/* Deep Blue & Slate Theme */
body {
    background-color: #0f172a;
    color: #f8fafc;
    font-family: Arial, sans-serif;
    margin: 0;
    line-height: 1.6;
}

.hero-image {
    width: 100%;
    max-width: 1200px;
    display: block;
    margin: 0 auto;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

h1, h2, h3 {
    color: #38bdf8; /* Sky Blue accent */
}

.card {
    background: #1e293b;
    padding: 25px;
    border-radius: 12px;
    border: 1px solid #334155;
    margin-top: 30px;
}

button {
    background-color: #38bdf8;
    color: #0f172a;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background-color: #0ea5e9;
}

.hidden {
    display: none;
    margin-top: 20px;
    background: #0f172a;
    padding: 20px;
    border-radius: 8px;
}