:root {
    --primary-color: #0a192f;
    --secondary-color: #112240;
    --text-primary: #ccd6f6;
    --text-secondary: #8892b0;
    --accent-color: #64ffda;
    --white: #ffffff;
    --font-main: 'Inter', sans-serif;
    --transition: all 0.3s ease-in-out;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--primary-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(10, 25, 47, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

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

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
}

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

.btn-primary {
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 500;
}

.btn-primary:hover {
    background-color: rgba(100, 255, 218, 0.1);
}

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--accent-color);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
}

.subtitle {
    color: var(--accent-color);
    font-family: monospace;
    font-size: 1rem;
    margin-bottom: 1rem;
    display: block;
}

.hero h1 {
    font-size: 4rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero h2 {
    font-size: 3rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero p {
    max-width: 540px;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 500;
}

.btn-secondary:hover {
    background-color: #172a46;
    color: var(--accent-color);
}

/* Sections */
.section {
    padding: 6rem 0;
}

.section-title {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
}

.section-title::after {
    content: "";
    display: block;
    width: 300px;
    height: 1px;
    background-color: var(--secondary-color);
    margin-left: 20px;
}

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

/* About */
.about-content p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 800px;
}

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

.skill-category h3 {
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

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

.tags span {
    background-color: var(--primary-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.9rem;
    border: 1px solid #233554;
    transition: var(--transition);
}

.tags span:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

/* Experience */
.timeline {
    position: relative;
    max-width: 800px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background-color: var(--secondary-color);
}

.timeline-item {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 3rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--accent-color);
}

.timeline-date {
    font-family: monospace;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
}

.timeline-content h4 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.location {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 1rem;
}

.timeline-content ul {
    list-style-type: disc;
    padding-left: 1.5rem;
}

.timeline-content li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

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

.edu-card {
    background-color: var(--primary-color);
    padding: 2rem;
    border-radius: 4px;
    transition: var(--transition);
}

.edu-card:hover {
    transform: translateY(-5px);
}

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

.edu-card h4 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.edu-card .date {
    font-family: monospace;
    color: var(--text-secondary);
}

.certifications-list h3 {
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.certifications-list ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.certifications-list li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.certifications-list li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

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

.contact-info {
    margin-bottom: 3rem;
}

.contact-info h3 {
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    font-family: monospace;
}

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

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

.copyright {
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-family: monospace;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 70%;
        background-color: var(--secondary-color);
        flex-direction: column;
        justify-content: center;
        transition: var(--transition);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
    }

    .nav-links.active {
        right: 0;
    }

    .hamburger {
        display: block;
        z-index: 1001;
    }

    .section-title::after {
        width: 100px;
    }
}

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

.project-card {
    background-color: var(--secondary-color);
    padding: 2rem;
    border-radius: 4px;
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.project-card:hover {
    transform: translateY(-5px);
}

.project-card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.project-link {
    color: var(--accent-color);
    font-family: monospace;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.project-link:hover {
    text-decoration: underline;
}