body {
    margin: 0;
    font-family: system-ui, sans-serif;
    background: #f3f4f6;
    color: #333;
}
header {
    background: #111827;
    padding: 12px 16px; /* 少しパディングを調整 */
    color: #fff;
}
header h1 {
    margin: 0;
    font-size: 18px;
    font-weight: bold;
    display: flex;
    align-items: center;
}

/* ナビゲーション全体のレイアウト */
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 10px;
}

/* --- 内部ツール用 (シンプル・テキストリンク) --- */
.nav-group-internal {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
}
.nav-link-simple {
    color: #9ca3af; /* 薄いグレー */
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
}
.nav-link-simple:hover, .nav-link-simple:focus {
    color: #fff; /* ホバー時は白 */
}
.nav-link-simple i {
    margin-right: 4px;
}

/* --- FANZAツール用 (強調・ボタン) --- */
.nav-group-revenue {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
/* 共通ボタン形状 */
.nav-btn {
    padding: 5px 10px;
    border-radius: 4px;
    text-decoration: none;
    font-size: 12px;
    font-weight: bold;
    display: flex;
    align-items: center;
    transition: transform 0.1s, opacity 0.2s;
}
.nav-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}
.btn-price { background: #dc3545; color: #fff; } /* 赤 */
.btn-gacha { background: #ffc107; color: #000; } /* 黄 */
.btn-search { background: #212529; color: #fff; border: 1px solid #495057; } /* 黒 */

main {
    max-width: 100%;
    margin: 24px auto;
    padding: 0 14px;
}
.base-card {
    background: #fff;
    padding: 20px;
    border-radius: 14px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.ad-slot {
    margin: 16px 0;
    text-align: center;
}
footer {
    text-align: center;
    padding: 24px;
    font-size: 12px;
    color: #6b7280;
}
a { text-decoration: none; }