column;
        text-align: center;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}