:root {
    --background-color: #f0f2f5;
    --container-color: #ffffff;
    --text-color: #1c1e21;
    --button-bg-color: #007bff;
    --button-text-color: #ffffff;
    --button-hover-bg-color: #0056b3;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

.container {
    max-width: 680px;
    width: 100%;
    text-align: center;
}

header {
    margin-bottom: 30px;
}

.profile-picture {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 0 5px 0;
}

p {
    font-size: 1rem;
    color: #606770;
}

main {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.link-button {
    background-color: var(--container-color);
    color: var(--text-color);
    border: 2px solid var(--button-bg-color);
    padding: 15px 20px;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.link-button:hover {
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.1);
}

footer {
    margin-top: 40px;
    font-size: 0.8rem;
    color: #8a8d91;
}