:root {
    --bg: #0d0d0d;
    --card: #1a1a1a;
    --red: #ff4d4d;
    --text: #ffffff;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Arial', sans-serif;
    margin: 0;
}

nav {
    background: #000;
    padding: 15px;
    display: flex;
    justify-content: center;
    gap: 15px;
    position: sticky;
    top: 0;
    border-bottom: 2px solid var(--red);
    flex-wrap: wrap;
}

nav a {
    color: #888;
    text-decoration: none;
    font-weight: bold;
    text-transform: uppercase;
    font-size: 12px;
}

nav a:hover, nav a.active {
    color: var(--red);
}

.container {
    max-width: 800px;
    margin: 50px auto;
    padding: 20px;
}

h1 { border-left: 4px solid var(--red); padding-left: 15px; }

.card {
    background: var(--card);
    padding: 25px;
    border-radius: 10px;
    margin-top: 20px;
}

.btn {
    display: inline-block;
    background: var(--red);
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 10px;
}