:root {
    --primary-blue: #007bff;
    --dark-bg: #1a1a1a;
    --darker-bg: #0d1117;
    --card-bg: #21262d;
    --text-light: #c9d1d9;
    --border-color: #30363d;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Navigation */
.navbar {
    background-color: var(--darker-bg) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.navbar-brand {
    font-weight: bold;
    font-size: 1.5rem;
    color: var(--primary-blue) !important;
}

.nav-link {
    color: var(--text-light) !important;
    font-weight: 500;
    transition: color 0.3s ease;
    margin: 0 10px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-blue) !important;
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
    padding-top: 100px;
}

.hero-section h1 {
    background: linear-gradient(45deg, #007bff, #0056b3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.skill-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
}

.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 123, 255, 0.2);
}

/* About Section */
.about-section {
    padding-top: 100px;
    min-height: 80vh;
}

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

.experience-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
    height: 100%;
}

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

/* Portfolio Section */
.portfolio-section {
    padding-top: 100px;
}

.portfolio-card {
    position: relative;
    overflow: hidden;
    border-radius: 15px;
    transition: transform 0.3s ease;
    background-color: var(--card-bg);
}

.portfolio-card:hover {
    transform: scale(1.05);
}

.portfolio-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.9), rgba(0, 86, 179, 0.9));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.portfolio-card:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-content {
    text-align: center;
    padding: 20px;
}

/* Contact Section */
.contact-section {
    padding-top: 100px;
}

.contact-form-wrapper {
    background-color: var(--card-bg);
    border-radius: 15px;
    border: 1px solid var(--border-color);
}

.form-control {
    background-color: var(--darker-bg);
    border: 1px solid var(--border-color);
    color: var(--text-light);
    padding: 12px;
}

.form-control:focus {
    background-color: var(--darker-bg);
    border-color: var(--primary-blue);
    color: var(--text-light);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.contact-info-section {
    background-color: var(--darker-bg);
}

.contact-info-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
    height: 100%;
}

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

/* Buttons */
.btn-primary {
    background: linear-gradient(45deg, #007bff, #0056b3);
    border: none;
    padding: 12px 30px;
    font-weight: 600;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: linear-gradient(45deg, #0056b3, #004085);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 123, 255, 0.3);
}

.btn-outline-light {
    border: 2px solid var(--text-light);
    color: var(--text-light);
    padding: 12px 30px;
    font-weight: 600;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.btn-outline-light:hover {
    background-color: var(--text-light);
    color: var(--dark-bg);
    transform: translateY(-2px);
}

/* Footer */
footer {
    background-color: var(--darker-bg) !important;
    border-top: 1px solid var(--border-color);
}

.social-links a {
    transition: transform 0.3s ease;
}

.social-links a:hover {
    transform: scale(1.2);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        text-align: center;
        padding-top: 120px;
    }
    
    .hero-section .row {
        flex-direction: column-reverse;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
    
    .navbar-nav {
        text-align: center;
        padding-top: 20px;
    }
    
    .nav-link {
        margin: 10px 0;
    }
    
    .portfolio-card {
        margin-bottom: 30px;
    }
}

@media (max-width: 576px) {
    .display-4 {
        font-size: 2rem;
    }
    
    .display-5 {
        font-size: 2rem;
    }
    
    .btn-lg {
        padding: 10px 25px;
        font-size: 1rem;
    }
    
    .hero-section {
        padding-top: 100px;
    }
}

/* Smooth animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.skill-card,
.experience-card,
.contact-info-card {
    animation: fadeInUp 0.6s ease-out;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--darker-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #0056b3;
}