/* --- ページ全体 --- */
body {
    background: #111;
    color: #fff;
    font-family: sans-serif;
    margin: 2em;
    font-size: 14px;
}

/* --- 入力系 --- */
input, button, select {
    background: #222;
    color: #fff;
    border: 1px solid #444;
}

/* --- テーブル --- */
table {
    border-collapse: collapse;
    color: #fff;
}

td {
    padding: 0.3em;
}

input[type="text"] {
    width: 6em;
}

/* --- 見出し --- */
.section-title {
    font-weight: bold;
    margin-top: 2em;
    display: block;
}

h1 { margin-bottom: 2em; }
h2 { margin-bottom: 1em; }
h3 { margin-bottom: 2em; }

/* --- 広告 --- */
.ad-area {
    margin: 2em 0;
    text-align: center;
}

/* --- ポップアップ --- */
.ad-popup {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.ad-popup-content {
    background: #fff;
    color: #000;
    padding: 1em;
    position: relative;
}

.ad-close {
    position: absolute;
    top: 5px;
    right: 10px;
    cursor: pointer;
    font-size: 20px;
}