* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

body {
    background: #f0f2f5;
    color: #222;
}

header {
    background: #1a1a2e;
    color: white;
    text-align: center;
    padding: 1.5rem 1rem;
}

header h1 {
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 6px;
}

header p {
    font-size: 14px;
    color: #aab4c8;
}

nav {
    background: white;
    padding: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    border-bottom: 1px solid #ddd;
}

button {
    background: #1a1a2e;
    color: white;
    border: none;
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: #2d2d6b;
}

main {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}