:root {
    --bg-color: #f4f4f9;
    --text-color: #333;
    --card-bg: #ffffff;
    --accent-color: #2c3e50;
    --link-color: #3498db;
    --border-radius: 8px;
    --shadow: 0 2px 5px rgba(0,0,0,0.05);
    --avatar-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0d0d0e;
        --text-color: #d1d1d1;
        --card-bg: #1a1a1b;
        --accent-color: #ecf0f1;
        --link-color: #5dade2;
        --shadow: 0 4px 15px rgba(0,0,0,0.4);
        --avatar-shadow: 0 4px 10px rgba(0,0,0,0.3);
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
}

.container {
    max-width: 700px;
    width: 100%;
}

.profile-header {
    text-align: center;
    margin-bottom: 3rem;
}

.avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--card-bg);
    box-shadow: var(--avatar-shadow);
    margin-bottom: 1rem;
}

h1 { margin: 0; font-size: 2rem; color: var(--accent-color); }
.subtitle { margin: 0; font-size: 1.1rem; opacity: 0.7; }

.card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

h2 {
    margin-top: 0;
    font-size: 1.25rem;
    border-bottom: 2px solid var(--bg-color);
    padding-bottom: 0.5rem;
    color: var(--accent-color);
}

.link-grid {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover { text-decoration: underline; }