:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #8b5cf6;
    --dark: #000000;
    --light: #ffffff;
    --gray: #9ca3af;
    --transparent-dark: rgba(0, 0, 0, 0.5);
    --transparent-light: rgba(255, 255, 255, 0.1);
    
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--dark);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
}

#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
}

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

/* Header */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    background: var(--transparent-dark);
    border-bottom: 1px solid var(--transparent-light);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--light);
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    color: var(--primary);
}

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

.nav-links a {
    color: var(--gray);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

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

.hero-content {
    max-width: 750px;
}

.hero h1 {
    font-size:4.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--light), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--gray);
    margin-bottom: 30px;
}

.cta-button {
    display: inline-block;
    background: var(--transparent-light);
    color: white;
    padding: 12px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: 1px solid var(--transparent-light);
    backdrop-filter: blur(5px);
}

.cta-button:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: translateY(-3px);
}

/* Skills Section */
.skills-section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 70px;
}

.section-title h2 {
    font-size: 2.0rem;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border-radius: 2px;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
}

.category-card {
    background: var(--transparent-dark);
    border: 1px solid var(--transparent-light);
    border-radius: var(--border-radius);
    padding: 30px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
    border-color: var(--primary);
}

.category-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.category-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.skills-list {
    list-style: none;
}

.skills-list li {
    padding: 8px 0;
    position: relative;
    padding-left: 25px;
    color: var(--gray);
}

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



@media screen and (max-width: 400px) {
    .fa-chalkboard-teacher, .fa-database, .fa-laptop-code, .fa-python, .fa-cloud {
        font-size: 2.0rem;
    }

    .skills-list li {
        font-size: 0.9rem;
    }

    .hero p {
        font-size: 0.9rem;
    }
}


/* Footer */
footer {
    background: var(--transparent-dark);
    padding: 60px 0 30px;
    border-top: 1px solid var(--transparent-light);
    backdrop-filter: blur(10px);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--gray);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--light);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--transparent-light);
    color: var(--light);
    transition: var(--transition);
}

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

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--transparent-light);
    color: var(--gray);
    font-size: 0.9rem;
}

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

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.appear {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .nav-links {
        display: none;
    }
}