body {
    background: linear-gradient(120deg, #e0e7ff 0%, #f8fafc 100%);
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    color: #222;
}

.header-nav {
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

header {
    background-color: #f8f9fa;
    padding: 24px 0 24px 0;
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 1px;
    border-bottom: 2px solid #e0e0e0;
    position: relative;
    margin-bottom: 5%;
}

header a {
    display: inline-block;
    margin: 0 18px;
    font-size: 1.1rem;
    color: #0077ff;
    text-decoration: none;
    font-weight: 500;
    border-radius: 8px;
    padding: 6px 14px;
    transition: background 0.2s, color 0.2s;
}

header a:hover {
    background: #0077ff;
    color: #fff;
}

.portfolio-card {
    background: #fff;
    box-shadow: 0 4px 24px rgba(0,0,0,0.10);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    margin-top: 200px;
    max-width: 370px;
    transition: box-shadow 0.2s;
}

.portfolio-card:hover {
    box-shadow: 0 8px 32px rgba(0,0,0,0.14);
}

.portfolio-card h2 {
    font-size: 1.6rem;
    color: #222;
}

.portfolio-card h4 {
    color: #0077ff;
    font-weight: 500;
    margin-bottom: 1rem;
}

.portfolio-card p {
    color: #444;
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
}

.portfolio-card button {
    padding: 0.6rem 2rem;
    border: none;
    border-radius: 22px;
    background: linear-gradient(90deg, #0077ff 60%, #00c6ff 100%);
    color: #fff;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    margin-bottom: 1rem;
    box-shadow: 0 2px 8px rgba(0,119,255,0.08);
    transition: background 0.2s, transform 0.2s;
}

.portfolio-card button:hover {
    background: linear-gradient(90deg, #005bb5 60%, #0099cc 100%);
    transform: scale(1.05);
}

.portfolio-card div {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 16px;
}

.portfolio-card a img {
    filter: grayscale(40%);
    transition: filter 0.2s, transform 0.2s;
    vertical-align: middle;
}

.portfolio-card a:hover img {
    filter: none;
    transform: scale(1.15);
}

.portfolio-card a {
    background: #f0f4ff;
    border-radius: 50%;
    padding: 8px;
    transition: background 0.2s;
    display: inline-block;
}

.portfolio-card a:hover {
    background: #e0e7ff;
}