/* --- 全体の雰囲気 (ダークモード) --- */
body {
    background-color: #0b0e14; /* ポータルと同じ背景色 */
    color: #ffffff;
    font-family: 'Exo 2', sans-serif, "Helvetica Neue", Arial;
    text-align: center;
    padding: 20px;
    margin: 0;
    /* スマホでのダブルタップズームを防止 */
    touch-action: manipulation;
}

/* --- ホームに戻るリンク --- */
.back-link {
    display: block;
    text-align: left;
    color: #38bdf8;
    text-decoration: none;
    font-weight: bold;
    margin-bottom: 20px;
    transition: 0.3s;
}
.back-link:hover {
    text-shadow: 0 0 10px #38bdf8;
}

/* --- タイトル --- */
h1 {
    font-size: 2rem;
    text-shadow: 0 0 15px #38bdf8;
    margin-bottom: 30px;
}

/* --- 入力エリア --- */
#login-area, .search-box {
    margin: 20px auto;
    padding: 20px;
    background: #161b22;
    border-radius: 12px;
    border: 1px solid #30363d;
    max-width: 400px;
}

input {
    padding: 12px;
    font-size: 16px;
    background: #0b0e14;
    border: 1px solid #38bdf8;
    border-radius: 8px;
    color: white;
    width: 80%;
    margin-bottom: 15px;
}

/* --- ボタンのデザイン (ネオン風) --- */
button {
    padding: 12px 25px;
    font-size: 18px;
    cursor: pointer;
    background: #38bdf8;
    color: #0b0e14;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    transition: 0.3s ease;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
}

button:hover {
    background: #ffffff;
    box-shadow: 0 0 25px rgba(56, 189, 248, 0.6);
    transform: translateY(-2px);
}

button:disabled {
    background: #334155;
    color: #94a3b8;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

/* --- 連打ボタン (ゲーム中) --- */
#tap-btn {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    font-size: 24px;
    margin: 30px 0;
    border: 4px solid #38bdf8;
    background: transparent;
    color: #38bdf8;
    -webkit-user-select: none;
    user-select: none;
}

#tap-btn:active {
    transform: scale(0.9) !important;
    background: #38bdf8;
    color: #0b0e14;
}

/* --- スコアボード (ランキング) --- */
#score-board {
    margin: 40px auto;
    text-align: left;
    background: #161b22;
    padding: 20px;
    border-radius: 15px;
    border: 1px solid #30363d;
    max-width: 400px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

#score-board h3 {
    border-bottom: 2px solid #38bdf8;
    padding-bottom: 10px;
    margin-top: 0;
}

#ranking-list {
    list-style: none;
    padding: 0;
}

#ranking-list li {
    padding: 12px 0;
    border-bottom: 1px solid #30363d;
    display: flex;
    justify-content: space-between;
}

/* 検索結果の文字色 */
#search-result {
    margin-top: 10px;
    font-weight: bold;
}