/* ===== Body ===== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f6f9;
    color: #2c3e50;
}

/* ===== Header ===== */
h1 {
    text-align: center;
    padding: 40px 0 20px 0;
    font-size: 2.5em;
    color: #1abc9c;
}

/* ===== Boxes ===== */
.box {
    background: #ffffff;
    border-radius: 12px;
    padding: 20px;
    margin: 15px auto;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.15);
    transition: transform 0.2s, box-shadow 0.2s;
}

.box a {
    text-decoration: none;
    color: #34495e;
    font-size: 1.2em;
    font-weight: bold;
}

.box:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.25);
}

/* ===== Modules ===== */
.box strong {
    font-size: 1.3em;
    color: #e67e22;
}

.box a {
    margin-right: 12px;
    transition: color 0.2s;
}

.box a:hover {
    color: #1abc9c;
}

/* ===== Subheadings ===== */
h2, h3 {
    text-align: center;
    color: #34495e;
}

h2 {
    margin-top: 30px;
    font-size: 2em;
}

h3 {
    margin-bottom: 20px;
    font-size: 1.5em;
    color: #7f8c8d;
}

/* ===== Back link ===== */
a.back {
    display: inline-block;
    margin: 20px;
    padding: 10px 20px;
    background: #1abc9c;
    color: #fff !important;
    border-radius: 8px;
    font-weight: bold;
    text-decoration: none;
    transition: background 0.3s;
}

a.back:hover {
    background: #16a085;
}

/* ===== Responsive ===== */
@media screen and (max-width: 600px) {
    .box {
        width: 95%;
        padding: 15px;
    }
    h1 {
        font-size: 2em;
        padding: 30px 0 15px 0;
    }
}