:root {
    --sidebar-bg: #1a1a1a;
    --main-bg: #f0f2f5;
    --text-light: #e0e0e0;
    --text-dark: #333;
    --primary-color: #007bff;
    --card-bg: #ffffff;
    --shadow: 0 4px 8px rgba(0,0,0,0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    display: flex;
    background-color: var(--main-bg);
    color: var(--text-dark);
}

.sidebar {
    width: 280px;
    background-color: var(--sidebar-bg);
    color: var(--text-light);
    position: fixed;
    height: 100%;
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.profile-pic {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 3px solid var(--primary-color);
}

.sidebar h3 {
    color: #fff;
    margin-top: 15px;
    margin-bottom: 5px;
}

.sidebar .nav-link {
    color: var(--text-light);
    margin: 10px 0;
    font-size: 1.1rem;
    transition: color 0.3s;
}

.sidebar .nav-link i {
    margin-right: 15px;
    width: 20px;
    text-align: center;
}

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

.social-icons {
    margin-top: auto;
    text-align: center;
}

.social-icons a {
    color: var(--text-light);
    margin: 0 10px;
    font-size: 1.2rem;
    transition: color 0.3s;
}

.social-icons a:hover {
    color: var(--primary-color);
}

.main-content {
    margin-left: 280px;
    padding: 40px;
    width: calc(100% - 280px);
}

.content-section {
    padding: 60px 0;
    border-bottom: 1px solid #ddd;
}

.hero-section {
    text-align: center;
    padding: 100px 0;
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: 700;
}

.hero-section p {
    font-size: 1.2rem;
    color: #666;
}

h2 {
    font-weight: 700;
    margin-bottom: 40px;
    text-align: center;
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
}

.card {
    border: none;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    background-color: var(--card-bg);
    text-align: center;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.card .card-body {
    padding: 30px;
}

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

.project-card img {
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
}

.form-control {
    border-radius: 5px;
    padding: 12px;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 50px;
    padding: 12px 30px;
    font-weight: 600;
    transition: background-color 0.3s;
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

footer {
    padding: 20px 0;
    color: #777;
}

/* Responsive */
@media (max-width: 992px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        flex-direction: row;
        justify-content: space-between;
        padding: 15px;
    }

    .sidebar .profile-pic {
        width: 60px;
        height: 60px;
    }
    
    .sidebar h3, .sidebar .text-muted {
        display: none;
    }

    .sidebar .nav {
        flex-direction: row;
    }

    .sidebar .nav-link {
        margin: 0 5px;
        font-size: 1rem;
    }
    
    .sidebar .nav-link i {
        margin-right: 5px;
    }

    .social-icons {
        margin-top: 0;
    }

    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 20px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        flex-direction: column;
        align-items: center;
    }
    .sidebar .nav {
        margin-top: 15px;
    }
}