/* 認証オーバーレイ */
.auth-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

.auth-box {
    background-color: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    text-align: center;
    max-width: 400px;
    width: 90%;
    border: 1px solid #eee;
}

.auth-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.auth-box h2 {
    margin-bottom: 15px;
    color: var(--text-color);
    font-size: 24px;
}

.auth-box p {
    margin-bottom: 30px;
    color: var(--text-light);
    line-height: 1.6;
}

.auth-note {
    margin-top: 20px !important;
    margin-bottom: 0 !important;
    font-size: 12px;
    color: var(--text-muted) !important;
}

#google-signin-button {
    display: flex;
    justify-content: center;
    margin: 0 auto;
}